forged pistons opinions

dub-disaster · September 17, 2009, 12:13:05 AM

hi there just a quick question ,
is it possibe to run around 170-180 bhp with a 40mm ladder?? and secondly is it possible to run that sorta power without forged pistons? i know it may run the risk of melting the pistons wich if happens i will have to replace the black and pistons ??
I think that if i wanted to run forged pistons i would have to go to the larger bore?
All help appreciated thanks very much

PeteG40 · September 17, 2009, 08:15:53 AM

you can get forged pistons in normal bore, but they are the same price as bigger ones i think. So for the £100 extra reboring, it probably worth the extra price.

Melting a piston is a bit of an unknown - can be injector, fuel pumps, wiring, poor chip fueling, or even piston metallurgy. Sometimes they go and noone knows why! But normally the block can be saved by overboring

hayesey · September 17, 2009, 09:54:09 AM

is it possible to get 170-180 with standard bottom end and a g40 g-lader though. If you get the fuelling right then you shouldn't melt a piston, but you absolutely must replace things like fuel pumps, get your injectors cleaned etc...

jez1272gt · September 17, 2009, 10:37:18 AM

At 180bhp on a standard engine thats a 60% power increase over standard. If you are serious about getting that sort of power from a G (reliably) then i would say you need to be willing to dig deep into them pockets!! Forged pistons would be best IMO. As to whether 180bhp could be achieved on a 40mm lader - you guys can fight that on out

!

hayesey · September 17, 2009, 12:49:46 PM

QuoteAs to whether 180bhp could be achieved on a 40mm lader - you guys can fight that on out

well it can and has been done before. 194bhp is the highest I'm aware anyone getting a on the original g40 lader (although it was on stealth's rollers... still got to be 180 though).

jez1272gt · September 18, 2009, 03:44:29 AM

Quote from: hayesey on September 17, 2009, 12:49:46 PM
QuoteAs to whether 180bhp could be achieved on a 40mm lader - you guys can fight that on out

well it can and has been done before. 194bhp is the highest I'm aware anyone getting a on the original g40 lader (although it was on stealth's rollers... still got to be 180 though).

On a standard 1272cc py block? Must have had some serious work to achieve that sort of run!

Maybe Stealth's rollers are a bit optimistic

LOL

Yoof · September 18, 2009, 04:07:51 AM

Paul- Barneys was 1341cc BVH etc...

For a cast piston EGT control is key, powerwise you're looking at 45bhp per piston, which is by no means beyond the realms of man, at work the V8 runs 66bhp/piston, and they're cast items.

hayesey · September 18, 2009, 09:31:27 AM

QuotePaul- Barneys was 1341cc BVH etc...

I know it was, I was saying that power is possible with the g40 g-lader. Rest of the engine was far from standard.

Also Karl said it actually made 192-194 on aldons rollers too.