First of all the motor is a 82 mm ls/vtec with fully built itr head with bc4 cams, two layer headgasket, omniman flat faced valves, 12.5 cr wiseco pistons, i beam rods, balanced crank. i just got the motor in and running and after about 145 miles into the break in, POP, it dies. I pop the hood to see my timing belt chilling not on the cam gears. a chunk of teeth are missing about three inches in lenght, the outside of the belt is still intact but just the teeth are ripped clean out. it was a brand new t belt on a totally new motor so my q is this, Is there a link between high comp and timing belt failure?? after it was all done i did a quick visual and some basic tests, the bottom end still spins freely and the cams still move so i have narrowed it down to a pressure problem between the motor and the t belt is this assumption correct or do i have a larger problem? any previous experience from anyone would be helpful at this time. thanks.

 

the belt could have been too loose or too tight.....

there are cars with a shitload more compression and stock belts and they do fine....

 

wow...your engine ok?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Supernatural &raquo;</TD></TR><TR><TD CLASS="quote">the belt could have been too loose or too tight.....

there are cars with a shitload more compression and stock belts and they do fine....</TD></TR></TABLE>


I have seen this a few times, either from an improperly torqued tensioner, belt to loose or to tight, or someone used a shitty aftermarket belt.

what brand t belt were you using?

 

it should be fine im just hopin i dont have to replace a piston, the valves no problem but the pistons better be fine. well what is the cr limit for a stock t belt does anyone have any experience with this?? ohh it was oem, and it wasn't loose but not to tight an inch of side play on exhst but should i do a diff spec for the cam+cr combo??

 

I think that your problem is related to the belt and how it was tensioned, not to the CR of the motor.

 

what valve springs are you useing? how do you know that your valves are ok,yet assume the pistons may be damaged? you should pull the head, i hope its all ok...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xEnderx &raquo;</TD></TR><TR><TD CLASS="quote">I think that your problem is related to the belt and how it was tensioned, not to the CR of the motor.</TD></TR></TABLE>

how hard were you pushing the motor when it went POP!

 

I agree with xEnderx

 

i wasnt goin to fast 75 in fith gear 4500 or so dointhe usual break in, no constant rpms. ohh about the valves i was sayin that they are easier to replace than a piston