use them- they work

tiny rock somehow flew up in cam gears and jumps lots of teeth on the timing belt-lots of piston to valve contact
motor had 20 minutes on it-
happened in qualifying-

note: b16b motor was swapped out to b16a bottom end-
timing cover wouldnt fit on the b16 head because of the deck height dif. in the motors.

 

that sucks. I've been running w/o the upper timing cover for like 4-5 track events, but luckily no damage. But I'm def. ordering one before the next event. Also, locktite those bolts for the cover!

 

The upper on my CRX hasent been on in 3 years... :X

 

Jeff, we have a basically complete B16a2 bottom end...

 

its not the bottom end that concerns me- -
ill get the headoff this week and pray for just a couple bent valves-

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by R you serious &raquo;</TD></TR><TR><TD CLASS="quote">use them- they work
</TD></TR></TABLE>

How do you know it was a rock that caused the belt to jump?

 

only think i can think of -
there is no grass around the track- only gravel-
tension was still tight and the belt as well.
had to have been a small rock or tire goober

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by R you serious &raquo;</TD></TR><TR><TD CLASS="quote">only think i can think of -
there is no grass around the track- only gravel-
tension was still tight and the belt as well.
had to have been a small rock or tire goober </TD></TR></TABLE>

Well, if the motor only had 20 minutes on it, I'd have guessed something else caused it. Occam's Razor and ****. I could totally be wrong though. That sucks either way!

-Chris

 

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

How do you know it was a rock that caused the belt to jump?</TD></TR></TABLE>

That's what I was going to say as well. Innocent until proven guilty!! I highly doubt it was a rock, especially on a new motor.

 

FWIW - there were a ton of rocks flying around that track, so I think it could be a valid theory. I saw several broken windshields and one of the H2 cars even got a rock lodged in his rear caliper somehow and it made the most god-awful noise you have ever heard as it scraped along the rotor. Plus, the paddock was basically just a gravel surface, so even driving around the paddock you were constantly kicking up rocks. Not saying that it definitely caused the failure, but I think it's more plausible than you guys are thinking.

 

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

Well, if the motor only had 20 minutes on it, I'd have guessed something else caused it. Occam's Razor and ****. I could totally be wrong though. That sucks either way!

-Chris
</TD></TR></TABLE>

x2 If it were a rock I bet there would be damage to the belt.

 

rock is the only thing i can think of, as the tensioner was still tight and so was belt-
ill know when i pull off the lower cover- i hope there is a small rock in there- if not its a mystery-

 

Well if you don't find one, see if the camshafts actually rotate. It took me 20 minutes this one occasion to find out that a cam has seized in the head (bad head to cam clearances). I really hope that a simple stone is the case.