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Old 01-17-2011, 09:02 AM
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Engine Running Too HOT

Ok this motor is only a month or two old, 50-75miles on it

355cid (10.5.1), xr274 solid lifter cam, cannfield aluminum heads 210cc, holley 770cfm, 4-core radiator, mechanical (flex-a-lite) fan and an electric fan, SAE 50 VR1 Oil (fresh), two K&N valve cover breathers, edelbrock high flow water pump, NO thermostat, Mid length 1-5/8 to 2.5inch exhaust

My issue is just recently it started running pretty hot like 210-220, when driving it doesnt go down at all, it used to run at 160-180, i checked everything i could and cant seem to find the problem, i have a wideband gauge and i know the car is tuned pretty dead on and it runs like a champ other than the heat issue.

what could be causing this, any ideas? would the pistons rings finally seating cause this?

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Old 01-17-2011, 09:09 AM
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Take the electric fan off and install a thermostat.

The electric fan is most likely blocking more flow than its helping since a mechanical fan is more than adequate. The Thermostat regulates flow to keep water in the block and radiator long enough to absorb heat and shed heat. Leaving it unchecked can cause it to not spend the right amount of time in the right place.
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Old 01-17-2011, 09:10 AM
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hot motor

first u really do need some kind of restriction in the cooling sys. even a piece of sheet mtl with a 3/4" hole in it.. i doubt the rings are the problem. u should not have a air problem when filling with no stat.. where is the temp sender located?
i've found if in the head it will read a little higher then if in the intake next to the stat.. bill
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Old 01-17-2011, 09:13 AM
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Can I ask why in the world you are running 50wt oil? Unless the engine was built with large clearances, it's not necessary. Just robs horsepower, and takes longer to build pressure when the engine is cold. Definitely put a thermostat in it.
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Old 01-17-2011, 09:18 AM
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Also, I should add.... 220 isn't too hot. As long as its stable and your oil temps stay in check, don't worry.
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Old 01-17-2011, 09:34 AM
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"Used to run 160-180" and "50-75 miles" seem like conflicting statements. When did the motor run at 160? For the first 25 miles? Maybe the driving conditions were different... or have you been adjusting your timing? Anyway, sounds like the suggestions given by the others are all you need, as in ditch the electric fan, make sure you have a fan shroud (or an extender to put it close to the radiator), go to 20/50 oil, and install a thermostat.
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Old 01-17-2011, 11:10 AM
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THanks for everyones answers/suggestions, i will put the thermostat back in Definetley, and i am going to experiment with the electric fan (take it off, test it, then maybe make it a pusher instead). i know i havent driven it much, mostly because i've been doing so much to it and havent been comfortable with it yet.

THanks again!
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