Re: Exhaust Manifold Temperatures
I once did a stupid kid trick, but learned something about exhaust temps as a result; I ran my 292 57 race engine w/o the manifolds on just for kicks, blipping the quads wot a number of times. What I saw was a variation in flame color that told me (based on my gas stove experience), cylinders #4 and #6 were running lean in comparison to all the others. When I looked at the dual quad manifold with the carbs off, I could see that the cross cuts were designed in to apparently address the condition, but were probably still not adequate to feed those two cylinders. Taking my Que from that, I cut cross cuts in five 1/4" fiber insulator blocks to go under each carb to build up more manifold area to these cylinders, put in longer studs, and remounted the carbs for a second test. Wa La! All cylinders the same. I probably told this story once before on a similar thread, but oh well. BTW, the engine was in a 57 post chevy so hood clearance was not an issue.
Stu Fox
I once did a stupid kid trick, but learned something about exhaust temps as a result; I ran my 292 57 race engine w/o the manifolds on just for kicks, blipping the quads wot a number of times. What I saw was a variation in flame color that told me (based on my gas stove experience), cylinders #4 and #6 were running lean in comparison to all the others. When I looked at the dual quad manifold with the carbs off, I could see that the cross cuts were designed in to apparently address the condition, but were probably still not adequate to feed those two cylinders. Taking my Que from that, I cut cross cuts in five 1/4" fiber insulator blocks to go under each carb to build up more manifold area to these cylinders, put in longer studs, and remounted the carbs for a second test. Wa La! All cylinders the same. I probably told this story once before on a similar thread, but oh well. BTW, the engine was in a 57 post chevy so hood clearance was not an issue.
Stu Fox
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