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Hi Dave,
My primary tubes are 1.25" Dia and the total
length from intake port to TB is 21". My secondary tubes are 1.5"
Dia and total length from secondary intake tube to TB is 22". The tubes
(which are actually tubes within tubes - adjustable in that they slide inside
one another) are only 9 " long but can extend to 11". I used the stock
lower manifold (with a lot of metal carved away) and 1/2 of the middle
manifold. I cut off the stock stuff right after the middle manifold makes
a 90 deg turn, mill out those hose for my tubes and braze the tubes to the
casting.
Here is a photo of my first small tube intake (on the
left) - worked just fine but used the Stock 13B TB which weighs close to 5 lbs
and the TB mount/plenum was a metal box containing a fiberglass set
of tubes clamped between metal plates.. The second intake (on the right)
has the polyurethane casting TB mount and shows the tubes extended.
The TB was changed to a 65mm dia Mustang TB weighing 10 oz. This photo
also shows the middle stock manifold I cut off after the 90 deg turn and stuck
in the light-weight tubes. That, of course, bolts on to the stock lower
manifold not shown here.
Both worked equally well, but the new one on the right
weighs 11 lbs total compared to 21 for the old one on the left.
Ed
----- Original Message -----
Sent: Saturday, June 02, 2007 9:27
AM
Subject: [FlyRotary] Re: Lynn's Tuning
Summation was: [FlyRotary] Re: PP Ve??? was Re: Intake CFM air flow
So for my priorities, I concentrated on
trying to achieve best power at take off rpm - around 6000 rpm. The
longer length and smaller diameter tubes give the engine lots of oomph in
that rpm regime. Clearly if you wanted an all-out air racer you would
more likely choose shorter bigger tubes.
Thanks
again for the great
summation.
Ed
Hi
Ed,
what is the length and diameter of you tubes?
TIA, Dave
McC
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