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Old 04-02-2005, 09:54 PM
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RPM/Airgap extra cooling bosses

I have an RPM/Airgap. I want to take advantage of the extra cooling potential of tying the front and rear cooling bosses together. I will require a Tee in the passenger side front boss for the heater hose.

The problem. The rear bosses are 1/2 in NPT and the front bosses are 3/4 in NPT. The 3/4 inch AN fittings cross to a #10 hose and the 1/2 inch AN fittings cross into a #8 hose.

I have also looked into using brass fittings. No matter what combination I use. I have to buy alot of adapters and/or bushings that will make the project look tacky.

With brass I have to use 5/8 inch rubber hose (tacky). With AN I could drop down to #8 braided but would send the project into the 100 + dollar range.

Anybody ever took advantage of this feature and how did you plumb it?
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Old 04-02-2005, 10:27 PM
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Rent a 3/4" pipe thread tap.

Larry
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Old 04-02-2005, 10:37 PM
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thought of that

I would cut too deep into the boss and weaken it.
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Old 04-02-2005, 11:20 PM
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Dang.

Try a reducer bushing in the front openings. Even if it was smaller than you needed it could be re-tapped to 1/2".

Larry
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Old 04-03-2005, 12:14 AM
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I found it.

Jegs carries a kit. It attaches to a plate under the thermostat. You don't have to hook into the heater bosses. I have a thermo housing with two 1/2" sensor holes. I will plum from the rear bosses to the housing. Can do it pretty cheap.
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