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2.5 Litre Pistons

Posted: Wed Feb 28, 2007 5:11 am
by IAN TT
I am building a 2.5 litre full house performance motor for motorsport. I want to fit high compression pistons but the motor must run on pump fuel (98 ron)as this will be a rally car.

What compression should the pistons be?
What is the best brand of pistons to use?
Who sells them?

What sort of horse power will I get out of a 2.5 litre using 'rally cams', not wild track cams?

Posted: Wed Feb 28, 2007 5:40 am
by Greg Gordon
You might want to contact Vick Autosports. They run a 2.5 GTV6 race car. It has about 185hp at the wheels with their own design cams which they sell, about 10.5:1 compression, head work and SDS fuel injection.

Greg

Posted: Wed Feb 28, 2007 7:41 am
by IAN TT
I looked at their website. Their catalogue doesn't list any high comp pistons for the 2.5 but I have sent them an email anyway. Any other suppliers? Or would some of those motorbike pistons everyone talks about be suitable?

Posted: Wed Feb 28, 2007 7:46 am
by Greg Gordon
Vick is pretty bad about having the stuff they actually have in the catalog. You just have to call them and talk to Csaba as he built the car. They actually had a batch of cams made to the exact max allowable spec for the series they race in. They are "race cams" but by race standards they are pretty mild, should be great on a stree/track car. I am very impressed with the power they got without going crazy with compression, cams, headers etc. It's all fairly mellow stuff.

Greg

Posted: Wed Feb 28, 2007 5:46 pm
by IAN TT
Vick Autosports got back to me very promptly which was pretty impressive. They use 10.1 89mm pistons in their race car but I have to use 88mm pistons which they don't have.

Anyone got any other sources for these items.

Ian

Posted: Wed Feb 28, 2007 8:29 pm
by Zamani
Have you tried Beninca? They use ROSS pistons I think.

Paulspruell.com has 10:1 pistons for the 2.5 V6.

What I would look into is a set of quality rods and lightweight pistons.

Posted: Thu Mar 01, 2007 7:57 am
by Greg Gordon
I would call Vick and say "look, I know you guys have those pistons made to order, so get me a set in my desired bore size!" It usually helps to talk to Csaba.

Posted: Fri Mar 02, 2007 2:42 am
by scott.venables
What about Vin Sharp of PACE Engineering in Park Orchards??

Posted: Fri Mar 02, 2007 8:09 am
by Sporttunergtv6
spruell can even get you 11:1 if you want them
v

Posted: Sun Mar 04, 2007 3:32 am
by IAN TT
I have talked to Vin at Pace and to Benincas. They can get pistons made for me but they have a lead time of over two months so I thought that other sources might be quicker and just as good quality.

Ian

Posted: Sun Mar 04, 2007 5:46 am
by SydneyJules
Check out my specs mate.

In the time you wait for pistons, you will have plenty of balancing, forging, lightening, porting, and other shit to do.

I was lucky, and just had the thing rebuilt and fit up :D

Posted: Sun Mar 04, 2007 11:07 pm
by tImBoWe
I have got stuff from Paul Spreull a couple of times. Great selection. Heaps of knowledge.

Posted: Thu Mar 08, 2007 10:44 am
by gday
Maybe you should try calling Venolia directly. I would think they have some standard piston designs on file for the 2.5l. I had a set of pistons made for a 2l fiat a few years ago, and they were very helpfull.