Author Topic: ST 51 venturi (Read 767 times)

Bob Reeves · « **on:** October 03, 2006, 07:57:11 AM »

I need to make a sprinkler venturi for the ST 51 I am stuffing in the Skylark. The stock venturi is .281 with a .156 spraybar. If my calculations are correct this results in a choke area of .018..

This seems a bit small for a .51 but this is the first .51 I ever played with so what do I know... Are these numbers correct and/or what size venturi is everyone running in the .51?

Thanks

RandySmith · « **Reply #1 on:** October 03, 2006, 11:51:04 AM »

HI Bob

The ST 51 on a true venturie, works very well using a #16 or 15 drill bit. or about 175 to 181 thou hole. If you need to you can run as small as a .169 hole, but any smaller I have found doesn't let the motor cycle, and also really retards the cycling so much it becomes a "dumb" motor, Not knowing when to cycle

Randy

Bob Reeves · « **Reply #2 on:** October 03, 2006, 01:32:17 PM »

Thanks Randy,

Exactly what I needed to get the ball rolling..

Maybe someday I will be able to afford a real PA engine

Author Topic: ST 51 venturi (Read 767 times)

Bob Reeves

ST 51 venturi

RandySmith

Re: ST 51 venturi

Bob Reeves

Re: ST 51 venturi