November 7th, 2013, 07:20 AM | #121 |
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What I was getting at is the engine requires more revs for the same hp
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November 7th, 2013, 08:36 AM | #122 |
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I'm not convinced you are correct. That piston looked like it had experienced very high heat caused by oil starvation. I have heard of the oil light coming on during heavy breaking, but I think that the time spent doing a stoppie is relatively small compared to time doing a wheelie. Justin do you do stoppies for extended periods of time?
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November 7th, 2013, 01:17 PM | #123 |
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The oil pickup is in the rear of the engine so a wheelie would cause the pickup to be under more oil and not less.
Like I said, running on its side is the biggest threat - say after a failed wheelie. Justin was experiencing high engine temps from an unknown cause prior to his rebuild. The engine also had a rolled bearing. I don't know if it was the same cylinder or not. Ironically, the high engine temps forced a rebuild before he damaged his crank. He was definitely quite lucky in that respect. But because he uses full synthetic oil, I don't believe the problem was positional. I believe that something clogged up an oil passage and that was what did him in. I have seen other bikes where the oil filter is installed incorrectly which crams debris at high pressure into the bearings and crank passages. I don't know if this was a factor with Justin's bike or not. It could have happened prior to him getting it even if he did everything correctly. As far as I know, the piston and wrist pin are splash lubricated rather than pressure lubricated. The rods are solid and not hollow like some engines so there is no oil passing through them.
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November 7th, 2013, 04:16 PM | #124 |
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Could be foam related. The KZ-650/700/750 series would fail rod bearings if overfilled even slightly and run hard. I ran a windage tray and a sump baffle in my 810 turbo/nitrous drag bike successfully when others were killing cranks and rods.
Spinning a rod bearing in a stock motor is going to be a lube failure. There "should" be a spray notch in the rod to direct some oil towards the underside of the piston for cooling and lubrication. Although it is a possibility the cylinder overheated causing it to seize. That will also destroy rod bearings. I built a 740 motor with MTC 13.5 forged pistons once that would tighten up and spin a bearing. Turned out the piston clearance needed to be quite a bit more than was specified. The pistons were "old school" forgings with very little silicon. They really expanded a lot with a 50 horse shot. Once I figured that out and set it up loose, it ran like a raped ape for two full seasons, but eventually broke a skirt from being loose.
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November 7th, 2013, 07:12 PM | #125 | |
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Quote:
In both my engines the issues are in cylinder one. Is it a coincidence that it is last in line to be fed oil in the camshafts? What happens when you overfill anyways?
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November 7th, 2013, 08:01 PM | #126 |
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If the level is high enough the oil will become aerated (foamy/filled with air) and the engine will lose oil pressure.
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November 16th, 2013, 07:30 PM | #127 |
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November 17th, 2013, 03:18 PM | #128 |
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ahhh didnt know that
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