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Heliman

Tuskegee, Alabama

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This a YS .80. I have run Byron 20% and Morgan 30% heli....the head bolts were all not tight at all....I guess that explains why it never stayed dry and clean.

08-14-2016 05:37 AM
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cdrking

Elite Veteran

Seattle

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What could cause this?
the head bolts were all not tight at all
You answered your own question.

To hover is divine, the alternative is rather PLANE.

08-14-2016 06:29 AM
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helitom

Senior Heliman

Pine Grove, Calif, USA

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I have seen that from a bearing roller cage coming apart.

The older I get, the fewer things seem worth waiting in line for.

08-14-2016 07:10 AM
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bobbyhill4x4

Senior Heliman

Watertown NY

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This is truly caused by something coming apart in the engine. I will would start with the bearings.

08-14-2016 01:47 PM
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GREYEAGLE

Elite Veteran

Flat Land's

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Yup . and Extreme High time doing it : Effect of lean detonation ( Sucking air ) for a lean run. Then it propagates -
cdrking
What could cause this?
the head bolts were all not tight at all
You answered your own question.
Can you salvage it ? Yup - Lot of hand work may drop the compression a bit. But increase the volume

Aluminum melts at around 1250 - Dis-cast substantially lower -

{ Motor was no DOG Was it }

don't feel bad done worse on a Non Bearing motor " Bushed " and running 10% - But that was in the day we had a Nitro Shortage - It wasn't Nitro - Man it was Scary Funn' !

That 10% was nearly Rocket Fuel and stunk to High Heavens !
Bunch of Guy's in Fort Smith Arkansas figured it - Old Man's Name was " DUKE " Poured lil miniature BB's out of the thing

greyeagle

08-14-2016 02:51 PM
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artimus

Key Veteran

Buckley WA

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I have seen damage like this from a element from a glow plug breaking off and stay glowing and each time the piston comes up and fires it causes a detonation in betweew the head and piston, which causes the pitting......but that looks really severe.

Fly Hard......Team Viagra

08-17-2016 04:34 AM
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icanfly

Elite Veteran

ontario

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That's pretty good GE. He's saying the loose head gasket allows air to come in the chamber on the intake stroke around the edges where the pitting takes place and lean out the mix causing detonation.

Good call GE when no scratching on the sleeve and all other parts are present and accounted for in working order.

08-17-2016 01:04 PM
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revmix

Key Veteran

NJ

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lack of maintenance

08-18-2016 01:32 AM
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Flying Foot Doc

Senior Heliman

Plm Bch Grdns, Fl USA

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My $.02, probably a combination of a fragment of a glow plug and improper detonation. Looks like a new piston and head are in order, I would go over the rest of the engine at the same time. Good Luck with it, Andy

Inverted IS more fun!

08-18-2016 04:46 AM
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junkpilot

Veteran

Alamogordo N.M.

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My Two cents worth

I think it is a bearing ball or balls.The ball cage is probably entirely gone and this allows balls to escape from the bearing and gets shuttled up to the top of the piston. Let us know what you find.
Junkpilot

When you fly JUNK it's hard to tell when you've crashed!

09-16-2016 02:05 AM
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