Ed Anderson wrote:

Hi Folks,

    Just finished putting the 91 Turbo back together.  Ed Heishmann, a
Florida welder recommended by Charlie Kuss, did an excellent job on my new
oil pan.  It was returned anodized in colors that were a close match to my
paint job.  Thanks Ed and Charlie.

 Turning the engine over with jumper cables the compression on the front
rotor was 100-115 psi, the rear rotor was 110-120 psi.  So things look very
good at this point.  More compression that I have ever measured on a rotary,
best my old engine had was 90 psi.  For those of you interested here is a
summary of mods and things.

1.  Side housings are new
2.  Rotor housings are the ones that came with the J91 Turbo II as are
stationary gears, front cover and oil pump
3.  Two piece, two spring apex seals were used similar (if not the same) as
Hurley's seals
4.  Hayes High Performance "O" rings were used for inner coolant seal, stock
for the outer seal
5.  Viton oil control "O" rings were used vice Mazda Stock
6.  I street ported the center housing using template from Mazdatrix (gotta
be careful not to cut into the water galley - I did that practicing on an
old housing, glad I had it to practice on!)
7.  I grooved the coolant chambers around the spark plugs on the rotor
housings for better cooling
8.  Plugged the EGR holes from the Exhaust sleeve to remove source of hot
air to the manifold
9.  Installed the injector diffuser screens on all injectors
10.  Installed 89-91 High Compression (9.7:1) rotors that I got from Bruce
Turrentine
11.  Used the 91 front and rear counterweights to match lighter weight of
89-91 NA rotors
12.  Reused 86 eccentric shaft as it had the oil control springs and balls
removed and Weber jets installed
13.  Reused Turbo II oil pump I had on 86 as it showed no wear and provided
80 psi of oil pressure.
14.  Removed stock oil pressure regulator and installed 85 psi regulator
previously used on 86
15.  Replaced eccentric shaft thermal pellet and used Mazdatrix machined
aluminum fitting.
16.  Side seal/corner seal clearance was kelp between .0015 and .0025" which
is tighter than Mazda calls for, but which several books recommend for
better compression.

Reviewed Bruce's video and checklist developed from it and used the Haynes
manual.  Bruce's video does so take the angst out of the process.  Thanks
Bruce!

Right now, I am taking the opportunity to clean up under the cowl and have
integrated the coolant header tank, coolant overflow tank and air/oil
separator into a unit that attaches to the oil pan which has a much lower
fitting for oil return from the Ross drive.

Will send some photos when I get them back.

Should have the engine reinstalled within a week or two

Best Regards

Ed Anderson
Matthews, NC

 
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