Exhaust temperatures

On my blown alcohol combo I was told 1200 degrees was the max. exhaust temperature before doing any damage. This weekend with a nostalgia fuel car I saw exhaust temps in the 1500 range and was told it could go as high as 2000 degrees before doing any damage. Both cars have the same computer systems with the same exhaust probe configurations. What gives

 

whwt fuel were they running?

 

85% nitromethane

 

It's just the manner of the fuel difference. Nitro burns much hotter and slower than alcohol and that has more to do with the EGT's than anything, i.e. the mix is still burning as its leaving the combustion chamber.

 

Thanks Justin. I kinda figured it had to do with the difference in the fuels and the way they burned.

 

we have seen temps above 1200 on our blown alcohol chevy , but that was running too fat and the fuel was getting hot in the header pipes , we were reading the plugs just like Mike told us to do , so we could figure this out.

A guy I know was continually fatening his tune up based on the EGTs , and not reading his plugs , he was getting slower and hotter EGTs.

 

on my nostalgia nitro funny car that i ran i would see exhaust temps in the 1700 to 1900 range. we ran 88-92 in the tank.

 

Thanks Mike. I am not going over 1200 degrees in my blown alcohol combo. I was just surprised that a nitro deal would run that much hotter.