Multigrade Fork Oil
- KungFooBob
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- Yorick
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Re: Multigrade Fork Oil
It's only scooters
I bought some decent 2 stroke a while ago in a rush and when I got home I saw it was for scooters. It's not going in the Husky
I bought some decent 2 stroke a while ago in a rush and when I got home I saw it was for scooters. It's not going in the Husky
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Re: Multigrade Fork Oil
I've just never seen fork oil with a multigrade rating, its usually 5w, 10w, 15w, etc... never 5w/30!
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Re: Multigrade Fork Oil
That's an interesting idea, damping that changes with the temperature of the oil
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Re: Multigrade Fork Oil
Surely the idea would be the other way around....damping which doesn't change with the temperature of the oil. Fork oil gets hot when it's doing it's job (all the energy that the damping takes out is converted to heat in the oil), so multi grade would make sense.
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Re: Multigrade Fork Oil
But isn't the non-W bit the viscosity at 100c?
I wonder how 'hot' the oil in forks gets?
I wonder how 'hot' the oil in forks gets?
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Re: Multigrade Fork Oil
They work OK as they are. I've never heard a racer complaining that suspension doesn't work at the end of a race.Le_Fromage_Grande wrote: ↑Tue Mar 23, 2021 1:30 pm That's an interesting idea, damping that changes with the temperature of the oil
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Re: Multigrade Fork Oil
Dunno about bikes tbh...probably not that hot cause there's a lot of oil! Off road would probably be worse just cause the suspension travels alot.KungFooBob wrote: ↑Tue Mar 23, 2021 1:52 pm But isn't the non-W bit the viscosity at 100c?
I wonder how 'hot' the oil in forks gets?
Certainly in F1 damper temperature is a thing they worry about.
Also on road cars when you do 'accelerated wear' testing on a super bumpy test track you have to drive through a 'damper cooling trough' of water every so often.
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Re: Multigrade Fork Oil
Multigrade should give you damping which changes less, but it does thin out with rising temperature, so damping will change.Mr. Dazzle wrote: ↑Tue Mar 23, 2021 1:51 pm Surely the idea would be the other way around....damping which doesn't change with the temperature of the oil.
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Re: Multigrade Fork Oil
I didn't say it was a good ideaYorick wrote: ↑Tue Mar 23, 2021 1:53 pmThey work OK as they are. I've never heard a racer complaining that suspension doesn't work at the end of a race.Le_Fromage_Grande wrote: ↑Tue Mar 23, 2021 1:30 pm That's an interesting idea, damping that changes with the temperature of the oil
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Re: Multigrade Fork Oil
Change less than a single grade though....which would make more sense.JackyJoll wrote: ↑Tue Mar 23, 2021 2:15 pmMultigrade should give you damping which changes less, but it does thin out with rising temperature, so damping will change.Mr. Dazzle wrote: ↑Tue Mar 23, 2021 1:51 pm Surely the idea would be the other way around....damping which doesn't change with the temperature of the oil.
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Re: Multigrade Fork Oil
Do your forks get hot enough for the temperature of the oil to significantly change?Mr. Dazzle wrote: ↑Tue Mar 23, 2021 3:22 pmChange less than a single grade though....which would make more sense.JackyJoll wrote: ↑Tue Mar 23, 2021 2:15 pmMultigrade should give you damping which changes less, but it does thin out with rising temperature, so damping will change.Mr. Dazzle wrote: ↑Tue Mar 23, 2021 1:51 pm Surely the idea would be the other way around....damping which doesn't change with the temperature of the oil.
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Re: Multigrade Fork Oil
And hot enough for the difference in hot viscosity between multi and mono to noticeably affect the ride.Le_Fromage_Grande wrote: ↑Tue Mar 23, 2021 3:34 pm
Do your forks get hot enough for the temperature of the oil to significantly change?
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Re: Multigrade Fork Oil
Dunno about mine, but presumably someone's do hence the availability of the product.Le_Fromage_Grande wrote: ↑Tue Mar 23, 2021 3:34 pmDo your forks get hot enough for the temperature of the oil to significantly change?Mr. Dazzle wrote: ↑Tue Mar 23, 2021 3:22 pmChange less than a single grade though....which would make more sense.
EDIT: Just thinking about it some more, it would also make a lot more sense in other countries. We perhaps forget that the UK has a pretty narrow temperature range, it's generally somewhere around 5-25°C with not much variation either side, sure it does get cold or hot but typically we're straight down the middle. What about if you live somewhere like Colorado where it can be -20°C in Winter and +30°C in Summer pretty normally?
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Re: Multigrade Fork Oil
The nerdy kid is trying to prove it's needed.Le_Fromage_Grande wrote: ↑Tue Mar 23, 2021 3:11 pmI didn't say it was a good ideaYorick wrote: ↑Tue Mar 23, 2021 1:53 pmThey work OK as they are. I've never heard a racer complaining that suspension doesn't work at the end of a race.Le_Fromage_Grande wrote: ↑Tue Mar 23, 2021 1:30 pm That's an interesting idea, damping that changes with the temperature of the oil
I've been in pit crews right up to BSB level and at the TT. Never heard of any problems. Often seeing lap records on last lap.
Even Motogp set lap records on last lap.
No hay ningún problema
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Re: Multigrade Fork Oil
Motorsport - particularly top flight- is a very narrow set of conditions though, everything is right in the zone and nowhere else.
As above, damper fluid temperature is deffo a consideration in F1. I know this from making bits for their damper fluid systems.
As above, damper fluid temperature is deffo a consideration in F1. I know this from making bits for their damper fluid systems.
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- KungFooBob
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Re: Multigrade Fork Oil
BTW, I've been to Halfrauds and bought a bottle today.
The viscosity isn't a worry because the forks on Big Red don't have any internals, the oil is just lube for the sliders.... and the branded stuff was double the price.
The viscosity isn't a worry because the forks on Big Red don't have any internals, the oil is just lube for the sliders.... and the branded stuff was double the price.
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Re: Multigrade Fork Oil
I think it's a mis labelled product, it's standard fork oil.
Though forks used to come with ATF in them, I wonder if it's a multigrade ATF.
Though forks used to come with ATF in them, I wonder if it's a multigrade ATF.
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