Mazda Rotary Club

General => General Technical => Topic started by: kav on December 06, 2005, 09:33:42 PM

Title: Difference between the 13b & 12a engine
Post by: kav on December 06, 2005, 09:33:42 PM
Anyone now if their is uch difference between the 13b & 12a engine,I ave a guy who has blown his 13b engine,Rotos & housings are done,he was wondering if the 12a rotors & housings are compatabile ?
Title: Difference between the 13b & 12a engine
Post by: Brett on December 06, 2005, 10:04:29 PM
Moving this to the correct section.

The capacities are different I\'m afraid, so you will not find any similar components between the 12a and 13b derivatives.  (as far as I\'m aware any how)
Title: Difference between the 13b & 12a engine
Post by: Carl on December 06, 2005, 10:11:55 PM
The 12a rotors and rotor housings are 10mm narrower than the 13b engine,also the eccentric shaft is propotionately shorter by 20mm,and there are lots of other differences.
Regards
Carl
Title: Difference between the 13b & 12a engine
Post by: kav on December 07, 2005, 10:38:44 AM
Sorry for posting in the wrong section,one more stupid question.Could I put a 12a engine in the FD3S.would it compatiable with the FD3S gearbox,manifold etc.Thanks Guys.
Title: Difference between the 13b & 12a engine
Post by: 20B_boy on December 07, 2005, 02:21:51 PM
Quote from: kavCould I put a 12a engine in the FD3S.
You could...

Quote from: kavwould it compatiable with the FD3S gearbox.
With the use of an adaptor plate and some minor mods i guess...

Quote from: kavwould it compatiable with the manifold etc.
No, not the inlet or exhaust manifolds any way - as Carl says the housings are 10mm thinner so the ports wont match up!

R.
Title: Difference between the 13b & 12a engine
Post by: mattmaclennan on December 08, 2005, 11:59:23 PM
Still.... I like the idea. After carefull modification Tim made a HKS T51R manifold fit his 12A... One steering rack conversion later
Title: Difference between the 13b & 12a engine
Post by: 20B_boy on December 09, 2005, 11:28:45 AM
Yeah but chopping up the cast stock items and tig-ing them up to fit a 12a is going to be a bit messier than modding the tubular HKS exhaust manifold! The FD intake manifold especially - I\'d like to see u chop that up and fit it to a 12a Captain! :rollin