What would be the disadvantages of boring out a b18c Sir-G motor to 86mm with the use of new sleeves? This would give me over 2000cc, based on the calculations, but what would be the disadvantage. I am also using Jun stage 3 cams so I do rev the engine to 9000+ rpms.

Thanx

 

cost.....can the block go that big? and still be able to cool down?

 

would have to get new sleeves first.

 

Definitively new sleeves, but, exactly what Spade asked, what about the cooling and engine speeds?

 

gloden eagle sleeves should work fine for cooling I would'nt go w/ anything else

 

WE HAVE MANY B SERIES 85MM BLOCKS DRIVING DAILY WITH NO PROBLEMS AT ALL.. FROM STOCK SLEEVED CRV'S (1MM OVER) TO SLEEVED LS'S AND GSR'S...

86MM HOWEVER, IS PUSHING IT AS FAR AS STREETABLE BORE SIZE GOES..YOU WILL HAVE OVERHEATING PROBLEMS DUE TO THE INNEFFICENT BORE TO BORE SPACING....BUT FOR TRACK USE..86 IS FINE..AND WE ALSO HAVE 87 MM B SERIES RACE BORES RUNNNING STRONG.

 

Yes, I have heard that 85mm is the most one should go for a street/track car. I am not that much into drag racing more so into track racing so there is even more potential for problems with heating, this is why I wanted to hear some opinions. By the way would anyone know what is the ratio of the sleeve to the actual casting between the cylinders? I know that the thickness is 9.2mm, but how thick is the sleeve part and how thinck is the casting part?