Valve spring project

[MPFab]

LMK, shipping won't be cheap. I'm skeptical about benefits of porting on a boosted application, but I'm so far out from rebuilding that engine, that it's doing nobody any good sitting on my bench.

Turbo or not has nothing to do with it. A properly ported head on a turbo car will decrease spool up time and make more power everywhere. My Evo reduced spool up by 500rpm going to a CNC'd head and gained almost 40whp with a set small of cams. Once I swapped in a set of big(276dur/12.5mm lift) cams that could take advantage of the porting, I picked up 80whp. Power went from 460whp on 93 octane to 540whp.
Cams plus porting on turbo cars yields huge gains regardless of size of the engine.

Sent from my XT1060 using Tapatalk

 

[MPFab]

I just did a little research on cams... Most 4cyl cams don't gain much of anything, without other major mods. Turbo engines don't gain a ton from cams cause most stock cams on turbo cars are don't pretty well from the factory.

Since our engines are tiny. I don't think much will be gained from raw Hp.

The idea would be to think of what most cams do. They move the power band further out. So if we could shift our 5k peak Hp to 7k these cars would pull for days.

A good write-up https://www.amsperformance.com/resources/technical-articles/58-famous-dsm-camshaft-test

Check this one out. The Evo head is superior to the DSM head and cam development has increased by spades. Even this article is outdated, but one of these set of cams picked up 54whp.

 

[ranvette]

xTooltipElement
Service Information
Related Documents Global Labor Time Guide: Valve Stem Oil Seal and Valve Spring Replacement

2012 Chevrolet Cruze | Cruze US/Canada Service Manual 2817 | Engine | Engine Mechanical - 1.2L L2Q LDC LWD or 1.4L L2I L2N LDD LUH LUJ LUV | Repair Instructions - On Vehicle | Document ID: 2540443
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Valve Stem Oil Seal and Valve Spring Replacement
Special Tools
•207649 Rod Hairpin Clips
•547324 Flange Screws
•EN-958 Installer
•EN-840 Pliers / Remover
•EN-952 Fixing Pin
•EN-50717 Kit
•J-43649–2 Rods
For equivalent regional tools, refer to Special Tools.

Removal Procedure 1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
 2. Remove the right front wheel house liner. Refer to Front Wheelhouse Liner Replacement.
 3. Lower the vehicle.
 4. Remove the hydraulic valve lash adjuster arms. Refer to Hydraulic Valve Lash Adjuster Arm Replacement.
 5. Remove the spark plugs. Refer to Spark Plug Replacement.
 6. Adjust the engine to TDC of cylinder 1 and fix the crankshaft. Refer to Camshaft Timing Chain Adjustment.
Note: Wheels must contact the ground.

 7. Shift to 5. gear (MT) or park position (AT) and apply the park brake.
Valve Stem Oil Seal Removal


 1. Install the 2  EN-50717–1 stands  (1) to the cylinder head and fix them with the 547324 screws .
 2. Install the 2  J-43649-2 rods  (2) and the EN-51717–2 compressor  (3) to the EN-50717–1 stands . Secure the rods with the 207649 clips then.
 3. Install an suitable air pressure adapter (4) to the spark plug hole.
 4. Apply air pressure to the corresponding cylinder.
 5. Position the EN-51717–2 compressor  (3) so that its adapter proper contacts the valve spring retainer and pretension the compressor.



Warning: Valve springs can be tightly compressed. Use care when removing the retainers and plugs. Personal injury could result.

 6. Apply pressure to the EN-50717–2 compressor to push down the vale spring retainer (1) and compress the valve spring (3) until the valve keys (2) are free from tension. Carefully remove the valve keys then.
 7. Release the tension from the EN-50717–2 compressor .
 8. Remove the valve spring retainer (1) and the valve spring (3).


 9. Remove and DISCARD the valve stem oil seal (2), using the EN-840 pliers  (1).
Valve Stem Oil Seal Installation


Note: Lubricate the NEW valve stem oil seal with clean engine oil.

 1. Install the NEW valve stem oil seal, using the EN-958 installer  (1).
 2. Loosely install the valve spring and the valve spring retainer.


Caution: The valve stem keys must correctly seat in the valve spring cap. Engine damage may occur by not installing properly.

 3. Using the EN-51717–2 compressor  (4), push down the valve spring retainer (1) and compress the valve spring (3) until the valve keys (2) can be inserted. Carefully insert the valve keys then, so that they are proper installed to the valve stem grooves.
 4. Carefully release the tension from the EN-50717–2 compressor .
 5. Inspect the valve keys and valve spring retainer for proper seat.
 6. Repeat the procedure with the remaining valves and cylinders. Transfer the EN-50717–1 stands and the EN-51717–2 compressor as needed.
 7. Take care that air pressure is always applied to the combustion chamber of the treated cylinder.
Installation Procedure 1. Remove the tools from the cylinder head.
 2. Release the air pressure and remove the air pressure adapter form the spark plug hole.
 3. Shift to neutral gear and release the park brake.
 4. Install the spark plugs. Refer to Spark Plug Replacement.
 5. Install the hydraulic valve lash adjuster arms. Refer to Hydraulic Valve Lash Adjuster Arm Replacement.
 6. Raise the vehicle.
 7. Remove the EN-952 fixing pin and install the crankshaft bearing cap tie plate hole plug. Refer to Camshaft Timing Chain Adjustment.
 8. Install the right front wheelhouse liner. Refer to Front Wheelhouse Liner Replacement.
 9. Lower the vehicle.
© 2014 General Motors. All rights reserved.

 

[ranvette]

xTooltipElement
Service Information
Related Documents Global Labor Time Guide: Hydraulic Valve Lash Adjuster Arm Replacement

2012 Chevrolet Cruze | Cruze US/Canada Service Manual 2817 | Engine | Engine Mechanical - 1.2L L2Q LDC LWD or 1.4L L2I L2N LDD LUH LUJ LUV | Repair Instructions - On Vehicle | Document ID: 2337014
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Hydraulic Valve Lash Adjuster Arm Replacement
Removal Procedure 1. Remove the intake camshaft. Refer to Intake Camshaft Replacement.
 2. Remove the exhaust camshaft. Refer to Exhaust Camshaft Replacement.



Note: Mind the installation position of the hydraulic valve lash adjuster arms.

 3. Remove the 16 hydraulic valve lash adjuster arms (1).
Installation Procedure


Note: Hydraulic valve lash adjuster arms should be installed in their original position

 1. Lubricate the hydraulic valve lash adjuster arms with engine oil.
 2. Install the 16 hydraulic valve lash adjuster arms (1).
 3. Install the exhaust camshaft. Refer to Exhaust Camshaft Replacement.
 4. Install the intake camshaft. Refer to Intake Camshaft Replacement.
© 2014 General Motors. All rights reserved.

 

[ranvette]

xTooltipElement
Service Information
Related Documents Global Labor Time Guide: Exhaust Camshaft Replacement

2012 Chevrolet Cruze | Cruze US/Canada Service Manual 2817 | Engine | Engine Mechanical - 1.2L L2Q LDC LWD or 1.4L L2I L2N LDD LUH LUJ LUV | Repair Instructions - On Vehicle | Document ID: 2337020
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Exhaust Camshaft Replacement
Removal Procedure 1. Remove the camshaft exhaust sprocket. Refer to Camshaft Exhaust Sprocket Replacement.



 2. Remove the camshaft bearing cap bolts in a spiral sequence as shown one turn at a time until there is no spring tension pushing on the camshaft.


Note: Mind the markings on the camshaft bearing caps to ensure they will be installed in the same position.

 3. Remove the 10 camshaft bearing cap bolts (1).
 4. Remove the 5 camshaft bearing caps (2).
 5. Remove the exhaust camshaft (3).
Installation Procedure


Note: Mind the markings on the camshaft bearing caps. Camshaft bearing caps should be installed in their original position.

 1. Lubricate camshaft and camshaft bearing caps with engine oil.
 2. Install the exhaust camshaft (3).
 3. Install the 5 camshaft bearing caps (2).
 4. Install the 10 camshaft bearing cap bolts (1) and handtighten.


Caution: Refer to Fastener Caution.

Note: Tighten the camshaft bearing cap bolts one turn a time to avoid shape distortion of the camshaft.

 5. Tighten the camshaft bearing cap bolts one turn at a time in a spiral sequence as shown to 8 Y (71 lb in).
 6. Install the camshaft exhaust sprocket. Refer to Camshaft Exhaust Sprocket Replacement.
© 2014 General Motors. All rights reserved.

 

[ranvette]

xTooltipElement
Service Information
Related Documents Global Labor Time Guide: Intake Camshaft Replacement

2012 Chevrolet Cruze | Cruze US/Canada Service Manual 2817 | Engine | Engine Mechanical - 1.2L L2Q LDC LWD or 1.4L L2I L2N LDD LUH LUJ LUV | Repair Instructions - On Vehicle | Document ID: 2337016
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Intake Camshaft Replacement
Removal Procedure 1. Remove the camshaft intake sprocket. Refer to Camshaft Intake Sprocket Replacement.



 2. Remove the camshaft bearing cap bolts in a spiral sequence as shown one turn at a time until there is no spring tension pushing on the camshaft.


Note: Mind the markings on the camshaft bearing caps to ensure they will be installed in the same position.

 3. Remove the 10 camshaft bearing cap bolts (1).
 4. Remove the 5 camshaft bearing caps (2).
 5. Remove the intake camshaft (3).
Installation Procedure


Note: Mind the markings on the camshaft bearing caps. Camshaft bearing caps should be installed in their original position.

 1. Lubricate camshaft and camshaft bearing caps with engine oil.
 2. Install the intake camshaft (3).
 3. Install the 5 camshaft bearing caps (2).
 4. Install the 10 camshaft bearing cap bolts (1) and handtighten.


Caution: Refer to Fastener Caution.

Note: Tighten the camshaft bearing cap bolts one turn a time to avoid shape distortion of the camshaft.

 5. Tighten the camshaft bearing cap bolts one turn at a time in a spiral sequence as shown to 8 Y (71 lb in).
 6. Install camshaft intake sprocket. Refer to Camshaft Intake Sprocket Replacement.
© 2014 General Motors. All rights reserved.

 

[Preloader]

Excellent info.

The only thing missing is: 1. Remove the camshaft exhaust sprocket. Refer to Camshaft Exhaust Sprocket Replacement.

That part makes me nervous I'm curious to know the procedure for not compromising the VVT positioning.

 

[ranvette]

xTooltipElement
Service Information


2012 Chevrolet Cruze | Cruze US/Canada Service Manual 2817 | Engine | Engine Mechanical - 1.2L L2Q LDC LWD or 1.4L L2I L2N LDD LUH LUJ LUV | Repair Instructions - On Vehicle | Document ID: 2320417
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Camshaft Timing Chain Adjustment
Special Tools
•EN-952 Fixing Pin
•EN-953–A Fixing Tool
•EN-45059 Angle Meter
•EN-49977–100 Fixation Sensor Discs
For equivalent regional tools, refer to Special Tools.

 1. Remove the ignition coil. Refer to Ignition Coil Replacement.
 2. Remove the camshaft cover. Refer to Camshaft Cover Replacement.
 3. Remove the camshaft position actuator solenoid valves. Refer to Camshaft Position Actuator Solenoid Valve Replacement.
 4. Remove the right front wheelhouse liner. Refer to Front Wheelhouse Liner Replacement.
 5. Remove the front compartment insulator. Refer to Front Compartment Insulator Replacement.



 6. Set the crankshaft balancer in the direction of the engine rotation to “1st cylinder TDC”, for this rotate the engine clockwise until the bore (2) in the crankshaft balancer aligns with the mark (1) on the engine front cover.


 7. Remove the crankshaft bearing cap tie plate hole plug (2) and the seal ring (1).


Caution: To ensure proper crankshaft top dead center (TDC) alignment, the retention pin should fit easily through the bore in the crankshaft tie plate and into the crankshaft. Binding of the retention pin could affect proper engine timing.

 8. Install the EN-952 fixing pin (1) to hold the crankshaft in “1st cylinder TDC” position.



 9. Loosen the intake camshaft sprocket bolt (2) while holding the hexagon of the intake camshaft with a wrench (1) until the camshaft position exciter wheel is clearly rotatable.
10. Loosen the exhaust camshaft sprocket bolt while holding the hexagon of the exhaust camshaft with a wrench until the camshaft position exciter wheel is clearly rotatable.


Note: The fixing tool should be installed completely to both camshaft grooves without high effort.

11. Adjust the camshafts so that the EN-953–A fixing tool (1) can be installed.



12. Remove the 2 upper timing chain guide bolts (1).
13. Remove the upper timing chain guide (2).


Note: Push the fixing tool in the direction of the arrow to ensure it engages without clearance.

14. Install the EN-49977–200 fixing tool (2) and adjust the gearing of the fixing tool so it engages with the intake camshaft sprocket gearing (1).



15. Tighten the 2 fastening bolts (1) of the EN-49977–200 fixing tool while pushing the fixing tool in direction of the arrow.
16. Tighten the adjuster bolt (2).


Note: A wrong installation position is possible. Make sure that the fixation tool is installed without clearance to the cylinder head in areas (3) and (5).

17. Install the EN-49977–100 fixation (2) to find and hold the camshaft position exciter wheels in the correct position.
18. Tighten the 2 fastening bolts (6) of the EN-49977–100 fixation.
Caution: Refer to Fastener Caution.

Caution: Refer to Torque-to-Yield Fastener Caution.

19. Tighten the intake camshaft sprocket bolt (4) while holding the hexagon (1) of the intake camshaft a first pass to 50 Y (37 lb ft).
20. Tighten the intake camshaft sprocket bolt (4) while holding the hexagon (1) of the intake camshaft a final pass to an additional 60 degrees, using the EN-45059 meter.
Caution: Refer to Torque-to-Yield Fastener Caution.

21. Tighten the exhaust camshaft sprocket bolt while holding the hexagon of the exhaust camshaft a first pass to 50 Y (37 lb ft).
22. Tighten the exhaust camshaft sprocket bolt while holding the hexagon of the exhaust camshaft a final pass to an additional 60 degrees, using the EN-45059 meter.
23. Remove the EN-49977–100 fixation and the EN-49977–200 fixing tool.



24. Install the upper timing chain guide (2).
25. Install the 2 upper timing chain guide bolts (1) and tighten to 8 Y (71 lb in).
26. Remove the EN-953–A fixing tool.
27. Remove the EN-952 fixing pin.
28. Rotate the crankshaft for 720° and check the engine timing again. Repeat the adjustment procedure if necessary.
29. Install the crankshaft bearing cap tie plate hole plug and seal ring and tighten to 40 Y (30 lb ft).
30. Install the front compartment insulator. Refer to Front Compartment Insulator Replacement
31. Install the right front wheelhouse liner. Refer to Front Wheelhouse Liner Replacement
32. Install the camshaft position actuator solenoid valves. Refer to Camshaft Position Actuator Solenoid Valve Replacement.
33. Install the camshaft cover. Refer to Camshaft Cover Replacement.
34. Install the ignition coil. Refer to Ignition Coil Replacement.
© 2014 General Motors. All rights reserved.

 

[ranvette]

xTooltipElement
Service Information
Related Documents Global Labor Time Guide: Camshaft Exhaust Sprocket Replacement

2012 Chevrolet Cruze | Cruze US/Canada Service Manual 2817 | Engine | Engine Mechanical - 1.2L L2Q LDC LWD or 1.4L L2I L2N LDD LUH LUJ LUV | Repair Instructions - On Vehicle | Document ID: 2324089
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Camshaft Exhaust Sprocket Replacement
Special Tool

EN-955–10 Fixing Pin from EN-955 Kit


For equivalent regional tools, refer to Special Tools.

Removal Procedure 1. Open the hood.
 2. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement.
 3. Remove the camshaft cover. Refer to Camshaft Cover Replacement.
 4. Remove the 2 camshaft position actuator solenoid valves. Refer to Camshaft Position Actuator Solenoid Valve Removal.
 5. Adjust the engine to TDC. Refer to Camshaft Timing Chain Inspection.



 6. Remove the timing chain tensioner plug (1) from the engine front cover.


 7. Install a wrench (1) to the hexagon of the intake camshaft and rotate it in direction of the arrow in order to apply tension to the timing chain and hold.


 8. Install the EN-955–10 pin (2) to the timing chain tensioner bore (1) to secure it in place.
 9. Remove the wrench from the intake camshaft.


10. Remove the 2 upper timing chain guide bolts (1).
11. Remove the upper timing chain guide (2).


12. Loosen the intake camshaft sprocket bolt (2) while holding the hexagon of the intake camshaft with a wrench (1).
13. Loosen the exhaust camshaft sprocket bolt while holding the hexagon of the exhaust camshaft with a wrench.


14. Remove the 2 camshaft sprocket bolts (2) and the 2 camshaft position exciter wheels (1).


15. Remove the 2 camshaft sprockets (2) along with the timing chain (1) and place it in the engine front cover.
16. Remove the exhaust camshaft sprocket.
Installation Procedure 1. Insert the exhaust camshaft sprocket to the engine front cover and timing chain.


 2. Install the 2 camshaft sprockets (2) along with the timing chain (1) to the camshafts.


 3. Install the 2 camshaft sprocket bolts (2) and the 2 camshaft position exciter wheels (1).
 4. Remove the EN-955–10 pin to apply tension to the timing chain.
Note: Engine must be adjusted to TDC.

 5. Tighten the 2 camshaft sprockets. Refer to Camshaft Timing Chain Adjustment.
 6. Remove all special tools for timing chain adjustment. Refer to Camshaft Timing Chain Adjustment.



 7. Install the upper timing chain guide (2).
Caution: Refer to Fastener Caution.

 8. Install the 2 upper timing chain guide bolts (1) and tighten to 8 Y (71 lb in).
 9. Install the 2 camshaft position actuator solenoid valves. Refer to Camshaft Position Actuator Solenoid Valve Installation.
10. Install the camshaft cover. Refer to Camshaft Cover Replacement.
11. Install the timing chain tensioner plug and tighten to 50 Y (37 lb ft).
12. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement.
13. Check and correct engine oil level.
14. Close the hood.
© 2014 General Motors. All rights reserved.

 

[jonboys66]

I was talking about the duration at .050 on the cam. 182 is nothing. I know that is just lobe lift. I wonder what the ratio is for the rocker arm. I work at comp cams in the tech department and I have never seen a cam that small. I would hate to know what the stock duration is if that is a performance grind. The 110 lobe center throws me off too.

 

[MPFab]

I was talking about the duration at .050 on the cam. 182 is nothing. I know that is just lobe lift. I wonder what the ratio is for the rocker arm. I work at comp cams in the tech department and I have never seen a cam that small. I would hate to know what the stock duration is if that is a performance grind. The 110 lobe center throws me off too.

Do you have the silver Sonic at Comp? My good friend Brit works there and does the website stuff. He has sent me some pics of your car. He also gave the product development guy a Sonic valve, spring and retainer that Preloader sent me. Unfortunately ya'll passed on doing anything with them.
110deg lobe center works well on DOHC 4 cyl turbo cars. Given that this car has vvt, I'm not sure how much that effects anything.

 

[$ub$onic]

Do you have the silver Sonic at Comp? My good friend Brit works there and does the website stuff. He has sent me some pics of your car. He also gave the product development guy a Sonic valve, spring and retainer that Preloader sent me. Unfortunately ya'll passed on doing anything with them.

110deg lobe center works well on DOHC 4 cyl turbo cars. Given that this car has vvt, I'm not sure how much that effects anything.

I actually just sent Ryan @ comp a email about 1.8 valve train items. Hoping for a positive reply! Haha.

 

[jonboys66]

That would be me. I am still fairly new there and still don't know everyone there. I know the VVT affects lobe center and adjusts it. Webcamshafts probably didn't want to go to big since there isn't a way to limit the VVT and did not want to run into piston to valve clearance issue. I'm just so used to specing out cams for big V8 turbo motors and using anywhere from 112 to 116 lobe center. But they are also running a lot more duration and make more torque.

 

[stealth]

zzp looks like they have valve springs now

Supertech - Supertech Valve Spring Kits #

 

[Sneakerfix]

zzp looks like they have valve springs now

Supertech - Supertech Valve Spring Kits #

Not for the 1.4l that part number is for the Ion

 

[stealth]

I see. just assumed since it was under the cruze sonic tab.

 

[Sneakerfix]

I was wondering if anyone has bought the valve springs or forged pistons from vermont tuning? I would imagine these would both be beneficial for mpfab's turbo kit coming out.
chevrolet cruze tuning sonic chevy | VTunerPerformance - Performance Tuning for Saab, BMW, Chevrolet, Audi

I have the springs but wouldn't buy the pistons yet havent seen issues with them under boost or spray as of yet. but a good head gasket and stud kit will hold off a lot off issues

 

[Preloader]

Yeah, stock head gasket ain't gonna like 28psi. Nor will the stock turbo for that matter.

 

[Swordsmith]

I have the springs but am waiting on a solution to my weird stalling-on-idle-with-AC problem. Have also looked at the spring install and it is beyond the capabilities of not only myself but my local mechanic. I need a good "how to" but I suspect I also need an expert at recent chevy engines (or maybe Saab?)

 

[Dubbs_RS]

Swordsmith, did you ever get the valve springs installed? I see they're up for sale on Vtuners website. Not expensive at all and I am tempted. Any feedback if you have installed them?