Delaval 73

[Cardigan99]

Any one running a gas motor on a Delaval 73?? What HP??

[SadSams]

Any one running a gas motor on a Delaval 73?? What HP??

Well, I have two Delavals. The 76 uses a 3hp electric motor and the 73 uses a 1hp electric. I have seen the 76 with a 5.5 Honda so my guess is that you could go smaller with the 73.

[Russell Lampron]

I don't remember the formula but I think that you multiply the HP of the electric motor to get the HP of the gas motor needed.

[sjdoyon]

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[maple maniac65]

Well, I have two Delavals. The 76 uses a 3hp electric motor and the 73 uses a 1hp electric. I have seen the 76 with a 5.5 Honda so my guess is that you could go smaller with the 73.

Don't forget that a vacuum pump has to turn around 1600rpm's to make vacuum consistently. A small motor has to run at a higher speed to maintain 1600rpm's. It is better to have a larger gas motor run a half throttle than a smaller run tached out. I run Gast 2565 on a 11hp half throttle and they run 10 hours on three gallons of gas.