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Post by JonW on Dec 22, 2019 1:19:56 GMT 1
I pulled down a set of LC forks a while back that had progressive springs, Goki aircaps and this brazing...  I sort of know what to expect from the aircaps and the springs, but wonder if anyone knows what the effect will be of blanking one of the holes on the damper? I believe that halving the flow would slow it down significantly, do we think this might be a good thing? |
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Post by Shytalk on Dec 22, 2019 10:45:01 GMT 1
Yes, it’s reducing the oil flow, return so in theory firms up the suspension, no idea whether it’s beneficial or not, but it is a common thing from what I’ve seen about “upgrading “ the front suspension.
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Post by Deleted on Dec 22, 2019 10:48:18 GMT 1
I posted this in your rebuild thread, Jon
Just working through the logic here of fluid movement, I don’t know if I’m correct or not, however here goes, any Ohlins technicians here?
Less holes I think would be less flow of oil therefore more resistance to the movement of the damper, so the fork would feel harder to compress quickly, the opposite effect I would think that it would also return more slowly to its original position, if I’m correct that means the damping effect would be increased
By harder I don’t mean the suspension is harder I just mean that the action is slowed down making you think the fork has a heavier spring in it
It could also give you more heat affecting the viscosity of the oil which may negate the effect of less holes as the oil may become thinner as it heats up and thus flows faster under pressure
Most modern oils I think would cope with this heating though
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Post by ringding on Dec 22, 2019 11:51:35 GMT 1
When I raced my LC it was a common mod to allow you to use a lighter oil to achieve a similar damping level. The reason being that thicker oils would tend to 'froth' up and give inconsistent damping when used on the track. With the amount of patter that LC suspension gives on the track with race tyres every little helps!
My damper rods were completely braised up and then two new (much smaller) holes were drilled.
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Post by jon on Dec 25, 2019 9:22:13 GMT 1
Out of interest, why braze them and not weld them?
Jon
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Post by Deleted on Dec 25, 2019 12:33:13 GMT 1
Lower temperature than welding I’d guess
Less chance of deformation and weld splatter perhaps
Easier to do as well I suppose
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Post by JonW on Dec 25, 2019 14:32:59 GMT 1
Dunno, but suspension always seems to be brazed. Howard may well be right.
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Post by 4l04ever on Dec 25, 2019 18:50:06 GMT 1
Some of the fork "emulators" require the holes to be filled in in the damper rods...
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Post by JonW on Dec 26, 2019 0:56:11 GMT 1
Yes they usually get you to fill in most of them up top and then drill a couple huge ones lower down to render the OEM damping inoperable.
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Post by bare on Dec 26, 2019 20:30:52 GMT 1
NO brazing up of Holes with YSS em valves.
Only old Racetech ones had that in their fitment instructions.
Easiest simplest way to firm up our forks is to Use Mobil 1 ATF ..
It's true.. Try It?
It's 'undoable' as well :-)
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Post by mak595 on Dec 27, 2019 13:40:19 GMT 1
When i put a pair of YSS emulators in a Vmax, the instructions said drill out the holes to 8mm so the oil flows freely, letting the emulators do their job
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Post by jackjabba on Dec 27, 2019 14:01:57 GMT 1
MikesXS emulators ask you to drill extra holes as well.
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Post by bare on Dec 27, 2019 18:39:56 GMT 1
They are the Same part :-)
yess they do ask for bigger holes... but there is NO brazing up of the existing ones.
Which was the question.
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Post by donkeychomp on Dec 27, 2019 23:47:12 GMT 1
Why aren't the holes drilled out larger in the factory before hand?
Alex
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Post by JonW on Dec 28, 2019 0:36:19 GMT 1
No the original question was not about emulators at all.
My question was about the fact that half the holes (ie 1 of the two) had been brazed up and how this would effect the working of the fork.
Someone else started talking about emulators, not me. I have those in other forks and am aware of how they work and how to fit them. These dampers came out of a set of forks that did not have emulators, just different springs and Goki aircaps.
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