Differences between 20B models?
#1
Rotary Enthusiast
Thread Starter
Differences between 20B models?
As I understand, there were two 20B engines made - an early model and a later model.
Am I correct that the early model can be identified by the normal (silver) colored intake manifold, and the later model can be identified by the charcoal colored intake manifold?
Besides the eccentric shaft being stronger in the later model engine, what other improvements were made?
What year did the change take place?
Am I correct that the early model can be identified by the normal (silver) colored intake manifold, and the later model can be identified by the charcoal colored intake manifold?
Besides the eccentric shaft being stronger in the later model engine, what other improvements were made?
What year did the change take place?
#3
Moderator
iTrader: (3)
Join Date: Mar 2001
Location: https://www2.mazda.com/en/100th/
Posts: 30,832
Received 2,602 Likes
on
1,846 Posts
now has a thread on this
mike
mike
#4
Rotorhead
Join Date: Feb 2001
Location: Charlottesville, Virginia, USA
Posts: 9,136
Likes: 0
Received 39 Likes
on
33 Posts
The 20B in the Series I JC Cosmo (90-92) had a silver manifold, while the 20B in the Series II JC Cosmo (93-95) had a black manifold.
I'm not aware of any significant changes in the two series of engines, and both had the same published performance numbers. Also, Mazda lists all 20B parts as "20B" or "20B-REW", and makes no reference to year or series number. Apparently, some of the first-run engines were not made as well, but they should have all been destroyed or modified by now.
Here is the thread previously mentioned:
https://www.rx7club.com/forum/showth...5&pagenumber=1
I'm not aware of any significant changes in the two series of engines, and both had the same published performance numbers. Also, Mazda lists all 20B parts as "20B" or "20B-REW", and makes no reference to year or series number. Apparently, some of the first-run engines were not made as well, but they should have all been destroyed or modified by now.
Here is the thread previously mentioned:
https://www.rx7club.com/forum/showth...5&pagenumber=1
#6
Rotorhead
Join Date: Feb 2001
Location: Charlottesville, Virginia, USA
Posts: 9,136
Likes: 0
Received 39 Likes
on
33 Posts
Originally posted by Bridgeported
Thanks! I was just sitting here checking the thread every few hours for the past couple days waiting for your reply
Thanks! I was just sitting here checking the thread every few hours for the past couple days waiting for your reply
#7
Moderator
iTrader: (3)
Join Date: Mar 2001
Location: https://www2.mazda.com/en/100th/
Posts: 30,832
Received 2,602 Likes
on
1,846 Posts
what mazda usually does when they update something is to change the part number, and then the old number get superceded by the new. since our parts info is from the 97 catalog (but mazdacomp has a 90-91 book) they may or may not be updated.
mike
mike
Thread
Thread Starter
Forum
Replies
Last Post
FD3S_wanted
Suspension/Wheels/Tires/Brakes
4
09-22-15 06:18 PM
kkev.7788
2nd Generation Specific (1986-1992)
7
09-02-15 01:32 PM
rx8volks
Canadian Forum
0
09-01-15 11:02 PM