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Old 07-11-2011, 12:06 PM   #1
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Default Intake Manifold Gasket

Since we added a RSX to the garage recently I've been messing with it a good bit. A ton of people do a Hondata intake manifold gasket to reduce intake temps. It looks like Hondata offers them for a miata but I've never heard of anyone doing it.

I did some primative before and after tests with the RSX and the gasket showed some significant drops in temperature on the manifold itself (no idea how that translates to the air inside, but it has to help). Here's the writeup I did on clubrsx:

I took some before and after temperature readings from the intake manifold to see how the gasket would affect manifold temps. All tests were done mid-day in south FL, similarly hot as hell for all 4 tests (2 before, 2 after) on a type S with only raceheader, no other mods, after 15 minutes of spirited driving.

Temperatures were taken from 3 points that were marked on the manifold and taken with a infra-red temperature gun to prevent any skewing of the experiment. Sample points are seen below:

Before temperatures:
Point 1: 157, 159
Point 2: 138, 140
Point 3: 137, 137

After temperatures:
Point 1: 144, 146
Point 2: 132, 133
Point 3: 131, 131

Temperatures close to the head were down 11-13 degrees. Farther away from the manifold temperatures are less drastic (as expected), 6-7 degrees. The test made me curious what kind of difference would be seen where the manifold mates to the head, I'd expect an even wider margin in the results there.
I think I'm going to do one on the miata as well. It doesn't look like the miata manifold has nearly as much surface area as the K20 so maybe it won't make much difference. If nothing else it will move the throttle body/charge pipes out 1/8" and give a little more room for the radiator hose. Just curious if anyone else has done one before?
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Old 07-11-2011, 12:11 PM   #2
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This test suggests that the head transfers a small percentage (~5-10%) of heat to the IM. 90% of it's heat is logically recieved through radiation within the engine bay. So, eventually, all the temps will still equalize to the temperature of the engine bay.

however, the heat that was being shed out of the head into the IM is now going to have to transfer into the oil and cooling system...

If you could measure a 10% drop in intake air temps through use of the gasket, I'd be slightly impressed.
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Old 07-11-2011, 12:43 PM   #3
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I have one of those. My OEM one tore when I was swapping intake manifolds, so I bought the phenolic and a OEM. Ended up using the phenolic for the reasons that is is thicker, much stronger and will certainly be reusable (I hope).

I never recorded temps.
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Old 07-11-2011, 12:54 PM   #4
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I have the hondata gasket on my car. who knows if it works. but it does **** up the alignmet of the IM support bracket bolt holes.
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Old 07-11-2011, 01:35 PM   #5
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Originally Posted by y8s View Post
it does **** up the alignmet of the IM support bracket bolt holes.
I thought everyone just threw those things away the first time they changed the oil anyway.
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