Heat Exchange? All the guys with 427's

[ggunter]

This question is for the guys with 427's (or anybody who has dealt with engine heat) Got my engine change out done this weekend and have a noticeable heat difference in the engine temp. I am running the FFR radiator and the FFR electric fan with a 175 degree thermostat. A 180degree thermostat in the engine. With the 347, the fan never came on unless you were sitting at a long intersection stop light and then would go off once you were a half mile down the rd. I took it for a 25 mile ride Saturday and the fan comes on the first time you come to a stop for more than 30 seconds and will not go off unless you travel a several miles at 50 miles per hour but is always at the edge of coming on. I know that is the fans job but if I sat for 3 minutes it will overheat. My timing is 12 degrees static and 32 degrees total advance. Total advance is in at 3500 rpm. I ordered a 3000cfm fan from summit which I think is about a third again as large as the FFR fan. Hopefully that will help. Anyone have any thoughts or suggestions to get some heat out of the engine. Thanks G

[Jeff Kleiner]

Think about this for a minute:
—-You are using a sensor that is asking the fan to come on at a 175 degree coolant temperature.
—-You are using a thermostat to maintain 180 degree coolant temperature.

If they are both doing their job correctly and accurately once the fan turns on it won’t shut off which is exactly how you have set it up. If you only want the fan to run as needed to help maintain a 180 degree coolant temp you need to be using a fan activation sensor that will turn it on ABOVE 180, not below.

Jeff

[ggunter]

Makes sense. I will recheck the fan sensor temp.

[Railroad]

Not the mechanical fix you need, but throw a bottle of Water Wetter in the coolant. It will help whether you have an issue or not.

[frankeeski]

Me:
347 high compression FSB
192 Ford (factory recommended) thermostat
MicroSquirt ECU controls fan to come on at 200 degrees F*

What do you consider over heating?

[ggunter]

Just going by the 347 it never got above. 195 in traffic. This motor quickly goes to 210-215. I would just like to keep it around 195 max.

[rich grsc]

Same temp sensors, or different ones, do they match the gauges? If it is actually getting that hot as quickly as you say, then I'd be trying to find out why. I wouldn't expect that high of temperature unless it was 90-100* outside.

[Chopper]

Typically fan switches will turn on at the set temp and turn off about 10 degrees cooler. The software in my Pro-flo4 does the same as well. Thermostats normally open over a 5 degree range starting at the listed temperature.

If you have a 180 degree thermostat, you probably want a temp switch that's 190-200 so that it's not constantly closing the thermostat. I know it's apples to bananas, but I have a 195F thermostat in my 306, and similar to Frank I turn on the fan at 205 via the Pro-flo. Previously I used a thermostat switch which also worked fine, but the sensor location and simplicity of using the EFI was better.

[FLPBFoot]

I'm running a 195 degree fan switch in my Blue Print 427 with 180 degree thermostat. Only in 90+ ambient temp will the temp gauge get up to 95C or 203F while in slow traffic. The FFR supplied fan will hold it there with no issue. I've never had it go above 95C even while sitting idling. I added a fan control switch on my dash so I can have the fan controlled by the temp switch, off, or on full time. I use this when I pull into a car show or make other stops to shut off the fan so it doesn't sit there and run for 5 to 10 minutes running the batter down.

[Rdone585]

If you don't already have a radiator shroud for the fan I would highly recommend considering it. That will change the airflow through the radiator from the area where the fan is to the entire area of the radiator covered by the shroud.

[Chopper]

If you don't already have a radiator shroud for the fan I would highly recommend considering it. That will change the airflow through the radiator from the area where the fan is to the entire area of the radiator covered by the shroud.

+1. Also if you don't have a piece of aluminum sealing the gap between the top of the radiator and the front of the hood opening, consider that (Breeze sells it as well).

[ggunter]

I bought a fan from Summit that flows 3000cfm. Same diameter as the FFR supplied fan. Half the noise and it takes away the heat. It will hold the coolant temp to 195 sitting in traffic. Soon as you start moving the ram air in the front will drop it to about 176. This was with ambient temp of 80, I'm sure it will climb a bit on a 90 degree day. I'm happy.

[ggunter]

Has anyone had any issue with a Tilton Throw out bearing. Went for a ride Sunday and for the first three minutes the bearing was squealing then quieted down. It's a new bearing with 168 miles on it and I'm sure Summit will stand behind it, but I don't want to replace it with another if there is and issue with these bearings. My other engine had a Mcleod bearing which worked fine, but I read several reviews of problems of those bearings failing from seal leaks. These things aren't cheap and a bear to change out so I only want to do this once. Any thoughts?

[D Stand]

I bought a fan from Summit that flows 3000cfm. Same diameter as the FFR supplied fan. Half the noise and it takes away the heat. It will hold the coolant temp to 195 sitting in traffic. Soon as you start moving the ram air in the front will drop it to about 176. This was with ambient temp of 80, I'm sure it will climb a bit on a 90 degree day. I'm happy.

Which fan did you purchase that helped? Also, what temp is your t-stat in your 427?

[Hoooper]

Do you have your clutch stop set correctly?