Question for Andy @ Livernois

[Dr. Glock]

Has Livernois built a LS2 stroker using the L92 heads/stage 1 L92 cam/L76 intake? In other words has anyone built a L76 (DOD delete) stroker with that configuration. What do you rekon the performance of such a combination would look like when properly tuned?

Thanks for the the info in advance,
Cheers,
Dr. Glock

[Andy@Livernois]

yes we did, it was a little bit ago, so things have evolved since then, but IIRC it made 518 rwhp on 10:1 compression w/ an unported manifold.

[Dr. Glock]

Holy Sh*t! That's a nice number! To what evolution are you referring ?

Cheers,
Dr. Glock

[The Commodore]

how much would something like that cost?

estimated...

[Andy@Livernois]

hmm, I think a longblock would be ~ 8500... if we had to provide everything, but if it was your core engine it would probably drop a grand.

As far as evolution, our heads have improved since then...

[jbradsh1]

Has Livernois built a LS2 stroker using the L92 heads/stage 1 L92 cam/L76 intake? In other words has anyone built a L76 (DOD delete) stroker with that configuration. What do you rekon the performance of such a combination would look like when properly tuned?

Thanks for the the info in advance,
Cheers,
Dr. Glock

What's the difference between a stroker engine and the normal one? I mean is it that one comes in a crate and the other comes in your car when you buy it. But I think that's a crate motor vs a stock motor, isn't it?

[99-LS1-SS]

I feel like a stalker because I keep running across your questions jbradsh1. A stroker motor implies that the stroke of an engine has been increased over stock.

[jbradsh1]

I feel like a stalker because I keep running across your questions jbradsh1. A stroker motor implies that the stroke of an engine has been increased over stock.

I'm pretty new to the car hop up scene but I'm not afraid to ask questions. I try and make them as well thought out as I can but sometimes ... hey, what the hek. So a stroker motor really increases the compression and reduces the displacement a little I take it, if hasn't been bored out or do they usually come with the bore increased some?

[Dr. Glock]

hmm, I think a longblock would be ~ 8500... if we had to provide everything, but if it was your core engine it would probably drop a grand.

As far as evolution, our heads have improved since then...
How about crank and rods only?

[GRRRR8]

I know our pistons are not very good. Most stroker kits will be crank, rods, and pistons.

[99-LS1-SS]

I'm pretty new to the car hop up scene but I'm not afraid to ask questions. I try and make them as well thought out as I can but sometimes ... hey, what the hek. So a stroker motor really increases the compression and reduces the displacement a little I take it, if hasn't been bored out or do they usually come with the bore increased some?

Actually increasing the stroke increases the displacement. The displacement is the volume of all of the cylinders combined.

Read the info on this link and it might give you a little more information.

http://auto.howstuffworks.com/engine1.htm

[Dr. Glock]

I'm pretty new to the car hop up scene but I'm not afraid to ask questions. I try and make them as well thought out as I can but sometimes ... hey, what the hek. So a stroker motor really increases the compression and reduces the displacement a little I take it, if hasn't been bored out or do they usually come with the bore increased some?

A Stroker increases the length of the stroke, the distance that the piston travels inside the bore.
What Is a Stroker?
As its name implies, a stroker is where we increase engine displacement by increasing piston stroke. When we increase stroke, we take the piston deeper in the cylinder bore, which increases displacement. The longer the stroke, the greater the fuel/air charge. Because mechanical advantage or leverage comes with stroke, torque does too. Think of stroke as you would using a breaker bar instead of a ratchet to remove a stubborn bolt. The longer the lever--or stroke--the greater the mechanical advantage

[jbradsh1]

Great explanations! I got it and thanks to all.

[Andy@Livernois]

How about crank and rods only?

a rotating assembly would be ~2400 balanced w/ main bearings, this would be a custom diamond piston because of the L76's smaller bore size compared to an LS2.

a crank would be ~1k
rods are ~650

[Dr. Glock]

Andy,
How much total displacement can we get and still clear everything?

[Andy@Livernois]

You could get right about 400, you maybe could get 410 cid but then you would be using a 4.100 stroke crank which is an unreliable combo... so IMO the max you should consider will be between 400 and 404

[Crazy Paul]

, this would be a custom diamond piston because of the L76's smaller bore size compared to an LS2.


L76 has the same bore size as LS2.
There was one hotrod magazine type article a long time ago which reported the L76 bore size as something smaller than 4.00".......lots of other magazines copied their "tech info". The same original article would have you believe the L76 car engine also has VVT.

http://media.gm.com/us/powertrain/en/product_services/2008/Spec%20Sheet/Gen%20IV/2008%20Gen%20IV%20Car/08_L76.xls
2008 "L76" 6.0L V8 ( L76 )
Bore x stroke:
101.6 x 92mm

[Andy@Livernois]

There are some issues, because it appears the 101.3mm bore size is accurate. We had one L76 specific block and it was definately under the 101.6 number... Also it appears GM can't even get it straight:

http://media.gm.com/us/pontiac/en/product_services/r_cars/r_c_g8/09index.html

then scroll down to engines...

[Crazy Paul]

What's 10 thou between friends.
LOL

It's the same with trying to find the stock cam specs for an LS2. Every GM document you read says something different.

:hang:

[Crazy Paul]

Andy,

I was just looking for Xmas presents for myself and noticed the specs on the L92 Stage 1 have changed.
It's showing on your site now as

http://www.livernoismotorsports.com/downloads/Images/camspecl92stg1.jpg

6 Deg more exhaust duration and 1 deg larger LSA.

What's up with that ?

[Andy@Livernois]

we are working on a new offering for cams, however it got lumped under the wrong section... it is still 224/230 on a 114 lsa...