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MY understanding is that the two spec oil for 2 strokes are VP RS7 synthetic, or Maxima 927. If I wanted to run a castor would the VP RC 3 Racing Castor be allowed in CSC and what are some of the club races ( IMI or The Track) use the CSC spec or do they have their own?
the CSC switched to the Maxima 927 in ’05 because of an issue with the VP RC3 at the time. The club series at the CSC tracks (IMI, The Track, and GJMS) have always run the same rules as the CSC.
angie
VP changed suppliers on it and there were bottom end failures as a result. Rotax used to recommend it but no longer. Now Rotax recommends Motul 800. Its a very good oil. Burns clean and stays in suspension.
Yes, we had one of those bottom end failures (at GJMS, prior season). How about we switch to the Motul for next season–I’ve heard no complaints about it, and it’s not so hard to find.
The Maxima 927 is a very good caster oil. It works fine in shifter engines and many Tag engines. However, it is not recommended for Rotax. Rotax very strongly recommends the use of synthetic oil and the Motul after extensive testing has proven to be the best. I have run both oils in our Rotax and the Motul builds far less carbon on the piston than the castor oil. While I have not gotten a difinitive answer yet, there is strong concern that Rotax will not honor the warranty if the customer uses castor oils.
Is oil REALLY a performance item that needs to be spec’ed? Is some clown gonna say he lost the race because I ran Maxima 927 and he ran Burris Hi-Rev? That’s ridiculous. That’s right pal, my oil is simply faster. (I do understand the rotax racers running a specific oil because that’s what the manufacturer specifies) outside of the rotaxians, what it the difference?
OR is this more of a sponsorship ($$) question for the tracks or the series?
Allowing open oil would require that each and every oil and fuel combination would have to be made into a sample to be able to calibrate the meter for each one. This is not practical as the meter must be recalibrated before testing each racer. If you opened the oil choices the tech for fuel would be very limited to what we could check for. There is nothing wrong with using either one of the two oils we spec. It is not the oil we are checking it is the illegal chemicals which could be added to the fuel which enhance performance.
Ran Motul in my rotax and never had an issue; VP during the season and no issues.
Run Maxxima bean oil in my Motori and no issues, Roman’s engine when we took off the cylinder looked new using bean oil.
We’ve got plenty of time to run out our supplies of non spec oils and plenty of time to load up on the spec stuff. It makes spec easier so let’s go (forward)
Brad is right about it being a tech issue. There are some oils that do contain performance enhancers. There are also some that while they do not contain enhancers, they mimick enhancers and again, make tech very difficult. Open oil, like open fuel, makes a mockery of tech. Why control anything if you can’t control fuel.
If we are serious about tech, first we have to spec fuel. The nice thing about VP is that it’s just gas, not oxygenaters of any kind. It is also very consistant. No matter where you buy it, it will pass tech if properly stored. Limiting oil to 2 types (castor and sythetic) covers the needs of most engines and makes fuel tech possible.
Oh ok, thanks for the explanation. I wasn’t thinking about fuel testing when I made my post. I can see how that would complicate testing. I now understand why we have spec one oil.
I agree. The question is, can we switch from VP RS-7 to Motul 800 for the synthetic tech oil? VP is hard to find, and has that reputation for causing lower-end failures, so why not switch?
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