Hey wasup, I picked up a spare b18b block and might be interested in overboring it and slaping in some new pistons.

Now at my shop we have a bore and hone machine. We have done many many SBC's and several other closed deck apps. Never an open deck like the Honda.

After searching many people say to just buy sleves but thats hella expensive considering I will never make that much WHP. Some say it can be done you just have to keep small like .5 or 1 MM with a torque plate.

Can anyone comment on this. give me reasons why I should not over bore the block.

Merci Beaucoup,

 

anyone?????

 

I think max bore on stock sleeves is 82mm so 1mm over std. Id only go 81.5 if you are running boost though.

 

no reasons that i have found that you shouldn't bore a honda block as long as you don't go too big

82mm is the max i have seen on stock sleeves reliably

the most common size to bore the engine to is 81.5mm

james

 

The next bore size above stock size is an 81.5mm bore. If you arent planning on high boost, then the stock sleeves at 81.5mm bore should withstand the boost that you plan on doing.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by exospeedAMcrx &raquo;</TD></TR><TR><TD CLASS="quote">The next bore size above stock size is an 81.5mm bore. If you arent planning on high boost, then the stock sleeves at 81.5mm bore should withstand the boost that you plan on doing.

</TD></TR></TABLE>Thanks for the reply. Have you bored out a block? Because, I was hoping to talk to someone who has before. you know to get a first hand experience.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by exospeedAMcrx &raquo;</TD></TR><TR><TD CLASS="quote">The next bore size above stock size is an 81.5mm bore. </TD></TR></TABLE>

What happened to 81.25?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turboteg96 &raquo;</TD></TR><TR><TD CLASS="quote">Thanks for the reply. Have you bored out a block? Because, I was hoping to talk to someone who has before. you know to get a first hand experience.</TD></TR></TABLE>

We build race engines. We do sleeving, bore, hone, etc all the time.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drdisco69 &raquo;</TD></TR><TR><TD CLASS="quote">

What happened to 81.25?</TD></TR></TABLE>

exactly. i had .25mm over ctr pistons in my b16...

 

an 81.25mm piston would require a block HONE, like exospeed said. When you bore a block you usually do it is .5mm incriments.

 

well honda calls it a .25mm overbore, and so did my machine shop, so that's what im going by.