> Posted for "Marc Wiese" <cardmarc@midsouth.rr.com>:
> Yes, it looks like it is the same but I haven't measured the openings.
> I'm just too lazy to go out and look at my 13Brews and the 20B (packed
> up ready for my house move).  BTW, the pump housing on the 13Brew is
> quite a bit "lower" than the 13Bs before 1993, and should be easier to
> modify for lower profile. Is that the thought you other 93+ engine users
> have mulled on?
>
> I could send a picture of the 93+ pump housings if you would like to see
> them. They 'might' fit pre 93 engines-I can't verify that, I rebuilt and
> sold my 1991 engines.
>
>    Marc Wiese

Oops.  Marc is right, the 13B pump housings will bolt right up to the 20B.
There is an 'extra' threaded hole on the intake/exhaust port side of the
engine for the WP housing (The bottom hole is the correct one) and I
happened to choose the wrong one on the trial fit yesterday.  This causes
several other holes to not line up right.

Another piece of rotary trivia.  The front 13Brew end housing is the same
part as the 20B except that the tension bolt holes have not been drilled all
the way through as required on the 20B.  There are only two 'real' 20B parts
on my 3 rotor.  The rest are 13Brew.

Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com