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eclipsh

15+ Year Contributor
1,606
58
Jun 16, 2005
Durango, Colorado
I'm rebuilding my 2.4 and want to make sure I'm putting the right parts in for my target. I'm looking at ~450-500 HP as a goal. I have a 4G64 bottom end and 2g head. I've got Wiseco "9:1" pistons I'm reusing with new rings. Head has BC valve springs, a 3 angle valve job, ARP head studs. I've got 780 CC injectors and an Evo 9 pump.

I'm looking at running Eagle rods, 272 cams. I'm not sure what head gasket I should run or if the valve springs can handle 272 cams at a 7k RPM rev limit. I'm also not sure if the Eagle rods can handle 500 HP on a 2.4 given the rod ratio.

My other concern is the thrust bearing. At 500 HP there aren't a lot of clutch options and I'm concerned the heavy pressure plate will chew up thrust bearings. Any experienced advice on this? I'm thinking of getting a dual clutch system to save the bearings but that is an expensive solution. I have a 95 block so it is the old style thrust bearing.

If it matters, I'm going Holset for the turbo.
 
The BC single springs will handle the smaller 272 cams Like the BC272, HKS272 and the comp/FP.
As long as the springs were installed correctly and have the seat pressure set.

But you will need different springs for Kelford and GSC cams

A good composite has been shown to work at your goal level with out much issue once the tune is set.
 
What's the compressed thickness of the composite gaskets? I haven't had one through the shop here in years. We try to use as thin a gasket as possible to tighten up the quench.

Eagle rods are fine at your power level. Rod ratio isn't as big of a deal as people make it out to be. Just forum fodder.

A dual disc clutch is the best answer for your concerns with the thrust bearing. You're on the money with trying to avoid a high pressure baseplate. A lot of our customers use the Exedy twin with great results. Other big factors to consider are using the right oil and setting the clearances properly.
 
My Felpro composite was .039" compressed.

Choosing the correct oil viscosity is dependent on a number of factors. Looser bearing clearances lower oil pressure and BSE tends to raise it. My mains are .002" and rods are .0025" I personally run 15W40 Rotella. 18psi idle, 50-60 psi cruising and about 80 psi at redline. (give or take 5 psi depending on when I shift) I tried 20w50, but my pressure was too high!
 
Make sure your thrust clearances are 100% correct across all of the thrust bearings. Also I'd get ARP mains and the cap alignment dowels. They make the older style bearings for the early 7 bolt IIRC. Maybe look into that.

And the above is correct regarding side loading, if you're running Eagles+Wiseco you're basically only at 110% side loading compared to OEM at the stock rev limit. So nothing really to write home about.

I'm running a similar setup, except with a revised 7 bolt 2.4 and a 1g head. I'm also on an automatic so there isnt much thrust load.
 
My Felpro composite was .039" compressed.

Choosing the correct oil viscosity is dependent on a number of factors. Looser bearing clearances lower oil pressure and BSE tends to raise it. My mains are .002" and rods are .0025" I personally run 15W40 Rotella. 18psi idle, 50-60 psi cruising and about 80 psi at redline. (give or take 5 psi depending on when I shift) I tried 20w50, but my pressure was too high!
Brad Penn in everything. Break-In formula on new builds and then their regular build from there on. Viscosity depend on clearances, application, etc. We used to use Rotella for break-in purposes but we read in a couple trade publications that the additive package was changed due to new EPA regs and the good stuff was taken out. We don't recommend Rotella anymore. Gibbs is a good alternative, though.
 
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