Dave Tuten

Hello all,

Under hood heat I think is extreme. After reaching 180 degrees I took exhaust manifold temps and got 600-625 on right side and 410-430 on left. Should there be that big a difference? There is no heat riser in line on right. So hot on right, you cannot keep hand on inner wall. Normal or no? If not any suggestions?

Thanks

MikeM

Since nobody else wants to step up.......................

Your left side sounds normal if the engine is idling and hasn't just been run hard. Your right side temps are definitely high.

Why? I don't know. How does the car run?

PS. I see you were confused a few years ago about how to time the engine. Did you get that nailed down? Slow timing will put a lot of heat in the manifolds.

SWCDuke

If total idle advance is in the proper range for the engine configuration (which you did not state), exhaust manifold temps should be no more than about 500F.

IR guns typically measure the average of a 4:1 cone, so be sure you hold the gun very close to the manifold surface so it doesn't detect the lower surrounding temperatures.

Early emission controlled engines with ported vacuum advance and very little initial advance increased EGT considerably to burn HC and CO in the exhaust system with injected air and exhaust manifold temps are typically about 900F.

Duke

hedgehead

Exhaust restricted on the right side?

DSR

Maybe the heat riser is not opening all the way? Does a '57 even have a heat riser in the exhaust?

Dave Tuten

Thanks for reply...Yep, still not sure about the timing...that may be the culprit as well as vacuum advance which I don't know about. Just need to take to auto shop for correct settings. However runs good and idles good, so I think...thx

Dave Tuten

Thx for reply...does not have a heat reisr...straight thru...thx