"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

"Michael D. Callahan" wrote:

I missed the point on that comparison completely. Mike C.

 
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