Author Topic: Venturi size for .40 Diesel? (Read 331 times)

frank mccune · « **on:** May 25, 2023, 06:57:44 AM »

Hello all:

I am planning to convert an Irvine .40 RC Diesel to cl use. What size of a hole in the venturi would work? Could I just wire the RC carb open for cl use?

Tia,

Frank

Peter in Fairfax, VA · « **Reply #1 on:** May 25, 2023, 09:01:29 AM »

Frank,

What's the venturi ID on the r/c carb? That might suggest a starting point.

Yes, holding open the r/c carb has been done. Some carbs even ease this by allowing the idle stop to hold it open (early O.S.)

Peter

Dan McEntee · « **Reply #2 on:** May 25, 2023, 03:11:12 PM »

A C/L venturi with a spray bar through it is way different than an open R/C carb with nothing to restrict it. If going with the R/C carb, set it with the throttle closed to about 2/3 throttle for initial running and see how you like it. Just set the needle for the RPM you want just like normal.
Type at you later,
Dan McEntee

Peter in Fairfax, VA · « **Reply #3 on:** May 25, 2023, 03:45:48 PM »

Dan's got a point here. An open "true venturi" ID is different than a venturi restricted by a spray bar. As I understand it, if you calculate the "free area" carefully, the two are roughly equivalent.

frank mccune · « **Reply #4 on:** May 25, 2023, 03:57:29 PM »

Thanks for the prompt replies.

Frank

Author Topic: Venturi size for .40 Diesel? (Read 331 times)

frank mccune

Venturi size for .40 Diesel?

Peter in Fairfax, VA

Re: Venturi size for .40 Diesel?

Dan McEntee

Re: Venturi size for .40 Diesel?

Peter in Fairfax, VA

Re: Venturi size for .40 Diesel?

frank mccune

Re: Venturi size for .40 Diesel?