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Forum: Glow Engines

11-25-2006, 06:55 PM

Replies: 89

Why Are Nearly All Kits and ARFs Incorrectly Designed?

Views: 6,123

Posted By downunder

RE: Why Are Nearly All Kits and ARFs Incorrectly Designed?

By doing this the tank acts like a uniflow until the fuel level drops to half full and then uncovers the end of the vent line. From then on the tank is normally vented and the engine will feel the...

Forum: Glow Engines

11-23-2006, 10:42 PM

Replies: 89

Why Are Nearly All Kits and ARFs Incorrectly Designed?

Views: 6,123

Posted By downunder

RE: Why Are Nearly All Kits and ARFs Incorrectly Designed?

Your maths are spot on and explains exactly why an engine will run a little leaner when inverted if a normal vent is used. It's just simple physics.

Forum: Glow Engines

11-10-2006, 10:00 AM

Replies: 89

Why Are Nearly All Kits and ARFs Incorrectly Designed?

Views: 6,123

Posted By downunder

RE: Why Are Nearly All Kits and ARFs Incorrectly Designed?

Once again Dar you're wrong. Even with muffler pressure the fuel will still try to flow into the vent tube when inverted and part of the muffler pressure is used to overcome this. The net result is...

Forum: Glow Engines

11-09-2006, 06:39 PM

Replies: 89

Why Are Nearly All Kits and ARFs Incorrectly Designed?

Views: 6,123

Posted By downunder

RE: Why Are Nearly All Kits and ARFs Incorrectly Designed?

First thing, who's Hugh? Oh, of course, Hugh's on first..... :D

Second thing...you're absolutely wrong, there absolutely is a difference in fuel pressure between inverted and upright with a...

Forum: Glow Engines

11-08-2006, 09:01 AM

Replies: 89

Why Are Nearly All Kits and ARFs Incorrectly Designed?

Views: 6,123

Posted By downunder

RE: Why Are Nearly All Kits and ARFs Incorrectly Designed?

I don't follow, now you're saying that even a 3" difference in head won't make much difference.
BTW, the SG of methanol is .8, nitro is 1.13 and oil is near enough to 1.

Forum: Glow Engines

11-07-2006, 09:46 AM

Replies: 89

Why Are Nearly All Kits and ARFs Incorrectly Designed?

Views: 6,123

Posted By downunder

RE: Why Are Nearly All Kits and ARFs Incorrectly Designed?

I suspect the reason the hole in the firewall is put where it is is because every engine mount I've seen has got a dirty great hole in the middle of it so you might as well make one hole match the...

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