Fuel in exaust, at wits end.

[talentfreak]

Ok here is what I have done so far to my small block chevy to try and fix this problem. First I was fouling plugs and way too much exhaust in the exhaust, strong smell, burning eyes. I called up Crane and got a cam with matching lifters (Adv. Duration: 290º Gross Lift: .454'' RPM Range: 2000-5000 Cam & Lifter Kit ), and springs, new MSD ignition, New Mallory Ignition, New Intake (Weiand) I did however forget to take out the divider plate which I am going to do later today, it is X-CELerator, 1500-6000 rpm part number 925-7546 from Jegs, I also have a new Edelbrock 750 carb, we have not set the timing with a timing light only by ear, I drove it down the road yesterday and it ran awesome, but still smoke with a definite fuel smell? I don't know what else to do? Should I take it somewhere and have them tune it in for me? What else could it be?:confused:

[dq409]

What fuel pump are you using ? You could be running to much pressure ,,,,dq

[talentfreak]

The fuel pumb is a holley, the guage says 4 lbs. we took it down as low as 3lbs., still same problem, now some times when we tap on the regulator it would jump up to 14 lbs., but it usually stays at 4 lbs.

[jim_ss409]

If you have less vacume than your carb was calibrated for (big cam) the metering rod springs will be too strong. This would alow the metering rods to dump fuel in at an idle and generally cause the engine to run rich. If it's a new carb you've got it would have come with a book explaining how to set it up. It's not the easiest thing to read but it does explain things pretty well. I think you can get metering rod spring kits at a speed shop or from Edelbrock of course. They are easy to change. Calling Edelbrocks tech line, if they have one, might also be worthwhile.

[dq409]

I would say your regulator is bad. If "you tap it and sometimes it jumps to 14 LBS." it`s bad. It sould stay at what ever it is set at.
At 14 LBS it will push by the needle and seat and flood the carb. Setting it at 6-7 lbs should be fine for that carb. If it`s new return it for a new one,,,,dq

[bbqcruising]

FIRST, LIKE IT WAS ALREADY MENTIONED,CHECK THAT WACKY FUEL REGULATOR. IF YOUR TIMING IS REALLY RETARTED THE GAS IN THE COMBUSTION CHAMBER WILL REMAIN UNBURNED AND PASS TO THE EXHAUST SYSTEM GIVING YOU THE GAS SMELL. YOU SAID YOU CHECKED IT BY EAR. BORROW A TIMING LIGHT.:D

[dq409]

OUHHH,,,I missed that !! Gezzzzzz,,,,,get that timimg light on it and set it proper !!! By ear can be WAY off and still run !!
BTW,,,When you installed the cam did you degree it with a wheel or just install it,,,,dq

[talentfreak]

Got the timing set (with a light this time, and set with the block) not much of a change yet, seems a little better, but the plugs are fouled again (3rd set) going for the 4th set Thursday, then we are going to see if we need to jet the carb down.

Cam was just installed.

[dq409]

You should ALWAYS degree your cam when installing. I`ve seen them off as much as 14*,,,,,,,,GET THAT NEW PERSSURE REGULATOR !!!!,,,,,dq :cuss

[talentfreak]

I had a guy come over that owns a performance shop near where I live and set the timing and he took the pressure regulatar apart, said that it was common and messed with it for a few minutes put it back together and it didn't seem to do it again.

[talentfreak]

I finally did a compression check (Needed the pressure checker), so how about a show of hands who believe that this motor has way too low compression at less that 8:1 more like just 8? A couple people have told me already that this is my main problem that my compression is just way too low?

[dq409]

How did you figure your compression with a compression guage??? :confused: ,,,dq

[talentfreak]

Yes with a compression guage.

[SS425HP]

This one I'm waiting to hear about. Ought to be interesting.

Fred

[IgnitionMan]

One question about the compression test...what throttle plate position in the carb(s) was used for the test?

What is the oil level on the dipstick?

Clue, these aren't a trick, sarcastic or humerous questions.

[talentfreak]

Ok now you are just getting over my head, I am just a beginner learning as I go along I had someone from a speed shop come over and hook up a guage to the spark plug holes and tested them, tested each side and came up with 8 to 1.

[dq409]

All a compression check will do is give you an idea on how well your combustion chamber (rings, vavles) are sealing. you can get some what of an idea of compression but not exact,,,,dq

[IgnitionMan]

First, there is NO way you can do a compression check and come up with a compression ratio, unless the engine parameters are known. The only way this works is with the parameters known, as in this pressure for that horsepower engine, like 327/250 horse, 160 psi, 10.00:1 c/r, etc.

Now, for the questions I asked,

Was the compression check done with the carb held wide open? If not, the reading will be lower than what the engine has, simply because the engine couldn't get the air through itself from no opening. Carb has to be wide open for compression tests, same with throttle body on EFI engines.

What oil level on the dipstick? Did/does the engine "manufacture" oil? Does the oil level get higher? If so, fuel is getting into the lower end, most likely place would be through a leaky fuel pump diaphragm. Just another place to check, because fuel in the lower end casn come through the PCV system, rings/valve guides, etc., and smoke right out the exhaust system.

[jim_ss409]

I guess they might have been able to guesstimate your CR by the readings they got but they would have come up actual PSI numbers like 140, 150, 160 or so. Did they tell you what they were? Cam size will affect cranking compression because a big cam won't close the intake valve untill the piston is part way up on it's compression stroke. This bleeds off compression and reduces low rpm power but at higher rpm's it alows more time for the cylinder to fill, increasing power. Generally speaking low compression and a big cam don't work well together. The engine will be lazy at low rpm's. But the cranking compression PSI numbers should tell you if you're in the ballbark. If they told you what they were post them.

[talentfreak]

The compression was at 90 psi

[IgnitionMan]

With the carb wide open, or closed??

[talentfreak]

Sorry, wide open was about 120 psi.