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Engine basics => Engine set up tips => Topic started by: Dwayne Donnelly on July 21, 2020, 03:54:09 PM

Title: Lean in outsides and inverted
Post by: Dwayne Donnelly on July 21, 2020, 03:54:09 PM: Hi guys, in general if an engine is going a bit lean in outsides and inverted do I raise or lower the tank.
Thanks y1
Title: Re: Lean in outsides and inverted
Post by: Brett Buck on July 21, 2020, 04:46:04 PM: Quote from: Dwayne Donnelly on July 21, 2020, 03:54:09 PM
Hi guys, in general if an engine is going a bit lean in outsides and inverted do I raise or lower the tank.
Thanks y1

Lower.

Brett
Title: Re: Lean in outsides and inverted
Post by: Dwayne Donnelly on July 21, 2020, 06:02:19 PM: Thanks, kinda embarrassing I really should remember this stuff...lol Anyway I was gifted this beautiful T-Bird with a enya 29, I'm using a Brodak uniflow tank that is on the engine beams, due to the cowl I might not have room to shim the engine, if not it means somehow shaving the beams, any ideas?
Title: Re: Lean in outsides and inverted
Post by: Peter in Fairfax, VA on July 21, 2020, 06:41:28 PM: It will be interesting to see what others suggest. I'd go with taking a dremel to it and gouge out a lower home for the tank, then possibly sister on some more beef to the beams if you end up taking a lot. Is that a balsa floor between the tank and beams? That could be the first to go.
Title: Re: Lean in outsides and inverted
Post by: Dwayne Donnelly on July 21, 2020, 06:57:40 PM: Quote from: Peter in Fairfax, VA on July 21, 2020, 06:41:28 PM
It will be interesting to see what others suggest. I'd go with taking a dremel to it and gouge out a lower home for the tank, then possibly sister on some more beef to the beams if you end up taking a lot. Is that a balsa floor between the tank and beams? That could be the first to go.

No the tank is on the beams. :-[
Title: Re: Lean in outsides and inverted
Post by: Brett Buck on July 21, 2020, 08:07:30 PM: Quote from: Dwayne Donnelly on July 21, 2020, 06:57:40 PM
No the tank is on the beams. :-[

Open up the tank and move the uniflow vent lower.

Brett
Title: Re: Lean in outsides and inverted
Post by: Massimo Rimoldi on July 21, 2020, 11:58:46 PM: IF what you need is very little and you have the hole of the NVA in A position of the drawing, you can turn the NVA and bring the hole in B position .

Massimo
Title: Re: Lean in outsides and inverted
Post by: Peter in Fairfax, VA on July 22, 2020, 07:16:46 AM: Interesting ideas.

The custom tank with lower pickup / vent might just work.

Moving the outlet of the NVA also might work. Depending on how much movement is needed, arranging where the hole in the venturi goes by drilling a new hole in the venturi itself could be considered, perhapos combined with tapping the case for a set screw.
Title: Re: Lean in outsides and inverted
Post by: Dwayne Donnelly on July 22, 2020, 07:35:39 AM: That should do the trick.
Thanks Bret
y1 <= #^
Title: Re: Lean in outsides and inverted
Post by: John Leidle on July 22, 2020, 08:03:36 AM: When all else fails I would " consider " raising the engine or making a thinner tank.
John L.
Title: Re: Lean in outsides and inverted
Post by: Peter in Fairfax, VA on July 22, 2020, 08:31:35 AM: Curious as to why moving the vent is suggested vs. moving the pickup.
Title: Re: Lean in outsides and inverted
Post by: Dwayne Donnelly on July 22, 2020, 08:49:49 AM: Quote from: Peter in Fairfax, VA on July 22, 2020, 08:31:35 AM
Curious as to why moving the vent is suggested vs. moving the pickup.

Moving the uniflow vent up or down will effect your engine run, I set my clunk tanks up the same way, that way you don't have to raise or lower the tank you simply move the uniflow tube up or down, I thought about using a clunk tank for the T-Bird but didn't have enough room.