New Motor Red Hot Headers
#1
New Motor Red Hot Headers
I just installed a 355 in my 88 Firebird. I started it up yesturday and had it running for about 2 minutes when the headers start to glow red hot on both sides. They actually burnt a plug wire completely off. Could the timing be that far off that it would cause it to do this or do I have other problems. I don't think the exhaust is clogged because it is fairly new. Any suggestions would be helpful.
#4
Re: New Motor Red Hot Headers
Somethings causing it to run very lean. A lean fuel mixture will cause the exhaust temperature to get very hot. At an idle, exhaust temperature should be around 600*. At WOT, about 1300*. It sounds like your idle temperatures are probably above 1500* if the pipes are glowing red.
Check timing
Check for any major vacuum leaks such as the port for the vacuum brakes
Check fuel mixture
Running lean can cause a lot of damage. Melted pistons, burnt plugs, burnt valves.
Check timing
Check for any major vacuum leaks such as the port for the vacuum brakes
Check fuel mixture
Running lean can cause a lot of damage. Melted pistons, burnt plugs, burnt valves.
#5
Re: New Motor Red Hot Headers
The motor is a 355 TPI motor with AFR heads and a comp roller cam. I don't understand how it could be running lean with feul injection. I think the the timing is way too retarded which is letting the mixture continue to ignite in the headers. Im going to play around with the timing tommorow when i get my transmission back. Thanks.
#6
Re: New Motor Red Hot Headers
Originally Posted by FMFRacing88
The motor is a 355 TPI motor with AFR heads and a comp roller cam. I don't understand how it could be running lean with feul injection. I think the the timing is way too retarded which is letting the mixture continue to ignite in the headers. Im going to play around with the timing tommorow when i get my transmission back. Thanks.
- Justin
#7
Re: New Motor Red Hot Headers
No the car has not been tuned yet because i built the new motor then just switched out the stock 350 TPI motor with this one and haven't even had it on the road yet. I know tuning will help grealty for performance but will it still be drivable with the stock tune...I plan to get it dynoed tuned soon but will it be good until then.
#8
Re: New Motor Red Hot Headers
Originally Posted by FMFRacing88
No the car has not been tuned yet because i built the new motor then just switched out the stock 350 TPI motor with this one and haven't even had it on the road yet. I know tuning will help grealty for performance but will it still be drivable with the stock tune...I plan to get it dynoed tuned soon but will it be good until then.
As a side note, if you are looking for driveability, don't count solely on a dyno tune. Make sure that your tuner also takes the car out on the street to see how it behaves under normal driving conditions.
- Justin
#9
Re: New Motor Red Hot Headers
I had the same thing happen to my Superramed 383 when I put on a set of AFR 195's. First startup I noticed the headers glowing. I immediatley thought something was way off. I found I had a worn distributor gear and the timing was way off and the stock tune is not capable of supplying enough fuel for those heads. Like stated above check timing, get a chip done right away, we had to add all kinds of fuel!!
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