Rotax 582
Oil Throttle
Adjustment
This Page was created
Feb. 2nd, 1999
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I have always hesitated to write the below few paragraphs for a number of different reasons. But perhaps the below could help one person some place one day... ALSO, I now realize as many of you know, seems lots of people hesitate to share there ideas n findings on their helicopters (also using the 582) between them self's due to the manufacture's unique business style (sadly I now refer to him as "the helicopter Hitler")...... And perhaps the below is common knowledge, if so sorry, I personally had to find it out the hard way Perhaps the reason is only because I am not and never have been much of a the mechanical type of guy.
For some un known reason, the Rotax 582 and ONLY this unmentionable helicopter seem to not be comparable. My helicopter (the CH-7 Angel) along with at least 135 more of it's brothers n sisters uses the SAME engine with NO problems. To date, the only fatality that I know of in the Angel was when a Italian pilot took off into the evening sun and a set of wires.......
However, even thoe the CH-7 Angel uses the same power plant, the manufacture of the helicopter (NOT the Rotax manufacture) recommends adjusting the oil throttle differently than the Rotax manufacture recommends.......
Now, I stress that the below Is NOT the way the Rotax operators manual recommends adjusting the 582's oil throttle. And the foto below is almost the way I have Miss Nina's throttle adjusted, which is ALSO NOT the way the CH-7 Angel manufacture recommends......
You may have noticed how an Angel smokes when it is started from being
cold. 
My
little Miss Nina does..... The Rotex company recommends adjusting the oil
throttle so when the engine throttle is closed the oil throttle lever is
at the left most mark (see below). The Angel's manufacture recommends the
throttle be aligned at the right most mark (hard to C
in this foto) when the throttle is closed......
Not liking how Nina's EGT were always close to the red line and almost
always touching the red in a decent, no matter how I jetted, I decided
to re adjust against what the engine manufacture
suggested and try what the air frame manufacture suggested.... Well after
doing so, my EGTs were lots better, but my plug checks were scary. Nina's
plugs were all gummy and agents All what I had been taught about reading
spark plugs and what you should be looking for...... But still the EGT
were great......
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Than it dawned on me....... I decided to do a plug check with out a
cool down... I flew Miss Nina, landed quickly and Switched
off the engine WithOut a cool down period. Seems to reason the low
RPM of the cool down period of 2 min. would be giving me plug readings
of the cool down period, Not the true readings from flight...... Any way
to make a long story, I ended up compromising and not adding quite as much
oil as the helicopter mfr. suggested. I now have Nina set almost exactly
in-between the two marks according to plug readings I was looking for.
However, with the same setting after a cool down period, still look scary,
on the virge of fowling. But when visually inspecting the plugs with out
the 2 minute cool down, all 4 plugs looked good n the EGTs were always
in the green arch, even in a shallow decent w/power.
As I stated above, this is NOT the way both the Rotax n the RPM helicopter company recommend you set your oil throttle on your XYZ 5oo helicopter..... But I use the same engine and it seems to work better this way..... But I could be wrong, don't wanta get sewed for causing your plugs to foul on your XYZ 5oo helicopter..... I just can't stand hearing about people continually getting killed and hurt.....
Glenn Ryerson, Host/WebSter @ SHnPGIE
Disclaimer.... Remember, all the above is from a guy that sells ice cream for a living, that just knowing how to use a computer....... NOT from a helicopter mechanic in any stretch of the imagination....... However, this is the EXACT oil throttle setting on my helicopter's 582....
Beam Over to the "In Defense of the 582"
page.
