camshafts ... ANYONE???

[theenico]

The VVT is not actually part of the camshaft itself. The actuators just use the oil flow provided by the passage through the cam. Grinding one of our cams is pretty much just like grinding any other cam.

HTH

 

[Dave@ddmworks]

Thanks for dropping in dave! You awnsered some of my suspicions. The blanks you were talking about getting from GM, would they be VVT as well??

Also do you or eric know if the other manufacters doing custom cams would be able to make theirs VVT or is it just a standard cam. I'm guessing non VVT but thought i'd ask

-tyler

The cams that we were talking to them about had the oil passages for the VVT and were regular cam blanks. Like I said in my previous post, getting them is the hard part though.

 

[sx sonic]

Thanks Dave and Theenico for the information! I now have a proper grasp on this

-tyler

 

[Preloader]

What do we have here? For the Vauxhall Corsa 1.6T. These guys are constantly a couple steps ahead of us. Shortshifters, GTX28 turbos, etc.

Anyspray, I'm 90% sure these will be a direct bolt in. I'm not close to this part of the build yet, so I'm not gonna do the legwork right now.

But you can:

Corsa VXR Performance Camshafts | WG Motorworks

 

[firstorbit84]

Omg. I wish Chevy would just release a sonic ss with the 1.6t, so we can all go trade in our cars.

 

[Preloader]

As I processed and dug deeper, I don't believe these will work on the Family 0 1.4.

But more likely to work on the 1.8.

Gonna move forward with re-grinds. Taking mine to the machine shop tomorrow. It's time to get things moving again.

 

[davecerv]

Omg. I wish Chevy would just release a sonic ss with the 1.6t, so we can all go trade in our cars.

YESSS omg I think about that everyday...sighh

 

[MPFab]

I really think all of you screaming for cams are putting the "cart before the horse" here. Until there is another turbo option, adding cams is not going to do much of anything for these engines. The stock turbo is the main hurdle to overcome. You can easily max out the GT14 that comes on these cars with stock camshafts...

 

[laborsmith]

Peobably why Pre is upgrading the turbo first.

Laborsmith

 

[Preloader]

Turbo. Then Cams/springs, bottom end.

MPFab is right. But depending how big of turbo is added, the cams may soon become a bigger problem than just preventing more power.

The VXR and Corsa guys are putting 28 and 30 series turbos on there stock cammed engines, and aren't able to spool til close to the rev limits. Then when they add just a bit more lift and duration cams, that same turbo starts wheeling at a semi appropriate 4k RPM.

So if someone here has definite plans to go big turbo, it wouldn't hurt for them to get the ball rolling on what they're going to do about cams.

Now, if someone is gonna go with a gt20, gt22 or a k03, the stock cams "should" provide them with enough support to enjoy the all around added power of the better flowing turbo.

I do agree that chasing camshafts is a little rambunctious without plans for a bigger turbo.

I will try to get the cams/springs to the machine shop today, and maybe he can give me a little more detail on what kind of performance limitations they have.

 

[Preloader]

Some info from a Cruze member that had his cams done:


IF MECH SET LASH .008 IN/.010 EX
Intake
Exhaust
Valve Lash (Inch):
hyd"
hyd"
Valve Lift (Inch):
0.307
0.307
Valve Lift (mm):
7.8
7.8
Advertised Duration:
208°
208°
Duration @ 0.050":
182°
182°
Lobe Center:
110°
110°

Intake
Opens
-19°
Before
TDC
Exhaust
Opens
21°
Before
BDC
Intake
Closes
21°
After
BDC
Exhaust
Closes
-19°
After
TDC

 

[sx sonic]

What kind of power band was he targeting with that cam selection?

 

[Preloader]

No clue. I don't know if he has a clue. He says he had a shop do his valve springs, pistons, and cams. Getting any info beyond that seems like a chore.

But he did give the cam profile info, so at least it's something.

 

[sx sonic]

Indeed It's a start. The foots in the door.

That said I'd be leary using a came spec'd on an unknown. It's pretty common for people to spec an overly aggressive cam in the hopes of huge power and ending up with a suboptimal setup that left alot on the table in terms of drivability and low to mid power.

In this case even what turbo is used can shift the ideal cam spec a fair bit.

 

[Preloader]

When work slows down I'm taking my cams to Jim Dour at Megacycle. He is the "local" regrind master. Finding regrinders isn't easy.

I'm worried that the boost threshold will be in the high 4ks with the GT25. Higher cams should bring that back into the high 3ks. :fingerscrossed: