13-11-13, 06:14 PM
[quote author=Motorbreath link=topic=10674.msg113025#msg113025 date=1384354735
Those old FZR/YZF 1000 engines drink oil due to huge tolerances between engine parts, so everybody uses mineral for them. The text I mentioned was written by an argentine Yamaha mechanic and he said that even the R1 engines from a few years ago had very "old time" tolerances between parts. But it is the internet, maybe it was all bulls*it.
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This is rubbish. On what basis do you presume that mineral oil can fill in the 'huge tolerances' on older engines -and infer that synthetic oils cannot? Engines do not 'drink oil' due to large tolerances anyway -it's usually wear, not the standard tolerance being bigger.
These 'huge tolerances' are imaginary anyway, if you check the tolerances on the mains, big/small ends and cam bearings on a YZF1000 you will find they are comparable with the tolerances on modern engines.
Fortunately for your brainless mechanic, modern 'mineral oils' are mostly well up to spec for our engines and for most people are perfectly good enough. Obviously if you spend time on track days or like to use all your machines performance a higher spec semi-synth would be better.
All oils are mineral by the way, synthetic oils are simply chemically engineered mineral oils altered to perform better and more consistantly.
Those old FZR/YZF 1000 engines drink oil due to huge tolerances between engine parts, so everybody uses mineral for them. The text I mentioned was written by an argentine Yamaha mechanic and he said that even the R1 engines from a few years ago had very "old time" tolerances between parts. But it is the internet, maybe it was all bulls*it.
'
This is rubbish. On what basis do you presume that mineral oil can fill in the 'huge tolerances' on older engines -and infer that synthetic oils cannot? Engines do not 'drink oil' due to large tolerances anyway -it's usually wear, not the standard tolerance being bigger.
These 'huge tolerances' are imaginary anyway, if you check the tolerances on the mains, big/small ends and cam bearings on a YZF1000 you will find they are comparable with the tolerances on modern engines.
Fortunately for your brainless mechanic, modern 'mineral oils' are mostly well up to spec for our engines and for most people are perfectly good enough. Obviously if you spend time on track days or like to use all your machines performance a higher spec semi-synth would be better.
All oils are mineral by the way, synthetic oils are simply chemically engineered mineral oils altered to perform better and more consistantly.