BigErn

to lower compression ratio.

Pro's and cons please.

Also how much machining would be required to lower comp to 6.9:1 on a standard 4x4 YB piston?

Cheers peeps.

BigErn

fish99

You might want to speak to Mark at MAD as this started a debate on a topic I started. Cant find the link anymore on the Escos forum

fish99

here is the link...look further down for comments with regards to compression.

https://passionford.com/forum/showth...ghlight=metpol

BigErn

Ah I must have missed that mate.

Feel free to have the debate again on this thread as long as it doesnt turn bitchy.

fish99

Im sure it wont get bitchy.... nothing like a good debate.

I wont join in as I know nothing about compression...

BigErn

Im not massively clued up on it myself mate. Feel free to join in if there is a debate, its the only way to learn.

Miller 3

iTrader: (4)

My engine is @ 7.2:1 but i think if i was to do it again i would opt for a high comp engine around 8:1

BigErn

Why is that then mate?

Miller 3

iTrader: (4)

Well with the mapping capability of the top tuners today you are always going to get more power from a high comp engine' Not saying there is anything wrong with low comp (mine is) just see it as the way forward

JamesH

iTrader: (21)

Get this done properly, by someone who can do all the maths with the rest of your engine to work out the true comp ratio, as if you take too much off you can't go back, and will possibly weaken the piston

BigErn

It will all be done properly mate if I take this route, Im just wondering what pros (if any) and cons there are over buying proper low comp pistons.

It may stay standard comp yet, Im just looking at other options really for now.

NEIL A

iTrader: (6)

Ern what cams are you going tobe running if your going T4 just if you need to have valve pockets and piston machining it might be as cheap and a lot easyer just to buy low comp pistons.

BigErn

Im thinking on BD14 inlet and BD10 Exhaust for it. Unsure yet, as I havent fully decided what power and spec I want. Im just throwing ideas about for it at the mo.