• When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

Overheating mystery

Agree on the high volume. Prefer regular pump. Burp? Use a laser temp gun to be sure of actual temperature. Green coolant. Remove and boil t stat.
 
Thanks for all the ideas. Most of the things suggested have been done. I haven't changed the water pump and I have found no restrictions.
I don't think it's the radiator as it cools as I stated before , 80 degrees. Attached is a photo of the engine bay.
Thanks again for the help

IMG_20180726_172916743.jpg
 
Check your rad inch by inch with your ir gun and look for weird temp fluctuations. In a crossflow the temp. Should be hot all down the inlet side and cooldown evenly, more or less, until it reaches the outlet.
 
Also try using an IR gun to check the exhaust temps at the header, the sides of the block at each cylinder ( tight rings?) intake manifold to head. If this is a new build and the problem has been since start up, maybe an engine problem as well as radiator/pump/fan problem. Obviously you are not running a stock setup. Why not get modern an go with a couple of high electric flow fans. No HP drain and flow air even when shut off to help with heat soak. Does your temp go down when cruising over 45 mph. How hot is it where you live ?
 
I agree with Don (post #23). Looks like the fan is way too deep into the shroud. It should only be about half way in.
 
I thought that the shroud was irrelevant after about 25 mph of road speed.
 
Bad shroud design; and as stated, could be a timing issue. Could be running lean fuel mix?
 
The temp gun on the radiator won't tell you about flow, and the temp readings can be similar with a restricted rad.
 
That shroud is more of a fan guard. A shroud should be able to funnel all incoming air to the fan. The fan should have about a1 inch clearance from the fan tips to the edge of the shroud, with the fan 1/2 way in the shroud opening. I run a Summit 18 inch stainless fan. They pull alot of air. Clutch fans can be a tight fit.
 
Look at the fan placement on this car. I know it's a little dark, but the shroud needs to cover the whole radiator core, and completely surround the fan. I had to make this one from fiberglass since the radiator was aftermarket, and the stock shroud wouldn't fit. Until you fix these basics, you won't be able to fine tune your cooling.

20180301_160306.jpg
 
Well I finally bit the bullet and bought a new SpeedCooling 2 row 22" radiator, ditching the BeCool 22". It now runs 180- 190 at idle and on the short drive I made
That is without a shroud so I think itsi fixed.
Thank everyone for your input. Sometimes you just need another set of eyes.
 
Had one that ran hot at idle & then stayed hot.
Bumped initial tming up 4 degrees dropped temp
& Stayed.
Just make sure total is within spec.after adjustment
 
Out of curiosity does your ECP radiator have the same 90 degrees differential?
 
185 inlet 140 outlet on the temperature.
I'm going to drive the 64 some tomorrow
And confirm the cooling.
 
185 inlet 140 outlet on the temperature.
I'm going to drive the 64 some tomorrow
And confirm the cooling.
So, 45 degrees differential. I measure 43 degrees differential consistently on mine. I also have a ECP radiator. Very interesting that you measured so high before. I wonder if you had a blockage that slowed the flow?
 
Auto Transport Service
Back
Top