X-Mozilla-Keys:                                                                                 
BruceT2598@aol.com wrote:

In a message dated 10/20/99 1:36:16 AM Eastern Daylight Time,
rotaryeng@earthlink.net writes:

 Thanks Bruce. I will think about it a bit and get back to you.
 I think it is a good idea because if you buy a late engine
 you take a chance on the rotor housing at least and maybe the
 rotors.

 All I really need is the parts as I think I am going to try
 ceramic apex seals and Teflon coated coolant O rings.
 What year did they start machining the low compression bath
 tub in the rotor faces? (87)

The 87-88 turbo II's ran a compression ratio of 8.7 to 1 and the  >>89-91's were  bumped up to 9.0 to 1
Bruce Turrentine

Here is the story I have Bruce. The 87-88 bath tub depression in the
rotor face was as cast so they lowered the compression to
accommadate production variations. The 89-91 were machined so
quality control was much better and they are all 9 to one
instead of some being 9 to one and others being 8.6 to one.
I guess we could cc them much like people do with cylinder 
heads.

BTW make me up a list of new and used parts to save the $1100
bucks and I will send you a check. If you don't have a list
I will try to work up one and send it to you for editing.

I would like to use the machined rotors if possible but
I can always CC the older rotors. That means of course 
one would wind up with a compression ratio of the lowest 
rotor face out of two rotors. I would prefer of course
to have the late 9 to one with machined bath tubs.


Paul Lamar
 
The Aircraft Rotary Engine Newsletter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org