I got mine from Autozone.3800 cfm for a Mustang $65. then ordered adjustable controller from Jegs.com $26.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran

In a 240D?

Lot's of kids on other fora, for those propeller cars, talk about how great the "fan delete mod" is.

"AAWWW DAWG!! I got 4/10 faster at 'run what you brung' at the drag strip last Saturday after my fan delete mod, underdrive pulleys, unobtanium alloy spark plugs and custom hi po cheese cloth air filter. But now when I go to work and back every day, up the Grape Vine, why the hell is it over heating?"

Then they're ever searching for a puller electric fan to 'help' the pusher fan on the front because they end up in a loss to explain why they are "running hot in city traffic but not on the interstate, during January."

The S/M 50 & 52 motors (from BMW) are some of the heartiest gas engines to come out of Germany (see the Mobil 1 'million miles test') but when you take off the fan you don't do the engine any favors.

Before I hop off the soap box, ponder this - electric fans were in use before 1983. We still have pulley driven, RPM dependent fans and, IMO, I think so for a reason.

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1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine)
Raleigh NC - Home of deep fried sushi!

Hi. I have put an electric fan on my 240 D. My car's A/c is inoperative and the aux fan was toast. I basically used the relay/wiring for the aux fan to power a new fan, I installed a termostat in a copper tube in the bottom hose and I use that to pilot the relay. I bought a SPAL fan from Surplus Center @ $34.95 a very good quality fan, but it can only be installed as a pusher and has to be mounted backwards, but it works. If you don't have A/C, the stock aux fan may be OK to cool the engine. I have run this way for a year or so, with no problems, but I don't tow and I don't spend a lot of time stuck in traffic. I am in SE PA, which can get quite hot and humid, but probably not what you see in summer. As far as fuel savings - there ain't any, not that I can see anyway. In theory, you should save some fuel, especially in winter, but if I did, it was in the fraction of an MPG

In comparing ' efficiencies' two items jump out..

1. That is assuming a very good cowl on the puller fan to radiator flow through area. Meaning that anything less than great in terms of ' sealed' and thus all its energy directed towards actually pulling air THROUGH the radiator cooling fins will really decrease it efficiency... any gaps will be MUCH LESS resistance to air flow than through the little spaces in the radiator core. So the air will tend to flow through the gaps at a much higher flow rate than through the radiator fins.

2. If you change to an electric fan in back of the radiator you have placed something which , if not working for any reason, mechanical or electric , will be severely impeding the flow of air through the radiator.

I suspect the HP and mileage statement is right on the money... the alternator has to work harder to turn the fan so what is saved directly from the engine fan belt load is at least partly taken up by the load of the alternator.

But the main point I would suggest is important is that in doing this change you are taking away from a very reliable system and making it less reliable..

If you find PEH's story about driving across many states after having a total electrical failure ( let the engine run at night, drove only in the daytime ) you understand that the mechanically run fan on the front of the engine not being subject to electrical problems is a very good ' make it home ' to get repairs feature...

It is even more secure on 240's with their direct mount... as compared to the viscous clutch system used on the Turbo units..

If someone really wanted an efficient system ( but which would still be subject to electrical problems ) they would make a long tube radiator with the turbo mixing fins inside each tube and a Squirrel cage fan blowing on it.. in a longitudinal manner.... a Squirrel cage fan is much much more efficient than any bladed fan.
I am not suggesting changing from the solid mount fan which comes stock on a 240d....

This is not directed towards changing the mind or actions of the original poster... as I believe he owns his car and can do whatever he wants to or with it...
This is for any other persons who might be considering the pros and cons to the situation...

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/showthread.php?threadid=10414

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

I have replaced a stock fan on my '75 Bricklin with an electric fan. Other cooling problems make it difficult to determine its effectivenes. That was probably the early 90's. I have looked at articles on Jeep Cherokees/Comanches. Some use the Ford Taurus electrical fan. In both cases some vehicles do well, while others don't. You need to look at the CFM rating of the fans. I think latter Corvettes use an electric fan. From what I have read, you gain from 2-5 hp. So, that might be 1-2 mpg gain. I think if you are doing mainly highway miles, you'd see a gain in mpg. If mainly city, then the fan would run a lot, and the alternator would have to pull power to recharge the battery. Blade design, closeness to radiator and closeness of the fan blades, or gap of blade, to fan housing are considerations of how effective the airflow will be.
Tom

I put in a 3000 CFM perma-cool electic fan in my 300TD in 2004. As you said already, removing the stock fan made things a lot quieter and made the front of the engine a heck of a lot more accessible.

Never had any problems with it.

I wired it in with a Flex-a-Lite Variable Speed Control module that turns the fan on at 60% speed around 85 degrees, and moves up to 100% as it gets hotter. I also added a switch in the car that will bypass this and turn both the Perma-Cool and the stock electric AC fan on 100% in case I need extra cooling (idling with the AC on or whatever).

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'81 300TD Wagon 355k (Miss Diesel)
'83 300SD 180k
'84 500SEL 190k (Parting it out)

81Wagon,
IF someone were wanting to change to electric fan that sounds like a good installation...
Do you have any stock numbers / Urls for reference ?

That probably provides more space for access than the same deal would in the 240 due to taking out the viscous fan also...and I certainly agree that my 240 fan is noisy.
The combo of sensors AND bypass ability for the operator is a great idea.

I also like what I have read about the SPAL fan in the past...

I wonder if there is a difference in size with regards to ease of constructing the cowling to utilize them well ....

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/showthread.php?threadid=10414

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

Where did the red top sensor come from?


I plan on doing this type of mod - for those of you that don't like it, well don't do it to your vehicle. Guess you wouldn't like what else I have done to mine...but ask me if I care.

Holey Mother of!... What have you done!










New Project Skunkwerks EM9D




.

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1983 123.133 California
- GreaseCar Veg System

Just get the plastic clutched fan from the 84-85 300SD. Electric fans suck and just add more things to break.

This is the sensor I used, when I first hooked it up I was looking for something thast would turn on the fan. didn`t like most of the one`s I saw that fit into the radiator fins etc.... so an MB indy shop owner said to use the red one, and ordered it for me.


Usually the fan never turns on because the engine doesn`t get that hot. It does work though.

HMMM, I tried to post the link, anyway, I found this under 85 380SE radiator fan switch. around $20

Charlie

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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works

Hey Charlie, it's been 6 years, how has the 16" Spall fan been working?

What kind of fan shroud is that?

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked