Can I build a 2.5SS?

[oliverjthomas]

Ok, I've had a look through my storage boxes and here's what I've got:

2.4E complete engine, (now in bits), with MFI. Everything is in good order and the cases are 4R/5R halves.
90mm Mahle cylinders.
90mm Mahle MFI pistons.
66mm non-counterweight crankshaft and rods, from a 'T', if I recall correctly.

I'm aiming to build an engine for my project car and am leaning towards a short-stroke, so I'm thinking of putting the bits together and building a 2.5SS MFI motor. Obviously I'd have the cases shuffle-pinned, etc.

Couple of questions for you:

1 Will the parts go together to build such a motor and will it survive or be a very expensive bang?

2 Would the MFI pump need major alteration?

3 Are the 'E' cams the best option for an engine that will see track work but that still needs to be useable on the road?

All comments gratefully received!

[andrew15]

The T crank will fit and give you a 2.5 short stroke engine, but the 90mm MFI pistons are probably what I call RS Pistons and were only a 8.5:1 compression on the 70.4mm crank - with the 66mm compression is down to about 7.5:1
I know people have built an engine with this combo, but I'm not sure how the low compression worked out.


Specifically,in answer to your questions:
1) As long as you aren't spinning the engine to 7k rpm all day long, the T crank should work fine

2) The pump can probably be recalibrates - which one do you have?

3) E cams would probably be the best with the low compression ratio, but see if you can et a ride with an S-cammed car. I have S cams in my 2.6L SS and it's fine on the street.

I'm sure others will chime in

Regards,
AM