20B Series
#1
Senior Member
Thread Starter
20B Series
Hi;
Ive got a question about the different block series of the 20B, whats the differents between A, B C and D?
Can anyone explain it to me please.
Thank you
Ive got a question about the different block series of the 20B, whats the differents between A, B C and D?
Can anyone explain it to me please.
Thank you
#5
Senior Member
REgards
#10
Lives on the Forum
iTrader: (6)
From the "What 20B# Do You Have?" thread on this forum (https://www.rx7club.com/showthread.p...light=what+20b) :
This is a basic way to understand your 20B engine
000 - 999 = 1st batch
A000-A999= 2nd batch
B000-B999= 3rd batch
C000-C999= 4th batch
D000-D999= 5th batch
E000-E999= 6th batch (only heard of these, never seen one)
I have never heard of an F-series. Since Mazda made just under 4000 20B version Cosmo's I can also picture that the E-series was for warranty replacements if they exist at all.
If the engine has black on the rotor housings & the batch number stamp isn't on there, then its an internal factory rebuilt engine. (meaning its been out in a car & returned after failing within the warranty period)
The last engines to go into a car would have stopped around "D500" for fitment into a Cosmo. For example.........
The last Cosmo sold by Mazda = JCES-100633
However, Mazda quote selling just 369 examples of this series-II version so how it got to #633, I really don't understand.
The latest Cosmo we have ever imported is JCES-100309. Its engine batch # D442 It was a AUG-95 car & production ceased in Sep-95.
If you have any quiries then conact us via http://www.dmrh.com.au
The A series engines were prone to failure because of weak intermediate irons. This was corrected early on in the B series engines.
This is a basic way to understand your 20B engine
000 - 999 = 1st batch
A000-A999= 2nd batch
B000-B999= 3rd batch
C000-C999= 4th batch
D000-D999= 5th batch
E000-E999= 6th batch (only heard of these, never seen one)
I have never heard of an F-series. Since Mazda made just under 4000 20B version Cosmo's I can also picture that the E-series was for warranty replacements if they exist at all.
If the engine has black on the rotor housings & the batch number stamp isn't on there, then its an internal factory rebuilt engine. (meaning its been out in a car & returned after failing within the warranty period)
The last engines to go into a car would have stopped around "D500" for fitment into a Cosmo. For example.........
The last Cosmo sold by Mazda = JCES-100633
However, Mazda quote selling just 369 examples of this series-II version so how it got to #633, I really don't understand.
The latest Cosmo we have ever imported is JCES-100309. Its engine batch # D442 It was a AUG-95 car & production ceased in Sep-95.
If you have any quiries then conact us via http://www.dmrh.com.au
The A series engines were prone to failure because of weak intermediate irons. This was corrected early on in the B series engines.
Last edited by David Hayes; 08-28-08 at 08:16 AM.
#11
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mine was not a rebuild
#14
Lapping = Fapping
iTrader: (13)
No letter. It's an oldie. That's why I've got to open it up to check out the shaft to see whether it's been upgraded because the engine shows signs of possibly having been rebuilt. If it's the old style shaft I won't even bother boosting it. It'll go into a 1st gen NA so it ought to last a long time and make plenty of power in the chassis.
#18
Resident Know-it-All
iTrader: (3)
you want a B,C,or D
The 0 and A series had weaker castings around the factory dowel pins, meaning they break under high boost and/or detonation.
I have broken mine twice at 18-20 PSI (600+WHP) due to wastegate issues. Fortunately, welding technology has progessed to where even cast intermediate irons are repairable. I haven't had any problems with the e-shaft.
Pat
The 0 and A series had weaker castings around the factory dowel pins, meaning they break under high boost and/or detonation.
I have broken mine twice at 18-20 PSI (600+WHP) due to wastegate issues. Fortunately, welding technology has progessed to where even cast intermediate irons are repairable. I haven't had any problems with the e-shaft.
Pat
#20
awesome thanks!
one more thing,
could someone tell me which thread would be right to ask about buying a 3rd gen RX7 and putting a 20B in it?
i looked around and im confused of which thread to ask that in...
thanks!
one more thing,
could someone tell me which thread would be right to ask about buying a 3rd gen RX7 and putting a 20B in it?
i looked around and im confused of which thread to ask that in...
thanks!