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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › Hyper 50 with "pitting"
07-21-2006 03:29 PM  14 years ago
TMoore

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Cookeville, TN

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This is what you would call a lean run. Several of them.

But then again, I'm sure that afterrun oil would have magically healed the piston and head because the car guys say it's so.

TM
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07-21-2006 03:36 PM  14 years ago
AzHyper

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Peoria, Az.

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Terry - you know that's not true. We all know that car fuel has SHA added to it just for this reason. (Special Healing Additive)
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07-21-2006 03:54 PM  14 years ago
TMoore

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Cookeville, TN

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Cog,

You're just saying that cause it's true.

TM
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07-21-2006 05:18 PM  14 years ago
tbcseod

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Denver, Co USA

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OBTW take a look at the plug in that head now
I knew someone would catch that - yes, thats a old junker plug I had threaded in to keep from pushing "gook" into the treads while I tried to clean the head up some for the photo (so that the little pits/dimples/divits ect were more visable). I have the kind of luck that I would ge somthing in the last thread of the hole - insert plug - strip hole - blow plug out of stripped hole at 200 feet - have bird crash on top of my truck.................

As far as I can recall I havent ever blown out a plug - that I recall. I have had a couple go bad - maybe a piece of one of there filaments broke off and did that damage
OK, so it won't fly any better but it looks damn good on my shelf. Bling-Bling!
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07-21-2006 05:21 PM  14 years ago
tbcseod

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Denver, Co USA

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Special Healing Additive
HAHAHHAAAAA!

Hi ya Cog Hope things are treating you well mate, them blades are still together - no new boom strikes

~Terry
OK, so it won't fly any better but it looks damn good on my shelf. Bling-Bling!
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07-21-2006 05:35 PM  14 years ago
AzHyper

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Peoria, Az.

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Hey Terry - glad you've still got those blades. Well, it's only going to be 115 today so you'd better get out there and practice! I use Magnum 30% and on all 3 of my hypers the main needle is out between 1.25 - 1.5 turns. I also use OS#8's. The backplate is always hot to the touch in this weather so you can't use that as a guide. When you get it back together, start at 1.5 out and go in from there.
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07-21-2006 05:59 PM  14 years ago
tbcseod

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Denver, Co USA

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Will do - I was just coming back online to check what the "factory settings" were on the Carb - looks like i had it about 1.15ish turned out. bumped it up to 1.65ish and going to try and burn a tank in before I have to go to a lunch-in today..........

Cheers,
Terry
OK, so it won't fly any better but it looks damn good on my shelf. Bling-Bling!
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07-22-2006 02:02 AM  14 years ago
hellflyer

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Staten Island NY

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dont rule out dirt if no air cleaner it will let the dirt inThe first step in gettin help is admitting you have a problem ( yes I am addicted to helicopters )
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08-03-2006 04:44 PM  14 years ago
supertigre

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Castle Rock, Colorado

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IMHO, the Hyper is over-compressed for 30% fuel and it is mostly luck that more people aren't seeing this kind of erosion of the piston and head. In this case, it may just be coincidence that the erosion is occurring at the lower side of the piston. It can occur at just about any point on the piston.

I am with TMoore in that there is nothing in the fuel or residue that will cause etching of aluminum parts. I also have engines that sat for years with no special prep and there was no evidence of pitting.

If you are one of the lucky people that have a rust problem, then use of after-run oil MAY help with that. I say MAY because there are some that get rust no matter what they do.
Paul Mcintosh
Owner-CRCustom.com - custom vinyl lettering, banners, signs
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08-03-2006 04:58 PM  14 years ago
shuttlepilot

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Mullins, South Carolina

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I have to agree with TMoore on this also. Looks like lean running to me. On the car note....most, if not all car fuel has about 12% oil, maybe less. Most heli fuel has 18 to 22%. I think that maybe that's why the car guys use after run oil. I have only seen this kind of pitting when I used to motocross race. It came from running the engine too lean, or without enough oil in the mix. Usually the "pitting" was actually the piston breaking down and disintegrating.Gas is Great
Camper Fuel is Better!!
QWW Helis
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08-04-2006 11:57 AM  14 years ago
Jafa

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Sydney, Australia

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Sure looks like a lean run to me

Do you run that air filter on the carb in the heli?
(maybe it's just there while engine is out?)
That could be the cause of you running lean
as the restriction they impose is pretty bad
and not linear, so if you tune in normal mode
you could well be lean in idle up

Water in the combustion chamber can also cause pitting,
only ever seen this in cars where the cylinder head gasket
has leaked however
Just wondering if your methanol has soaked up moisture
(I don't even know if it would result in this anyway)

Protos | Logo 400 & 500 | Sceadu Evo | Freya Evo | Trex600N | Avant FX
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08-04-2006 07:51 PM  14 years ago
tbcseod

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Denver, Co USA

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Filter
I have ran with the filter inplace - 2 of the 3 places I can fly around my house has quite a bit of dead grass that kicks up when spooling up and landing. Guess I might be looking at taking that off as I'm not so sure it is really helping - just seemed like it would when I put it on

~Fly Safe
OK, so it won't fly any better but it looks damn good on my shelf. Bling-Bling!
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08-04-2006 08:17 PM  14 years ago
shuttlepilot

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Mullins, South Carolina

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I have always used a filter on my heli engines. I don't think that is at the heart of the problem.Gas is Great
Camper Fuel is Better!!
QWW Helis
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08-05-2006 02:01 AM  14 years ago
Jafa

rrElite Veteran

Sydney, Australia

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I've flown at some pretty dry and dusty fields,
but I've never had a problem with crap getting into the carb
The fan blowing air down over the carb seems to save it
and only very thin stuff can get in and through the fan

It's very rare to use a filter on a heli
I would never dream of doing it

Certainly it's not the heart of the problem,
the main issue is that the engine was run lean

Protos | Logo 400 & 500 | Sceadu Evo | Freya Evo | Trex600N | Avant FX
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08-05-2006 03:35 AM  14 years ago
shuttlepilot

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Mullins, South Carolina

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It's very rare to use a filter on a heli
I would never dream of doing it
Not trying to get off topic but I have to respectfully disagree with that statement. I think that anything that has to ingest air for combustion needs to have a filter. I see what I clean off of the fan and shroud when I have my engine out to clean, and to think that none of that goes into the engine would have to be pretty much illogical at best. I know lots of guys run witout filters, but you indicated above that running a filter could have something to do with running lean. If it's not drawing as much air due to a filter, then certainly having to lean the mixture to match the airflow would only make you lose power not run hot. I run an OS .46 with a filter on no more than 5% nitro with 16% oil. I use a hatore pipe to get the power out of it, but running it without a filter does not make it run cooler. I would think this setup would show the difference easily because lower nitro seems to have traditionally hotter temps. I've tried it both ways didn't see a difference to cooling.

I had an Enya run in a shuttle zx for 7 years with a filter. I don't think it would have went that long without one.

Sorry so long, it's just one of my pet peeves. There will be many other opinions....I'm sure of that.
Gas is Great
Camper Fuel is Better!!
QWW Helis
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08-05-2006 04:21 AM  14 years ago
Jafa

rrElite Veteran

Sydney, Australia

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Your opinion (pet peeve) is very much a minority view,
it is exceptionally rare to use an air filter on a heli
But as long as it works for you and you're happy, that's fine

http://www.runryder.com/t275491p1/?highlight=air+filter

I agree that the filter would not make it run lean,
that's a good point...

Protos | Logo 400 & 500 | Sceadu Evo | Freya Evo | Trex600N | Avant FX
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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › Hyper 50 with "pitting"
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