High Comp 120cc Build

samIam

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Sept 8-10th is the big weekend. Brainerd is hosting a three part event...drag race, road course and drift course. I may even do the drift course since there was another 80s coupe out there drifting.

Photosuckit changed their policies and now require payment for them to host photos so you'll have to click on the pics to see them on their website.
 

samIam

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I had a blast at BIR!
I went 12.95 @ 102mph.
I don't have my slip with me but 60 was like 1.72 I think.
Car weights 4265lbs with me in it, 4015 alone.

The bad news....the damn fan belt came off again and she overheated. I got smoke out of the drivers exhaust, probably a head gasket. I don't really mind taking it apart since it's so easy and cheap to replace gaskets, as long as no cracks are found, I'm happy.
My first two runs put me at 13.3 @ 100mph so I went and adjusted timing, got 12.95, went for the forth run and the belt goes. It didn't get real hot cause I shut it down at the end of the track. The other time it overheated probably did the real damage. The track is an NHRA track so it's prepped well and the tires hooked no problem. Staged at 3k rpm and smashed to the floor at the light. Shifting at 6400 rpm. Got the parts on order now so it should be up in a couple weeks. Pics maybe, they posted a couple live feeds at the track on Facebook(Brainerd International Raceway). I'm on one at one hour, fifty nine minutes. It's the one that I lost the belt but you can see how good it launched.
 

8ad-f85

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Sounds like a blast!

I picked weather for Sept. 9 near mid day for a correction factor of 1.11
It corrects to a 12.51 @ 105.6
The temp did swing 30* that day.
 

samIam

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That's pretty cool. I can honestly say I have a 12 second, 19', 4000lb car.

Time slip shows..
1.77 sixty foot
8.206 eighth mile at 83mph
10.76 thousand foot
12.954 quarter at 102.25mph

The weather did change drastically. The morning was cold with frost over all the cars, the fastest run about 1pm was 75ish degrees maybe.
 

samIam

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Finally able to get the caddy in the garage to take apart. And found a new image hosting site!!

Cylinder 2 is the problem. Got a cool little borescope and you can see the problem right away, pretty cool little toy.
7JFLJyT.jpg


Inside the intake port of cylinder two
sIwTcal.jpg


You can also see the mismatch in the port after shaving the heads and some sealant protruding into the port a little.
M7nNKBm.jpg
 
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pila78

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If you are running an alternator, with the stock pulley on it, having the belt jump off is fairly common. I bought the slightly larger diameter deep-groove pulley for the alternator. The belt coming off usually took out the other belts, and had to buy three new ones !
 

Darius

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Except for the stamped numbers those pictures remind me of my last colonoscopy. Please keep that "cool little toy" to yourself, thank you. :oops:

d
 

8ad-f85

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Lol. My borescope hasn't been inside an engine yet. ;)
They are cheap enough to have a couple :eek:
 

El Diablo

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What vehicle(s) do you drive?
1959 Cadillac Sedan deVille
Except for the stamped numbers those pictures remind me of my last colonoscopy. Please keep that "cool little toy" to yourself, thank you. :oops:

d

Brother D, please tell me that your colon doesn't show wear marks with a little seepage from your #2 bore from a "port mismatch". Lol
 

8ad-f85

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Don't mess with taxes or go through divorce, the same methods apply.
 

Darius

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It could have been worse!

Nice to have found A problem.

Best,

d
 

8ad-f85

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Is there a suspected cause?
Forgive me if it was passed in the thread already.
 
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