Using 1.9 pistons in a 2.1 engine?

AMBROSIA · Post by **AMBROSIA** » Tue Feb 12, 2008 6:02 am

What's required to fit a set of 1.9 pistons and liners to a 2.1 case?
I presume the deck height will be the main problem.
Is the wrist pin located differently on the 2.1?

Many thanks for your time.

1303wasserbug · Post by **1303wasserbug** » Tue Feb 12, 2008 11:54 am

hey. can't fit em in cus the lenght from wrist pin to top of piston is much longer on the 1.9 to make up for the lack of crank throw. you don't happen to have a set of low comp 2.1 pistons to swap do ya?

AMBROSIA · Post by **AMBROSIA** » Wed Feb 13, 2008 3:23 am

you don't happen to have a set of low comp 2.1 pistons to swap do ya?

No, but i'm after a set of 2.1 high comp

marcotheturbosteamengine · Wed Feb 13, 2008 10:57 am

if you cut off 3.6mm off the top of the 1.9 pistons they will fit but you have to watch the valve to piston clearance(dependent on the cam and lift) the compresion will be 11,4-1 and the top ring gets quite close to the top.
good luck
marco mansi........

1303wasserbug · Post by **1303wasserbug** » Wed Feb 13, 2008 11:37 am

i have a set of 2.1 dj pistons that are no good to me cus to high a compression ratio with the turbo. they are used thou. oh and i've stripped my engine down to give it a freshen up as the knock on start up was anoying the hell outa me. i'm gonna have to use a 1.9 crank thou with standard pistons as i haven't got any low comp 2.1's. so wish i could jus go ahead and throw marco my 2.1 and a load a dosh, but jus can't afford that right now.

AMBROSIA · Post by **AMBROSIA** » Thu Feb 14, 2008 5:15 am

11,4-1

That sounds high for a street runaround plus i'm using 1.25 rockers.
Seems a shame to cut these pistons also as they are brand new proper German ones.

i'm gonna have to use a 1.9 crank thou with standard pistons as i haven't got any low comp 2.1's

How about a swop? I'll need to keep the liners and rings though.