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Index > Engine/Drivetrain > Thread: radiator fan shroud compatibility
Thread: radiator fan shroud compatibility
Peritrochoid


1st Gear
Posts: 44
posted September 14, 2003 11:55 PM

radiator fan shroud compatibility

Hey, does anybody know offhand if other fan shrouds will fit the REPU radiator? My REPU came without one and I'd like to add one for that extra bit of cooling. Will FB or FC shrouds fit?

Or heck, if anyone has a spare lying around I'll buy it off you as long as it's in decent shape. I'm fairly certain I have the stock radiator but I'd want to measure first to be sure.

Thanks,
Mike
____________
1971 R-100
1973 RX-2 coupe - too much to list -
1973 RX-2 sedan - project "infestation"
1975 REPU - big port 13B, race header, straight exhaust, RB "flying saucer" intake -
1983 GSL - streetported 12A, race header, dual straight exhaust -
1993 FD - project "crispy"

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Klaus43


Rotorhead
Posts: 1259
posted September 15, 2003 09:05 AM

Rx-4 or Cosmo units

might fit... I might have an extra, but would have to positive ID which one it is...

       
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Peritrochoid


1st Gear
Posts: 44
posted September 15, 2003 08:47 PM

I'll get some measurements on mounting holes tomorrow.
____________
1971 R-100
1973 RX-2 coupe - too much to list -
1973 RX-2 sedan - project "infestation"
1975 REPU - big port 13B, race header, straight exhaust, RB "flying saucer" intake -
1983 GSL - streetported 12A, race header, dual straight exhaust -
1993 FD - project "crispy"

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Klaus43


Rotorhead
Posts: 1259
posted September 16, 2003 12:36 AM

Mounting holes

...should be identical for REPU, rx-4, and Cosmo... at least, I would think. Same basic radiator...

       
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Jeff20B


Moderator
Posts: 661
posted September 17, 2003 10:33 PM

Cosmo is a bit different. It might fit though.
____________
'74 REPU
'76 Cosmo
'77 MG Midget 13B
'81 RX-7

       
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Peritrochoid


1st Gear
Posts: 44
posted September 19, 2003 04:07 PM

Ok I measured my shroud mounting holes and they are:

vertically: 9.75" apart
horizontally: 23" apart

If you have a spare one that fits (RX-4, Cosmo, etc.) I wouldn't mind buying it off you.

Thanks,
Mike
____________
1971 R-100
1973 RX-2 coupe - too much to list -
1973 RX-2 sedan - project "infestation"
1975 REPU - big port 13B, race header, straight exhaust, RB "flying saucer" intake -
1983 GSL - streetported 12A, race header, dual straight exhaust -
1993 FD - project "crispy"

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straightrepu


Redlining
Posts: 232
posted September 19, 2003 09:39 PM

upper half

I have the upper half of the shroud, I think its from a 75 or later, won`t work on my 74.
____________
74 restorepu

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Peritrochoid


1st Gear
Posts: 44
posted September 20, 2003 11:21 AM

upper half?

I thought they were all one piece, or are REPU shrouds different somehow?
____________
1971 R-100
1973 RX-2 coupe - too much to list -
1973 RX-2 sedan - project "infestation"
1975 REPU - big port 13B, race header, straight exhaust, RB "flying saucer" intake -
1983 GSL - streetported 12A, race header, dual straight exhaust -
1993 FD - project "crispy"

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Jeff20B


Moderator
Posts: 661
posted September 21, 2003 01:17 AM

Two piece.

'74 is 16". Later style is 18" opening. I'm not sure when they went to the larger size. My Cosmo has an 18" hole and fan. 1st gen RX-7s had 16" fans and shrouds.
____________
'74 REPU
'76 Cosmo
'77 MG Midget 13B
'81 RX-7

       
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Klaus43


Rotorhead
Posts: 1259
posted September 22, 2003 09:30 AM

Turns out

I have one of each size hanging in the garage... now I just need to figure out which one I need to keep, and run. Guess the bigger fan provides a bit better cooling... if it fits... To keep stock, or to modify...?
Which size do you need, Mike?

       
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Peritrochoid


1st Gear
Posts: 44
posted September 22, 2003 03:58 PM

Well, I suppose whatever fits the hole measurements I have. I just measured my fan blade and it's 16" so I'm guessing I'd need the 16" fan shroud. I wasn't aware there were 2 different sizes.

Mike
____________
1971 R-100
1973 RX-2 coupe - too much to list -
1973 RX-2 sedan - project "infestation"
1975 REPU - big port 13B, race header, straight exhaust, RB "flying saucer" intake -
1983 GSL - streetported 12A, race header, dual straight exhaust -
1993 FD - project "crispy"

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Klaus43


Rotorhead
Posts: 1259
posted September 23, 2003 09:42 AM

The mounting hole locations

are identical on both. Only question remaining is what the shroud really came on/off of... Difficult to ID for sure with no known original from a given year/model to compare it to... but it 'should' work, considering dimensions are proper. What's it worth? I'll suggest FedEx ground as the cheapest, most reliable shipping...

       
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roaddancer


Hauling
Posts: 127
posted September 23, 2003 10:16 AM

When comparing different body styles, there may be a difference in the vertical alignment of the engine to the radiator, affecting the opening of the shroud.
If I were an automotive engineer, all would be the same, but I wouldn't count on it from the factory. For example, the bodies with low front ends may set the radiator deeper than the Repu. Hard to tell with out actually trying to bolt one up. I believe that Mazda did use the same radiator/oil cooler assembly in many models, and the shroud mounts have some give, so it is worth a check.
If you have the time to take off the upper shroud and set the "possible" into it's place, it would tell you a lot.

One of our members who does fiberglass or plastics moulding may come to the rescue?
____________
formerly
rx2/3/4/cosmo,repu,94 rx7,

       
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Klaus43


Rotorhead
Posts: 1259
posted September 24, 2003 09:14 AM

Here's the thing...:

...upon further recollection, I'm fairly certain at least one of my shrouds is from a '74 rx-4... as far as 'test-fitting' it in a REPU, nothing I own is still stock '74... one has no radiator, engine, or transmission in it right now; my 'driver' has the 'wrong' radiator, a j-spec motor, and no shroud in place--probably a later fan as well--; and the other one's got all '84 GSL-SE stuff under the hood...

       
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roaddancer


Hauling
Posts: 127
posted September 24, 2003 10:08 AM

And that, kinda, supports my point. At this age, an original radiator may be rare as well. I remember mine had to be repaired and they plugged a leaky tube off, and told me next time would be a new radiator. That was 15 years ago...
____________
formerly
rx2/3/4/cosmo,repu,94 rx7,

       
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Klaus43


Rotorhead
Posts: 1259
posted September 24, 2003 10:42 AM

Without dissing your point,

Roaddancer, the OG radiators do exist... I'm fairly certain the one in front of the GSL-SE stuff is a REPU radiator... and I have a couple sitting in the garage, one of which is from a REPU, and one which is rx-4... Still, it's question of which engine/fan/shroud/radiator combination, in which application/year... and whether or not it's stock.
One can always have a shop re-core one's old radiator, if the tanks are still usable...
I'd be more than willing to 'match up' the shrouds and radiators in my garage... but it's pretty meaningless without engine and fan in place... beyond all the holes lining up, which they do.

       
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roaddancer


Hauling
Posts: 127
posted September 24, 2003 12:44 PM

Were there any running changes in the location of the fan, I.E. spacers behind, different clutches, etc? I remember a very different fan clutch on the Cosmo, for instance. I had to buy one, for a large sum....at least at the time.
I would think that various gens of RX7s would have some changes. (Don't talk to me about the turbos...I couldn't see much of the fan or radiator on my 3rd gen.)
The bottom line is that you may need to fiddle a bit, and try more than one shroud. Or expect to adapt mounts, which would appeal to me. Not rocket science.

____________
formerly
rx2/3/4/cosmo,repu,94 rx7,

       
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Peritrochoid


1st Gear
Posts: 44
posted September 25, 2003 12:36 PM

Hmm, well it seems I should probably just try to locate a shroud locally so that I can test fit it. I'm not sure bolt hole locations and fan size are enough. Not to mention shipping something that large. Even though it's light it would probably be expensive to ship.

Mike
____________
1971 R-100
1973 RX-2 coupe - too much to list -
1973 RX-2 sedan - project "infestation"
1975 REPU - big port 13B, race header, straight exhaust, RB "flying saucer" intake -
1983 GSL - streetported 12A, race header, dual straight exhaust -
1993 FD - project "crispy"

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Klaus43


Rotorhead
Posts: 1259
posted September 25, 2003 01:19 PM

I'd guess

only around 10 bucks from here to you, FedEx ground... Could we ID 'the' original REPU shroud definitively from a known example/pic ? Are you running your stock engine/fan/radiator?

       
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Peritrochoid


1st Gear
Posts: 44
posted October 05, 2003 05:36 PM

Sorry for not responding any sooner. I definitely do not have the stock engine, but am unsure on the radiator/fan. They appear stock but I don't have another REPU in the immediate area to compare to. Mike
____________
1971 R-100
1973 RX-2 coupe - too much to list -
1973 RX-2 sedan - project "infestation"
1975 REPU - big port 13B, race header, straight exhaust, RB "flying saucer" intake -
1983 GSL - streetported 12A, race header, dual straight exhaust -
1993 FD - project "crispy"

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