2.4E to 2.7RS spec

[Reza]

There is a lot to be said for S cams. With well matched gearbox and suitable ratios for purpose, the S cams come on song, sound gnarly, and kick you up the road. even with similar power, an E cammed motor may be as fast or faster, but it aint as magical. It aint as fun. i have both an E cammed and an S cammed motors, both similarly just under 200hp. the E is a 9.1CR 70mm stroke 2.4, and the S is a 66mm short stroke 2.2, both are MFI. the E is a lot more usable?, the S just needs a little more getting used to a specific driving style.

[super9064]

I plan on at some point to build a 73RS replica, at a quarter million for a real one I'm out of the market. My goal for the engine would be an exact duplicate of the factory RS motor. I know I could build a motor that exceeds the power of a RS, or has more torque, but that defeats the purpose. For me, the point would be to have the same driving experience as in a real RS.... for a lot less money.

[xpensivewino]

Porsche realized that external oil cooling was needed on all S cars from 2.2 L on. So to answer the front oil cooler question, I would say it is a must.

[RSTarga]

I second xpensivewino, even while my S was a stock 2.4 it would run hot until I ended up with a 28 tube cooler. The hoop was insufficient. I think that the carrera cooler with fan si the current minimum requirement for anything 2.4 and up.

[silver911]

I think the external oil cooler is a function of location...Not yet run mine long enough or hard enough ( I'm a wuss.. I know) for the oil tmep to reach the upper third of the gauge...
Certainly in a hotter climate an oil cooler would be a good investment.

I hope Rob your RS rep is real beauty...
If gonig that way then do it.. I kept my body work stock... so the engine could be what I wanted...

[Christian Guthrie]

I am currently running a 2.4 with no external coolers. I took a drive yesterday in the 105 plus heat and the temp gauge was just over half way on the gauge. I am following this thread closely as I think a 2.7 would be lots of fun in a swb car. My apologies if I sidetracked the thread. Now, back to our regularly scheduled program.........

[Andy 74]

Ive just had an email from Andial saying the 9.5cr 2.7 p&c (103.928.02) are NLA.

[RSTarga]

J&E make them too, I prefer Mahle but my shop uses a lot of those J&E's in their 911 mods so I guess the quality is pretty good. I'd probably just opt for the stock Mahle's in 8.5 for originalities sake. Good enough for the factory and I've been happy with mine.

[MattB]

What's the latest wisdom on going from a 2.4E to 2.7 or 2.8? I'm doing a top end rebuild on my 2.4E and it looks like I may need new cams, and the (plastic) stacks are likely T versions. Has 2.4S pistons and needs new rings. Not sure yet what space cam I have but the pump has an E part number. So some new bits will needed to get me back to an 2.4E, so why not consider a big bore at the same time?

[Longballa]

What's the latest wisdom on going from a 2.4E to 2.7 or 2.8? I'm doing a top end rebuild on my 2.4E and it looks like I may need new cams, and the (plastic) stacks are likely T versions. Has 2.4S pistons and needs new rings. Not sure yet what space cam I have but the pump has an E part number. So some new bits will needed to get me back to an 2.4E, so why not consider a big bore at the same time?

2.7 RS is a fantastic engine. 2.8L even more fun. 2.8L pistons and cylinders cost more though. I'd go bigger if I was you but people say I'm a bad influence. You're talking about building a 30K engine but will be worth it!