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Open primary chains
#661245 07/19/16 12:39 pm
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We all know open primary chains don't last very long. But what about the Triumph GP bikes ? They are always shown with an open primary..I can't believe dripping oil on the chain would make it last 100 miles of racing ???

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Re: Open primary chains
Hillbilly bike #661258 07/19/16 3:00 pm
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It's turning nearly twice as fast as the final drive chain, maybe keeping it oiled in the same way will work for a race or two.

I know several people who run their (albeit covered) primaries with just a spray of chain lube. However they are not turning the motor as fast as the ones being discussed


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Re: Open primary chains
Hillbilly bike #661259 07/19/16 3:01 pm
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I can believe it, because it did.

Same on many of its contemporaries.

Do you doubt that a Manx Norton could finish an Isle of Man TT?


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Re: Open primary chains
triton thrasher #661261 07/19/16 3:10 pm
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I know they raced and won with open primaries....I also know primary chains not running in an oil bath get smoking hot in several miles of straight line land speed racing...


79 T140D, 96 900M Ducati 81 Ducati Pantah 500 ..On a bike you can out run the demons..
Re: Open primary chains
Hillbilly bike #661265 07/19/16 3:30 pm
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those riders also wore well-oiled boots and rested their feet on rear-set pegs,
so no danger of getting a pants leg caught in the chain.

This is why CHAIN GUARDS were invented.

Re: Open primary chains
Hillbilly bike #661304 07/19/16 10:05 pm
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...I see 2 oil lines to the chain. Mine is an old one like those gp bikes but a normal 500 without a primary oil special lines but only the engine breather spit oil when you crank the engine; no doubt.
So I do not see any problem.

Re: Open primary chains
reverb #661330 07/20/16 6:15 am
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Perhaps...at racing speeds the primary chain is traveling at about 6000 feet per minute...I would think all oil dripped or sprayed on at speed will be flung off before it gets a chance to lubricate anything...
I do know on a slower reving Harley primary,428 double row chain,same pitch as the Triumph single row chain,an open primary chain will be trashed in less than 100 miles at highway speed...
But they did race with the open primaries, very interesting


79 T140D, 96 900M Ducati 81 Ducati Pantah 500 ..On a bike you can out run the demons..
Re: Open primary chains
Hillbilly bike #661335 07/20/16 8:00 am
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Kevin Cameron discussed that subject.....somewhere.

Re: Open primary chains
Hillbilly bike #661368 07/20/16 12:53 pm
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Speedway bikes run 'open primaries' with only a outer protective cover. When in the pits with son Joel he showed me how hot the chain runs by spraying it with chain lube that instantly vaporized. The drill is to allow the chain to cool off before lubing. But then the SW engines run 10k+ revs with small engine sprockets.

I've noticed DID makes a 'X Ring' lubed 428 chain. I wonder how this would survive in a primary. hmmm. I've used DID 428 racing chain in the primary of my GSs for years before I went to belt drives. Good stuff. You need to buy longer lengths made for the 80cc MXr bikes.

Last edited by dave - NV; 07/20/16 1:01 pm.

Dave - NV
Re: Open primary chains
Dave - NV #661373 07/20/16 1:40 pm
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Originally Posted by dave - NV


I've noticed DID makes a 'X Ring' lubed 428 chain. I wonder how this would survive in a primary. hmmm. I've used DID 428 racing chain in the primary of my GSs for years before I went to belt drives. Good stuff. You need to buy longer lengths made for the 80cc MXr bikes.


Dave did your primary chain have a master link?


79 T140D, 96 900M Ducati 81 Ducati Pantah 500 ..On a bike you can out run the demons..
Re: Open primary chains
Hillbilly bike #661379 07/20/16 2:21 pm
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Hillbilly ... Yes the DID chains use a conventional 'clip type' master link with a press on side plate. No problems.


Dave - NV
Re: Open primary chains
Hillbilly bike #661602 07/23/16 2:58 am
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..here's a picture of the DID 428 vx on a pre unit triumph & a unit 650 which can be run 'dry'...
on the bottom phot you can see the much 'meatier'difference in the size of the chain.
[Linked Image]

[Linked Image]

[Linked Image]


...I do not and cannot accept the principal that incompetence justifies dismissal...
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Re: Open primary chains
6T #661706 07/24/16 7:34 pm
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Wasn't it common 'back in the day' to heat a tin of grease on the stove top and soak the chain in that?

I believe that oil inside a 'chain case' is vaporized by turbulence much like the inside of a crankcase has a cloud of oil vapor in it. I doubt the primary chain is sitting in oil once the engine is running.

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Re: Open primary chains
Hillbilly bike #661727 07/25/16 9:04 am
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Having seen oil leak from the top of the primary chaincase of a Matchless single, the oil does get thrown around as the bike is used (cornering, bumps, wheelies etc).

Re: Open primary chains
dodgeboy57 #661784 07/25/16 4:58 pm
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Originally Posted by dodgeboy57
Wasn't it common 'back in the day' to heat a tin of grease on the stove top and soak the chain in that?


Ah yes... the good old days! Every biker's workshop would have a grease tin and a small stove...

Re: Open primary chains
Hillbilly bike #661950 07/27/16 7:14 am
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...my mate(who's passed away now)...was carrying the can of hot chain grease through the living room when he tripped..................There was an atmosphere for quite a while...and not just that smell of grease!!!


...I do not and cannot accept the principal that incompetence justifies dismissal...
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Re: Open primary chains
6T #662351 07/31/16 12:08 am
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Blast from the past.

http://classicbike.biz/Triumph/Repair/45-55/45-55TriumphRepair.pdf

Page 95 has instructions for rear chain lubrication.

The problem with letting it cool, and then wiping off the excess is that it is hard to get the stuff between the links out.
So I take the chain out after it is cool, scrap off what I can, then hold the chain over the can and take a propane torch and quickly heating the outside layer of grease, letting the grease drip back in the can. If done correctly, the outside grease is melted and drained off, and the inside of the chain rollers do not get hot enough to lose the grease inside them.
'Course, with Xring chains, that is all moot. clap

CZ


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