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Cruizin
20 hours ago, faffi said:

I've changed the topic, although the title didn't positively state the damage was caused by the oil, only that it took place with Mobil 1 in the engine.

 

The owner thinks the risk is too great to try the oil again. Note that it was oil for cars that potentially could lack the film strength to withstand a 13000 rpm motorcycle engine with plenty of cam lift. If so, the type of oil rather than the brand would then likely be the culprit - I brought it up merely because Mobil 1 is typically recognized as the best there is, yet here was an engine that for one reason or the other failed while using Mobil 1. So I found it intriguing. You can also find tons of reports of spun main bearings on Subarus using Mobil 1, but again it is more likely a result of a combination of too thin oil and a poor design rather than the brand of oil. Still heavily debated, though.

 

The owner of the 10R is not reluctant to use Mobil products - in fact, he has often mentioned them as maker of good oils - but that he will only run motorcycle specific oils in his motorcycle engines.

Thanks for changin that @faffi  I could have done it myself but I prefer not to be a Nazi. 

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norcal616

please correct me if im wrong...

 

I know cams dont always have same "lift", "duration", "shape", etc on both exhaust and intake... Is the ZX-10R a dual grind can with diffrent "lift" heights between intake/exhaust? if so I can see 1mm being possible if that owner measured an intake cam and an exhaust cam... 

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markstertt

It would appear he is measuring lobes on the same shaft so doubt an issue but, yes, intakes and exhausts can be either symmetrical or asymmetrical. If this owner doesn't know the difference between which lobes or specs he's measuring, then anything's possible but I'm assuming he does.

 

The most critical time in the life of a cam is the initial run in...the first minutes of your engines first start and why cam lube is so important on a rebuild with a new cam and lifters. In an ideal world you would first start your engine with  lower valve spring pressures to help break in your cam/lifters, then set the pressures up for high rpm running later in life.

 

I'm not convinced that the early dyno runs, if done correctly, were harmful, if what I've been led to believe is true and that is that the factory runs all our engines up to full power before shipping....any one know if this is indeed a fact? 

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rick
42 minutes ago, markstertt said:

 

I'm not convinced that the early dyno runs, if done correctly, were harmful, if what I've been led to believe is true and that is that the factory runs all our engines up to full power before shipping....any one know if this is indeed a fact? 

According to Revzilla, Motus does

 

Screen shot 2018-05-16 at 1.55.14 PM.png

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faffi

Even as far back as 1969, BMW would take their freshly built R75/5 directly off the assembly line and run them - cold - on a dyno, revving them right up through the gears. Considering the much better oils and much better metallurgy as well as immensely better production quality, doing so with a modern engine is no sweat and in fact is done to every mass produced engine. 

 

BTW, that was how Yamaha discovered water leaks on their XZ550 Visions, by just strapping them on the dyno, revving the crap out of them to get the temps up quickly and watch for steam.

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r1limited
46 minutes ago, faffi said:

BTW, that was how Yamaha discovered water leaks on their XZ550 Visions, by just strapping them on the dyno, revving the crap out of them to get the temps up quickly and watch for steam.

I saw that movie, that was awesome when godsirra squashed them dynos to death

  • Haha 1

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guylee

I too like to run sand through my motor sometimes. 

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Beemer
On 5/16/2018 at 4:33 PM, r1limited said:

I saw that movie, that was awesome when godsirra squashed them dynos to death

Godsirra made kaijuice (see what I did there?!) out of Rodan and Mothra, he so bad-ass!

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