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Electric Fan Installation

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boeingpilot

boeingpilot

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I just purchased the electric fan kit from Moss for my TR4A. The installation instructions say it can be set up to be a pusher or a puller. Any advantage of one over the other?

Cheers,
Chris
 
I've used them both ways. I don't think it really matters.
 
Go with the puller configuration. It doesn't block the radiator, allowing better airflow when fan is not on.
This however is more work as the old mechanical fan spacer may need to be shortened or replaced. There are several articles about this. If you haven't seem them let me know and I will forward them.
What size fan did you get?
I just installed a 16 inch fan in the puller configuration.
 
Pullers are more efficient. Think about where modern cars have their fans mounted. I'm not as familiar with TR4's as TR6's but do you have room between the fan and the cross brace? On a TR6 it requires a "slim" fan to fit. You also might want to consider eliminating your mechanical fan. You'll save weight and gain horsepower for about $50. Rick Patton https://www.pattonmachine.com/FanEliminator.htm has a kit that's a perfect fit. You'll replace about 7 pounds with 8 ounces.
 
Horsepower gain has been discussed alot. I just want to add this information based on my own observation. When that electric fan starts up, you can here the engine start pulling as the alternator picks up the load. So the actual HP gain is greatest when the E fan is not running and the gain is lower when the E Fan is running.
The plus side is the E Fan only runs when required or when in overide (Do install a overide switch) while the mechanical fan is on all the time so to speak, with the greatest HP use at higher RPM.

FWIW
 
Another positive for eliminating the crank driven fan, was noticeable to me in my first test drive after I went electric.
During shifting the rpms did not fall off that much when the clutch was engaged. I attribute this to the lack of drag both from weight and the air resistance the spinning red fan created.
I noticed that because the engine speed did not drop as much that gear changes went smoother.
 
poolboy said:
During shifting the rpms did not fall off that much when the clutch was engaged. I attribute this to the lack of drag both from weight and the air resistance the spinning red fan created.
Click to expand...

I think the weight would help it stay at the same RPM (Newton's first law) but the air drag from the fan would slow it down. I guess that in this rock, paper, scissors game drag beats Newton :smile:
 
Adrio said:
poolboy said:
During shifting the rpms did not fall off that much when the clutch was engaged. I attribute this to the lack of drag both from weight and the air resistance the spinning red fan created.
Click to expand...

...... . I guess that in this rock, paper, scissors game drag beats Newton :smile:
Click to expand...
That's a good one! :lol:
 
Ok Boeing Pilot Info please. Are you a Airline pilot who flies Boeing or are you a Boeing pilot?
 
Sounds like the old joke about the 747 cocktail ...
 
No, it looks like he lives in Oregon, which would be Northwest....... :lol:
 
Yup, I work for Southwest. I used the fan eliminator kit and installed the electric fan as a puller. Of course, it promptly began raining so the whole thing has remained untested. Thanx for all the info.
 
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