hpi shocks and oil

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kdfi

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How come silicone shock oil can't be used in HPI 5b shocks? It says not to use it in the manual/instructions.
 
becouse hpi shock oils are really "fork oils".. it used to be that you don't want the shock oils to foam up, but really it works better. thats why the hpi's handle so great. couse the fork oil foams up really nice.. thats also why hpi shocks are proned to leaking. becouse of the pressure build up. you can use regular shock oils and you can also get fork oils at the atv shop. i don't think its a good idea to use fork oils in regular shocks as they will leak very easy. thats alo why hpi shock bottoms have that weird lower end design to compinsate for pressure build up.


sorry for the late post..
 
just got through installing a complete set of front HPI HD shocks on the rear and installed the HPI HD insert kits with HPI springs on the rear ramp shock casings. Mann!!! the stock Ramp shock shafts look like tooth picks compaired to the HD HPI's. Seems a lot smoother too. Soo as this rain stops I 'm taking it out. Should have some nice mudd too:D;)
 
I actually asked HPI about why silicon oils aren't reccomended. I was told that it was mainly price. Silicon oils are a lot more than conventional fork oils. Regarless I am running HPI oils in my Ramps shocks.
 
kryptonite said:
HOW MUCH SHORTER ARE THEY? and what wait oil did you use.. hpi oils or silocone
Click to expand...
Hey krypt,I used the 40wt the set of shocks came with (it's only enough oil to do 2-1/2 shocks though). And the LHS had 30wt HPI oil so I have that up front. Ya know, I didn't check if they were shorter or not. The HPI shocks were the same length as the rear Ramp shocks. And the rear Ramp casings with hpi inserts made them the same or very close to the stock front Ramps shocks. I can check if you want. They do fit well though except the rear bottom caps touch the lower arms. So to free this up a little I used a sanding drum bit for the trusty dremmel. Sanded down the area where the cap touched to give the cap more room to set. I am not sure if I even needed to do this because it didn't look like it would effect performance. It's just the cap was riding up on the mounting eye (see pic). Since I have an extra set of arms I just did this to test it out. If the arm breaks because of the tiny bit of sanding, then I will just live with the cap touching on the replacement arms. Unless someone out there has an idea, I am always open to new ideas.LMK if you need any picsfronts1.webp

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