RE: [T3] can you convert a T3 to an alternator?

[Plk554@aol.com]

Toby and fellow Type IIIers,

I have just done a run of a few auto wrecking yards and these are the part 
numbers for the types of Mitsubishi Alternators that are on the RX7 cars. 
Some are 50 amps, 55 amps, and 70 amps.

    A5T20374    12v/50amps      built in regulator                  70s RX7

    A5T30574    12v/55amps      built in regulator                  early 80s 
RX7

    A2T04474    12v/70amps      built in regulator & cooling fan    late 80s 
RX7


There seems to be 2 different types of these alternators. One type has a 
cooling fan mounted on the outside and behind the pully. This fan needs to be 
removed so that the pully will fit into the sheet metal housing that has the 
fan belt in it. You may use the stock VW pully after cuting the spacer down 
that comes behind the stock RX7 pully. You may also use the RX7 pully which 
is smaller outer Diameter which makes it spin faster. The choice is up to 
you. You can see this type in the pics that Toby has on his site of a 
modification I did recently. It was a 55 amp one. The lack of a cooling fan 
is made up for by the cooling air hole located in the fan housing under where 
the generator/alternator sits.

The second type of alternator is the internal fan type. All of the 70 amp 
ones I have seen have been this type... and about half of the 50/55 amp ones 
are too. If you use this type, just use the stock RX7 pully and get a fan 
belt about 1 to 2 inches smaller.

Hope this helps some.  Pat@volksclocks

        

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