That is tight! That's what my setup looked like with the Hayden 2947 unit. I'd be afraid to corner too hard with it so close there. Thankfully my car doesn't exactly corner. Heh.
Did they even come with a clutch fan back then? That would explain why it's all so tight. Is the radiator support one that has a "filler panel" for the /6 radiator? Maybe there is a fabrication solution there.
Nope they did not come with a fan clutch with the slant six. Yup the radiator core will need to be pushed back towards the grill by 1/2 inch to clear that 1969 Volovo fan clutch, thats the biggest issue.Did they even come with a clutch fan back then? That would explain why it's all so tight. Is the radiator support one that has a "filler panel" for the /6 radiator? Maybe there is a fabrication solution there.
Yup, exactly the motor can move forward if you brake hard, and even more if the mounts are worn out.That is tight! That's what my setup looked like with the Hayden 2947 unit. I'd be afraid to corner too hard with it so close there. Thankfully my car doesn't exactly corner. Heh.
That 1/4" was taken up by your motor plate, but if he did it, that would throw his pulley/belt alignment off, no?
^^^^^
Yup, exactly the motor can move forward if you brake hard, and even more if the mounts are worn out.
2.32 inch tall is the Volvo Hayden fan clutch, the hayden 2947 one is 2.7, Electric fans will free up H.P how much i dunno.
View attachment 1715518028
yes..use a proper 7 blade mechanical or mopars' own flex fan.If your cooling is compromised you will surely over heat idling with the clutch fan...and when they fail it's no fun.
Simple solution is just to use the iron water pump, and the original 273 alternator brackets and all pulleys. They will fit a 360 no problem, and the hoses will now fit the original radiator. The iron pump is shorter and a fan clutch will fit easily. The only problem will be that the timing marks will be partially hidden under the lower radiator hose, but even that can be fixed by using the 273 front cover. The 273 damper won't work on 360, though, as a 273 is neutral balanced and the 360 is externally balanced. However, the 360 balancer can be used with the early timing cover simply by marking the TDC to work with the 273 timing cover.Good question.
The trouble is the water pump. Years ago when the original 273 engine failed I went to rebuild it but at the time pistons were totally unavailable. So I built up a warmed over 360 because they were cheap and easy to source. The trouble is that in doing so a bunch of other stuff has to be modified for an early A - like the newer style water pump which is much longer than the original cast iron unit. If I was still running the 273, which I often wish I had in the bay instead, it wouldn't be a problem.
Side note: the 360 also necessitated getting the radiator inlet and outlet ports swapped to suit the new pump, and another core added to the mix. Both of those changes fill up the gap between the pump and radiator fins.
The problem is worse for a /6. It's a long engine with an even shorter gap between the fan and radiator fins. I want to say 2"?
So sure, I could cut and hack and weld a little to fabricate mounts and move the radiator forward but it's a lot of cutting that I'd rather not do to a nice car. The clutch fan is the more elegant solution.
The parasitic loss of the fan is minimal all things considered.
If the fan is pushing 100 CFM ( just a number for illustration) and you are driving fast enough to push 100 CFM past the fan there would be no parasitic loss. If you are going fast enough to push 150 CFM it could be argued that you are actually adding power to the system.
If you have an electric fan plug it in, it pushes air.
Now use your compressor and blow air at its inlet. With enough air you can make the fan spin faster.
If you measure the current it will be higher without the compressor blowing on the fan and lower when it is.
Im thinking it is an early A and a \6 based on the info from the posts, and the OP is trying to eek out an extra HP or 2.What is the final setup you are trying to cool ?
Engine, transmission ??
Slant 6 with 904
273 with 904
360 with 904
360 with 727 ??
What year and model car .
Thanks for the reply. I'm not so much looking for extra cooling as I am just trying to reduce parasitic loss. I don't mind fabbing something together
I found a possible solution for a Mercedes clutch and fan. I ordered parts from Rockauto and will report back my findings once they arrive. If it works I'll provide part numbers. Useful for early-As with aluminum water pumps and /6s.
If I was still running the 273, which I often wish I had in the bay instead, it wouldn't be a problem
Im thinking it is an early A and a \6 based on the info from the posts, and the OP is trying to eek out an extra HP or 2.
What is the final setup you are trying to cool ?
Engine, transmission ??
Slant 6 with 904
273 with 904
360 with 904
360 with 727 ??
What year and model car . . ?
Why are you looking at all the foreign parts to try and get your spacing right ?
Fail fail fail.
I picked up two fan clutches for a W116 Mercedes, a Uro unit and used original MB unit and both clutches are exactly the same width as the Hayden unit. Specifically I bought parts for a 1977 Mercedes 280se and a 1979 450sel.
Also picked up a complete Toyota Tundra / 4Runner assembly that SSD provided a link for:
TOYOTA TUNDRA TACOMA 4RUNNER T100 COOLING RADIATOR FAN BLADE AND CLUTCH 3.4L V6 | eBay
.. but it's over an inch too long. Measuring at 3.8".
Also bought a fan from Rockauto, the only Mercedes unit they sell, and sure enough the fan blades spin the wrong way.
So despite the claims none of the units I've bought so far work at all. Still sniffing around the boneyards for a Volvo unit.
Of note is that I've spent some time on Mercedes-Benz forums and found that they dislike nearly all the aftermarket fan clutches because of the high failure rate. Apparently the stock unit, made by Sachs these days, is $550. So even if it fit it would be much too expensive. So my summary is that the MB parts just won't work.
I'll keep looking in the same of science.
What is the final setup you are trying to cool ?
Engine, transmission ??
Slant 6 with 904
273 with 904
360 with 904
360 with 727 ??
What year and model car . . ?
Why are you looking at all the foreign parts to try and get your spacing right ?