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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Need advice on pressure line plumbing
11-13-2005 12:00 AM  14 years ago
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HELI3DFLYR

rrApprentice

Hamilton, Ontario, Canada

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Need advice on pressure line plumbing
OK Guys/Gals, I need advice on pressure line plumbing. I recently put a OS91SXH into my heli and plumbed the lines as advised by someone, I ran the line from the pressure nipple on the backplate to the main tank, and closed off the nipple on the pipe. My problem is that there is so much pressure that the motor runs horribly, will not idle for more than 4 seconds and is almost being put into hydrolic lock by the amount of fuel being pushed inside. This is my first motor with a pressure nipple on the backplate, how do you guys plumb your systems? Any help would be appreciated.

Cheers,

Alex
MinAir 1005SE Gasser, Align T600E, T500E GF, 450SE V2
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11-13-2005 12:09 AM  14 years ago
bathmagic

rrVeteran

Berwick,Victoria, Australia

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plumbing
os91sxh with a pressure nipple on the back ????


i have had that engine a few times and mine have never had a purssure nipple in the back plate at all.

was it a secondhand engine that did have a perry pump on it ?

if it was my advice is to block off the back plate nipple runn a line in from the muffler into the tanks and one line to a hedder tank and then to the motor.

I would imagine that your motor has only on neddle on the side and a small screw witch is your idle mixture adjustment

let me know how you go

Dale
ENV - Still laying it down !….Ohhh yeh !!!
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11-13-2005 12:11 AM  14 years ago
darrens

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United Kingdom

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sorry if this is a suck eggs question, but do you have a pressure regulator on your carb???He who dies with the most toys is the winner!
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11-13-2005 12:30 AM  14 years ago
HELI3DFLYR

rrApprentice

Hamilton, Ontario, Canada

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Thanks for the quick response gentlemen,, the carb I am running is a 60L, I am not sure if it has a pressure regulator or not, how would I check? This is a second hand OS91SXH, but it looks brand new, the RR member I got it from hardly used it (Thanks again Heli_Gal!!! ),, so basically the pressure nipple on the backplate should only be used for a pump? Can I add a regulator? I kind of semi-permanently plugged the pressure nipple on my Hatori so.... suggestions would be much appreciated.

Cheers,

Alex
MinAir 1005SE Gasser, Align T600E, T500E GF, 450SE V2
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11-14-2005 12:32 AM  14 years ago
darrens

rrKey Veteran

United Kingdom

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The pressure nipple on the backplate can be for 2 different applications;

1. It powers a pump. The pressure pulses power a pump, which deliveres fuel to the carb. It basically saves the carb/engine from having to suck fuel in and therefore the feed "should" be more constant (I tried this with a Perry pump and hated it, opting for option 2 below which has been great so far). You then have a T piece in the fuel line just before the carb with a return to the tank for fuel which was not needed and therefore have a circulating fuel system. With this, you still have the nipple from the exhaust providing low level positive pressure to the fuel tank.
2. It provides a higher pressure (higher than that from the exhaust) to the fuel tank. This fuel is then supplied to the carb via a pressure regulator which you would see on the side of the carb (or in the box!). The nipple on the exhaust becomes redundant in this situation and has to be closed off. One of the best versions of this is the OMI kliene mod available in the States and can be done in conjunction with a big bore modification on the carb for additional power. I would recommend this highly
There are a lot of posts on this mod in RR so have a look

I hope this helps
He who dies with the most toys is the winner!
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11-14-2005 03:26 AM  14 years ago
HELI3DFLYR

rrApprentice

Hamilton, Ontario, Canada

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Thanks for all the help guys, I have re-done my plumbing, and the motor runs great (just like every other OS I have ever owned!!).


Thanks again.

Cheers,

Alex
MinAir 1005SE Gasser, Align T600E, T500E GF, 450SE V2
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