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bobcowan
08-13-2010, 10:14 PM
I was doing some laps at High Plains today, and blew up the engine. Dang it. I was really lookiung foreward to next Saturday

The first 45 minutes were awesome. The weather was perfect, the track was fast, and the car was just smokin' fast. When you're in the groove, it just feels so good.

Then, all of a sudden, things went south in a hurry. As I came off the back stretch and in to turn 4, the car instantly ran rough, and smoke was coming out the right tail pipe. Dang it. As soon as I could get off the racing line, I pulled it over in the grass. It didn't appear to be leaking anywhere, just steam from the tail pipe.

I turned the keay, and it started right up. It was clearly running on 7 cylinder, but it ran OK. I drive the mile or so back to the pits, and drove it onto the trailer. When I got home, I drove it up onto the lift, and started taking it aparts.

My first clue was these three mystery bits. The two small ones were on the intake manifold. The longer piece was sitting on top of the #4 throttle blade (8 stack EFI).

http://i13.photobucket.com/albums/a256/bobcowan/smallpieces.jpg

When I pulled the valve cover off, the #4 valve springs didn;t look right. I pulled the rocker off, and the valve came with it. Uh, oh. That can't be good.

http://i13.photobucket.com/albums/a256/bobcowan/smallvalvespring.jpg

A dropped valve always cause some damage. I had no idea.
One of the valve heads (intake?) is imbedded in the chamber wall. That's an oil ring stretching across the ports.

http://i13.photobucket.com/albums/a256/bobcowan/smallhead1.jpg

The piston didn't fare so well, either.
http://i13.photobucket.com/albums/a256/bobcowan/smallpiston2.jpg

Well, I was planning to rebuild this engine in a couple of months. I still had three races, two club events, and a show or two to attend. This is going to cost more than a simple overhaul. It will take me at least a month to get it running again.

Sigh.

ker
08-13-2010, 11:40 PM
dang bob. sorry to see this and miss you next weekend.

but when real american horsepower goes - it goes in a big way. noth'n wimpy.

Snymo
08-14-2010, 08:44 AM
Wow Bob!! I wondered where you disappeared to yesterday but never thought that would be the reason. Hope everything goes smoothly in the rebuild efforts and you are back on track soon.

gollygwagen
08-14-2010, 05:31 PM
I was actually watching you go down the back straight when it cut loose. I thought it looked bad, but when you drove in under your own power I was hoping it wouldn't be so bad. Looks like is was.

Good luck man. Bummer about that.

ar design
08-16-2010, 10:57 AM
Saw your car there, what a bummer! Good luck man!

GECCO
08-16-2010, 02:59 PM
Wow, Bob, sorry to hear about this and see the pics. Didn't seem that bad when you pulled into the hot pit, I thought it had just blown a head gasket :(

Best of luck with the rebuild!

Pat
08-16-2010, 05:56 PM
Ooof, that's brutal. Sorry to hear it, Bob.

bobcowan
08-19-2010, 08:57 AM
Thanx for the condolances. It didn't run too bad when I drove it. When I got home it started right up and I drove it onto the lift. I was hoping it was just a head gasket.

The rebuild is going well - so far. Parts are ordered and most have already arrived. Head & block are at the appropriate machine shops. If all goes well, I'll have it up and running in two weeks.

ker
08-19-2010, 09:40 AM
Thanx for the condolances. It didn't run too bad when I drove it. When I got home it started right up and I drove it onto the lift. I was hoping it was just a head gasket.

The rebuild is going well - so far. Parts are ordered and most have already arrived. Head & block are at the appropriate machine shops. If all goes well, I'll have it up and running in two weeks.

with 200 more hp ;)