Pontiac overheating solved!

[timjen7]

Hello PT members:

I have been a member on PT for some time and my personal build of my 68 Firebird can be seen on this site. After my build and initial tests of the car, we were running in to significant overheating issues mostly at idle or stand stills. On the freeway the car would OK, maybe a little warm, but nothing concerning.
After a lot of research we discovered this to be a very common problem with the older Pontiac engines, particularly 400s as they notoriously ran a little warmer stock, but when modified like mine, overheating almost universally became an issue. After going through every suggested remedy, electric fans, high flow pumps, timing adjustment, etc., we experimented with the design of a new pulley especially for the Pontiac motor. The unit was installed several months ago and we have been testing since then. After months of testing in cool, moderate, and hot weather, the unit works perfectly, and in most instances cooler than expected. The car routinely now runs on the streets at around 165-175 and within 175-190 on the freeway. This is on warm mid 90's days (we are in Southern California).

About the product: We have patented and begun manufacturing the unit for the Pontiac market (this can work with some other vehicles Buick, Olds, etc). The product is a 100% USA made aluminum pulley and we will offer it in black anodized and clear coat natural aluminum finish. It attaches to your stock pump, and except for a new belt bought at your local store, no other mods are necessary.



We guarantee the finish and quality of the product and that it addresses your overheating issue.

If you'd like more information, pricing, etc. please feel free to PM me.

[JustJohn]

They allowed a gear ratio change patent to go through?

[timjen7]

Under a utility designation they would not, but under design if it is unique in the market, then yes.

[JustJohn]

Under a utility designation they would not, but under design if it is unique in the market, then yes.

Interesting. Good luck with the project!

[dontlifttoshift]

Tell me more about this magic pulley. I "think" you can pimp it here as long as you don't post pricing.

[chiva]

I will be your 1st customer. PM me when I can get one please.

[dmastrota]

I am interested. I have a 67. bird and I have a Butler crate motor and can't seem to get it to run cool. I have a Ron Davis radiator and fan set up in it. I tried everything ,flushed the complete system, high flow water pump and still running hot, like 195 to 210 on a hot day.

[ponchoblue]

I'm interested as well and curious about the depth of the pulley as i have later 11 bolt setup in a 66 a-body

[PonchoJohn]

Did you try adjusting the clearance between the metal backing/divider plate and the water pump impeller vanes? This is the most common cause of overheating- Pontiac designed cast impellers, but the rebuilders started using cheap, stamped pieces... the clearance was too great, and the pump would cavitate.

[ponchoblue]

yes its been done but I'm always willing to try new things to make it cooler

[MonzaRacer]

Odd drove 400 for several years, 3 row std Chevelle type radiator and never had heating or cooling issues. Biggest issue I ever had was bad seals on separator plate to cover. Then they started making them and wasnt stuck looking for NOS, Also had issues with the heater nipple in back of head, but now in aftermarket so no issue. BUT if it helps, bit confused, is this a new pulley setup or just one or,,,,?

[firebirdfever]

still waiting for info on the pulley. got pictures you want to share

[anguilla1980]

After ensuring my impeller backing plate was super tight on clearance and trying a Flowkooler water pump, I just went to a Meziere EWP (the HD version). It's an all inclusive design so no backing plate indexing fuss. I'm finally cool now stop light to stop light, plus I can run it after shutdown for a bit. I'll never screw with anything again on my Pontiac setup.

Full disclosure; I have a C&R module with dual Spal fans which are already awesome, but the EWP was the key for me.

[79T/Aman]

hard to quantify such a post without dimensions, Pontiac used different pulley diameters and often time the wrong combination of pulley diameter ave been used, this is easy to do on Pontiacs since many of the parts are interchangeable.
What size are the crank and water pump pulley used?

[firebirdfever]

having issue with overheating the engine has the march pulley, and serpentine belt. On a hot California day ill see 225 degrees. What pulley size should the water pump have?

[CarlC]

The OP has not been around for nearly a year.

[Roughneck3]

Hello
I read your post about the pontiac 400 overheating.
Do you have any info and size on the pulley you made and can I buy one from you??

Hello PT members:

I have been a member on PT for some time and my personal build of my 68 Firebird can be seen on this site. After my build and initial tests of the car, we were running in to significant overheating issues mostly at idle or stand stills. On the freeway the car would OK, maybe a little warm, but nothing concerning.
After a lot of research we discovered this to be a very common problem with the older Pontiac engines, particularly 400s as they notoriously ran a little warmer stock, but when modified like mine, overheating almost universally became an issue. After going through every suggested remedy, electric fans, high flow pumps, timing adjustment, etc., we experimented with the design of a new pulley especially for the Pontiac motor. The unit was installed several months ago and we have been testing since then. After months of testing in cool, moderate, and hot weather, the unit works perfectly, and in most instances cooler than expected. The car routinely now runs on the streets at around 165-175 and within 175-190 on the freeway. This is on warm mid 90's days (we are in Southern California).

About the product: We have patented and begun manufacturing the unit for the Pontiac market (this can work with some other vehicles Buick, Olds, etc). The product is a 100% USA made aluminum pulley and we will offer it in black anodized and clear coat natural aluminum finish. It attaches to your stock pump, and except for a new belt bought at your local store, no other mods are necessary.

We guarantee the finish and quality of the product and that it addresses your overheating issue.

If you'd like more information, pricing, etc. please feel free to PM me.

[Closf71]

https://youtu.be/v_qUY4E33r0?si=tjGWugSliuupEih0

[stevehoj]

These have been out there for a while also. See link below.

http://www.precisionautomotivespecia...tml#anchor_524

[Closf71]

Thanks for the link Stevehoj. That's awesome.