rhtrudder
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Everything posted by rhtrudder
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Ended up removing the head, the seat had a small scourered section in line with the exhaust valve, mate ownes the local Honda dealership and one of his old school mechanics soon tidied it up , valve was okay, changed all the radiator hoses at he same time while I could get to the water pump, compressions now good , back flying , engine seems a bit smoother .
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I was hoping my engine was going to last like yours , my maintenance program was similar to yours but I will be happy if this is the only trouble I have
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Leak down test showed 65 lost from 80 psi , pulled the cross over pipe off definitely loosing air , so leaky inlet valve, rang wally who thought that would be the problem, should be a easy fix if comes apart.
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Raced 2 stroke motocross bikes in enduros back in the early days , had some sort of chrome bores , only ever changed the ring and sometimes the piston, good air cleaner, the cylinder seemed to last okay
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Thanks for the help , got to fly a mate to Griffith tomorrow so I will do the test on the hot engine and let you know,
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Engine fitted to a sabre , I'm the third owner , had 400 hrs up when I bought it, never had any issues with it, read somewhere the compression needs to be above 85 before a rebuild, if flying with one soft cylinder can that have any detrimental effect to the engine
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How many hours have you got on your engine?
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I will give that a go
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First I wound the hot engine over on the starter to check what the compression looked like between the cylinders 3 at 125 last one at 110 Leak own test had more air coming through the tank than the other 3 , might not be a big deal to just change the rings, but only guessing
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Still haven't given up on rebuilding my engine , heard they can last up to 3000hrs but am I bit disappointed on the compression loss
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It's hard to see why it costs 10k to fit a turbo , doesn't look like it's that difficult
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Engine has 1400 hrs on it , compression down consistently on one cylinder over the last 200 hrs , guessing it's going past the rings , doesn't seem to be using any oil so I will keep flying it , just looking at all he options, I believe the 80 is a lot cheaper than the 115 and maybe keep the original for spares
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WE have turbo chargers on most of the engines on the farm with high hours , never given any trouble , but unsure of the life on the rotax
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Starting to wind a few hours up on my 914, looking at engine rebuild or replace , terrified of the cost, would it be possible to convert the 80hp 912 to a 914 by swapping all the 914 bits over , carbys airbox exhaust and turbo , worth a thought
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I put a lot of faith in my gauges, after start up which is when I picked up the initial problem, and climb out ,not all,but most of these problems seem to occur when the engine is running.
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you are right , my radiator set up holds about 2.5 litres which would have to empty out through the lid, and I guess some could be left behind when the engine cooled down.
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You would think if the cold level in the overflow bottle dropped away there would be a problem
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I think it might be a smart idea to get the original cap from floods, the oil cap screws on with the right thread , has no tube to direct coolant away so would end up on the battery.
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My problem wasn't that the radiator was low on fluid , the overflow tank had the wrong cap which came under pressure and blew the tube , I have changed the fluid at the service intervals but never had to top it up, my point was that a simple small hole in a the cap was all that was needed, I never picked up that it had the wrong cap. Flew it tonight with no overheating so all good, discovered that with a torch and mirror I can check fluid level through the oil inspection hatch, thanks everyone for your interest.
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Indeed, thanks for pointing out the bleeding obvious
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Lots of screws to get to the cap, easy to see the bottle, never had any trouble with the cooling system before, maybe the oil cap leaked enough air to still breath , have drilled the 3mm hole which could have caused a disaster , my CFI said it's the simple things that will kill you , lucky this time.
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Looks like previous owner lost original cap and replaced it with a Castrol oil bottle lid, I did think it had to be vented otherwise everything would be under pressure , engine done 1400 hrs, lucky to get this far, hope there's no more damage
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Should the overflow tank on my 914 be vented , mine is sealed , wondering if that would put undue pressure on the plastic line from the cap to the plastic tank as mine blew a hole in it,
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Seems hardly worth the trouble
