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Bikedad Go Boom!
by
bikedad
on 11 May, 2011 00:16
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Went to Great Lakes Dragway for Street Tire Tuesday.
First run: 60ft= 2.177
1/4mi = 13.20 @ 111.31mph
2nd run: 60ft= 2.124
1/4mi= 13.07 @ 111.69mph
3rd run: 60ft= 2.068
1/4mi= 13.06 @ 111.01mph
4th run: Motor go BOOM!
I had a fantastic launch and the car was pulling hard. Just before the traps I think I over revved the engine trying to break into the 12 second realm. I heard this sickening pop sound and then the car shuddered. I cruised into the shut down area and noticed the car had a miss and there was a bad tink- tink- tink sound.
I instantly pulled it over on the return road and shut it off.
I didn't vent the block but there was a loud enough clanking sound to know something definitely was broken.
I think I either dropped a valve or broke a connecting rod. I'll find out when I get the motor pulled apart.
Bummer! It's the beginning of summer and my toy is broken.
I was contemplating going stroker. I guess I might be doing that sooner than I thought.
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#1
by
blacksi
on 11 May, 2011 00:31
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Could be something as simple as a rocker came loose. On a positive vibe.
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#2
by
bikedad
on 11 May, 2011 00:37
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Could be something as simple as a rocker came loose. On a positive vibe.
I hope it's something simple but I'm not taking bets. I should be so lucky.
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#3
by
Dr1ft1ng0wns
on 11 May, 2011 00:51
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That sucks. Sorry to hear that Don, hopefully it's something cheap.
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#4
by
bikedad
on 11 May, 2011 00:55
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That sucks. Sorry to hear that Don, hopefully it's something cheap.
Me to.
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#5
by
Jordan Innovations
on 11 May, 2011 03:36
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I remember Great Lakes Dragway!! Great track.
Sucks, but as was mentioned, might just be a stripped rocker bolt or something up top. Did you check oil pressure when you heard the pop? That's always what I do.
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#6
by
spacevomit
on 11 May, 2011 03:39
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Oh snap!
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#7
by
Rayminator
on 11 May, 2011 06:36
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So close to a 12 sec. pass.
How did you get the car home? They do not let you leave them overnight at the track.
I will ask a friend what he has in his engine inventory, just in case it was a major event.
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#8
by
BeatTheTunaUp
on 11 May, 2011 07:47
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Sucks, I know the feeling. I left it in 4th too long and spun a rod bearing with 800 miles on the motor
Not bad times for those 60ft times. Easy 12's with some drag tires. Every tenth of a second in the 60ft equals 2 tenths in the quarter. Looking at 12.50's with an easy 1.8 60ft. Oh well, on the bright side, the new motor is faster
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#9
by
bikedad
on 11 May, 2011 09:46
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#10
by
zbrown
on 11 May, 2011 11:14
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Pics! get that thing tore down!
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#11
by
mattster03
on 11 May, 2011 11:15
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ouch! what rpm did the failure happen at?
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#12
by
bikedad
on 11 May, 2011 11:50
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ouch! what rpm did the failure happen at?
I got a good launch on the last run my 60ft was down to 1.9
I was in my torque curve early in the run and was at 6500rpm before the trap. I should have shifted but thought I could push it a little more. I think it let go at 6700rpm.
I'm running solid lifters. The valves don't float. Something just gives.
When I heard the pop I slammed it into neutral and coasted to the return road.
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#13
by
bikedad
on 11 May, 2011 13:21
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So, minor update.
Got home for lunch and had to pull the valve covers to start the investigation.
#6 exhaust valve adjuster was sitting in the bottom of the head. Looks like the stud snapped.
I haven't turned it over yet to determine if anything else is broken.
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#14
by
theantirotor
on 11 May, 2011 13:24
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so the stud snapped, but all of the valves were still in position? may be a good idea to do a leak down before tearing it apart. who knows, everything else may be ok!
