Thread: Holes in the hood

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Hey everyone, Wanted to pass this idea around and see what everyone thought. Like a lot of others here iam having a cooling problem, At driving speed the temp stays at 185. Idling it goes to 220. I have taken care of a lot of the prob by removing the pusher fan in front of the rad. I have an 18 inch flex fan on the water pump. No air conditioning. No fan shroud yet. I am planning on putting one on.

When i removed the pusher fan the temp only goes up to 200. Been thinking of putting three portholes like the old buicks had. They will be 2 and three quarter inch holes each. Iam posting pics so yall can get an idea of what i want to do. Thanks for
listening to my rambling. All advice will be appreciated. Don

First put the shroud on, and get your air flow through the radiator addressed. If you're still having a problem, then you might consider the port holes, but they will be more for looks than for function. If you have a properly sized radiator, proper t-stat, and a good shroud you should not have cooling problems.

Thanks Roger. First thing in the morning ill install the shroud. Then go from there.

This time of year 180 running, and 220 in traffic stop and go not all that far off. Dose the temp move down fairly soon after you get rollin? If so the system is working. Yes, a shroud is the ticket, you could tastefully hide an air damn up front even better.

You can expect the temp to be about 100 over ambient, the more water you have in the cooling mix gives better cooling also. Looks like this year is going to a hot one so temps will be on the high side, hell last two days 106, that's stout.

Maybe you could cut some holes in the fender liners?

Depending on how deep the shroud is going to be, remember that the fan need only be 3/4"-1" inside the shroud. If the fan is too far inside the shroud, it defeats the purpose of the shroud.

Originally Posted by choppedchevy

Thanks Roger. First thing in the morning ill install the shroud. Then go from there.

Saturday morning in Des Moines I stopped to get my Good Guys registration info, and when I lit off the '33 I hit the start button, but apparently failed to energize the "Acc" button - I have a two button start, relay based system. As I was idling around the fairgrounds trying to get to the Homebuilt Heaven area I looked down and noticed no gauges, and quickly noted that my ACC button was dark. I quickly hit the ACC button, and panicked when my Water Temp Gauge went to 240F with the ECU showing me water temp at the head of 248F - no fan running, idling in traffic. I watched the ECU display, and within less than a minute it was 231F, then continued to fall at a relative fast rate through 203F, then 192F still idling. My point is that if your components are sized right, with a good shroud that forces all of the fan flow through the radiator core then you should be OK without cutting holes in things. Sure, mine's a hiboy with no hood sides, but I think it's applicable.

Thanks guys for all the advice, i installed the shroud, i took it for a drive. It stayed at 195 the entire time. let it idle for 30 minutes no problem. I did put vents in the hood. After shut off the temp rose to 200 then cooled down fairly quick. A lot better then it has been. Again thanks everyone. Don