Re: Jet Sizes????????

Posted by Jack Richard on May 15, 1998 at 21:00:21

In Reply to: Jet Sizes????????
posted by Steve Watrous on May 15, 1998 at 19:50:00

Steve-
I am not sure what the numbers really indicate, but they are probably derived from metric measurements since the Zenith uses metric threads on the jets.I do know that the #11 orifice should be .021" (#75 drill), the #19=.035"(#65 drill), the #20=.037" (#63 drill).A more important figure is the flow which the jets allow with 36" of water pressure.The main jet should allow 140 to 150 cc/min., the cap jet = 150 to 185 cc/min., the compensator jet = 138 to 142 cc/ min. and the idle jet = 44 to 48 cc/min.Steve Pargeter wrote a fine article on flow testing jets in one of the past issues of The Restorer.Good luck.
: I know that one or more of you out there can tell me how to convert the numbers stamped on zenith jets to diameters, either in inches or millimeters (even furlongs).I'm desperate to find this info.
: Best Regards,
: Steve

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