3.0 or 3.2 Cylinders question.
 

I am about to rebuild a 3.0 ltr SC CIS motor, I suspect I'll find knackered Alusil cylinders.

If I got a good set of Nikasil cylinders from a 3.2 and bought new JE pistons, with 964 cams I'd have a nice motor right?

No issues using 3.2 Cylinders on a 3.0?

Thanks

By the way, newbie!

Ben

The only difference between the 3.0 and 3.2 95mm cylinders is that the 3.0 use the circumferential sealing ring/groove to seal against the head.

The 3.2 (no seal) cylinders can be used with a 3.0 motor with no problems.

Why dont you look into JB R acing's iron lined cylinders. It would open up tons of ring choices, and they are quite the piece of work ( Bling-Bling). They can be found here : www.jbracing.com

Or there is always Ln Engineering's "Nickies" cylinders, and they can be found here: www.lnengineering.com

Hope this helps...

Excellent, thanks.

Ben

Somehow I thought that the difference between a 3.0 and 3.2 was not the cylinders but the length of the rods and throw of the crank.

You are correct, that's why you can use the 3.2 cylinders on the 3.0 engine.

-Andy

Keep in mind that there are 4 different (diameter) tolerance groups for cylinders so you might want investigate what it takes to have your pistons to match your cylinders. I've never mixed and matched pistons and cylinders just 'cause it is such a pain to get everything matched up.
-Chris

we have a good used set of 3.2 Alusil p's and c's over here if you are interested...
pm me back - I'll contact the owner to see if he still has them. I don't know how much he might want.

On a similar topic, say if one wanted to keep the 3.2 pistons. Any issues with this?
I understand the gudgeon pins are a different diameter between 3.0 Vs 3.2
To get around this, would the solution be simply to knock out the small end 3.0 rod bushings, replace and get a machine shop to adjust specifically for the replacement 3.2 gudgeon pins? Does that sound daft? Any obvious issues with that?

IIRC, 3,2 liter rods are narrower than the 3,0 liter because Porsche made the crank throw shoulders wider to retain stiffness when the stroke went from 70,4 mm to 74,4 mm. The wider shoulders meant less bearing area to squeeze the rod onto.

This is exactly what I did. Then slapped a supercharger on top.