"Michael D. Callahan" wrote:

    Jim's right, for the upstream injector setup to work correctly it

should

not make any turns, especially in a round intake runner, as it will

cause

fuel to adhere to the outside of the runner and defeat the purpose of
injecting it upstream to begin with. Making the runner oval shaped would
help the situation as would leaving the inside surface slightly rough in
order to energize the boundary layer a bit and keep things stirred up.

    I plan to leave one set of injectors on the housing, though for
go-arounds. You'll never get instant throttle response with everything
travelling that far. Another bit I overheard at OSH was that the F1(auto
racing) setups have two complete sets of injectors, one at the ports and

one

way upstream. If the driver stabs the throttle, the computer fires the

port

injectors until the engine catches up and then switches to the upper set

for

peak power and economy.

Tracy Crook wrote:

This matches up with what Mazda does in the car.  The secondary injectors
are further upstream than the primary injectors which are right in the port.
Mazda (and my EC2 controller) uses staged injection where only the primary
injectors operate at low to mid throttle, then open the secondaries at mid
to high throttle.   I did not have to implement an "accelerator pump"
function to get good throttle response with this setup.

Tracy Crook
rws@altavista.net
www.rotaryaviation.com

I, like Mecanair, am putting all my injectors out near the bells.
Fuel consumption to me is way more important than throttle response.
Cars, like RX-7's, need good throttle response airplanes don't.
If necessary I will add injectors and use a 555 one shot
triggered by a push button switch :-).

Paul Lamar

dsbarno wrote:

What kind of timing on the 555.

Barny

You guys remind me of the time thirty years ago when I was a young consulting 
engineer under contract to Pontiac to develop the aerodynamic spoiler package on the 
1970 TransAm Firebird. I was sitting in Herb Adams office up in Michigan
and a whole parade of Pontiac middle managers came through Herbs office telling
him why he could not have one inch wider wheels on the TransAm. Herb wanted
to go up on the wheel width from six inches wide to seven inches wide because
it improved the cornering G by 0.05 or so.

Put a pot in the 555 timing circuit and try different settings.
 
Paul Lamar
 
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