'08 Ranger Z520
'08 Evinrude ETEC 250 HO
Model E250DHLSCS
Prop: 3 blade, 14-1/2" x 24", Raker II prop with three 5/8" vent holes (Note: ~Prop to Pad height = 5" w/ 6" hyd. jack plate down)
I just replaced my '08 Lightening lower unit with the M/2 gear case. Then the existing 24" prop would cavitate and spin out when trying to get on plane if exceeding 4500 rpm's. This was never an issue with this prop on the Lightening gear case. Therefore, I proceeded with the following 26" & 24" Prop Trials:
The 26" Raker II w/ (3) 3/8" vent holes got on plane in 5 sec, and ran 68 mph at 5800 rpm's. VERY HIGH torque at higher speeds (Very Hard to turn left). This M/2 has no torque tab, only a flat plate. Thoughts?
The 24" Raker II w/ (3) 5/8" vent holes, with 1 vent hole plugged, got on plane in 4 sec, and ran 63 mph while holding at 6000 rpm's. Likely could have run at 6200-6300 rpm's, yet BRP recommended maximum is 6000. Fairly high torque at higher speeds. Lost second plug or would have tried plugging 2 vent holes. Could plugging 2 vent holes increase top end and/or reduce maximum rpm's, vs plugging only one vent hole?
Any knowledgable feedback appreciated!