Race car, dropped valve - Kawasaki ZX-10R.net
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post #1 of 18 Old 11-09-2008, 10:34 AM Thread Starter
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Race car, dropped valve

Geez. If I didn't have bad luck I'd have no luck at all.

I tried to race my car this past weekend and had another bad outing. I drove a handful of laps, then the engine started to feel lower on power, like running on three cylinders. Unfortunately, I didn't think it was a mechanical problem and continued to run the engine. I guess it wouldn't have mattered. Once a valve breaks there's not much to be saved.

Other than the disappointment of not being able to race (after untold hours of prep, towing to the track, etc.), I'm afraid I'll never know the cause of this failure. I don't think it was an over-rev. There is no evidence of the other cylinders' valves hitting pistons. Heck, I wasn't even driving hard yet, although I may have hit 12,500 RPM's a couple of times. The oil pressure was never low. In fact, it was higher than ever (60 lb.) after shimming the relief valve.

I'm using the stock air box, so it's doubtful I ingested anything. I think it's just more bad luck.

At least I've got all winter to recover.
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RussMcB
F1000 (SCCA Formula Car w/ '07 ZX-10R engine) - Sold in 2010 :-(
'99 ZRX1100
Marietta, GA USA

Last edited by RussMcB; 11-09-2008 at 10:39 AM.
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post #2 of 18 Old 11-09-2008, 10:51 AM
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That sucks! Could've been worse I guess though.

BURNOUT.....
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post #3 of 18 Old 11-09-2008, 11:26 AM
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bummer bro!




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post #4 of 18 Old 11-09-2008, 11:29 AM
 
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Sucks to happen, but at least now you have an excuse to build it
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post #5 of 18 Old 11-09-2008, 11:41 AM
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Man, the bad luck just continues for yah doesnt it.


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post #6 of 18 Old 11-09-2008, 12:32 PM
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I have some brand new OEM exhaust valves in the package in your need them.
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post #7 of 18 Old 11-09-2008, 04:15 PM Thread Starter
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Quote:
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Sucks to happen, but at least now you have an excuse to build it
Well, only if I thought I wouldn't get caught. Our rules say no internal modifications. :-).
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I have some brand new OEM exhaust valves in the package in your need them.
Thanks for the offer. I'll keep it in mind when weighing options.

I heard two things this past weekend, kinda interesting. These Kawasaki titanium valves start out as two pieces, and are then attached together (I assume via welding). A well respected engine builder says that's where they tend to break.

I also heard that some people prefer stainless steel valves because they tend to bend rather than break.

RussMcB
F1000 (SCCA Formula Car w/ '07 ZX-10R engine) - Sold in 2010 :-(
'99 ZRX1100
Marietta, GA USA
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post #8 of 18 Old 11-09-2008, 04:25 PM
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I've heard of valves being an issue on these bikes.
Even know a guy with a 2nd gen who had a failure and he was working at a kaw dealer.

What year was that motor? an 04 or 05?

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post #9 of 18 Old 11-09-2008, 07:14 PM Thread Starter
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Quote:
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I've heard of valves being an issue on these bikes.
Even know a guy with a 2nd gen who had a failure and he was working at a kaw dealer.

What year was that motor? an 04 or 05?
I think this one was an '05. I've got remnants of 4 ebay engines. I need to do an inventory and see what I've got that's good.
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post #10 of 18 Old 11-10-2008, 08:53 AM
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Man that sucks. Sorry to hear it. I had a valve guide break in my mustang and did a number on the motor and cylinder heads.

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Good luck with the rebuild
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