A Question for the /6 guys., Noises Options

[Allan]

I have a new(?) /6.. 2.7 w/big 46mm carbs. Couple of pumps on the gas and vrooom. Let it sit there and idle and it's mmmmnmm pop mmmm pop pop mmmmmmmmmm pop mmmmmm pop pop w/little black spots ending up on my driveway.

The wife hates it...

Head/Cylinder leak???

[SLITS]

black spots under the engine


or

black spots where the exhaust exits?

[Allan]

QUOTE (SLITS @ Nov 20 2005, 06:21 PM)

black spots under the engine or black spots where the exhaust exits?

Black spots where it is shooting out of the exhaust...

[sixnotfour]

Have you went to the pmo info site , faxed richard , you need smaller everything, document your jet and venturi sizes first.
Wife Hates is a bad sign. Carbs are not for everyone. http://www.pmocarb.com/support.htm
Better hope its not a head leak, probably popping out the exhaust due to over rich condition
Good Luck

[Allan]

I've checked into the PMO carbs but that's not the problem.. The carbs I have are just too plain big...

The concern I have is the sound I get from the exhaust Possible exhaust leak).

I'm gonna figure out a way to digitize the sound and let everyone here it...

[Allan]

QUOTE (sixnotfour @ Nov 20 2005, 06:27 PM)

Have you went to the pmo info site , faxed richard , you need smaller everything, document your jet and venturi sizes first.

Yes...

I hear that Richard has become very reclusive...

[J P Stein]

First thing is that it's not unusual for a cold carbed motor to pop out the stacks or taill pipe. The black marks are also not unusual.....carbon & water from condensation in the headers
Or oil that has leaked past the rings or guides while the motor has sat. The former is OK, the latter is worth looking into. Is it oil or water....clue, one drys up.

If it's popping out both ends, it's probably carb tuning or (less likely) ignition. Out the throats is lean. Out the exhaust is often rich....Need more info....which end?
(edit)
Humm....I type slow
(re edit)
That young fella Slits is even slower (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif)

[sixnotfour]

I was not implying you need PMO's simply that richard could help you jet those thing down so it will run properly ,without buying new carbs or 40's. He is the weber/PMO conversion King.

QUOTE

Yes... I hear that Richard has become very reclusive...

Oh (IMG:http://www.914world.com/bbs2/html/emoticons/ph34r.gif)

[SLITS]

Allan, as Dan stated in the earlier thread (or someone stated), "S" cammed engines are set to run rich a low speed. If the fuel is not getting burned (rich mixture) fully, it soots up the exhaust. Add water or excess fuel to the soot and wella....black spots on the driveway (and if ya punch it..on the person's legs standing behind the exhaust.

Put yer finger in the spot and see if it just wet soot..

The pop...pop...pop could be the plugs clearing themselves, carbon doing a preignition thingy in the cylinder, unburned fuel igniting in the exhaust piping..

As far as a cylinder leak...if you ever heard a VW going down the street with a pulled head stud, you will never forget that sound.

After your engine is heated up and you've given it a couple of 5K "blow outs"...do you still have black thingys coming out?

While Slits is an asshole, Ron can be a nice guy....I have a set or 40 IDA 3Cs off a '68 T that you could possibly try. It should lean it out a shitpile.

[Trekkor]

You need 40's.

I think people run 40's up to 3.0's


KT

[sixnotfour]

That motor is an 77 S ,CIS injected, originally . not to be cofused with early more radical S cams.carbs,mfi

[Allan]

QUOTE (trekkor @ Nov 20 2005, 06:36 PM)

You need 40's. I think people run 40's up to 3.0's KT

(IMG:http://www.914world.com/bbs2/html/emoticons/agree.gif) Trekkor you got it nailed!!!

I just worry about the freakin weird sounds that I get.

I'm gonna record a sample clip for everyones amusement ... (IMG:http://www.914world.com/bbs2/html/emoticons/dry.gif)

[messix]

if i remember right.
dan wasn't able to get ahold of a sycrometer to adjust those carbs. he just tuned it by ear. sounds like the idle needs to be tuned with the sycro.

when he took me for my ride was only the 2nd or 3rd time out with those carbs.

[sixnotfour]

QUOTE

QUOTE (trekkor @ Nov 20 2005, 06:36 PM) You need 40's. I think people run 40's up to 3.0's KT   Trekkor you got it nailed!!! I just worry about the freakin weird sounds that I get.

Thought you knew that from Pelican, Should trade with the guy that offered you cash and 40's.

Sorry it was foggy all day up here (IMG:http://www.914world.com/bbs2/html/emoticons/wacko.gif)

If you do get 40.s this should be close
32mm venturi's ,135mains,180aircorrectors,60idles,F3immulsiontubes

[DanT]

40s are the way to go. I had them on my very robust 2.7L RS motor. Worked great. None of the problems you are reporting.
46s are way too big.

[Seaside6]

Dirty jets will steal your engine's joy. Before making any changes I would try removing each of the jets and blowing compressed air through the jets and the throttle body hole the the jets come out of.

My 2.5L short-stroke was running rich and popping like crazy. A friend told me about this compressed air trick. My car immediately ran better but these symptoms would return after a few days. After a couple of months of every few days cleaning I took the fuel tank out and had it cleaned at a radiator shop. I have never had another problem and that was a year ago. My car has run great ever since.

It will take you about 10 minutes to find out if this helps your problem.

[Allan]

Just got a call from Richard at PMO. He said that I'll never get 46's to run right on a 2.7 unless it's a race motor running 190+ compression. He recommends going to 40's for optimum tuning.

[sixnotfour]

That confirms it , you owe some (IMG:http://www.914world.com/bbs2/html/emoticons/beer3.gif) (IMG:http://www.914world.com/bbs2/html/emoticons/beer3.gif) (IMG:http://www.914world.com/bbs2/html/emoticons/beer3.gif)

QUOTE

If you do get 40.s this should be close 32mm venturi's ,135mains,180aircorrectors,60idles,F3immulsiontubes

here is the guy

QUOTE

I guess you don't have PM's set up on your profile. Give me a call or e-mail, I'm interested in trading my 40's plus cash for your 46's. -Andy Simpkinson 707-449-8774

This post has been edited by sixnotfour: Nov 21 2005, 06:28 PM

[Mike D.]

Ah that sound...mmmmmmmmmpopmmmmpop pop mmmm, I know it well.....
I have a 2.0 6 with 40s, 135s and 55s. I only get poping crusing in the mid range. But I'm running a MSD6al so at idle I've got extra spark to keep from fouling. I sould probably step down all my jets, e tubes, chokes...

[Eddie914]

Alan,

46 IDA Webers are a bit big for a 2.7 S CIS engine. I have been running 40 IDA Webers on the same eingine with 32mm venturies as per Richard's (PMO) recommendations and they run great.

Would you like to trade?

Eddie