ORIGINAL: NikolayTT
ORIGINAL: pe reivers
[link=http://home.wanadoo.nl/pereivers/regulated_fuelsupply/a_regulated_fuel_supply.html]This [/link]setup does about the same, at a fraction of the trouble you have to go to with the Webra system. Webra tries to, in a simplified way, reach the results of fully computer controlled lean burn modern automotive engines. I would call that a pipe dream. Nice to fill an idle evening with. It is not economical feasible to incorporate such a system in our model engines, unless a two servo system can be programmed into a pic-processor BY THE MANUFACTURER, and not by the end user. The engine then comes with a carb and two servos as one unit, not to be tampered with. (or equivalent system)
It seems then even simpler than Webra solution would be to use a "Smart" On-board Glow Plug driver.
Because the changes in RPM will change the Glow-plug Temperature, that will be "printed" on the Ohmic
Resistance on the Glow Plug and so on.
I.e. the Question is then:
- Is there well programable Microcontroller inside of some glow-plug-drivers which can be used to
optimise the Engine in the Air, especially in that Upoad RPMs, instead using for that
the Webra system ?
I guess in the Gas-engines that is well in use for the electronic Ignition to advance the
spark timing. Thus, those better electronic ignition systems have such Inteligent feature
inside of the Ignition Micro-controller ?
Nick
The idea is nice but experience and theory shows -- that the way the glow plug is involved in firing an alky fuel - does not lend it'self to changing the TIMING of the burn.
first - increased revs in downlines is not a power increase -
If you are after more power -- use a spark , as it does not respond to increased temp/pressure in the engine.
Glow ignition does -which is why the fiddlin with lowered compression/thicker element wire /buried elements -on n on - to try to optomize the glow setup.
Experience -again has for me shown the spark setup with a little nitro n alky to be the easiest setup to produce the most usable ,controllable power.
the bi tch is that getting the carb right is tough as typically the existing carbs will not balance correctly , the fuel to air ratio -with a tuned exhaust .
The best setup I found was a closed loop system , using exhaust pressure from the pipe to increase pressure at the tank- enrichening the mix as the power (andheat ) sharply increased - self regulating and it DOES work -unlike some of the horribly expensive POS systems offered by various engine mfgrs.
On my setups this increase in pressure was on the order of 3/4 psi ( measured ) -for best results
the result was a perfectly smooth tractable power band from 1500-9000 static and not a lot of unloading in the air as the pipe acted as a governor
engine used ST2300 and propped with 18x8
which likely means little to any one but me anymore --