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Tracy:
The three Mikuni set up works, as you and and Fin
Lassen have proven so that is always my fall back if I choose to stay with
carbs.
Mixture distribution issues apply to the Corvair
conversion with its long runners, low mounted carb and its six cylinders.
Those with individual cyl head and EGT probes have noted some great variation in
indications between cylinders. In order to correct this some of the
folks have played around successfully with the "Tornado fuel saver" device
theorizing mixture distribution as the source of the problem. A little fan
shaped insert that swirls the mixture after the carb and it may be something to
look at in this case. In the end it may just be a mater of building it and
see what it does with no or minimal expectations.
It will be a good point to consider when
assessing performance.
thanks:
Michael
----- Original Message -----
Sent: Friday, March 21, 2008 7:28
PM
Subject: [FlyRotary] Re: Gravity fed
carb? peer review
A big factor in carb manifold design is mixture
distribution. Not always easy. That was the object of those
horrid T shaped junctions seen on some aero VW conversions. Really
bad turbulance and pressure loss but it mixed up the mixture pretty
good. The advantage of using separate barrels (or carbs) for
each rotor is that mixture distribution is assured.
Aside from that, your runners are very short so not a lot of ram tuning
effect. The long single runner from the carb doesn't count as it
contributes nothing to tuning. But if all you need is 150 - 160 HP
it will work OK (assuming you do get good mixture distribution).
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