Safe Overbore?

Reply Subscribe

Thread Tools

Search this Thread

Nov 20, 2001 | 08:05 PM

Weslay

Thread Starter

Joined: Nov 2001

Posts: 27

Likes: 0

From: Birmingham, AL

Safe Overbore?

How much is safe to overbore a b18? Is .25 ok? still reliable and strong?

Nov 20, 2001 | 11:32 PM

Arturbo

Better than steak

Joined: Jan 2000

Posts: 16,859

Likes: 0

Re: Safe Overbore? (Weslay)

Per the helms .020 is the limit, or 20 over. That is the normal honing when rebuilding.

Nov 21, 2001 | 05:23 PM

Project X

Trial User

Joined: Jan 2000

Posts: 828

Likes: 0

From: Canada

Re: Safe Overbore? (Weslay)

I have mine B18B overbored 0.5mm.

Nov 21, 2001 | 05:35 PM

immortal

Banned

Joined: Aug 2001

Posts: 2,250

Likes: 0

From: Bay Area, CA, USA

Re: Safe Overbore? (Project X)

Quote:

I have mine B18B overbored 0.5mm.

.5mm is .020 over

.020 is in INCHES it equates to about .508 MM.

you can go .030 over even.... but its not recommended because if your block gets damaged you cant bore it over much more.

if you plan to run forced indcuction, its not good to run .030 because the cylinder walls become to thin and you cant boost a lot.