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Rusty,
I'm using Atkins short manifold with a TWM TB.
The primary injectors are in the block.
I bored out the bosses on the top of the secondary runners and installed the secondary injectors directly in the manifold.
They are spaced perfectly to use the stock fuel rail.
It makes for a very compact installation.
I made plugs for the TWM TB injector holes.
I don't have much room under my cowl.
Jim Maher(not quiet ready to fly yet)
Dyke Delta / 13B
-----Original Message-----
From: Russell Duffy [SMTP:13brv3@bellsouth.net]
Sent: Saturday, April 17, 2004 6:23 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: intake ideas?
<< File: ATT00027.htm >> The question of tuned runners is 'how much is the benefit?', and 'what do
you want to give up for it'.
Thanks to you both for the comments. I think Al hit the nail on the head
with the above statement. There are so many compromises that have to be
made, particularly when you don't have much room to work with. It would be
great to see a direct comparison of a short intake vs a nicely tuned one.
AFAIK, no one has done that. I know Ed had a short intake in the past, but
I'm thinking that he changed some other major items (engine or fuel
injection system?) at the same time he changed intakes, which would
invalidate the test.
I also agree about the injector placement, and I'm starting to think the
best arrangement is either to have the primaries in the block, and
secondaries in the TB, or all four injectors in the TB on a short intake.
Since I have both a 2 and a 4 injector version of the TWM TB, I guess I can
go either way on the next iteration.
BTW, Al, did you make that intake? It's beautiful!
Cheers,
Rusty (wishing I was home where I could start working on the new intake)
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