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Rear damper oil

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Moorey:

   I would be giving ATF Dexron 2 a try.

Bryanj:
What do they specify for the old moggy 1000 dampers now. They were refilable

K2-K6:

--- Quote from: Bryanj on March 16, 2023, 02:08:20 AM ---What do they specify for the old moggy 1000 dampers now. They were refilable

--- End quote ---

Everyone is sxared of rotary dampers now after the Suzuki v-twin reputation that was bkamed on that type.

They did use tgem in Schumacher era F1 though, cost about £35,000 a pair apparently  :o and ran into trouble with material integrity even when made of titanium and stainless steel bespoke billet construction. 

K2-K6:
In this case Ken I can't really see a proboem with starting off on fork oil.

The "shock" fluid denomination seems to come from needing a very stable oil for shear properties over a wide heat range. Single shock application can be running at 3~4 leverage ratios in which any shock performance change is amplified by that amount at the wheel and putting a very high premium on device linearity to avoid riders complaining.  They use synthetic base oil to do this which is expensive but holds characteristic over wide range of use.
They also use multiple adjustment methods to trim performance, from low and hugh speed compression, low and high rebound, volume shift through shock shaft being more inside or outside damper chamber depending on where in stroke the travel is, compensatory floating piston and valving. Also to ramp up end stroke compression damping abd try to arrest a high speed input that could clatter right through the travel stroke.

The old type like these shock having nothing like this, also being more or less 1:1 in leverage, will be nothing like as sensitive to oil type.

Avoiding starting with too thick an oil is desirable, with too much hydraulic resistance giving a wooden feel on initial compression and not allowing the spring to do it's work if it's correct spring rate.

Oddjob:
Ta Nige, I'll stay with the 5w the Marzocchi had in them in the first place, I'll see how they perform and adjust if necessary.

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