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Hi Don,
I didn't have very much blow by at all. I forgot to put a hose on the
little tube from the oil fill tube and didn't notice anything coming
from that area. It seems like you might have a seal problem
somewhere that' letting combustion gasses get into the crankcase. I
don't hold myself out as an expert on rotary engines though and I'm
sure you will get better info from others on the list.
I tried a small plastic fuel filter to try to dampen pulses in the MAP
readings, but it didn't seem to help much. My intake is a simple log
about 3 inches dia. with short runners to the ports. I put the MAP tap
in the back wall of the log. I'm planning on moving the sensor tap to
the two unused injector holes in the center iron 'T'ed together.
If you have a 2 blade prop running at 2000 rpm, you would be getting
4000/60 = 66.67 pulses/sec or one every 15 milli-seconds. I think that
would average out on the MAP readings so that it wouldn't be noticeable.
Bob W.
On Wed, 6 Feb 2008 13:35:49 -0600
"Don Walker" <drwalker@gbis.com> wrote:
> I haven't figured out the engine mis yet, but it may be somehow related to the fact that the intake manifold pressure is all over the place. With the top cowl off, at 3200 rpm I am getting a range of 12.6 to 13.7. With the top of the cowl back on, it's a little higher. Can't remember exactly. I got thinking about this and figured that there is a manifold leak. I did pressure test it and fixed all the minor ones before I cranked it over the first time. Then I remembered that some people had to put dampners in the line to damper what I think are pulsations from the prop. My throttle body is only 4 inches from the prop. Couldn't find anything in the archives about this, so picked up 2 Brigs and straton aftermarket fuel filters to see if this will do the job by putting them in the MAP line to the EC-2. I'll try them out this weekend. I'm fixing the obvious stuff first and then moving to the difficult stuff. All plugs firing well in mode 8. Still getting the mis at all RPMs. I will see what happens after the dampners. Anyone have any other suggestions out there? Also, I am getting a fair amount of blowby out of the crank case breather tube at 4500rpm. What are others doing about this. Again, nothing in the archives.
>
> Don Walker
> RV-Renesis
> N113BR
--
N93BD - Rotary Powered BD-4 - http://www.bob-white.com
3.8 Hours Total Time and holding
Cables for your rotary installation - http://roblinstores.com/cables/
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