[Eric_Oz_S2]

You know Flash, it doesn't really matter does it? As I keep saying the problem is fixed. There is no problem now. I know you always like to have the last word so feel free to reply. I won't bother replying again.

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[flash]

understanding how the oiling system of the rotrex works would probably help you a lot in understanding why it is unnecessary to bleed the system , and that what you did was NOT bleeding the system.



as for "fixing" it, if you didn't just unkink a hose without knowing it, or something like that, my guess is that you starved the head unit (possibly by having the reservoir mounted too low, or not enough oil cooler, or the oil cooler too high). this would fool you into thinking that you "fixed" it by reintroducing fluid to the head unit. however, the next time you run it fast enough to pull the fluid from it again, your problem will return.



but don't listen to me. i only spent a year and a half working this out, all the while getting input and tips from the best guy in the country on the rotrex.

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[tamathumper]

A year and a half ago Rotrex put out an "Important Update" recommending positioning the supercharger unit above the oil reservoir, citing a change for the C8 seals, but ending with an overall recommendation for all units. Will there be a kit update?

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[Lear35A]

Tara is right. The notice is on the lower right of the rotrex.com home page in the R&D area. What is the D1R position on this warning?

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[flash]

i knew about this before it happened.



there will be no update for the D1R kit. we don't have that seal, and consequently the oil won't leak into the supercharger.



they did not suggest this for the C30 and C38. they said the see a similar change coming, which is to say they see changing the seal in the C30 to the same one they have now in the C8 and C15.



technically speaking though, the D1R kit already has both of those units below the supercharger. this was in anticipation of the change. the only reason that we get the gravity fill, as if it were above, is due to the oil cooler being so far below the reservoir. this creates a pressure head through the inlet hose, continually filling it.



did everybody note though, that they said the supercharger sucks the oil into it. this is why there is no bleeding needed. it bleeds itself, and vents the air through the cap of the reservoir, which has an air gap in it.

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[tamathumper]

In post #10 of this thread, you said it was critical to have the reservoir at the *highest* point, but now you're saying it's already below the supercharger. May I ask which one is correct?



Also, I read Rotrex's update very differently - according to their final comment, it's not dependent on that seal... "We foresee a similar change in the future for the C30 and C38 families of superchargers, however at this point no decision has been taken. Nevertheless it is always best to position the supercharger above the canister and oil cooler to avoid any risk of leakage in case of wear or damage to the high speed spindle seal."

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[flash]

i was really only referring to eric's car. he almost exclusively tracks that car. that puts more demand on the reservoir. the location is only critical in as much as it helps ensure flow. i probably chose that word poorly. but since the supercharger draws the oil, in the end it really doesn't matter all that much. what matters more is that the reservoir has fluid in it so that the supercharger doesn't get starved. they designed the reservoir to self bleed, so once you get it primed, the system takes care of itself. as long as there is any fluid at all in the supercharger, it will pump the system, assuming there are no restrictions, and the fluid isn't breaking down (which it does at about 175 degrees F). i imagine though that if you got the fluid hot enough, or if there was any restriction, you might aerate the system momentarily, and you would see the reservoir level fluctuating. it would then have to cool down in order to self bleed again. unless the fluid level is too low, there is no other way i can see to get air into the system once it is running.



as for the "recommendation", they are covering their butt. for many years this was not an issue. dealing with this new seal illuminated another potential problem. i see what their concern is, and not having fluid dumping into the unit when it isn't running solves the problem. they don't want to deal with warranty claims. the units are not rebuildable, and so they would be sending out new units. that gets expensive.



regardless, the D1R system hose routing is set up to maintain fluid in the hose at all times, so that the supercharger always has oil available. it does not put any pressure on the system though, and should not push oil past the seal when not running. that being said, that is why i said to route the hoses exactly as shown in the instructions.



we are now, and have been for some time, WAY off topic.

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