Ed Cregger
Posts: 7744
Joined: 1/31/2002
From: Ringgold,
GA, USA
Status: offline
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quote:
ORIGINAL: yallaair
The reason for not sending the engine back to sender or a workshop, is that the shipping costs will exceed or be quite close to the value of a new engine. It's sold by Peakmodel together with the edge 540. Had several problems with earlier SPE 26 engines from that vendor. Don't want to spend more money on shipment without any return on already payed S&H.
I'll just face the loss and try to repair it myself. I'm capable of repairing this myself. I'm doing this kind of repair regularly on big bore engines from 1000 HP to 14000HP  Just want some feedback from people who has done this before on small (30ccm) model engines.
Not quite sure if this valve is a chorme-Nimonic plated valve or just a high tension steel valve. This is of importance how to grind the exhaust valve. Maybe 400 grit is too coarse, should consider 800 grit??
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I'm just coming into this thread at this point, so please forgive me if my thoughts have been covered previously.
Are you using any castor oil in the fuel? The reason I ask is that the Chinese seem to put as much stock (faith) in castor oil as some of the old American engine makers and they seem to rely on castor varnish to help seal things up, so to speak.
I do not feel that your leaking exhaust valve is relevant to the situation. I do feel that a lack of break-in time and the possible absence of sufficient castor varnish in the engine is the real culprit. The engine is still not sufficiently broken-in, making it hyper sensitive to carb settings, fuel type, engine load (prop), etc. My Sanye engines (ASP, Magnum) steadily improve in their handling as they acquire running time. A gallon of fuel isn't much when one is breaking-in a 1.80.
I wouldn't panic just yet. I would continue to acquire running time before disassembling the engine. If you must use onboard glow for a while, so be it. It would not be unusual for an inverted engine installation anyway.
Forget making the engine idle reliable for longer than 30 seconds. That is an unreasonable goal for a glow equipped model airplane engine. These engines were not designed to idle like a lawn mower for minutes at a time, if this is a concern of yours. I've seen others post here express concern because their engine would not idle, or successfully recover, from a longer than 30 second idle. This is seldom used and is not required in typical model airplane usage.
Ed Cregger
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Artisan
"Flying models since the Fifties - I'll get the hang of this yet!!!"
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> RE: ASP 180 fs 
RE: ASP 180 fs - 
Maybe the leakage is reducing the compression at idle, and therefore it is impossible to get a steady running below 3000 RPM? Any suggestion how to grind this valve? Use a 400 grit grinding paste and grind the valve into the seat? 
