question about timing and mufflers ?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rddaves54 · 01-11-2010, 07:00 PM

I had to take my truck back to muffler shop today to have it checked out and the gaskets were burned out where they connect to exhaust manifolds. He told me the timing was off and running hot. He said that because of that the gaskets burned away and the galvanized pipe had the galvanize burn off as well up near the manifolds. It has been two months the pipes have been on.

Has anyone ever heard of that?

I set timing today at 8% and the RPMs at 600. It seems to be running better. When I took air breather off the top of carburetor it was black would timing cause this or do I need to adjust the carbs?

GREASEMONKEY72 · 01-11-2010, 07:09 PM

i dont think ive ever heard of that before

cdowns · 01-11-2010, 07:14 PM

if a motor is running lean and not timed right ,i've seen manifolds and exhaust pipes golow cherry red

you say carbs tuned?? does that mean you're running multicab setup?

Sinister · 01-11-2010, 07:15 PM

If your timing is retarded, exhaust will run hot.

GREASEMONKEY72 · 01-11-2010, 07:27 PM

that is true if its to lean it will run hot

rddaves54 · 01-11-2010, 07:29 PM

No, only one carb but I was not sure what made top of carb black.

That means it was getting too much fuel right?

GREASEMONKEY72 · 01-11-2010, 07:37 PM

what part of the carb is black?

the top outside or inside under the choke plate?

Hubscrub · 01-11-2010, 07:48 PM

Quote:

Originally Posted by rddaves54

No, only one carb but I was not sure what made top of carb black.

That means it was getting too much fuel right?

lean is its not getting enough fuel, to much fuel is called running rich

rddaves54 · 01-11-2010, 07:58 PM

the top outside of carb and around on the inside of the air breather holder.

Hubscrub · 01-11-2010, 08:18 PM

Quote:

Originally Posted by Hubscrub

lean is its not getting enough fuel, to much fuel is called running rich

sorry, i might have misunderstood you, i don't want to sound like a smart butt, i think i see now

you was talking about the black on the carb, has it backfired through the carb? it has turned my air cleaner underside black when my truck has done it

Tkmadone · 01-13-2010, 06:09 PM

Sinister is correct, retarded timing causes unburned gas to continue burning as it is going out the exhaust, which heats it up considerably.

The lean thing is a misconception. At stoichiometric mixture, meaning there is the perfect amount of gasoline to burn all the oxygen in the cylinder, it burns hottest. Any richer or leaner it will be cooler than that.

At very high power settings, like going up a long hill, it can be beneficial to run a little rich to keep things cool. At cruise, where power is low, you can run quite lean with no ill effects.

01-11-2010, 07:00 PM	#1
rddaves54 Registered User Join Date: Nov 2008 Location: Columbia SC Posts: 231	question about timing and mufflers ?? I had to take my truck back to muffler shop today to have it checked out and the gaskets were burned out where they connect to exhaust manifolds. He told me the timing was off and running hot. He said that because of that the gaskets burned away and the galvanized pipe had the galvanize burn off as well up near the manifolds. It has been two months the pipes have been on. Has anyone ever heard of that? I set timing today at 8% and the RPMs at 600. It seems to be running better. When I took air breather off the top of carburetor it was black would timing cause this or do I need to adjust the carbs? __________________ Chief mechanic for my, 54 Belair, 64 Corvair, 72 C/10Fleetside and 2002Tahoe. John 14:6 Jesus said, "I am the way, the truth, and the life. No one comes to the Father except through Me. My Book "Why Cancer is Not Bad Luck" by WestBow press

01-11-2010, 07:09 PM	#2
GREASEMONKEY72 Registered User Join Date: Aug 2006 Location: Bakersfield,CA Posts: 7,893	Re: question about timing and mufflers ?? i dont think ive ever heard of that before __________________ -steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME

01-11-2010, 07:14 PM	#3
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: question about timing and mufflers ?? if a motor is running lean and not timed right ,i've seen manifolds and exhaust pipes golow cherry red you say carbs tuned?? does that mean you're running multicab setup? __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

01-11-2010, 07:15 PM	#4
Sinister Between Trucks... Join Date: Mar 2002 Location: Los Angeles, CA. Posts: 3,830	Re: question about timing and mufflers ?? If your timing is retarded, exhaust will run hot. __________________ Beat it to fit, Paint it to match...

01-11-2010, 07:27 PM	#5
GREASEMONKEY72 Registered User Join Date: Aug 2006 Location: Bakersfield,CA Posts: 7,893	Re: question about timing and mufflers ?? that is true if its to lean it will run hot __________________ -steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME

01-11-2010, 07:29 PM	#6
rddaves54 Registered User Join Date: Nov 2008 Location: Columbia SC Posts: 231	Re: question about timing and mufflers ?? No, only one carb but I was not sure what made top of carb black. That means it was getting too much fuel right? __________________ Chief mechanic for my, 54 Belair, 64 Corvair, 72 C/10Fleetside and 2002Tahoe. John 14:6 Jesus said, "I am the way, the truth, and the life. No one comes to the Father except through Me. My Book "Why Cancer is Not Bad Luck" by WestBow press

01-11-2010, 07:37 PM	#7
GREASEMONKEY72 Registered User Join Date: Aug 2006 Location: Bakersfield,CA Posts: 7,893	Re: question about timing and mufflers ?? what part of the carb is black? the top outside or inside under the choke plate? __________________ -steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME

01-11-2010, 07:58 PM	#9
rddaves54 Registered User Join Date: Nov 2008 Location: Columbia SC Posts: 231	Re: question about timing and mufflers ?? the top outside of carb and around on the inside of the air breather holder. __________________ Chief mechanic for my, 54 Belair, 64 Corvair, 72 C/10Fleetside and 2002Tahoe. John 14:6 Jesus said, "I am the way, the truth, and the life. No one comes to the Father except through Me. My Book "Why Cancer is Not Bad Luck" by WestBow press

01-13-2010, 06:09 PM	#11
Tkmadone Registered User Join Date: Aug 2009 Location: Simi Valley, CA Posts: 193	Re: question about timing and mufflers ?? Sinister is correct, retarded timing causes unburned gas to continue burning as it is going out the exhaust, which heats it up considerably. The lean thing is a misconception. At stoichiometric mixture, meaning there is the perfect amount of gasoline to burn all the oxygen in the cylinder, it burns hottest. Any richer or leaner it will be cooler than that. At very high power settings, like going up a long hill, it can be beneficial to run a little rich to keep things cool. At cruise, where power is low, you can run quite lean with no ill effects.



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