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HelicopterEngines Plugs Mufflers Fuel › the correct rpm for max hp in ys80? and......
04-25-2002 09:49 PM  15 years agoPost 1
av8er

rrApprentice

NH, USA

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Hi, I'm flying a fury (8.45 ratio) with ys80 and 700mm blades, coolpower 30% os8, hatori 80/90 2 piece, ksj header tank, governer. I read some posts, but couldn't find what I needed. (Setup GV! with new ratio and 1700 headspeed)

In the book with engine, it says max rpm is 17000, but what is the best rpm for most HP? I'm running the 8.45, so at a 1700 head speed, the engine is only at 14365. Hmmm?

I intially started at recommended starting settings, but it was REAL smokey. Only had a chance for 2 tanks b4 dark, slowly lowered my needles down to 1.25 hover and .9 full, but still had some rich symptoms. Dont want to blow up the engine but........

hover was a little rough.....could see it in tail and hear it.....skip a little, how lean should I go....it seems i'm already at the bottom of recommended range, but it still smoking good, I have nothing to compare it to except my 60 on same fuel smoked a lot less. Also throttle didn't pick right up when I gave it hard collective from hover, very slight delay. And it sounded like it was overspeeding a lot in fff with any nose down, I will tach it this weekend. What do u think average flight timeshould be with a small ksj header tank once the engine is dialed in?

Thanks for info...

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04-26-2002 02:09 PM  15 years agoPost 2
Dirty

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Des Moines, Iowa, USA

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Manual settings

Pay no attention to the recommended settings.....they are wrong!!!! I am running my YS80 at: High speed - 0.9 open; Mid - 0.9 to 1.1 open (depending on weather); Low - around 3/4 open (I think). Basically your mid range setting is probably way too rich. Lean it up like four clicks and see what happens.....this engine will let you know right away if you are to lean. The low end screw seems to be prettly sensitive so it may also need some adjustment.

Good Luck
Darren

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04-26-2002 02:22 PM  15 years agoPost 3
z11355

rrMaster

New England

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you should be aiming for about 15-15.5K RPM

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04-26-2002 03:52 PM  15 years agoPost 4
BladeRunner

rrElite Veteran

Ontario Canada. Member of "some sort" s

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YS 80?

I don't have an 80, but I have read some info about the spray bar in some 80's not being right.
Also something about the wrist pin CLIPS being too long, breaking and trashing the engines. The fix is to send the engine back and they will exchange the spray bar with one from the 61 engine, this is supposed to clear up the mid range rich problem. Some one said you can chase the mid range all day and never get it right.

While the engine is back for repair they will also fix the wrist pin CLIPS.
As I said I don't have an 80, but this is the info I got. FWIW.

I have edited this post to correct an error, I said wrist pins.......and should have said wrist pin CLIPS......sorry for any confusion.

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04-26-2002 04:07 PM  15 years agoPost 5
Taipan

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Sydney, Australia

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Is that why some guys have swapped their barrels for the 61 ones?

I've yet to get a monster engine, the jury is still out wether to get the 80 or 91.

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04-26-2002 05:11 PM  15 years agoPost 6
BladeRunner

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Ontario Canada. Member of "some sort" s

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YS 80

Well, I know of one guy with only a couple of gal through his 80 who had the "fat" mid and he tried to lean it out to clear it up and trashed the engine, a second guy from the same club had his engine go a few days later.... I think--not sure though, that his had the wrist pin clips let go ( I heard the clips are too long) and trashed the bearings.

What I was told is that Perfomance Services was fixing the engines, (Provided they are not "Gray market" of coarse) and while they were at it they are changing the spray bars to the 61's bar. This is supposed to fix the mid range tuning issues. Keep in mind this is second hand info......your milage may vary.

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04-26-2002 05:44 PM  15 years agoPost 7
Dr.Ben

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Richmond, VA, USA

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Here's the first hand story:

The majority of pilots that have experienced the mid range burp while inverted or at zero d. pitch have been using governors, myself included. I know David Harkey has not had the problem on his models not using the GV-1. Others will agree.

The solution to the problem is to replace the carb barrel with the one from the STII. Perf. Spec. will do so under warranty for US purchased engines. Send in the old one barrel, and they'll swap you for a STII barrel. All new YS80's coming into the US now have the STII barrel in them.

I found the old 80 barrel to meter beautifully in hover, even better than the STII barrel. The burp was not acceptable with the GV-1 on, though.

For certain, you cannot lean the burp away by cranking in on the hover and/or high speed needles.


Ben Minor

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04-26-2002 07:15 PM  15 years agoPost 8
Dirty

rrApprentice

Des Moines, Iowa, USA

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I have replaced the 80 throttle barrel with the 61 STII barrel and it now works marvelously. Tons of power......the engine and rotor gain rpms in a 12 degree pitch climb out.

I have not heard about the wrist pin clips though.....but I have seen an 80 go due to something gouging up the piston, sleave, and ring. hmm.........I wonder if that is what it was.

Darren

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04-27-2002 03:36 AM  15 years agoPost 9
av8er

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NH, USA

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thx i do have the updated engine....the new ones come with a 1/4 inch off barrel plastic throttle arm.....if u would like to see there is a bad picture under me gallery...display all.

Seems to be running better, i cranked the head speed upto 1770. Haven't done much with the needles, acutually a little richer until I put some more fuel through. So what head speed u guys finding working well with 8.45 ratio? That seems a lot better than 1650-1700.

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04-27-2002 05:39 AM  15 years agoPost 10
sluggo

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Kitchener Ont

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Dirty I would lay money on that being a rist pin clip that went through the engine. We have had two motors let go here do to this. Both engines had less then 4 gallons!!!!!!!!!!!!

Only one had trouble with the rich spot and the other even with a gv-1 did not have any trouble tell the clip let go.

Both engines are on there way back to ys to be rebuilt

Chris

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