dumb question but can you answer it ?

Guys THank you for helping. Things i did today ...that may help someone tell me whats going on .

Ok as i said a few hours ago I pressurized the radiator .. and the system held pressure . not leakage.

Next I warmed the car up for about 15 min ... still smoke coming the tail pipe which is the rear header ( fenton ) on this motor . runs rough .

1 I pulled all the plugs and wires , then tested one by one tested the cylinder pressure I got they all came between 147 and 150. Which I was happy to find!

Next I, want to make sure I was getting spark .due to the fact the back plugs smelled of raw gas. last plugs looked brand new compare to the front 3 , not soot , smelled like gas but no . soot . so Jake thinks no spark to the plugs not sparking off gas,... So one by one i tested the wires to see if i was getting spark i got an arch on each one .

I noticed raw gas seaping out of the last exhaust port...top in between the gasket and head .. so then im like is it the carb ?? so i pluged the fuel to the back carb and tried to run just the front carb ... less smoke... smoke reaches about 10 inches away from tail pipe . which is better than the cloud from before ...


but still don know whats going on ? could this be a valve issue ..? cracked head ? I have good pressure in cylinders wtf ... Im losing it .............!

 

back carb way too rich, or leaking.

 

Rear carb. flooding? Check float level. Needle/ seat. ??

 

If it is flooding cyl 4, why is it not flooding cyl 3 fed from the same intake port??? The valves are on the same level side by side.

Have you changed spark plugs. I have seen compression pressures in the range you have blow out plugs, as in keep them from sparking. I have seen it more than once. Could be bad plugs. A spark on a plug outside the cylinder does not necessarily mean it is sparking under pressure in the cylinder.

Are you using "radio wire," the newer stuff which is nothing more than a dirty string, or have you got wire wire, the old kind?? If it is radio wire with more than 50,000 or a few years on it, replace it. Those strings get brittle and will break.

I know, why only the back 3 ??? I'll try & figure that one out if somebody can answer my question at the top of this.

 

OK, try this: I'm thinking the rear cyls washed out. Remove plugs, put some motor oil in each cylinder and install NEW plugs. Should be good. Then move on to failed carb.

 

ok so im going to put the old intake on .... and put new plugs on ... and see what happens. I think there def something wrong with the back carb ...can a intake leak cause the rough idle and excessive gas being put in cylinder ?

 

Also ... I set the float at 1 9/16 upside down and 1 3/4 . i was told this was right ...

 

An intake leak can cause rough idle but it's not likely that it could cause excess fuel. A messed up carb (float/needle/seat/etc) can cause excessive fuel.

 

thanks guys ,,..... im gonna try this and post later . thanks again . Im glad i have you people to turn to ,...

 

Are you 100% absolutely certain there's not any obstruction in the exhaust system utilized by the rear cylinders. Takes about 0.02 seconds for a mouse or anything to crawl down or fall down an open pipe.

 

If your back three plugs are clean and are wet, they are not firing........I'd look at your ignition from the dissy to the plugs. The 'smoke' could be unburned/half burned fuel.
Is it running on three? or four/ fiveish?

A compression test will not tell you how your oil rings are doing, only your compression rings. A leakdown test is required to get the full picture.

More info required??

 

Just do one thing at a time or you won't know which caused it. Just slide a piece of tin can under the back carb & tighten it down and take off the fuel supply off. It might save you a whole manifold change. It will run on just the front carb.

 

ok so this gets more dumb ....... I just too off both carb tops to compare float height. float heights are the same ... then i notice there no jet on the back one ...WTF . so i have a spare carb the jet is a 59 can i use that ? the front carb jet is a 51 ..

 

its gotta be better than no jet.

 

Yeah, put the 59 jet in there, might run a little rich, but not by much.

This is probably your whole problem. Good find. Let us know.

Check with the carb king on hamb for proper jets.

 

From your other thread :
http://www.jalopyjournal.com/forum/showthread.php?t=588595

Post #1

Ok here goes I have a 235 with dual carb and dual exhaust . I just recently had to rebuild carbs due to crap in bowl , I drove it and it ran like crap . cleaned out rear carb and put a new intake/ exaust gasket. .. and noticed its smoking white slightly blueish smoke but its only coming from one tail pipe . which is the rear header on my 235 . Plugs were a bit wet / oily .... any thoughts ...

Post #2

oh i ran the dual carbs for about 3 weeks before this current problem ...

how the hell is that possible ?

Where did the jet go? Better find that rascal

That ran fine for 3 weeks without a jet, then should run fine now without a jet shouldn't it? There's a reason nobody can figure out the problem, BS info makes for a wild goose chase & obscure guessing doesn't it?

 

Ive found dog food in radiators,intakes,blocks ect. i thought i was the only only one,that exh story is cool can i use it..lol.............YG

 

31 Vicki, your my new hero, I'm sending you a case of your favorite beverage.

 

Tequila, 1800 silver , black label, one bottle is good. Lol

 

I'm gonna have to get together with my Financial Advisor on that one

 

When the metal warms up it expands. The crack can not expand, so the crack closes. Then as long as the car is in use no water gets in to the combustion chamber. When it cools off the water again gets in.

 

Something like the SR-71 Blackbird fuel system.

At operational altitude and speed friction between the air and airframe generates so much heat that the SR-71 will expand by as much as 11 inches. As a result, the Blackbird's elastic fuel cells, which also serve as heat sinks once airborne, leak heavily on the ground but the seal areas close up when the whole thing heats up.

 

new plugs cap rotor, new motor oil . runs like a champ

 

The pilots have been known to cook hotdogs on the windows too!