Sherman Update-cooling issues
After a month or so of driving, I've changed a couple of things:
1. Over a long weekend, we took Sherman camping, towing our starcraft 11rt tent trailer up near Tahoe. At about 4000 feet and at 90 degrees, the engine was at around 250 and struggling. I could not get it to cool down below 230. I had to turn off the a/c and turn on the heater. Not a happy family moment.
I have learned the following:
1. I had the timing retarded. Didn't know that if the timing is off, the engine can heat up pretty good. Just this change made a big difference in engine temp.
2. The 14" pusher fan does not blow enough air to cool the a/c and the radiator. Instead I have replaced it with a 16" puller fan hooked up to the same controller. According to specs, I have gone from about 1000 cfm to about 2100. (I learned that pusher fans are only about 80 percent efficient)
3. I also put in a coolant additive (DEI radiator relief) which promises to keep the coolant up to 30 degrees cooler.
4. Trying to start from a stop with a hot engine was resulting in a weird surging and bucking. I determined the fuel line was too close to the water pump/valve cover, despite trying to isolate it. So, I insulated my fuel line from the fuel pump over the front of the engine to the carb with tubing insulation to keep the fuel from vaporizing.
So far, so good. This weekend, without pulling the trailer, but with some hills, the temp maintained at around 185-190.
Fan: Flex a lite FLX 116 $92 at summit racing
http://store.summitracing.com/partdetail.asp?autofilter=1&part=FLX-116&N=700+0&autoview=sku
Additive: DEI Radiator Relief $10 at summit racing
http://store.summitracing.com/partdetail.asp?autofilter=1&part=DEI-040200&N=700+0&autoview=sku
Insulation: Thermotec THE-17062 $13 at summit racing
http://store.summitracing.com/partdetail.asp?autofilter=1&part=THE-17062&N=700+0&autoview=sku