Stroker S2

[Pat D]

New pistons finally arrived, can finally get the engine build moving again

[Graham]

OMG Pat---cant wait to see her running

[Chris5044]

Im liking this project My fav colour also (the car)

[inne3quattro]

Great build, thanks for sharing, all the lows make the high's higher,looking forward to hearing it,well done

[Ruffiano]

What head gasket will you be using? 82.5mm pistons correct?

[Pat D]

Im liking this project My fav colour also (the car)

Great build, thanks for sharing, all the lows make the high's higher,looking forward to hearing it,well done

Thanks Definitely been a good test for patience.

What head gasket will you be using? 82.5mm pistons correct?

82.5mm pistons is correct, and I'll be using the standard MLS gasket bored out to 82.75mm

[JP]

Be careful overboring the stock gasket that far you may very well find that you end up loosing your fire ring at which point there may aswell not be a gasket there.

[Pat D]

Hopefully it works out, I never knew it was going to be a pain in the ars*e getting different sized MLS gaskets. I would've stuck with the original bore size otherwise and not worry about those extra cc's

[JP]

I always build to 82mm for this reason. With the added benefit of improved piston stability over larger pistons at high rpm.

Other option is to copper o-ring the block and use the 7A fibre headgasket. Which is a trick the Group A rally cars used to do in the olden Cossie days.

[Pat D]

I was going to copper o ring the MLS for a better seal. Does the 7A gasket gasket have a larger bore? I thought I read somewhere it was also thicker than 1.61mm MLS.

[andy10v]

Iroz does oversize gaskets

http://www.irozmotorsport.com/multi-layer-steel-headgasket-5-cylinder-10v-or-20v/

[|CL|NIKI]

I always build to 82mm for this reason. With the added benefit of improved piston stability over larger pistons at high rpm.

Other option is to copper o-ring the block and use the 7A fibre headgasket. Which is a trick the Group A rally cars used to do in the olden Cossie days.

JP - how is this o-ringing done/made?
Is there a thread showing aal procedure with pics?

[butchone]

Measurement wont be far off using that method. And if already decked that would throw measurements from stock.



Welding will only work with dissimilar rod though. Not much difference to your method other than no issues when decking the block.

bump on the copper o rings jp, i presume these grooves are for extra cooling so how close would the copper o rings be to the cylinders? plus the ring would only be very small diametre?

[AndyP]

A quick Google of "O ring head" will give you a rough idea



From a BMW forum, but the principle is the same

http://forums.bimmerforums.com/forum/showthread.php?1072411-PICS!!!!-O-ring-block-avoid-head-gasket-failure-w-BIG-BOOST

[Tonks4x4]

People used to copper ring lots of Rover V8's back in the day


Tonks4x4 - The Land Rover Specialist