I'm trying to help a Newbie on here with moderate overheating problems with his IM. He has a 1915, not full flowed, no external cooler and it's getting up around 220F on highways in summer heat. He sent a bunch of photos and there is no opening in the firewall right in front of the fan inlet.
Is this normal for most IM cars?
Has anyone opened up the firewall in an IM, with a hole to let more air in?
I've got him thinking about which external cooler he wants to buy, and CB Perf. has a "full flow" oil pump that pulls oil off at the oil pump cover and returns it to the oil pump cover so no drilling and tapping the case - Interesting:
https://www.cbperformance.com/product-p/1786.htm
That would allow an external filter, too.
Anybody on here used this approach?
While his local mechanic (who seems to know air cooled engines) thinks that 220F is OK, both the owner and I would like to see something closer to 200-205-ish so that's the rationale for the added cooler (just like the rest of us). I suggested a DeRale 16-pass fan assist cooler, but I know a lot of you run Setrab units. Do they offer one with an integrated 180F thermostat switch or should he just look at those at CB Perf?
https://www.cbperformance.com/...ccessories-s/255.htm
Thoughts would be welcome.