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Engine Operating Temperature

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John DeVries
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Engine Operating Temperature

Post by John DeVries » Sat May 27, 2017 10:36 am

Is there any good reason to mess with a '67 big block Ford engine that is running at 120° without a thermostat. The specs say it should be 140°. The engine has been running great for a long time.

The only thermostat available for this engine is a 160° unit that would require holes being drilled in it to get down to 140°.

The owner of the boat wants to know if there would be any efficiency/performance benefits from getting back the missing 20° of operating temperature.

Thanks

John

joanroy
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Re: Engine Operating Temperature

Post by joanroy » Sat May 27, 2017 11:24 am

If the engine spec calls for operating temp of 140 and she runs at 120, I'd leave it be. Better to run a little on the cool side than too hot. I'm not an expert, but I doubt an extra 20 will improve performance. Happy Boating!

jfrprops
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Re: Engine Operating Temperature

Post by jfrprops » Mon May 29, 2017 9:26 am

run that baby...heck the gauge could me off that amount. That spec seems chilly to me?

John in Va.
1980 Fairchild Scout 30
19?? custom Argentine Runabout 16'
1954 Whirlwind deluxe dual ckpt 16'
1921 Old Town Charles River 17' (founding Captain, James River Batteau Festival)

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John DeVries
Posts: 160
Joined: Fri Sep 22, 2006 5:47 pm
Location: George, IA
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Re: Engine Operating Temperature

Post by John DeVries » Mon May 29, 2017 1:05 pm

Thank you very much guys. This was something of a "fishing expedition" of my own creation (never do that again) and I just wanted some backup to leave the engine alone. No sense looking for improvements on an engine that is working very well.

Thanks again.

John

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