Hi from Germany

[Maniacmechanic1]

It happens .
Tear it down.
Pay attention to the old headgaskets and look where they failed at.
Often light detonation or heavy detonation makes head gaskets fail.
Old age also.

 

[Indycars]

Last Saturday I had exhaust gases in my cooling system.

So how did you discover the problem?

 

[55C150]

The cooling was heating up very fast, I had a lot of pressure in the system and the last step was a test with a special liquid. You are sucking the air from the coolant inside the tester and the liquid will change the colour if there is exhaust gas in the coolant.

 

[55C150]

The engine is running great again. After cleaning everything and new head gaskets everything ist fine. I got 4 inHg more vacuum since rebuild. No exhaust in coolant anymore. I didn't see any big failure, I think it was a small crack in one head gasket.

I had to re-jet the AED carburetor, now 68 main jets in pri side and 75 in sec side. The Power Valve is a 9.5. I didn't touch the air bleeds. IFR is 33.
After all that the only thing that was too rich was WOT, i got 10.8 - 11.1 AFR. So I asked AED which size the PVCR is, the told me 55. That was way too big.
I know a good starting point is half the size of the pri main jet.
So I drilled and tapped the channel, so I can screw 6/32 jets in. After testing the 35 jet size was the best. I got 12.7 - 13.0 AFR at WOT.

Mechanic I didn't had the time to rewire the car with new battery cables, so the Alternator ist still not in the car. This is one of my winter projects.

 

[Grumpy]

great posted info, and Im glad every thing worked out so the engines running better

 

[Indycars]

I did something similar, drilling about 20 different passages in a new Demon carb, nice work !

Any other project other than the alternator in the plans for this winter?

 

[55C150]

Hi Rick, maybe converting the mechanic fuel pump system to a electric one. I'm not happy with the mechanical "high" volume pump.
Othe than that I helping out a friend, he will bring his 56 Cadillac over to me and I will see to get his new engine running and maybe helping another friend at his '30 Ford Coupe Hot Rod to rewire the whole car.

 

[Indycars]

Sounds like fun, rewiring a complete car! I would need drawings to do that myself.