Aluminum vs derlin carburator bodies on Tee Dee's

No and no.

The only bits I didn't flush inside. I did clean them, but I did not verify the passages.

Phil

That would be something to check. Also wouldn't hurt to check and see if the carb body gasket is not sealing correctly.

Cribbs74 wrote:That would be something to check. Also wouldn't hurt to check and see if the carb body gasket is not sealing correctly.

Or to make sure both of them are present.

I have one on an .049 and it runs fine.

I put them in. One is a thin washer, the other an o-ring.

I think I'll take the engine down and clean it again.

Phil

Phil,

I had a similar problem and found that, as I tightened up the body on the crankcase, the carb was ending up slightly (and only very slightly!) off centre. This doesn't happen with the delrin one.

After adjusting this - this meant loosening the body twisting it slightly out of line anti-clockwise and then tightening it until I could get the inlet thread perfectly vertical - repeating this time after time until it was right!

It tended to slip on the body to crankcase washer when tightening.

This made one hell of a difference!

It also helped me on my diesel TD - this runs best slightly off centre - before vertical rather than after!

ian1954 wrote:Phil,

I had a similar problem and found that, as I tightened up the body on the crankcase, the carb was ending up slightly (and only very slightly!) off centre. This doesn't happen with the delrin one.

After adjusting this - this meant loosening the body twisting it slightly out of line anti-clockwise and then tightening it until I could get the inlet thread perfectly vertical - repeating this time after time until it was right!

It tended to slip on the body to crankcase washer when tightening.

This made one hell of a difference!

It also helped me on my diesel TD - this runs best slightly off centre - before vertical rather than after!

I will be taking it down Monday or Tuesday to pieces and inspect everything. I was encountering that exact problem and thought I had it centered.

Phil

Maybe I'll take it down a this morning, soak it in denatured alcohol and put it back together a few minutes ago, after resetting the piston, then fill it with 3-in-1 (yes, not the best there is since it can get "gummy", but I will run the engine soon anyways and not put it up for storage.)

Everything was in order when I took it down. The denatured turn...brown, with lots of particulate.
I am never sure if I am over-doing the reset or not. It felt like it was binding a little before I oiled the piston, but seemed to work better after getting wet and being worked through some. Varnish was pouring out of the socket after I oiled it.

Yes, I use a solid surface to reset on, 168# of Trenton anvil (c.1912) with a 150# ash stump under it. (I am sure a scrap of plywood on the concrete garage floor would be excellent) I use a puny little 8 oz ball pein hammer, tap, rotate, tap rotate...check and repeat, check and repeat and check. The first few checks it seems like I didn't hit it at all, so I hit a little harder, then it makes progress and about 3 or 4 cycles to finish. I don't want to finish too quick and over-smash it.

A bit of tooth brush action on the venturi and etc. Blowing out the NVA to verify clean operation

I put a head gasket between the o-ring and the collet, since my .051 was assembled this way. No effort to align since tightening does not mess with alignment! The head gasket doesn't show either.

It sits on my desk wrapped in paper towel. I put a clamp on head with 2 gaskets, I put #3 in if I find performance is off. I might get it on the airplane tonight even.

Phil

1 run no restart...  Although it was the best run this engine ever gave me! I think I had it under-compressed.

I am going to swap cylinders to a near new one.  I think that the Sig Champion stripped the varnish on this one, and the toothbrush finished it.

Now I don't WANT to run the .051 I have.  I need a source for quality straight castor fuel, but I have almost 3 quarts of Sig Champion left.  These don't burn much fuel at all.

I put a carved up bottle on to hold the bladder on the Pink Zinger, and I think I am now slightly nose heavy since it wouldn't turn like I expected.

OK, wild thought, a drop or two of mineral oil in the exhaust between runs to restore compression for starting?

Phil

So much for Monday or Tuesday. Maybe I'll get time for a couple more runs!

Phil