Marc Wiese wrote:

Interested info found about 20b engine series nos (I had heard about
troubles with early 20B's years ago, but never in this type of "Series
nos " presentation: all you 20 b guys, what is your series? Don't know
what this "reinforced housing" is all about.

Eunos Cosmo 3 Rotor, 20B engine 280 HP stock
Hard to get "B" series serial #B 393, this is not one of the junkyard

0

series, or "A" series. comes with reinforced rear plate(end housing),
and reinforced center housing.

I'll have to take a close look at mine. The guy I bought it from said
it was one of the good ones. At this time I have no plans to use it.
How can you tell if it is one of the reinforced ones?

Paul Lamar

Paul,

As you were aware, there were problems with the early 20Bs-the eccentric
shaft would crack due to flexing at the center housing, so some sort of
fix was made. In fact, I think Mazda has had to replace a lot of those
original engines due to warranty work way back when. I had my number of
my engine, lost it in the hard drive crash---. I think the number you
seek in on the front cover someplace (maybe covered by the water pump),
not on the rotor housings-there are numbers everywhere on these engines.
Perhaps our Aussie friend can fill us in on these matters? I know the Oz
guys also know about this, the ones who make the new eccentric shaft.
Marc Wiese

Had a long talk with Dave Lemon owner of Mazdatrix today about this and
he said there are no reported problems with 20B shafts. He sees alot of
them.

Never the less, the first series of the 20B engines lasted only about 20-30,000 miles because of the problem. Those engines were recalled. We need to clarify the engine series numbers for the 20Bs.....
Marc Wiese

One guy now with Mazdatrix was with Jim Mederer right from the beginning.
If there are such three rotors out there they are probably long gone.
They were used in road race cars as far back as 1990. Why don't you call Jim
and ask him what he knows.

Paul Lamar
 
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