Tracy Crook wrote:

 A popular mod for flying rotaries is to install a spacer under the oil
bypass valve to disable it.  The piston in the thermal pellet is usually
removed when doing this.

Another popular mod is to install the Racing Beat under drive pulley on

the

crank to slow down the waterpump and alternator.

If the spacer was made to fit the stock pulley before changing to the
aftermarket pulley, the bypass valve will be in the incorrect position

due

to differences in the pulley.  This results in low oil pressure, similar

to

the blown out O-ring in the front cover.

This problem has shown up in at least three engines, Jerry Bass' being

the

latest.  If you experience low oil pressure on a newly built engine,

check

this as a possibility.

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

-Bill Hyde wrote:

Tracy, in your book you used a spacer 5/16 in. long. What would be the
proper length using the Racing Beat pulley?
Bill Hyde

 
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