Thread: incredibly hot engine bay temps, need advice or suggestions 41 Willys 350, pics insid

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Originally Posted by 1923tbucket

Good question I forgot to mention that. On the bed cover there are vents built into it. You can see them here in the middle of the to tonneau cover.

You say

Since I'm using less fuel I'm noticing that the truck tends to run a little warmer even on cool days....

which seems to say that it may not be different than it was before the carb change, but that you're noticing the operating temperature more now that you've got it running better?

Mike's right, some actual measured temperature data would help, but I think your problem is that tonneau. We can't see the details of the louver/vent cover, but from the picture it appears to have very small openings compared to the area. Without calculating the effective free area of your louver I'd bet that you're getting about 25% of the rated free air flow (CFM) of your fans, and maybe much less than that. In effect, it looks to me like you're bottling up the air beneath the tonneau cover, stifling air flow. The first thing I'd try is removing that black panel (if you can) and see what effect that has on your problem. If that solves it then your task is to come up with a louvered panel that has sufficient free area to move the volume of air your fans put out, with as little restriction as possible but still maintaining a "look" that you find acceptable, like maybe a sheet of aluminum or steel with rows of punched louvers. When you look at the rated flow of your fans and the necessary free area, you may find that you need to make that panel larger. Whatever you do don't add pusher fans to the pullers, or you'll further restrict the air flow even more.

Originally Posted by rspears

You say which seems to say that it may not be different than it was before the carb change, but that you're noticing the operating temperature more now that you've got it running better?

Mike's right, some actual measured temperature data would help, but I think your problem is that tonneau. We can't see the details of the louver/vent cover, but from the picture it appears to have very small openings compared to the area. Without calculating the effective free area of your louver I'd bet that you're getting about 25% of the rated free air flow (CFM) of your fans, and maybe much less than that. In effect, it looks to me like you're bottling up the air beneath the tonneau cover, stifling air flow. The first thing I'd try is removing that black panel (if you can) and see what effect that has on your problem. If that solves it then your task is to come up with a louvered panel that has sufficient free area to move the volume of air your fans put out, with as little restriction as possible but still maintaining a "look" that you find acceptable, like maybe a sheet of aluminum or steel with rows of punched louvers. When you look at the rated flow of your fans and the necessary free area, you may find that you need to make that panel larger. Whatever you do don't add pusher fans to the pullers, or you'll further restrict the air flow even more.

I havent done any kind of testing really as far as temps there, however i am looking to do something to promote some air flow into that engine bay for sure. AS far as the fans in the back im going to look into a shroud of some sort, they kick out some serious air.