fig SUPERBLEND BEARINGS

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URALNUT60
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fig SUPERBLEND BEARINGS

Post by URALNUT60 » Thu Jun 18, 2020 7:00 pm

Read a older article on 650 crank failures, the article when on to state that this person installed a fig superblend bearing in the rear bearing carrier, no mention of installing one in the front were it is captured, i am guessing there was a bearing alignment problém causing crank failure, superblends are self aligning not to mention the superblend would let the crank flex as in the case of the norton command which solved there crank problem, would anybody like to elaborate on 1 superblend bearing and not 2? Thanks

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Re: fig SUPERBLEND BEARINGS

Post by Snakeoil » Thu Jun 18, 2020 7:18 pm

Can't comment on Superblends applied to 650 engines. My crank was bent and I maintain it was bent during assembly in the factory because of how it was bent. I replaced all the bearings in the engine with Nichi Japanese bearings and replaced the crank, two jugs and put Herzog timing gears in place of Ivan's gears. The engine is electric motor smooth.

I would not doubt that the 650 crank may flex in operation. I think pretty much every bike crank flexes to some extent. But I'm not sure the superblends will gain you anything over quality, replacement in kind type bearings. And even if they did provide some benefit, I'm not sure how one would measure it.
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Re: fig SUPERBLEND BEARINGS

Post by rougaroo » Fri Jun 19, 2020 7:52 am

Agree with Snakeoil. I think bearing failure is more often a result of crank failure than the origin of it. So going after bearing solutions is treating a symptom, not a cause.

The multi-part crank inherently flexes. Good bearings help with longevity, no doubt there, but putting any stress on the crank during installation probably contributes more to failure. Of course, no oil, dirty oil, etc are more often the primary causes.

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Re: fig SUPERBLEND BEARINGS

Post by BillyG » Fri Jun 19, 2020 8:22 am

“F A G” Superblend bearing...not fig. Just so folks don’t get confused.

https://www.rgmnorton.co.uk/buy/superbl ... on_341.htm
Last edited by BillyG on Sat Jun 20, 2020 7:02 am, edited 1 time in total.
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Re: fig SUPERBLEND BEARINGS

Post by jaybird » Fri Jun 19, 2020 5:00 pm

Now this is starting to get humorous :lol:

I've had trouble with the Russian bearings used in the 650 and early 750 engines, to the point I'm reluctant to put any miles on an engine still equipped with them. I would have more confidence in almost any other bearing. But that,s just my opinion.

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Re: fig SUPERBLEND BEARINGS

Post by URALNUT60 » Fri Jun 19, 2020 8:08 pm

When i proof read fig showed up then when submitted fig came up, edited it samething came up! Lol

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Re: fig SUPERBLEND BEARINGS

Post by URALNUT60 » Fri Jun 19, 2020 8:24 pm

Recently lost a crank 650, pulled through captured bearing, supported back end of crank with jig in gobi video while installing rear bearing cover, once installed crank spun freely, once bike run around neighborhood a couple times pulled rocker covers, plenty of oil which would indicate plenty of oil splashing around to lubricate crank, purged big end rod bearings and oil passages before installation, was curious about what ural has for crank end play? Motor spins freely upon fastening rear bearing carrier but how much play is there when crank heats up and expands?

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Re: fig SUPERBLEND BEARINGS

Post by jaybird » Fri Jun 19, 2020 8:51 pm

URALNUT60 wrote:
Fri Jun 19, 2020 8:08 pm
When i proof read fig showed up then when submitted fig came up, edited it samething came up! Lol
For a humorous explanation of why you can’t say F A G on here, read this through;
viewtopic.php?f=3&t=55412&hilit=Fig

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Re: fig SUPERBLEND BEARINGS

Post by URALNUT60 » Fri Jun 19, 2020 9:11 pm

Technology is great when it works right!

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Re: fig SUPERBLEND BEARINGS

Post by n3303j » Thu Jun 25, 2020 9:29 pm

BMW R60/2 used standard ball bearings on both ends of the crank (30HP). The R69S used a "superblend" bearing at the rear of the multipiece crank (40HP). Supposedly the R69S with its greater horsepower and RPM created more flex in the multipiece R69S crank and the spherical roller bearing allowed this flexing without harm to the bearing. In practice it seems a standard C3 clearace worked well in the R69S engine and was certainly less expensive.
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