Differences between Corvette ZR1 and Cadillac CTS engines

Vladcanada · 03-07-2008, 12:09 PM

http://www.dpccars.com/car-videos-08...TS-engines.htm

NSTG8R · 03-07-2008, 12:28 PM

cool.

and i'm sure glad they went with 12mm head bolts. those 11.5s just weren't doing the trick.

ZeeOSix · 03-07-2008, 08:49 PM

Here's a longer video with a more complete overview of the ZR1 engine.

http://www.dpccars.com/car-videos-08...e-overview.htm

TTC5Z · 03-10-2008, 05:18 PM

Quote:

Originally Posted by NSTG8R

cool.

and i'm sure glad they went with 12mm head bolts. those 11.5s just weren't doing the trick.

He said 11.0's ... for the older small blocks. Actually, the older bolts are usually good to 600 RWHP levels, on higher compression ratios than LS9 has ... so looks like GM is building in a healthy extra margin of error for new engine.

TrackNoob · 03-10-2008, 07:07 PM

Quote:

Originally Posted by NSTG8R

.

and i'm sure glad they went with 12mm head bolts. those 11.5s just weren't doing the trick.

Hey, with a car generating cylinder pressures needing a "four ply" head gasket, I'll take all the clamping force you can give me.

ZeeOSix · 03-11-2008, 01:42 AM

Quote:

Originally Posted by TTC5Z

He said 11.0's ... for the older small blocks. Actually, the older bolts are usually good to 600 RWHP levels, on higher compression ratios than LS9 has ... so looks like GM is building in a healthy extra margin of error for new engine.

Stating CR without boost pressure level is meaningless.

The higher the boost pressure, the higher the cylinder pressures and the stronger head bolts are required.

Plus GM probably knows guys will be bumping up the boost a day after they get it ... so I'm sure there is some safety margin. Of course, blow it up with a non-factory supercharger pulley and you're warranty is junk too.