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Engine basics => Engine set up tips => Topic started by: Allen Eshleman on July 06, 2015, 07:10:29 PM

Title: Which needs to be level with Needle Valve?
Post by: Allen Eshleman on July 06, 2015, 07:10:29 PM

Which needs to go level with the needle valve opening with this tank, the tube where the fuel fuel comes out or the part of the tank that the tube runs to in the back corner of the tank?

Title: Re: Which needs to be level with Needle Valve?
Post by: Tim Wescott on July 06, 2015, 07:37:40 PM

For a uniflow tank, the point where the uniflow opens into the tank.  That tank doesn't look like a uniflow, however, so for that one I'd say the centerline of the tank.

For profiles you often want the tank about 1/8" higher than the hole in the spraybar to start, and then adjust from there.  Without muffler pressure, however, I think it's all moot: check back with us when you give up and go to a uniflow.

Title: Re: Which needs to be level with Needle Valve?
Post by: Allen Eshleman on July 07, 2015, 12:11:48 AM

This is neither uniflow nor pressure.  It is being used with a Brodak 40.  I do understand that the 1/8 above works with Fox 35's.  I don't know if it applies to other engines.

Title: Re: Which needs to be level with Needle Valve?
Post by: Brett Buck on July 07, 2015, 12:16:01 AM

Quote from: Allen Eshleman on July 07, 2015, 12:11:48 AM

This is neither uniflow nor pressure.  It is being used with a Brodak 40.  I do understand that the 1/8 above works with Fox 35's.  I don't know if it applies to other engines.

  Start with it a bit above center, then move it to make the upright/inboard laps times equal.

    Brett

Title: Re: Which needs to be level with Needle Valve?
Post by: Allen Eshleman on July 07, 2015, 12:23:24 AM

So do I start with the end of the tube at the back of the wedge or where the tube comes out of the tank?

Title: Re: Which needs to be level with Needle Valve?
Post by: Allen Eshleman on July 07, 2015, 12:53:59 AM

Sounds like center line of tank.

Title: Re: Which needs to be level with Needle Valve?
Post by: Brett Buck on July 07, 2015, 04:06:20 AM

Quote from: Allen Eshleman on July 07, 2015, 12:23:24 AM

So do I start with the end of the tube at the back of the wedge or where the tube comes out of the tank?

   Center the wedge on the engine, or slightly above. Where the tubes come out of the tank is not important.

    Brett

Title: Re: Which needs to be level with Needle Valve?
Post by: Allen Eshleman on July 07, 2015, 01:05:31 PM

Thanks Brett and Tim,

My question is answered.  Center line of wedge will be slightly above the needle aperture.