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HomeAircraftHelicopterGasser Model RC HelicoptersOther › Please help, pics of piston
04-25-2011 02:37 AM  7 years agoPost 1
flyinfriend

rrApprentice

North American continent

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Hi,

I was taking my stock g231 out of my Spectra tonight to double check the runout of my fan. When I looked into the exhaust port I could see varnish on the piston below the ring. I removed the head and below is what the piston looks like. My guess is the ring stuck on the exhaust side because of so much carbon build-up. The carb side did not have the blow by below the ring and the ring springs out on that side. This engine is 3 months old running a couple of tanks most weekends. The piston is not scored. Would I just need to replace the ring? How would I remove the carbon build up on the piston and inside the head (is that even necessary?)?

Thank you for any help,

Tom

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04-25-2011 02:51 AM  7 years agoPost 2
dre4473

rrApprentice

Clarksburg WVa

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piston
Order a new piston and ring..Around 20.00 for it all at daves rc..then watch your temp on the engine..

Donald R. Edwards JR Fly it like you stole it!!!

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04-25-2011 02:55 AM  7 years agoPost 3
Helizrule

rrVeteran

Lake Ariel, PA

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What oil are you running?

One mile of road will take you one mile. One mile of runway will take you anywhere in the world.

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04-25-2011 03:36 AM  7 years agoPost 4
rbort

rrProfessor

Franklin, MA - USA

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Overheated
Looks like too hot baked. What oil are you using and how much? This is just for my reference.

-=>Raja.

MA 1005 Hanson 280, 4220 flts
Spectra 27 3DMax, 3310 flts
Whiplash V1-2 Hanson 300, 1618 flts
Whiplash V2 Hanson 300, 473 flts

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04-25-2011 03:41 AM  7 years agoPost 5
dre4473

rrApprentice

Clarksburg WVa

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piston
In the middle pic I see some slight scoring too on the dove tail..Well above the 260-270 degree mark on temp..

Donald R. Edwards JR Fly it like you stole it!!!

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04-25-2011 04:02 AM  7 years agoPost 6
turboomni

rrProfessor

East of the Equator

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I would love to know the the needle settings too

Setup is everything, All my heli's can fly far better than I can pilot them

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04-25-2011 04:29 AM  7 years agoPost 7
GREYEAGLE

rrElite Veteran

Flat Land's

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My Question ?
Why did you break it down ??? Just for the look ?

It may have had the chance of being cleaned while in the jug. Head might take of it self with a bit of time.

Ring gap may be normal - but need the spec's on the ring gap distance or space to confirm with a OEM Spec.

Not as bad as it looks.

I say mineral based ash less and a whole lot of it !

Now if when you clean it what ever do not let that stuff into the needle bearings of the rod or the crank bearing's.

greyeagle

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04-25-2011 05:07 PM  7 years agoPost 8
flyinfriend

rrApprentice

North American continent

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Hi,

Thanks for the replies everyone. I took the head off because I could see the blow by varnish below the ring through the exhaust port. I am using an oil called Pro Mix from Lowes which is a natural/synthetic blend. My needles are approx 1 1/2 on the high and 1 3/8 on the low. The mix ratio was 32:1 and then when I was getting the high rpms I increased the oil by about a 3/4 of an ounce to about a gallon.

The engine has been running fine ever since I switched over to the stock muffler and packed away the latest version of the long Century muffler. The Century muffler was causing or seemed to be the cause of the engine going into a hover and the suddenly going into screaming high revs and hanging at the high revs. I would throttle down and it would come right down to an idle. This happened over the course of three weekends. I never flew it with the screaming high rpms for any length of time, I just hovered and when it locked onto the high rpm I would land it.

When I was getting the high rpm I opened the high end needle to around 1 3/4 to see if I could get the rpm to come down but that seemed to have little effect. I'm guessing this may have been when I stuck the ring and got the blow by past the ring.

Does it appear to be too much oil and too high temps?

Thanks for your help,

Tom

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04-25-2011 10:21 PM  7 years agoPost 9
dre4473

rrApprentice

Clarksburg WVa

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piston
Oil type is not good enough for these engines..Use a better grade of oilfor this app..The piston is toasted and I personaly would not risk it in my gassers..You can get the piston and ring with new gasket of your choice fro around 20-25 bucks so its worth the re-do..Your oil wasnt burning right and there was way too high of temps on the engine for the 231 to handle..Stay in the range of 230-260 max!!! If you can get a temp gun of some type to test and detect the hot spots..Make sure the cyl isnt scored too..There is some evidence of rubbing on the dove tail of your piston from the ring seizing up..Hope this helps ya!!

Donald R. Edwards JR Fly it like you stole it!!!

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04-26-2011 01:05 AM  7 years agoPost 10
flyinfriend

rrApprentice

North American continent

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Hi Donald,

I would just replace the piston but I would still be concerned about the high frequency vibes that turned my grey links to powder and loosened them. I decided to send it to Al at Hanson. He is going to replace the piston, true the crank, balance the rotor, and balance and mount the fan.

I am switching to the Pennzoil 100% synthetic marine oil that Al, Chris Bergen, and Raja recommend. Al said to not even break in with the lawn-boy ashless but go straight to the marine oil.

So that's my plan. I'm really confused as to what or when I burned all the oil on the piston as I never ran the needles lean. The screaming rpm only happened when I was hovering, before I switched from the new Century muffler to the stock muffler.

Hopefully all will be well when I get the engine back from Al.

Thanks,

Tom

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04-26-2011 01:33 AM  7 years agoPost 11
dre4473

rrApprentice

Clarksburg WVa

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piston..
Good deal man..Al is good and your engine will run better than ever..Let us know how it goes for ya!

Donald R. Edwards JR Fly it like you stole it!!!

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