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Post by cresco750 on Jun 15, 2015 19:53:16 GMT -5
Hmm, may have something to do with why it konked out at the end of my driveway when I returned from my last ride, and has refused to start ever since?!  |
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Post by wayne on Jun 15, 2015 20:31:33 GMT -5
I hope I'm looking at the graph for the original engine here ??
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Post by cresco750 on Jun 15, 2015 20:40:59 GMT -5
Haha, yip.
So, this is the engine in my "good" RE that I bought as a non-runner which had suspected compression issues. I freed up the apex seals, got it running and managed to put about 1000km on before it finally gave up the ghost. Although I'm obviously disappointed that it no longer goes, I'm still pretty happy to have got the riding out of it that it i did.
Aside from the overall lack of compression, it would also appear to have one apex seal in particular that is letting pressure bypass?
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Post by wayne on Jun 15, 2015 20:59:06 GMT -5
I don't know enough to really comment on the trace. I have a bike which has a near identical oscillation in its compression albeit with a peak of about 115. It runs fine despite being a little outside the book allowance for individual chamber variation. The only thing you can feel is a little more overall vibration (which may or may not be due to the uneven trace) than my good bike with a very even trace.
A few mechanics on here who would know what they're looking at. Hopefully some educated opinions.
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Post by goandy on Jun 15, 2015 23:01:02 GMT -5
Two low and one high can be:
1. One apex seal chipped/stuck/excessively worn/weak spring;
2. Stuck corner seal
3. Two stuck/broken side seals (one per rotor face either side of the apex)
I'm afraid the only way you'll know for sure is to strip and inspect!
TBH most of the internal seals can be reused apart from apex seals. On my 77,000km motor the corner and side seals were almost at new spec. The apex seals were worn below the limit.
We can get new Hurley seals for our motors from the UK for around 250 quid/set of three on special order but I don't believe the springs are included. They offer replating and regrinding apex seal sets for the RO80 for 125 pounds but I don't think that would be suitable given we have cast iron seals. My springs all measured up fine- so were re-used. If your motor has overheated then the springs may be stuffed but that's unusual.
I'm probably going to have a crack at manufacturing some apex seals for my twin motor project- purely for the challenge. If it's easy I may make some sets available to the forum.
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Post by cresco750 on Jun 15, 2015 23:32:55 GMT -5
Hi Andy
Did you manage to get hold of Hurley? This is the engine I would like to rebuild with my set of Hurley seals. Now that I have finally got a loan of a compression tester (thanks Terry), and confirmed my suspicions I can safely pull this engine off......all the while restoring my other bike from scratch ;-).
I spoke to a local rotary engineering firm and they reckon they can probably re machine the side plates; does the moly coating permit machining if the plates or is it too thin?
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