Notes on this machine: FULL on professional race bike & set up. Magenti Marelli / GET electronics suite w/ sensors & telemetry, custom Ohlins cartridges up front & in the rear WP w/ our own proprietary valving. Motor at this sample was stock internally w/ FULL FMF 4.1 system, dynoed 57.9hp at the rear (2100' amsl) Suter slipper clutch. Fuel of choice for this race was VP110 as we did not have time to develop a additional map for Q16. This bike has 22 hours total on it at time of sample w/ 4 of those hours for this race / race weekend. Race was the last SM National in Tucson AZ racing in the pro class. We have a dyno internally & this bike was broken in properly on said dyno. Redline for this motorcycle is 11.5K, gearing was ok but could have bee a touch better in quite a few sections so we were definitely bouncing off the limiter. Weekend consisted of 2 FULL days of practice, qualifying & for us two final races (4 hours total). Oil used was Mystik 15w50 and has been since we broke it on on the supplied Motorrex 15w50. I list all the above information to paint a picture of how the machine is employed etc.
Conclusions: Clearly the oil sheared to a 30wt & lead is though the roof, however TBN is strong. But at the time of the race our rev limiter was set up as spark cut vs. fuel cut. As mentioned the gearing for the track was not quite right & we were on the rev limiter quite a bit which leads to excessive fuel. Combine this w/ ultra short piston skirts & high crank pressures, etc (modern 450's) in a racing environment Its my thought this is fairly acceptable. We have since changed our limiter protocol to a fuel cut & corrected gearing. I am going to run this oil again w/ these changes, same hours, same track & then run another sample. If we get the same trend I am thinking a straight 40wt or 20w50 to get the shear under control.
Anyway I thought I would share with this forum even though I am not very active at all. Of course any comments or observations are welcome
* I should add for those not familiar VP110 fuel is leaded
Conclusions: Clearly the oil sheared to a 30wt & lead is though the roof, however TBN is strong. But at the time of the race our rev limiter was set up as spark cut vs. fuel cut. As mentioned the gearing for the track was not quite right & we were on the rev limiter quite a bit which leads to excessive fuel. Combine this w/ ultra short piston skirts & high crank pressures, etc (modern 450's) in a racing environment Its my thought this is fairly acceptable. We have since changed our limiter protocol to a fuel cut & corrected gearing. I am going to run this oil again w/ these changes, same hours, same track & then run another sample. If we get the same trend I am thinking a straight 40wt or 20w50 to get the shear under control.
Anyway I thought I would share with this forum even though I am not very active at all. Of course any comments or observations are welcome
* I should add for those not familiar VP110 fuel is leaded
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