Small Problem at Sandown Raceway

[jimnielsen]

The rods are from Cunningham Rods, the pistons are a modified Wiseco.

[SteveNZ]

Nice, do Wiseco make pistons for these engines? What did you get modified?

[jimnielsen]

Steve, I think that you can buy 'standard' forged wiseco pistons for the alfa/lancia/fiat 16vt engine. In my setup, the rods have been lengthened, the piston pin moved further up the piston and the top surface modified to provide improved combustion characteristics. Each new piston/rod combination (with rings, pins, clips and bolts) weighs 1030 grams - compared to 1325 grams for the original equipment ones.

some more pictures..I wanted to take a few because thats all I'll have of them for a week or so while the block and pistons are at the place that is going to bore the block. Pistons are 84.5mm

[jimnielsen]

last two..

[arjunior45]

so, you are going for higher compression too?

[jimnielsen]

I'm expecting it to be about 9.3:1 - will measure it all up when I have all the pieces back in hand - maybe a week or so..

cheers !~

[arjunior45]

I'm expecting it to be about 9.3:1 - will measure it all up when I have all the pieces back in hand - maybe a week or so..

cheers !~

don't go too high with the boost pressure. Start with oem boost {0,9 - 1,0 bar} first or lower and then be very careful.

[jimnielsen]

Yes, i'll have to be careful with the boost pressure. I am going to be running the car on E85 - that should give us some more 'headroom' as far as boost is concerned. I'll get it running on the hoist on 98 RON ULP then its right over to E85.

[SteveNZ]

That's great stuff. How long are the rods now? The pistons look like they take 4 rings though, weird. I assume they must take only 3 and there is an extra grove there for some reason.

Well it should pull some big revs now, I hope you have a decent turbo for some good top end!

I have a compression ratio calculator (Guy Croft) on excel format. If you are interested I can send you a copy. Just plug in your numbers and see what it works out to be.

[jimnielsen]

that'd be cool. can you please email it to me?

cheers, jim.

[Brul(tm)]

I have a compression ratio calculator (Guy Croft) on excel format. If you are interested I can send you a copy.

I am also interested

Greetings,
Marc

[jimnielsen]

There are only three rings - the other 'slot' is a (sorta) V shaped groove...

[1NRO]

The groove between top and second rings is a "pressure groove" it helps the top ring to behave when gases get past it. The ring end gap is slightly larger on the second ring compared to the first for this reason too.

E85 is as det friendly as it gets with fuel though the higher compression ratio isn't crazy by any means, the Misti's come from the factory with similar CR and they push the CR even higher in high level engines. Jim's been developing a Det fetish so shouldn't have problems.

Seen this gizmo Jim?http://www.zeitronix.com/Products/ECA/ECA.htm


Nik