zuckerwar
Maryland
Full Member
Joined: 06/11/2005
View Profile
 Offline
|
This is a strange phenomenon. Due to overheating issues, I've just done a lot of work on my 1988 carbureted 454 including removing the a/c system and replacing the water pump, fan clutch, distributor and ignition coil.
Here's my problem: the exhaust from one of my mufflers is piping hot; the other exhaust is just warm. What could cause one side to run so hot compared to the other?
Thanks.
1989 Shasta Roadmaster
36' Class A with tag axle
454 Chevy 7.4l
|
nelson
Clio,Mi USA
Senior Member
Joined: 07/01/2002
View Profile
Offline
|
Is the butterfly still in the RT side Manifold. If so it might be stuck closed.
2002 Damon Challenger 348 Ford V10
Blue Ox Auto Stop and Aventa II Tow Bar
2001 Ford Sport Trac with Remco Driveshaft Disconnect
|
zuckerwar
Maryland
Full Member
Joined: 06/11/2005
View Profile
Offline
|
Hi Nelson -
What butterfly? I've never heard of this.
There is exhaust coming out of the right side, it's just that it's warm as opposed to the left side which is very hot. This is after starting the engine from cold and idling for 5 minutes or so.
|
dhamblet
Olympia, WA
Senior Member
Joined: 01/13/2005
View Profile
|
I suspect a stuck heat riser valve. I think on the 454 there is a flapper valve in the exhaust thats closed when the engine is cold and is supposed to open when warm. It forces the exhaust or at least part of it thru a channel in the intake manifold to warm the engine quicker.
2005 Dutchmen 35SRV, Pergo floor, 5th Airborne, JT Strong Arm, Kodiak Disk Brakes, Backup camera
2006 Dodge CTD RAM QC 3500 LWB 4WD, Reese 16k, Airlift, Pacbrake, Britebox, 60g aux fuel tank
04 HD Ultra, CanAM 400MAX Quad
Spending my kids inheritance
|
TheRealTaxman
Jacksonville, FL
Full Member
Joined: 01/10/2007
View Profile
Offline
|
Now is the time to replace your stock exhaust manifolds with a good set of coated headers. There are many benefits to be seen, including cooler operating temperatures.
Search the forum -- you'll get plenty of advice.
|
|
|
bingoldsby
Oregon State Parks - somewhere
Senior Member
Joined: 10/22/2006
View Profile
Offline
|
TheRealTaxman wrote:Now is the time to replace your stock exhaust manifolds with a good set of coated headers. There are many benefits to be seen, including cooler operating temperatures.
Zuckerwar,
I've just done that on my 1987 454 last week. I wish I could tell you how much of an improvement in all aspects I've gained..., but I can't, as I haven't driven it anywhere but back to the Oregon state park where I'm hosting. I'm very confident that The Taxman (shudder) is really on to something. Previous to that, I had increased all the exhaust tubing from 2" to 3" and had a set of Magnaflows added (and subsequently had a set of 30" glass packs put in ahead of the Magnaflows - to cut down on the muscle-truck sound.
I've also removed the dash AC condenser from in front of the engine radiator (leaving the rest of the ac system in tact.) That made the biggest improvement in the engine running temperature on hot days pulling up hills. I provided a 4" fresh air duct up to the grill for the engine's air intake, and replaced the big fan clutch (dubious if it works right still).
This all has nothing to do with a difference in manifold temperatures, but just an agreement on what you did otherwise.
Brian K7ZRZ
Campgrounding hosting - Oregon State Parks
1987 30' Holiday Rambler Class A
GL1800 Goldwing - Honda Scooter Mounted
2000 Silver Miata LS Toad
Picture taken at Salem, Oregon
|
nelson
Clio,Mi USA
Senior Member
Joined: 07/01/2002
View Profile
Offline
|
The heat riser valve is what I was referring to, It is between the manifold and exhaust pipe
|
Daveinet
il
Senior Member
Joined: 10/29/2003
View Profile
Offline
|
Ultimately, if you have not been able to resolve your overheating issues, you may need to replace the radiator. If the radiator is original, it likely has lost its ability to transfer heat. The fins get so they no longer conduct to the internal tubing, and the radiator looses efficiency. You may also need to look at timing and fuel mixture. Running too lean will definently make it run hot. All of this has nothing to do with your specific question. And yes headers will make everything cooler as well.
Dave
FMCA F298817
'83 Revcon Prince 31' FWD
502 w/Thorley's & Magnaflows,
Howell/Edelbrock MPFI, Koni FSD,
Class A built for gear heads 
My Revcon Website
Revconeers Forum
XP activation frustration
|
hottubkid
SCHAUMBURG,IL
Senior Member
Joined: 12/29/2004
View Profile
Offline
|
iS THERE A MANAFOLD LEAK?
hottubkid60193@yahoo.com
2004 SOUTHWIND 36E Tow 2003 CRV
|
427435
Rochester, Mn
Senior Member
Joined: 11/12/2005
View Profile
Offline
|
The stuck heat riser valve (that you likely have) is also part of your overheating problem.
Mark
2000 Itasca Suncruiser 35U on a Ford chassis
2003 Ford Explorer toad with US Gear brakes,
ReadyBrute tow bar, and Demco base plate.
|
|
|
