2.4E to 2.7RS spec

[HughH]

The case was machined to accept the 2.7 P+Cs.. along with mods for greater oil flow (I think..)
.

Yes the case needs machining so it is not reversible back to 2.4 and I also had oil flow modifications "while we were there" including a turbo oil pump although i understand the trick upgrade in this area now is a GT3 oil pump

[ChristianS]

Yes the case needs machining so it is not reversible back to 2.4 and I also had oil flow modifications "while we were there" including a turbo oil pump although i understand the trick upgrade in this area now is a GT3 oil pump

I wouldn't put a GT3 oil pump in as this would mean way to much oil pressure, especially for the Mag-engines. Put in a 964 (or the very similar 930) pump and you are done.

Cheers,
Christian

[silver911]

....it is not reversible back to 2.4 a.....

Even if you could go back.... would you?







Really???



I don't think so....

[RSTarga]

I have the 930 pump in mine also, I'm sure one of the newer pumps would be better. The biggest difference for me from the 2.4S spec was the phenomenal torque. I stayed with my S ratios so it's quite quick acceleration. I wonder how much more torque the E would get, you'd save on the heads and throttle bodies.
I sure wish this 9.5 pistons had been readily available when I did my conversion (1982). It sure didn't affect the durability or reliability of the motor. I would never go back.

[Andy 74]

So I'm guessing here but if you leave the E cams in the rev limit stays the the same?

[RSTarga]

If you are upgrading to forged pistons instead of cast (which I believe were stock to the e) and went with some stiffer valve springs you could possibly go higher, but the cams would not produce much at the higher limit.
But I'm not an engine builder please seek professional help.

[silver911]

With the 2.7 torque/power curves the 7100 limit provides a good excuse to use all it...
However it does feel a bit breathless on the track.

For my use of the car the additional 200 rpm would increase my familiarity with the local law enforcement cameras...

[obrut]

If you're buying Mahle P+C's then you may as well buy the 2.8 versions. I have them in my rally car and its a fantastic motor.

Cost difference was negligible when I was buying (via EBS).

I also have the GT3 oil pump and no issues with excessive pressures.

[RSTarga]

I thought the 2.8's used completely different heads, and if we used them with S heads the compression ratio would be above 10.5, then you need twin ignition. I think 2.8 really pushes the mag block just a bit to far.

[Christian Guthrie]

At what point do you need to do external oil coolers? I've heard 2.4 is about the max before going to the front coolers. Any truth to this?