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Posted by: motorvated Sep 10 2018, 07:02 PM

Switched over to a header/megaphone exhaust and quickly melted the stock white plastic pulley on the transaxle. Wrapped the headers and collector with fiberglass tape and installed a black delrin pulley, and promptly melted that one too. The collector sits very close to the pulley. I'm racing the car so things are getting pretty hot under there. Anyone have or know where I can get a metal pulley. I know that some were produced a while back, so if you have one in your parts stash that you won't be using, I could certainly use it. Thanks, Mike.

Posted by: 1adam12 Sep 10 2018, 11:01 PM

You may want to look into some heat deflector sheets in the meantime. Either DEI or DCI will have some heat reflective material with adhesive backing that you could custom form to the back housing of the cable pulley housing and then use a heavy duty formable reflective sheet on the face exposed to the headers like a cover. You'll have to tin cut it to shape and then use safety wire to attach. Not the prettiest solution but could get the job done until you find an aluminum pulley wheel.

Posted by: mb911 Sep 11 2018, 04:20 AM

I thought ebay possibly?

Posted by: bdstone914 Sep 11 2018, 05:37 AM

Edit. I do not have them
Was thinking thermostat pulley
R.
Bruce

Posted by: motorvated Sep 11 2018, 07:37 AM

PM sent. Thanks.

Posted by: Mikey914 Sep 11 2018, 07:46 AM

That's a lot of heat. May want to check your trans fluid on a regular basis.

Posted by: motorvated Sep 11 2018, 10:14 AM

Fresh oil and one race weekend for the last melted one. Pedal felt fine the whole time, but felt odd when driving the car out of the trailer about a week later. Tranny has a Quaife in it and I'm running it pretty hard. This probably belongs in the Garage if the discussion continues.

Posted by: motorvated Sep 12 2018, 05:28 PM

BTT - Still Looking.

Posted by: cary Sep 13 2018, 07:56 AM

Could try this. Moves it away from the gear box.


Do you a transmission cooler ?

Posted by: Larmo63 Sep 13 2018, 08:41 AM

I used Chris's excellent Tangerine pulley adapter that Cary mentions above.

That, and a Patrick Motorsports pulley....

Posted by: GregAmy Sep 13 2018, 09:09 AM

A simple piece of roof flashing (or .040" aluminum if you want to be fancy) is all you need to block the radiant heat from the exhaust.

The header on my Integra Super Touring car flowed right below the oil pan, about 2" away. I was seeing stoopit oil temps. I added some aluminum flashing mounted about halfway between the header and oil pan. Oil temps dropped 30 degrees.

Just make sure the flashing is not mounted up against the pulley, since conduction will get it there anyway.

Posted by: rhodyguy Sep 13 2018, 09:53 AM

Thermal barrier coat your headers.

Posted by: JamesM Sep 13 2018, 05:24 PM

Are you sure there is not something else going on with the tune of your car? That seems like a lot of heat in your exhaust.

Running a similar setup on my autocross car with the 4-1 collector running right by the clutch pulley. Prior to jet-hot coating and a custom bracket to angle the clutch cable slightly lower, the best I was able to do was melt the cable sheath where it ran close to the pipes. Melting the pulley that is not in direct contact with the exhaust just seems like a crazy amount of heat.

Retarded timing can cause some really high EGTs, just saying.

Posted by: Larmo63 Sep 14 2018, 12:11 AM

Posted by: Mikey914 Sep 14 2018, 04:05 PM

Is that a delrin pulley? Or just powder coated.

Posted by: Larmo63 Sep 18 2018, 10:28 AM

That is the Patrick Motorsports pulley that they sell.

Posted by: barefoot Sep 19 2018, 08:31 PM

Measure your fully and look in McMaster Carr online. they have all kinds of industrial stuff & may have something close that you may have to drill out the center hole to fit.

Posted by: motorvated Sep 20 2018, 10:11 AM

Great suggestion. Looks like they have both finished pulleys and blanks that can be machined. Might find something that will work.

Posted by: Chi-town Sep 21 2018, 09:39 AM

That kind of radiant heat is damaging a lot of other things besides that plastic pulley. I can't imagine what your trans oil temps look like.

Pick up one of these:
https://www.harborfreight.com/hand-tools/thermometers/121-infrared-laser-thermometer-63985.html

Point it at the trans, CV's, and clutch pulley after a hard run. This will give you a better idea of what you are dealing with as far as radiant heat.

I would also invest in a wideband O2 set up and double check your fueling because if the exhaust is that hot your exhaust valves and seats probably aren't going to last long at all.

If your fueling and ignition are spot on , then I would look into Jet-Hot or Zercotec not only to protect surrounding components but to lower engine bay temps and make more power.

Posted by: Mikey914 Sep 21 2018, 10:28 AM

My question is are you running a synthetic trans fluid?

Posted by: motorvated Sep 21 2018, 12:32 PM

Nope, just running GL-5 80W-90 regular "Dino" gear oil. Some photos of the melted Delrin pulley.

Posted by: Mikey914 Sep 23 2018, 05:04 AM

You don't see that kind of deformation til the 300 degree range. That's why I asked. May cause your fluid to break down faster.


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