hairline crack on bridge

nmdesertrider · Post by **nmdesertrider** » January 6th, 2010, 9:59 pm

I have a cylinder that I would like to use but has a hairline crack in the liner right in the middle of the bridge.
Will the crack cause problems? I would think that if it had proper bridge relief it wouldn't- hoping to hear some other opinions.

asteroid500 · Post by **asteroid500** » January 7th, 2010, 3:48 am

PM roostious maximus...he'll set you strait

yota · Post by **yota** » January 7th, 2010, 4:09 am

mine was that way for a long time until resleeved. someone had ground a slight chamfer on the crack to be safe I guess. didn't seem to hurt anything.

nmdesertrider · Post by **nmdesertrider** » January 7th, 2010, 6:26 am

Just like what you got there- thanks for getting back to me.

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » January 7th, 2010, 7:37 am

i hacked it out

dannygraves · Post by **dannygraves** » January 7th, 2010, 7:51 am

yeah, I'd just remove it

glen howell · Post by **glen howell** » January 7th, 2010, 10:24 am

I remove the complete bridge on my new race porting.Glen

nmdesertrider · Post by **nmdesertrider** » January 7th, 2010, 3:01 pm

Does removing the bridge mess with the longevity of the cylinder/piston?

thestuz · Post by **thestuz** » January 8th, 2010, 4:26 pm

not sure, prob not if its done right.

ive noticed it happens on bores 90mm and over. ususlly when it gets bored over the scollops it cracks. its an observation ive noticed, maybe cos the metal bore thins out too much or something.

on that picture you show there, it looks like the rings have worn out on the bridge causing the blow by above it

Slomo · Post by **Slomo** » January 8th, 2010, 4:58 pm

nmdesertrider wrote:Does removing the bridge mess with the longevity of the cylinder/piston?

Cylinder no-
Piston yes- Exhaust side rings smear and stick eventually.

glen howell · Post by **glen howell** » January 8th, 2010, 6:15 pm

We've been testing two years and have had little problems with removal of bridge.The thing is you have to know how much and where to size the exhaust port to much excessive ring wear not enough loss in top end,just right Rings and piston under normal riding should last a long time.Even Honda say's own a stock engine change rings after 6 races,And a new piston when mesurment are out of spec. Glen

Slomo · Post by **Slomo** » January 8th, 2010, 6:39 pm

Not sure what "normal riding" is...

glen howell · Post by **glen howell** » January 8th, 2010, 7:09 pm

Show us the exhaust port. Boy don't let 100 see that piston heal for sure say it has been hitting the head.Glen

100hp honda · Post by **100hp honda** » January 8th, 2010, 7:52 pm

glen howell wrote:Show us the exhaust port. Boy don't let 100 see that piston heal for sure say it has been hitting the head.Glen

ive never had a problem with petes work, nor have i ever heard of anyone having a problem. if i hear of a problem ill be the first to post it up.

glen howell · Post by **glen howell** » January 8th, 2010, 8:14 pm

The piston appers to be smered all around ,The top ring is stuck way around. Show the exhaust port, I like the Idea of no bridge it works for us and most race engine porters.Glen

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » January 8th, 2010, 8:17 pm

my '86 engine is bridgeless, you gotta make the port easy for the ring to come onto, not flat accross it. no probs here, stil got all the squeeze and its faster than my other stuff

glen howell · Post by **glen howell** » January 8th, 2010, 8:20 pm

As the CBers say 10-4 GOOD BUDDY .Glen

ellett · Post by **ellett** » January 8th, 2010, 10:33 pm

Slomo wrote:Not sure what "normal riding" is...

Doesn't look like you know what "normal roller-blading" is either:

Slomo@TheBeach

BannedCR500Riders.com

hairline crack on bridge

hairline crack on bridge