exhaust gas temp help

[hotrod1994]

how do i go about increasing or decreasing it if i lean it out some and increase the timing is it gonna go up
any info is appreciated
thanks logan

[oldandtired]

Both leaner mixture and increasing timing will increase exhaust temps.

[hotrod1994]

ok thanks

[maxpower671]

Both leaner mixture and increasing timing will increase exhaust temps.

not saying you are wrong but......

doesn't having the timing too late, retarded.....increase temps in the exhaust tract? instead of burning in the cylinder, the fire is started too late and is burning as the gasses are exiting..?

[Scooterz]

Maxpower has a point I think-

See previous thread Bruce commented on about Outlaws glowing header. Same principle. I too have seen this on circle track cars many times too (glowing headers)... I even had a similar problem with a XR400 dirt bike that ended up being too rich & made the header glow at idle. I think Bruce made a similar post then b/c I was making the problem worse... doing the opposite. He was right. His explanation even applies to the simplest of motors on a single cylinder motor cycle engine.

[Scooterz]

But then again maybe I am talking about two different things???

Exhaust temp VS late/ unspent gasses & ret timing??? I don't know... I am still learning. It would seem that lean & hot timing DOES also cause higher ext temp; but also a rich condition with lower timing can do it too... just by means of unspent fuel burning later in the ext tract.

[maxpower671]

how do i go about increasing or decreasing it if i lean it out some and increase the timing is it gonna go up
any info is appreciated
thanks logan

how about posting some info on your combination...and where you are in regards to tune...timing and your fuel delivery, etc..

[hotrod1994]

sbc
9:1
477/477 268 duration cam
torker intake
holley 750 witch is to big
some 1.94/1.5 heads stock besides springs and i had them milled to increase compression
:twisted: - logan

[maxpower671]

dear Logan,

sbc doesn't tell me much



cubic inch? bore n stroke please.......

[hotrod1994]

just a std bore 350 completely stock bottom end
not much to tell

[maxpower671]

sbc
9:1
477/477 268 duration cam
torker intake
holley 750 witch is to big
some 1.94/1.5 heads stock besides springs and i had them milled to increase compression
:twisted: - logan

i agree a smaller carb would be better...say a 650 Holley...play with the jetting...total timing usually is in the upper 30's degrees.. that's about it.. 8)

[hotrod1994]

ok thanks