I'm in the process of boosting a B18C block. I'm boring the block to 83mm with stock sleeves, wiseco pistons, and eagle rods, with a block guard installed.

The question is....Will i damage the cylinder walls with high boost?

 

donno the answer man but im at 84.5 on the stock sleeves running 25psi

 

I'm not 100% sure so i'm not going to throw mis-information out there, but I know alot of people say 81.5mm is as far as you should go on stock sleeves, i've seen 82mm boost motors, but the sleeves are paper thin so I would imagine 83mm would be almost non-exsistant. I don't even think you can bore the stock sleeves that much, I think the service limit is 82mm. Someone correct me if i'm wrong.

 

i was told 85mm was the limit i asked because like i sad im at 84.5 now lol

 

I think 82 is max on all b blocks besides the B20

 

84.5 on a gsr block stock sleeve? or b20 block? and 575whp correct? madness, you might be the first to have ever tried this???

 

You must be really stupid.. If you know nothing about your own setup, that's terribly pathetic..

 

yes 575 on a gsr block now it has been 2 years since i have even seen that block lol I have been rolling the bone stock one for a long time.

ima get ahold of mkc to ensure thats correct but im pretty sure

 

i dont know much about it thats probly how shops stay in buisness is people like me starting out learning yeah i think thats it, but i do know what i am told

 

I wouldn't go further than 81.5

 

i was always told 83 is about as far as you wanna push stock sleeves but dont know from experience. i have always ran sleeved blocks...

 

well i havent paid for sleeving so im 100% positive im still on stock sleeves, and im almost positive its at 84.5 now I could be wrong lol.

I was also laughed at when i said i wanted to make 400hp on a pfab log manifold, and am at 572/388 using it.

I am always someone that will share information about things when I have experienced them first hand

 

84.5mm bore on stock sleeves on a gsr block LMAO!!!!! pull your head off I wanna see that!

 

Do not exceed 81.5

 

so I have read alot of shouldnt's but noone has said it isnt possible.

am I to beleive most of yall dont really know if it is possible or you just like to assume it isnt.

 

correct!

 

81.5 is the number. If you want more, sleeve it.

 

Wow i bef call BS on that 84.5mm bore gsr block. Only way you can go 84.5mm in on a slight overbore on a B20 block. that large on a b18 block wouldnt even handle boost let alone your po9wer you are producing. someone gave you the wrong information bud sorry. Im not saying you arent makign that power but its certainly not on that size pistons with stock sleeves.

81.5mm is usually as large as you want to go. you can run 82mm but in all honesty the power production from 81.5 to 82mm isnt even noticable. even gogin from 81mm to 84mm the power production is going to be so small that it will nto be noticable only on a dyno and it wont be much unless you have an all out drag car with stupid head wortk and crazy cams with a massive turbo.

stock sleeves arent that strong and if you want to keep it reliable without spending 1000 on sleeves then do not go larger than 81.5mm and get a good tuner. you can crack stock sleeves with stock inertnals its all in the tune. generally 500whp is max to be made on stock sleeves from longevity. YES people have made 600-700whp on stock sleeves but those motor are very short lived

 

and i said i would make a call and find out atleast i admitted i may not be correct and im not sleeved 84.5mm lol

 

most people ive met say max is 82 and thats if u have some spare blocks laying around 81.5 is what id go after though

 

i say go with 82mm...your good to go! oh and thanks again for the xmas gifts yo! haha

 

theres no reason to go any larger then 81.5 on stock sleeves unless the sleeve is damaged to the point that it has to go to 82mm to clean up. youre not going to see any difference over that half mm extra except when the sleeve lets go because you made it too thin.

 

This is what makes me wonder about buying this B18C1 shortblock with pistons and rods that was just assembled...82mm is a little weary

 

i built plenty b series motors.. and i never went pass 82mm ( on stock sleeves that is ).. how in the hell did u get to 84.5mm without jumpin into a B20 block .. ?

pardon my ignorance if i miss something in your post

 

sleeved and bored to 84.5 man i was miss informed lol sorry for the confusion