SkiDoo Rev800 Bondi Ported trail mod engine:



SOME SKIDOO HOTROD STUFF:

SkiDoo Rev800 Bondi Ported trail mod engine:

This is Mike Keating’s sled, cylinders/ head/ airbox modded by Bondi. Since airbox has multiple inlets, airflow measurement was not practical.

Mike’s sled had stock pipe and stock quiet muffler, and we are showing two tests- one with 450 main jets and one with 430’s. Note that this test data was compiled at 40 degree F air temp.

04RV8BN3[pic]

04RV8BN5[pic]

For comparison, we have included test data from bone stock Rev800, DPM, tested at similar 40 degree air temp.

REV8DPM[pic]

Then due to the fact that I have this test session posted in BLOG schedule, we have an 830cc big bore that, compared with the Bondi ported stock bore 800 was seemingly off the mark—since there could have been some problem like slightly out of phase crankshaft, bad CDI etc etc we won’t include the name of engine modifier. Note that airflow CFM was a bit higher than stock, and HP was higher than stock by a similar margin. All trail mod or full mod engines need to be dyno tuned somewhere.

REV830RJ[pic]

12/28 UPDATE: I just got an email from Tweener who built this 830 engine—he said his ignition box provided by him and used in the above test (RJ) was off the mark. He was correct—here’s the same engine tested with stock CDI, according to Tweener set at stock timing (not advanced as indicated in test description). I should not have posted the less powerful test, that was my goof and not intended to make Tweener’s engine or CDI look less powerful than it is (that is why I originally left out engine builder from above test description). Here’s the most powerful pump gas safe test w/ stock timing (I’m also agreeing with Tweener that more than stock timing probably would have helped this engine). Again, this shows that all trail mod engines need to be dyno tuned somewhere. Tweener should get Randy more than stock timing for this 830 and send him back to DTR for additional tuning, no charge, to make up for my aforementioned faux pas.

REV830RHH[pic]

Now, going the opposite direction we have Eirik Ellis’ Rev 600 punched out to 734cc by Rtek. Trail modded pump gas Rev 600’s posted on DTR have gotten 120+ HP, but this big bore exceeds that with ease. This engine has an easy to clutch, flat HP curve with 135 HP from 7500 to 7800 RPM. This test was with stock airbox, measuring 2.5 inches of water pressure negative at HP peak which gave us nearly 90 lb/hr fuel flow..

REV734G[pic]

Lastly with the 734, a Bondi modded airbox was fitted, causing us to lose airflow CFM reading. We did, however measure airbox negative pressure and the wide open Bondi

Airbox showed a negative 1” water pressure. That reduced pressure had more effect upon fuel flow than airflow—note that fuel flow dropped significantly when stock airbox was replaced by wide open Bondi modified airbox. The HP added by the Bondi airbox was likely the result of the reduced fuel flow because of the effect on float bowl vs venturi air pressure difference, and not added CFM airflow.

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