vvt
Thread Starter
Teching In
Joined: Jun 2005
Posts: 11
Likes: 0
vvt do any of you see the vvt option being put on the lsx engines...i know the l92 has it but..that motor's not on any of gm performance cars....just want to know what you guys think about this....vvt can be a good performance tool
he means the Variable Valve Timing found on the L92 motors. The thing about that is, as of now, the ONLY cam which is compatible with that is the stock cam. If someone wants to market an aftermarket single bolt cam which is compatible, there might be an additional option.
I read some more about it today. The new L99 in the Camaro will have it, and some trucks as of right now. IMO if and when the time comes you can run a aftermarket cam with high lift and long duration mr valve will meet mr. piston. GM already runs a smaller cam in the VVT motors and designs the pistons with reliefs just in case.
he means the Variable Valve Timing found on the L92 motors. The thing about that is, as of now, the ONLY cam which is compatible with that is the stock cam. If someone wants to market an aftermarket single bolt cam which is compatible, there might be an additional option.
To see it full size : http://image69.webshots.com/669/8/87...5IkMIMx_fs.jpg
FormerVendor
Joined: Mar 2007
Posts: 182
Likes: 0
From: Nacogdoches, TX
We've been doing these for a couple of years now.
http://www.mastmotorsports.com/page....Camshaft&id=30
http://www.mastmotorsports.com/page....Camshaft&id=30
I realized my link isnt working. So heres a closeup with specs.
Mast Motorsports:, What are your specs? How do you keep the valves from hitting the pistons?
(Click to enlarge)
Mast Motorsports:, What are your specs? How do you keep the valves from hitting the pistons?
(Click to enlarge)
Last edited by SweetS10V8; Nov 19, 2008 at 06:35 AM.
Trending Topics
Look in the new comp cams catalog and see the limiter they make for VVT cams. It limits the amount of travel of the cam shaft, so it allows some varible timing but not the full amount.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0
Brett Foote
10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever
Verdad Gallardo
FormerVendor
Joined: Mar 2007
Posts: 182
Likes: 0
From: Nacogdoches, TX
We have a few different options, but one of our most popular is our L92 HO cam. It's .57X/.59X, 22X/23X @ 0.050, 115 LSA. This is the same cam that is in our L92 HO shop truck. This cam will make 530-540 at the crank when used in a stock L92.
I can see why a mechanical limiter would be wanted for a guy that cant change the amount of VVT commanded via the computer, But we have full control of it all, So is that still really needed? As long as the tuner understands what his boundries are, Then there should be no issues of ptv problems. Messing with Cams with VVT also makes it nice on the ecms to adjust your VE for each type of cam movement. It is kind of annoying at first having to set up 2 different ve tables, but it makes for a VERY smooth running car when it is all done.
You can benefit in a drag car also if you REALLY want to. IF you are in control of the cam timing vs RPM in which you are, You can make it follow the optimum movements all the way thru each gear.
FormerVendor
Joined: Mar 2007
Posts: 182
Likes: 0
From: Nacogdoches, TX
A phaser limiter should not really be required if the cam is designed correctly. As far as drag cars go, we have a 2000 T/A with our L92 SS crate engine running 10.99s in the quarter. This engine is basically a stock L92 with a cam/springs swap. We took advantage of the VVT's broader torque curve to allow us to run a lower stall than we could with a fixed cam and still get these kind of numbers.
Last edited by MastMotorsports; Nov 19, 2008 at 01:50 PM. Reason: Added content
We've been doing these for a couple of years now.
http://www.mastmotorsports.com/page....Camshaft&id=30
http://www.mastmotorsports.com/page....Camshaft&id=30
Oops!! I stand corrected!
Staging Lane
Joined: Jul 2008
Posts: 82
Likes: 0
Lets hope GM doesn't go to the gutter because the american economy is in shambles. Trade deficit anyone?
Well hopefully GM will start using this in more engines!