Is it possible to fit Ross forged pistons in my Wossner specced bores?

[Taggy]

I just wanted to check but is it possible to use 74.5mm Ross forged pistons in my Wossner 74.5mm bores. Or are the specs not the same between the two?

[_shaun_]

Think it be worth putting up both spec sheets for the exact piston sets see if its compatible

[AdamB]

I'm sure out of all the piston manufacturer's Wossner run the tightest oil clearence, even CP Carillo's are 0.0035 a long with Wiseco and Ross I believe are also the same. JE is also another possibility but I'm unsure of their specs as it depends on the material composition.

[Taggy]

Ah i am not gonna run the risk, spoke to Wossner and its ok to bang another set in so thats what I am going to do, although bit anoying i have to buy a brand new set!

[starletburkie]

Sorry, do wossner rings need capped if the bores are done to spec??

[AdamB]

Sorry, do wossner rings need capped if the bores are done to spec??

If you meaning gapping then yes. When building the engine you'll need to measure the piston oil clearence, which is the bore size - piston size. And the ring gaps will also need to be set according what the engine is going to be used for, ie high boost application, low boost, nitrous etc. Most manufacturer's offer some sort of equation to work out the correct ring gap depending on the size of the bore.

Taggy was trying to find a piston which would run the same oil clearence spec as the Wossner without having to re-bore the cylinders as other manufacturers run a larger oil clearence.

Edited April 6, 2013 by AdamB

[starletburkie]

Meant gapped mate ya. Cheers for that

[Taggy]

Yes Adam has got it spot on