Paul,
Is the leaking throttle slide a permanent fixture ? Or just for the
dyno ?
If it's to be the final, maybe back to the drawing board for a less
complicated installation,
i.e., with out the gaskets and pro-seal, etc. Such as tilted at 45 so
the fuel runs into the
engine (yes I know about washing down the surfaces with raw gas). And
then with a drain.
I remember some factory installations with a small (1/8) tube that
was at the lowest part of the intake to drain away raw gas when that
happened to them.
Of course what you have experienced does not happen on cars..........
And what are the chances that it will EVER happen again to this install ?
And if it did, when ? Or why ? There must be a simpler way..........
Kevin
Well I don't really know why it happened. We will know more
tomorrow when Tracy has a chance to look at it.
It is a very unlikely scenario as the switching transistors in Tracy
computer must be shorted or on for this to happen.
Usually switching transistors don't fail shorted.
They fail open most of the time. The wiring appears
to be correct.
Moving the slide throttle to 45 degrees is possible
and would help only slightly. It is preferable to
have the fuel go in the engine as that can be fixed
rather easily with a peripheral exhaust port. A side exhaust port
(RX8) is a little more difficult as you must pass a tube in through
the leading spark plug hole and suck the excess fuel from the bottom
of the rotor housing.
The gaskets are necessary as the slide throttle (ST) must be taken apart
to remove it from the engine. Unless of course you put the rubber hose
connection on the other side of the ST next to the engine.
In that case the ST is further from the housing which is less desirable
for idle reasons. I think the gaskets are an easy solution
and can replace the shims we are using now. Perhaps a bit of Hylomar
is also called for.
McMaster Carr page 3173 1/64" thick Handy Sheet Gasketing
450 F. 12" by 36 inch sheet $4.03 each. Mineral filled acrylic
nitrile binder good for fuels and oil. Max pressure is 5000 psi.
Paul Lamar
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Hi Paul,
Sorry I can't send you a drawing (unless a fax is OK) at the moment. If I
had all of the dimensions on the port bolt holes and sizes I could probably
make it faster. For now...I imagine you have used one of those noisy weed
cutters with a small 2 cycle engine. The engine choke is a very simple wedge
shape piece of metal that swings over the carb venturi. I propose a similar
idea.
Sure Teflon is cheap but that is not the point. Concerning your present
design if you had circular rings on both sides of the throttle plate that
were recessed into the housing or manifold for that matter then the plate
could be made of any metal. Teflon is hard so for clearance sake the
circular rings would only have to protrude about about 0.3mm to give enough
clearance. If the throttle plate was 1mm thick than the side gasket would
have to be 1.6mm thick when compressed. You can also make the gasket out of
Teflon to give the slide plate something to slide on. Yes it is now more
complicated because you have to mill a hard plastic gasket.
This is the point I started to think about small dual wedge shape throttles
plates swinging over each port. All Teflon parts can be me rapidly on a
lathe. The throttle plate shafts run through the throttle housing and
through attached arms (on the outside) are caused to rotate via a linkage.
If both swung toward the center (one arm up and the other down) connected
through a dog legged linkage, the whole unit would become very very small.
...... So sorry.... but that is my Japanese design sense wanting to minimize
everything again:)
I am willing to make it and give it to you for testing purposes if you don't
mind it being in stainless steel. Your P-port experiment has peaked my
interest and it seems the EC-2 controller I ordered will be months away from
arriving so my own engine testing is on hold.
Question: Does the throttle plate have to ever be completely closed?
What throttle position does the P-port idle at. 1/4 area open?
Doug in Japan
I'll know more in a few days. I think we have the problem solved
with the computer. I think we grounded things improperly.
It is premature to redesign it at this point.
Paul Lamar
The Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site.
http://www.rotaryeng.net
Copyright 1998-2005 All world wide rights reserved.