Stop the smoking!

853 Views 11 Replies 7 Participants Last post by elcaminodragster, Feb 23, 2007

patch21

Discussion Starter · Feb 22, 2007

Just had my 350 rebuilt by a good shop in town makes the second time its been done! no matter what i have done i cant get it to stop smoking at idle! i put the intake on myself and a new 750 edelbrock. i have thought that it was running really rich, mostly because the exaust smells very strongly of gas. but it is a greyish white smoke? could the intake be leaking? running rich? heads are completely repurbished! runns great but enventually starts fauling plugs and keeps on puffin! im trying to learn and am not the dumbest rock in the yard but dammit to hell if i cant figure this out!

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baddbob

· #2 · Feb 22, 2007

How is the pcv routed/plumbed?

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xntrik

· #3 · Feb 22, 2007

Cylinder walls are probably the culprit. High vacuum is sucking oil past the rings.

The engine was probably too rich immediately, and glazed the cylinder wall surface.

Finish could have been incorrect for the type of rings,
or walls were not scrubbed thoroughly before assembly,

Glazing is often the combination of rich mixture and dirty/bad finish.

Except for the wall finish, it is definitely an assember-person problem.

First thing to do is correct the mixture problems to prevent future problems.
Second thing is to redo the cylinder walls and install new rings.

Since it is THAT RICH, all the other stuff probably doesn't apply.

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patch21

Discussion Starter · #4 · Feb 22, 2007

its a 4 speed muncie, and there is no pcv, just a breather, motor was built for circle track originally!

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docvette

· #5 · Feb 22, 2007

Doc here,

imp:

Try the easy stuff first..

Install a working PCV system.

Then Take the car up on the freeway, (assuming you have broke in the cam) and Hammer it ... then back it off to 65, 55, 45, 35...45, 55, 65..Hammer it again and continue for about 50 or so miles..Don't drive at a Constant speed, If it's a matter of rings sealing, that should do it.

Did it go in the SECOND time for the same problem? You might have a cracked casting at one of the Valve seats.

Doc

imp:

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pepi

· #6 · Feb 22, 2007

patch21 said:
Just had my 350 rebuilt by a good shop in town makes the second time its been done! no matter what i have done i cant get it to stop smoking at idle! i put the intake on myself and a new 750 edelbrock. i have thought that it was running really rich, mostly because the exaust smells very strongly of gas. but it is a greyish white smoke? could the intake be leaking? running rich? heads are completely repurbished! runns great but enventually starts fauling plugs and keeps on puffin! im trying to learn and am not the dumbest rock in the yard but dammit to hell if i cant figure this out!

750 carb, fouled plugs, rich smell leads me to think the carb might be a tad big, gray smoke would be raw gas. Just where I would start checking, is the engine modified any, if not I see a carb problem

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killerformula

· #7 · Feb 22, 2007

this seems pretty clearly to be a carb problem. Do you have another carb you could try? Grey smoke is generally fuel, and considering its been rebuilt twice with the same results, the likelyhood is its a variable that hasn't been changed yet.

I've opened up my fair share of those edelbrocks. Many times I've seen a white, pasty corosion inside the bowls. I've seen it clog idle circuits, wouldn't surprise me if a float or a needle is stuck in the wrong position.

Got any holley carbs laying around?

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xntrik

· #8 · Feb 23, 2007

killerformula said:
this seems pretty clearly to be a carb problem. Do you have another carb you could try? Grey smoke is generally fuel, and considering its been rebuilt twice with the same results, the likelyhood is its a variable that hasn't been changed yet.

I've opened up my fair share of those edelbrocks. Many times I've seen a white, pasty corosion inside the bowls. I've seen it clog idle circuits, wouldn't surprise me if a float or a needle is stuck in the wrong position.

Got any holley carbs laying around?

K

K,
You suppose that is mostly water corrosion, or chemical junk in the fuel that is attacking the metal? Never really noticed it down here.

Do you guys use 10% alcohol (E-10), MBTE, or anything like that up in your area? We don't have any of that stuff here.

thanks, x

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killerformula

· #9 · Feb 23, 2007

Can't say where it comes from because usually I buy the carb used from swap meets and such and don't know a whole lot about its life. Could be shelf sitting, could be just age and condensation (cold temps in the north + car sitting all winter?) I will say the material that an edelbrock is made from (the aluminum) seems more vulnerable in my experience.

K

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patch21

Discussion Starter · #10 · Feb 23, 2007

thanks for the help, i also am running the stock hei, just got in an msd streetfire today and the tune kit for the carb, im going to try jetting it down, and maybe change the step up springs, and open the gap up alitle on the plugs! if that doesnt fix the prob have no choice to yank it out again. nothing looks worse than a smoking engine(in my opinion) especially as nice as the truck looks. thanks guys i will update after i do some tinkering!

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baddbob

· #11 · Feb 23, 2007

I've also seen some major problems with idle fuel mixture on the Edelbrock carbs if the mixture screws were turned in and seated hard-they never adjust right after that.

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elcaminodragster

· #12 · Feb 23, 2007

Jmark said:
If you have an automatic trans, crawl underneigh and pull the vac hose going to the modulator and see if any tranny fluid drips from the modulator or hose. If you find ANY in either, change the modulator. I could be sucking tranny fluid.

Which cylinders are fouling plugs? If the PCV is sucking oil, #'s 2 and 3 will most likely suffer first from oil or ash deposits.

im havin a prob with my #2 and #3 burnin oil. its a bran new pvc valve. would runnin the motor without the pvc be ok???

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