Good but bad weekend.... - Team Camaro Tech
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post #1 of 82 (permalink) Old Jun 27th, 16, 04:16 AM Thread Starter
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Bruce
 
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Good but bad weekend....

I took my car racing this weekend. My goal with this car is to run 10.0.
Last year at Beaver Springs I ran a best of 11.42, on motor.
This year I ran 11.36 @ 117.64, so I was happy I beat last years time.
So I hooked up a 150 shot, and ended up running a 10.45 @ 125.64 but then it happened.
The motor shut down and wouldn't restart.
I got towed back to our pit area and my friend started to pull the plugs. The even side looked good, but then he hit #5 cylinder and there it was, the ground and tip were completely smashed, not melted, but smashed and water was in the pan.
He thinks we dropped a valve and cracked the head.
But hey, I at least got a 10.45 before it happened. I think it would have been a faster run, knowing that around 3/4 track, I felt a hesitation but I just stayed in it because I wanted my first 10. I didn't know that my first 10 was going to be my last one for awhile......
Not sure what I'm going to do until we look at all the damage but the thought of a 700hp, 489 or 496 sounds good.

69 Camaro, 496, 10.34 @ 134.77 mph.
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post #2 of 82 (permalink) Old Jun 27th, 16, 06:20 AM
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Re: Good but bad weekend....

Very good.
Unfortunate things happen and this is the risk we accept when starting for more speed/power.

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post #3 of 82 (permalink) Old Jun 27th, 16, 06:57 AM
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Re: Good but bad weekend....

Time for a LS swap

Sucks to hear that Bruce. That motor should've taken a 150 shot all day. Let us know what you find out.

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post #4 of 82 (permalink) Old Jun 27th, 16, 12:52 PM
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Re: Good but bad weekend....

Sorry to hear your damage....going Wed nite TNT myself....leaving the bottle home again until I get this thing ironed out NA.

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1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
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post #5 of 82 (permalink) Old Jun 27th, 16, 05:41 PM
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Re: Good but bad weekend....

Congrats on breaking into the 10's
Sucks about hurting the engine..
496 is a nice round number...
Good luck

Matthew 22: 37-39

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post #6 of 82 (permalink) Old Jun 27th, 16, 07:34 PM
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Re: Good but bad weekend....

I work on 3 cars that run there. One is a 65 Nova with a 489. It dynoedat 660 hp runs 10.20. We ran it two seasons had it rebuilt. Ran it 3 more seasons and rebuilt it last spring. We make about 200 runs a season. Seths built it and has been as reliable as you would want. I assembled it this time. It is pump gas 10 and half compression with a hydraulic roller cam.
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post #7 of 82 (permalink) Old Jun 27th, 16, 09:00 PM
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Re: Good but bad weekend....

Quote:
Originally Posted by ds1 View Post
I work on 3 cars that run there. One is a 65 Nova with a 489. It dynoedat 660 hp runs 10.20. We ran it two seasons had it rebuilt. Ran it 3 more seasons and rebuilt it last spring. We make about 200 runs a season. Seths built it and has been as reliable as you would want. I assembled it this time. It is pump gas 10 and half compression with a hydraulic roller cam.
Is that 660 to the wheels?
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post #8 of 82 (permalink) Old Jun 28th, 16, 07:55 AM
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Re: Good but bad weekend....

That is on an engine dyno. My HP to weight calculator says 525 to the wheel. It sounds low but I checked it a few times. My junk small block combos put down 425. I work on a 69 Nova with a Patriot crate motor they claim 430. It puts 446 to the ground.
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post #9 of 82 (permalink) Old Jul 6th, 16, 10:03 AM Thread Starter
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Re: Good but bad weekend....

Sorry guys, didn't know that I got any replies, no message was sent.

Here's an update, the #5 cylinder is totally wasted, cracked from top to bottom, and it looks like it started to split, going around the diameter of the cylinder. The exhaust valve broke off and was laying inside the cylinder and the piston looks like a moon crater. This is just not going to buff out no matter how hard we try. All the exhaust valves were hitting the pistons, so it was a matter of time, but maybe the 150 shot just helped it come a bit earlier.

The new roller rockers, each exhaust valve retainer and by the roller tip were showing rubbing signs and it appears that they were not riding on the stem of the valve but on the retainer. Too many things happened to this motor to think what may have caused this. Some people are saying weak springs, some people say over-revved, some people say improper pushrod length, but we will never know, it's history and on the way to the junk yard.

I'm parting out what I can to get some block money and then we will see what happens with a new and bigger build.

Hey DS1, were you up there that day? I went up on June 25th.

69 Camaro, 496, 10.34 @ 134.77 mph.
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post #10 of 82 (permalink) Old Jul 6th, 16, 10:26 AM
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Re: Good but bad weekend....

PTV clearance obviously was not checked and probably the pushrods were not the correct length.

Who built the engine?
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post #11 of 82 (permalink) Old Jul 7th, 16, 04:26 AM Thread Starter
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Re: Good but bad weekend....

PTV was verified by the machinist before I finished assembling the motor.

He also assembled the heads and specified all of the valvetrain components and he did say that stock length pushrods could be used.

But we won't get into that issue, because it's a sore subject.

All I can say is, my lesson was learned along with several others as well.

69 Camaro, 496, 10.34 @ 134.77 mph.
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post #12 of 82 (permalink) Old Jul 7th, 16, 07:01 AM
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Re: Good but bad weekend....

maybe valve float if the PTV was OK
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post #13 of 82 (permalink) Old Jul 7th, 16, 10:48 AM Thread Starter
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Re: Good but bad weekend....

That's been brought up.....but let's just say the next motor will be done, better......
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69 Camaro, 496, 10.34 @ 134.77 mph.
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post #14 of 82 (permalink) Old Jul 7th, 16, 11:18 AM
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Re: Good but bad weekend....

That's bittersweet by pure definition. Congrats on breaking into the 10s. Sympathies on sacrificing your engine in doing so. Let me brighten this up for you just a bit, blown engine and all: you went faster and did so quicker than probably anyone was able to without truckloads of $$$$$$$$$$$ and 100 corporate sponsors in 1960. Now doncha feel better already? I only added that cause I know you can't throw a wrench at me and hit me.
Let me close with this: There are two kinds of racers, those who have gone there and done that and blew an engine doing it and those who have gone there and done that and are gonna blow an engine doing it. As the British SAS motto reads" WHO DARES WINS"

Congrats again in joining the 10 second club.
WILL

Detective Lt. Will, Chief of Homicide/ Chief Deputy Coroner: RETIRED AFTER 32 years.
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post #15 of 82 (permalink) Old Jul 8th, 16, 03:09 AM Thread Starter
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Re: Good but bad weekend....

Thanks Will....and to everyone else.
My wife said to me on the way home, you don't seem to upset about this. I said this is racing, yes I'm upset, this is the first year that my health has been good and I wanted to go race the car, but the fact is, the next time I hit the track, I'll be running 10's without the help of nitrous and 9's with help, so it s a win-win situation.
She then looks at me and says, you better get a second job!

I think she was serious too....LOL

69 Camaro, 496, 10.34 @ 134.77 mph.
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