Posted: Tue Apr 26, 2005 5:26 pm Post subject: Cosmo LSD into 74 Rx2, Lake City Rotaries manifold on Rx2

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Im thinking of buying a 78ish Mazda Cosmo so that I might use the limited slip out of it in my Rx2 for auto cross. I dont really want the whole rear end. Just the 3rd member. Are the axle shafts interchangable? I tried looking on Felix Miata's page but it evidently doesn't exist any more.

Im also wondering if any of you guys have ever had a lake city rotaries intake manifold on one of these cars. I have a street ported 4 port 13b that I would like to fit into this car but Im not sure that the side draft intake I have for it will fit without hitting the strut tower. It barely fits in the 79 Rx7 that its in now with out hitting the frame rail. I just have velocity stacks and little filters on the tips of the stacks right now so co worries about a big air filter.

And one more thing. is it possibel to put the early style bumpers on this car. The way it sits right now its not much to look at but those bumpers are hideous! I like the smaller early style ones much better as Im sure does everyone else. What years did they use the smaller ones.

Oh hey heres another question lol. I recently ordered a brake master cylinder for it too. The old one is really rusty and I cant even get the plunger out of it to rebuild it. Any way... Auto Zone has no listing for an Rx2 master cylinder so I ordered one for an Rx3. are they the same?

Thanks a million,

 

yes to the bumpers, which i have a set for sale.
and i would look on ebay all the time for the brake master cylinder
every now and them you will find one. and it apprears that only rx2's cylinder will fit in there from the 71-73 years you might buy used as well.
lates matt22

 

Well I got an Rx3 master in there. The diameter is the same and the stroke is the same. It appears that the location of the port for the front brakes is in a diferent place. And the cylinder is longer too. I just rebent that front brake line to reach and it seems to be working. Im still bleading the system. Theres a manual brake proportioning valve by the drivers seat and a lot of line involved with it so its taking a while to get all the air out of it.

I will keep the bumpers in mind.

I still need to measure to see if the lake city rotaries intake will fit under the hood.

Also need to know about limited slip possabilities.

 

Well I got an Rx3 master in there. The diameter is the same and the stroke is the same. It appears that the location of the port for the front brakes is in a diferent place. And the cylinder is longer too. I just rebent that front brake line to reach and it seems to be working. Im still bleading the system. Theres a manual brake proportioning valve by the drivers seat and a lot of line involved with it so its taking a while to get all the air out of it.

I will keep the bumpers in mind.

I still need to measure to see if the lake city rotaries intake will fit under the hood.

Also need to know about limited slip possabilities.

 

i think some of the first gen LSD will fit the RX3, i know some will fit the RX2,

 

81-83 GSL.

 

Sweet thanks wacky. Any one got an 81-83 gsl rear end? lol I'll trade you my 84 gsl rear end for it. :-D

 

I just sold my last one but there's plenty of 1st gens in Socal. I will let ya know.

 

are there any that are better than others? didnt the 81-83 Auto's have a 4.1 rear or something or am i thinking second gen rx7. lates matt22

 

This car has a 84 85 tranny in it right now so its got plenty of closely spaced gears down low. Its going to be an auto cross car. I gues as long as I dont have to hit 3rd too often then low gears are ok.