what would cause a glowing exhaust manifold?

 

a **** load of heat, duh

 

lol... but why so much foo?

motor was rebuilt 6 months ago, and has a 3 month old catalytic convertor.

 

Clogged cat, running REAL lean or REAL rich... or your ignition timing being retarded WAYYYYY too much

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Devlins 91LS &raquo;</TD></TR><TR><TD CLASS="quote">Clogged cat, running REAL lean or REAL rich... or your ignition timing being retarded WAYYYYY too much</TD></TR></TABLE>

thanks... I'll check it out. o2 probably?

 

Ya mean like this?

 

yup.... but no snail.

 

geezus thats what i call glowing..

 

I've never seen anything like that! How often does this sorta thing happen?

 

dam ive seen some glowing manifolds but not like that

 

even with a good tune, run a turbo motor flat out for a half our and your manifold will turn a little orange.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Philip &raquo;</TD></TR><TR><TD CLASS="quote"> I've never seen anything like that! How often does this sorta thing happen?</TD></TR></TABLE>That's not my picture, so I don't really know the story. When I saw this thread it reminded me of it...

It's a Saab 900, mid-to-late '80s. It must be on an engine dynomometer. There's an empty flange face in the photo above the down pipe - that's where the right drive axle goes. So this is obviously not installed in a car. Besides, you'd see the fender, engine mount, & the firewall if it were in a car.

Probably getting off the topic. My posting that picture doesn't really help answer B Cruz's question. If it runs really rich you don't have air in the exhaust manifold to complete the combustion. Lean gives you higher exhaust temperatures, right? Besides, it has to run WOT for a while to get that hot.

So, B Cruz... Under what conditions does it glow? I kinda like the timing idea. Also what about valve timing?? Couldn't that do it too?

 

Valve timing won't do it, it'll just bog

And running real rich is gonna pour hella fuel into the cylinders, not be lit, then go down the header where its ignited by the cat. So its igniting in the exhaust, not the cylinder. Thats why runnin real rich'll do it.

Basically, you're a/f is whacked or your ignition timing is.

 

glogged somewhere

 

put it on a 5 gas analyzer and check your numbers, most likely running lean, which will show nox way up and O2 up.

 

your intake cam is retarded check your timing at the cams.

 

Way To Much V-Tec action, with yo heavy-*** foot. Take it easy on the gas pedal.