66mm crank,90mm pistons Q

[Two Rivers]

If I put a 66mm crank in a 2.7L case with 90mm pistons it should be a 2.5L. Will this work? Going from a 2.2L to a 2.5L will it make a difference that will be noticed. Thinking a E or L cam and 40 webers. Have a 2.2L with T cams and 40 webers now in a 70 targa.

[356RS]

Yes it will work. This is a very popular engine build with a rewarding outcome when done right. What will this engine project be used for? Street or track & street?

[BURN-BROS]

Originally Posted by Two Rivers

If I put a 66mm crank in a 2.7L case with 90mm pistons it should be a 2.5L. Will this work? Going from a 2.2L to a 2.5L will it make a difference that will be noticed. Thinking a E or L cam and 40 webers. Have a 2.2L with T cams and 40 webers now in a 70 targa.

It will work, but it will only be a function of a displacement increase. If I were building an E for the street I would build a 2.7, 2.8, or 2.9.

[Two Rivers]

Street only, restoring the 70 targa stock just looking for a little more power. I don't see the L cam mentioned much. When cruising 90 to 110 the 2.2T seems out of breath.

[kenikh]

Great motor, depending on pistons and cams. RS 90mm Mahle compression is too low on a 66m crank, so you need pistons from JE. The 2.2T is out of breath due to cams, as a 2.2E or S are great motors. E & L cams are theame IIRC. L might be Solex (also nice), but can't recall.

I'd be quite happy with a 9.5:1 CR 2.5L w/ Solex cams and 36mm port heads. This would result in a wicked torquey near-200HP motor with over 7000 RPM power.

[356RS]

Do you have the 70.4mm crank from the 2.7 case? Or is the 66mm crank all you have.
Sense this will be street only and if you have a 70.4mm crank, Aaron's suggestion for a 2.7 would work great especially with the E cams you already have.

[Two Rivers]

Thanks I always thought a short stroke big bore engine would be a nice package.