Difference between A, B, C, D and E Blocks
Thread Starter
Junior Member
Joined: Mar 2005
Posts: 3
I have heard a lot of stories about the differences, but what is the truth??
Is there a big difference??
What are the differences??
Please explain it as well as you can!
And if you're not sure, stay out of the discussion!
Hope you understand my bad english...
Is there a big difference??
What are the differences??
Please explain it as well as you can!
And if you're not sure, stay out of the discussion!
Hope you understand my bad english...
Member
Joined: Jul 2003
Posts: 38
From: Sydney, Australia
Originally Posted by sillbeer' post='767674' date='Oct 10 2005, 04:22 AM
A-E are all the same. If you get one of the number only engines it was one of the originals without the updated parts.
-Destin
Wrong....................
The first 3 batches had the same end plates however, for the C-series, Mazda cast more meat onto the end plate around the top dowell to prevent cracking.
The first batch (000-999) had supect E-shafts. Mazda made a production change for the A-series & thats the only shaft you can get now. The first batches where very unreliable & most got changed under warranty.
There may be other changes that I am unaware of but they would be very minor.
REgards
Senior Member
Joined: Nov 2001
Posts: 2,284
My 20B showed signs of being messed with. The rotor housings were stamped with F, C(or M), R and the oil pan surface at the bottom of the engine had been scraped. The production number is #756. Do you think the shaft was replaced at some point?
Member
Joined: Apr 2004
Posts: 90
From: Arizona
Thanks for the correction.
I had to go back and re-read. There's alot of good info in this thread from the other forum.
http://www.rx7club.com/showthread.ph...1&page=1&pp=15
-Destin
I had to go back and re-read. There's alot of good info in this thread from the other forum.
http://www.rx7club.com/showthread.ph...1&page=1&pp=15
-Destin
Senior Member
Joined: May 2002
Posts: 22,465
From: California
Originally Posted by DMRH' post='769268' date='Oct 14 2005, 01:59 AM
Wrong....................
The first 3 batches had the same end plates however, for the C-series, Mazda cast more meat onto the end plate around the top dowell to prevent cracking.
The first batch (000-999) had supect E-shafts. Mazda made a production change for the A-series & thats the only shaft you can get now. The first batches where very unreliable & most got changed under warranty.
There may be other changes that I am unaware of but they would be very minor.
REgards
my parts book (which is an early one) doesnt show a different e shaft part number?
NF01-11-D00B is what i show, oh ok yeah NF01-11-D00C in the 97 parts book....
well i guess thats proof to the myth....
Senior Member
Joined: Nov 2004
Posts: 147
From: Europe, Belgium
Mine says D591 on al 3 rotor housings, guess I'm a lucky dude 
exept that the 2 rear side plates are garbage because of te guys who prepared the engine cleaned it of with water, and the inlet gasket on the rear rotor was broken so water came in.. rotor housings ware al 3 in exellent condition..
exept that the 2 rear side plates are garbage because of te guys who prepared the engine cleaned it of with water, and the inlet gasket on the rear rotor was broken so water came in.. rotor housings ware al 3 in exellent condition..
Junior Member
Joined: Jun 2006
Posts: 4
Originally Posted by 20B3rdgen' post='816843' date='May 1 2006, 04:30 PM
I have B029 and hope to install it in June.
I have 539 (no numbers) and have never had a problem with the eshaft.
When engine was pulled down, apex seals were faily well worn showing engine had been running for a long time without problems. All parts were perfect inside apart from the worn seals.