3.3 short sroke

[greyes59]

I am planning to build a 3.3 short stroke using;

964 cyl on a 3.0 block and a 3.0 crank

i am looking for somebody who makes spacers between the 964 cylinder and 3.0 block as well as drill the 964 cyl so it fits on the narrow spacing 3.0 block.


Also i realized that i have to modify the 3.0 cooling tins so they can be used on the bigger 964 cylinders

[Henry Schmidt]

We've done this machining and build many times and may still have base shims. It's cost effective but not the most sophisticated solution for a 100mm conversion.

[fred cook]

But, I am using LN slip fit 100mm cylinders and Mahle 10.1:1 pistons. Also have a very nice set of ported Carrera twin plug heads and the Electromotive direct fire ignition kit. Cams are of the 964 variety. Intake chores to be handled by a large port CIS system and exhaust by SSIs. Looking for a nice street engine with a fat torque curve!

[Raceboy]

Originally Posted by fred cook

Intake chores to be handled by a large port CIS system and exhaust by SSIs. Looking for a nice street engine with a fat torque curve!

You mean as for fuel it will be CIS? Come on, this nice engine deserves much better than CIS, I would consider MS2 if budget is an issue. MUCH better driveability and fuel economy than CIS, more power too. On top of that, engine looks less crowded.

[greyes59]

why not MS3 instead of MS2. I heard sequential injection has not advantages at race rpms

[Raceboy]

Originally Posted by greyes59

why not MS3 instead of MS2. I heard sequential injection has not advantages at race rpms

Actually in contrary, at ~3000 rpm upwards there is no difference in sequential injection vs batch. Sequential injection makes biggest difference in idle quality/low rpm/load areas.
But I always connect injectors in sequential (=one injector per driver) and the firing is always sequential though not always timed with cam (when cam sunc sensor is not available). This is with VEMS.