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HelicopterMain Discussion › piston locker tool....
03-07-2006 04:03 AM  11 years agoPost 21
bustedmp

rrVeteran

Shamokin, PA

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I have always used auto trans fluid to fill the combustion chamber and cause a hydro lock when tightening the nut on the crank for all of my glow engines in my 1/8th buggies, 1/10 nitro trucks, and my last heli. Will do so when my new heli arrives friday as well. The fluid stops the piston just past the exhaust port about half way up the cylinder at a point when the connecting rod has the most mechanical advantage over the crank. The atf also give the engine a nice prerun lube job.

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03-07-2006 08:29 AM  11 years agoPost 22
nivlek

rrProfessor

Norfolk England

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Bustedmp ,
That method must place an unholy strain on the gudgeon pin (as does the piston punch).

At the end of the day , it gets dark .

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03-07-2006 09:29 AM  11 years agoPost 23
racingstripe

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Sacramento, CA

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To elaborate on what Mr. nivlek says...

OS claims 1.9hp from the 50hyper at 17000RPM.

The average torque produced, based on the hp & RPM figure is somewhere around 8~10 ounce/foot.

Say you apply 10 pounds/foot (160 ounce/foot) when tightening the fan hub nut whilst using a piston lock or string or ATF, etc.

That's about 20 times the amount of torque subjected to the piston, piston pin, conrod & crankpin.

andy-

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03-07-2006 09:39 AM  11 years agoPost 24
Sprokkel

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Arnhem netherlands

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ok Guys,

its clear to me, i shall not use it anymore, i hope the engine will live for at least a year.. it's a new os hyper. i did not put much torque on it, and just used a t-wrench so not a wrench with a pipe of one meter on it :d

i think that cause of the end of the piston locker tool is made out of plastic it wil absorb some torcque.

kind regards,
Sprokkel

Remember racing was dangerous, and sex was safe

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03-07-2006 11:52 AM  11 years agoPost 25
Ruddy

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UK

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I use a small 1/4" drive airgun on a low setting, Just hold the fan in a cloth and do up Never stripped a thread or damaged a piston, And you dont have to remove any engine parts i.e carb or backplate. I wouldn't dream of using one of those piston lockers

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HelicopterMain Discussion › piston locker tool....
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