13b rebuild
09-26-2007, 07:46 PM
#1
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ok guys im new to this i just got an 87 rx7 yesterday for cheap and a spare motor out of a first gen my question is how hard is it to rebuild a 13b? are there special tools i need weres the best place to get oil rings and apex seals and the tools if needed. i guess what im saying is what all do i need to do a rebuild?
09-27-2007, 12:52 PM
#2
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You need a big socket to get the flywheel nut and measuring tools for end play and clearances. You will need probably a torch to get the main pulley bolt and either a flywheel lock or an impact that will do at least 600ft*lbs. Other than that its mostly basic tools, parts cleaning will be the most work and quite messy so a big tub of some sort to do that in is probably going to help
I would only use mazda internal parts especially water seals and apex seals.
I would only use mazda internal parts especially water seals and apex seals.
09-27-2007, 02:25 PM
#3
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Originally Posted by dubsrwe' post='883570' date='Sep 26 2007, 05:46 PM
ok guys im new to this i just got an 87 rx7 yesterday for cheap and a spare motor out of a first gen my question is how hard is it to rebuild a 13b? are there special tools i need weres the best place to get oil rings and apex seals and the tools if needed. i guess what im saying is what all do i need to do a rebuild?
Are you planning on using the motor from the 1st gen? I don't want to insult anyone, so my question is what motor did you get from a first gen? 12a? 13b 6port? 13b 4 port (from a 70's vehicle)? 13b 4 port (from a later turbo model)?
You may want to look into getting a cheap used motor and swap it out. You may have gotten the 87 cheap for a reason... don't get me wrong, they are great cars. But if it is not a turbo, it might not be worth the cost of rebuilding a 13b NA (unless the car is beautiful) when you can get a decent running motor for cheap... just a thought.
If not, get an 87 factory Mazda rx7 Manual. It outlines the process in step by step (outlining tools and parts needed).
10-01-2007, 05:56 PM
#4
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the motor in the 2nd gen is fine(i think lol) its a one women owner and it was serviced regularly at mazda it needs some patch work in the floors but other then that its not a bad project car. the first gen is wrote the only thing good in it is the motor all i know about it is that it is a carburetor motor and im not shure where the markings to tell me what it is are if there are any lol. i allso found another first gen that needs a motor fender and hood for 200 bucks witch i think is good, i find the coolest things around here lol.
10-01-2007, 06:04 PM
#5
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Originally Posted by dubsrwe' post='883921' date='Oct 1 2007, 03:56 PM
the motor in the 2nd gen is fine(i think lol) its a one women owner and it was serviced regularly at mazda it needs some patch work in the floors but other then that its not a bad project car. the first gen is wrote the only thing good in it is the motor all i know about it is that it is a carburetor motor and im not shure where the markings to tell me what it is are if there are any lol. i allso found another first gen that needs a motor fender and hood for 200 bucks witch i think is good, i find the coolest things around here lol.
its a 12a, it would be a good swap into another 12a ist gen or one of the older rx's. Other than that, put a Holley/ delorto/ weber on it with a straight exhaust and drive the snot out of it. It will run like a champ.
10-02-2007, 06:21 PM
#7
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Originally Posted by dubsrwe' post='884023' date='Oct 2 2007, 03:46 PM
sweet i was thinking of that lol allso is it hard to port a 12a-13b? iv ported out vw heads and its simple enough to me i was wondering how bad it is to port one of these motors.
For a 12a and with some simple grinding skills... not to bad. Mazdatrix just made an hour long video on porting and they make porting templates. But with the 12a (which only has 4 ports + exhaust) and adding a big carb, you are just adding lots of air and gas... not bad for 1.1 litres!
And if you balance it with stationary gears you can get serious rpms!
10-02-2007, 11:49 PM
#8
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Originally Posted by dubsrwe' post='884023' date='Oct 2 2007, 03:46 PM
sweet i was thinking of that lol allso is it hard to port a 12a-13b? iv ported out vw heads and its simple enough to me i was wondering how bad it is to port one of these motors.
its not really hard, but it takes a lot of time, and to get it right, all the ports need to be the same, which isnt too bad but takes a lot of time
10-03-2007, 02:19 PM
#9
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so i looked today and found that the 87 has a 13b in it and the first gen is a 12a. im haveing a problem tho i can get it to turn over(the 87) and there is spark but no fuel the pump is not running and i dont know what is wrong with it any idea?
10-03-2007, 03:08 PM
#10
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Originally Posted by dubsrwe' post='884110' date='Oct 3 2007, 12:19 PM
so i looked today and found that the 87 has a 13b in it and the first gen is a 12a. im haveing a problem tho i can get it to turn over(the 87) and there is spark but no fuel the pump is not running and i dont know what is wrong with it any idea?
The Fuel Pump or the Fuel Pump relay... is bad