Im going to purchase some IB super Dupers gasported pistons 13.6:1 compression I wanted to run stock sleeves with race gas. I think its possible just would like another few opinions from people who actually run big compression motors. Oh its 85mm bore.

 

sleeve it or u will b sorry

 

85 mm bore is REALLY big for the stock sleeves, even on mild compression (9.5-10:1). Being that you are running high compression, where you pretty much HAVE TO run race gas anyways, I would highly recommend sleeving the block. Your looking at a lot of pressure for such thin, stock sleeves at 85mm.

 

my ls/vtec might end up having 12:1 or roughly 13:1 comp....would that be too harsh for 93 octane?


bump for this thread.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1 2 NV &raquo;</TD></TR><TR><TD CLASS="quote">sleeve it or u will b sorry</TD></TR></TABLE>

 

ask indo jeff on this board i think hes runnning high comp with stock sleeve i think hes 84.5 mm endyn piston

 

I run 84.5mm on 12.5:1ompression right now but after talking to a local all motor shop Im going to sleeve that sucker. Go 86 on 14.51. Its a race car so no street driving for me to begin with. Guess I need to start saving up for multiple head gasket money.

 

I ran 12.5:1 on daily driving 93 octane for about ayear before i went race car.

 

Mine is already 84.5 B20 block

 

sleeve it especially if you have siamesed b20 sleeves, they crack like west b'more