Gains from going 3.0 to 3.2 but still on CIS?

[ebmbiker]

Good day folks,

My '83 SC 3.0 engine [US spec] is being rebuilt at the moment and the guy doing the work says the barrels and pistons are ovalized and need replacing.

I could replace with Euro-spec standard 3.0 or opt for the Mahle 3.2 kit. I already have a backdated exhaust but will be sticking with CIS.

What gains can I expect from going with the 3.2 kit?

Cheers,

JB

[Litle brother]

Hi.
If you go with Mahle 98mm 10.3:1 cr p/c, 964 cams and euro spec fueldistributor togheter with your back dated exhaust you should be able to get 220-230ps.
It will be a good and snappy 3.2 short stroke engine with lots of torque and a super midrange.


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[ebmbiker]

Originally Posted by Litle brother

Hi.
If you go with Mahle 98mm 10.3:1 cr p/c, 964 cams and euro spec fueldistributor togheter with your back dated exhaust you should be able to get 220-230ps.
It will be a good and snappy 3.2 short stroke engine with lots of torque and a super midrange.


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Cheers Litle brother, that sounds like some good gains.

[Dpmulvan]

Originally Posted by ebmbiker

Cheers Litle brother, that sounds like some good gains.

3.2 cylinders and pistons are cheaper than 3.0 so an added bonus

[flightlead404]

you might consider going with frankencis to manage the mixture and ignition to get even more out of it.

[Trackrash]

Have you also considered going to the larger '78-'79 / Euro CIS?

[Litle brother]

Originally Posted by Dpmulvan

3.2 cylinders and pistons are cheaper than 3.0 so an added bonus

Here's the p/c kit that will be the best choice:

https://www.fvd.net/no-en/10010303200/mahle-32-l-piston-and-cylinder-set-1031-98-mm-big-bore-for-911-30-l.html


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[Nux]

Why not go for a 3.3 with p/c from LN Engineering?

Cheaper than FVD and 3% bigger bore = 3% more power (isch)