High comp stuffs

LewisH · Post by **LewisH** » Wed Jan 30, 2013 11:20 am

Ok,

Ive been looking at high comp stuff......

Found some nice 12.0:1 pistons.

I know that is VERY high comp, but would i need my car mapping if i was to get pistons that aggressive?

Lewis-

Post by **NafemanNathan** » Wed Jan 30, 2013 11:23 am

LewisH · Post by **LewisH** » Wed Jan 30, 2013 11:26 am

I know id need it done anyway mind. Dont even know why i asked such a silly question to be fair.

But, is 12.0:1 silly high compression, or just... nice....

Lewis -

Post by **Merlin** » Wed Jan 30, 2013 11:27 am

To use them properly you would need to spend many £xxxx to get the additional parts to back them up, and probably the same in labour to get it running right. Also one of the only non-OEM pistons you can use off the bat are Mahle Gold Series, due to the H22's FRM (fiber reinforced metal) cylinder lining.

Post by **Lude-dude** » Wed Jan 30, 2013 11:31 am

yeah thats very high compression build... you need to back it up with head work, breathing mods, cams

LewisH · Post by **LewisH** » Wed Jan 30, 2013 11:36 am

Well i would do headwork, cams, inlet etc (already have zorst) if i go high compression, is there any other bottom end work other then con rods that will need changing (and bearings/rings ofc) ?

Post by **NafemanNathan** » Wed Jan 30, 2013 11:41 am

The crankshaft assembly (inc flywheel, crank pulley) needs to be re-balanced ideally.

FrontBackSide2Side · Post by **FrontBackSide2Side** » Wed Jan 30, 2013 11:42 am

as Merlin has said you will need to sleeve your block if they aren't the Mahle gold pistons. I've read quite a few bad things about the Mahle gold pistons though, they dont seem to last.

Post by **Merlin** » Wed Jan 30, 2013 11:44 am

You'd want some aftermarket rods in there for sure. And since the guts of the engine is out it would be silly not to replace items that wear (bearings etc..). IMO a build like that will be knocking on the door (if not kicking it down

) of £10K to do properly.

LewisH · Post by **LewisH** » Wed Jan 30, 2013 12:00 pm

10k is a bit of an ott judgement in my opinion. The precision machine work i get done at "mates rates" so to speak.... already contacted a place about alot of engine work to be done and the quote is very nice indeed

Lude Generation

High comp stuffs

High comp stuffs

Re: High comp stuffs