Just picked up an old skool 76 cosmo 13b
05-01-07, 01:07 PM
#27
The '71-'75 engines had a water temp sensor in the top of the intermediate plate. The NO plate, as you can see from my pictures, had an EGR port blocked off by a steel plate.
Look around the base of the oil tube. It will say either 3B or NO. Let us know.
Look around the base of the oil tube. It will say either 3B or NO. Let us know.
05-01-07, 01:41 PM
#30
Looks like a '74-'75 engine. I think the blue background around the logo was one year only. Either '74 or '75.
You won't even need to do any porting because those '74 spec ports are practically perfect right from the factory (just smooth some of the casting flash and sharp edges but don't change port timing). I'd say keep everything the same size, even the carb jets and you won't be dissapointed.
Man you got lucky. Glad it worked out in the end.
You won't even need to do any porting because those '74 spec ports are practically perfect right from the factory (just smooth some of the casting flash and sharp edges but don't change port timing). I'd say keep everything the same size, even the carb jets and you won't be dissapointed.
Man you got lucky. Glad it worked out in the end.
05-01-07, 02:08 PM
#33
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Originally Posted by Jeff20B
Looks like a '74-'75 engine. I think the blue background around the logo was one year only. Either '74 or '75.
You won't even need to do any porting because those '74 spec ports are practically perfect right from the factory (just smooth some of the casting flash and sharp edges but don't change port timing). I'd say keep everything the same size, even the carb jets and you won't be dissapointed.
Man you got lucky. Glad it worked out in the end.
You won't even need to do any porting because those '74 spec ports are practically perfect right from the factory (just smooth some of the casting flash and sharp edges but don't change port timing). I'd say keep everything the same size, even the carb jets and you won't be dissapointed.
Man you got lucky. Glad it worked out in the end.
05-01-07, 06:40 PM
#36
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Originally Posted by wackyracer
You cant use the pre-81 tranny on your 83. You should give it away to someone who has a pre-81 RX-7.
(or keep the bellhousing and sell it at e-bay).
btw, how many bottles of tylenol did that edelbrock come with.
(or keep the bellhousing and sell it at e-bay).
btw, how many bottles of tylenol did that edelbrock come with.
Very easy on the stress level and dumb *** friendly! 
05-01-07, 07:58 PM
#37
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.....or can I just use my 83 tranny? Will it bolt up? Can I use the bell housing from my 74-75 13b and bolt that to my 12a tranny.
05-01-07, 10:52 PM
#38
Shifter on a pre-81 tranny is not in the same location as the 81-85. It more like 2" forward. Yes us old school guys are using 81+ trannies but we have to notch the shifter tunnel (towards the handbrake) OR do the remote shifter mod. Now, if you use a pre-81 tranny on a 81-85 body, you have to do the opposite which will require you to fabricate a new shifter plate etc etc.
The old school bellhousing is removable so you can mount it on a TII tranny. By using doing this, there is no need to match the engine with TII flywheel including clutch assembly.
old school tranny with polished bellhousing
Now, feel free to find a 81+ in my collection of junks
Left is a SE
Right near the blue bucket is old school
The old school bellhousing is removable so you can mount it on a TII tranny. By using doing this, there is no need to match the engine with TII flywheel including clutch assembly.
old school tranny with polished bellhousing
Now, feel free to find a 81+ in my collection of junks
Left is a SE
Right near the blue bucket is old school
05-02-07, 02:59 PM
#40
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Originally Posted by mazdaverx713b
lots of excellet info in this thread!! i really think you'll get some great use out of this engine! keep us updated on the teardown.
05-03-07, 01:26 AM
#41
Hey Wacky, what about the gearbox tilt issue of '74-'78 trannies? For those that don't know, Mazda tilted the gearbox to make room for the bottom mounted starter in '74. Most previous trannies were top mount starter.
The T2 trannies are not tilted. Only the '74-'78 trannies are tilted making them incompatible with other years.
Please feel free to correct me if I'm wrong, but first please look at these pictures of the trannies in my MG rotary project. It started out as a '73 12A twin dizzy (converted to single dizzy) and then a 13B.
Heh, the whole car is tilted here. '73 top mount starter tranny
'74 bottom mount starter tranny
Nice closeup.
The T2 trannies are not tilted. Only the '74-'78 trannies are tilted making them incompatible with other years.
Please feel free to correct me if I'm wrong, but first please look at these pictures of the trannies in my MG rotary project. It started out as a '73 12A twin dizzy (converted to single dizzy) and then a 13B.
Heh, the whole car is tilted here.
'73 top mount starter tranny'74 bottom mount starter tranny
Nice closeup.
05-03-07, 10:37 AM
#43
The SP has an extra oil fill/level fitting on the 5th gear housing and no breather tube (the breather fitting is on top). Yes, I know the difference.
As for the tilt, they made up for it by tilting the receiving end of the tail housing. If you compare it to a top mount starter tranny, the tailhousing on those is not tilted.
Hmm Wacky, you may be right about the tailhousing on Cosmo and SP trannies though. Perhaps the tilt is absorbed in the 5th gear housing and the tail housing is straight. I have a Cosmo tranny, REPU 4 speed, and an RX-2 top starter 4 speed sitting in my garage. Maybe I can take a look.
As for the tilt, they made up for it by tilting the receiving end of the tail housing. If you compare it to a top mount starter tranny, the tailhousing on those is not tilted.
Hmm Wacky, you may be right about the tailhousing on Cosmo and SP trannies though. Perhaps the tilt is absorbed in the 5th gear housing and the tail housing is straight. I have a Cosmo tranny, REPU 4 speed, and an RX-2 top starter 4 speed sitting in my garage. Maybe I can take a look.
Last edited by Jeff20B; 05-03-07 at 10:46 AM.
05-03-07, 10:50 AM
#44
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Okay I gathered some info from my Philly and NJ rotorheads. According to them my 83 gsl tranny will bolt right up to this "MAZDA" motor. I hope there info is correct. Hey there is only one way to find out fore sure!
05-03-07, 11:18 AM
#45
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here are some pics of a fist year 13b, car is 4/74, 50k all original.
center iron says something like 3B by the oil fill neck.
latin you want to sell me that tranny so i can ditch this auto??
center iron says something like 3B by the oil fill neck.
latin you want to sell me that tranny so i can ditch this auto??
05-03-07, 11:40 AM
#46
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Originally Posted by Midwest 7's
here are some pics of a fist year 13b, car is 4/74, 50k all original.
center iron says something like 3B by the oil fill neck.
latin you want to sell me that tranny so i can ditch this auto??
center iron says something like 3B by the oil fill neck.
latin you want to sell me that tranny so i can ditch this auto??
The carb is already spoken for. As far as the tranny goes PM me and lets work something out...I dread shipping.
05-04-07, 09:53 AM
#47
Im not a fan of a hitachi carb. I usually replace it with a RX-2/3 carb and if you need 13-B headers, I have several to trade for your 12-A. My son is ready for headers in his FB and I dont feel like mocking with my other 13-B's. (told him to take it one step and a time before he can go fast). LMK
Last edited by Siraniko; 05-04-07 at 10:05 AM.
05-04-07, 10:12 AM
#49
Originally Posted by Midwest 7's
will an rx7 13b header fit the wagon?
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