10-27-2010, 10:55 AM #1
- Join Date
- Nov 2007
Do away with SC slip by building waste gate
wouldnt it be much easier to build a type of waste gate on intake between SC and IC or TB and have it set to release pressure at 15psi or wherever you want it.Much like the wastegates on turbos that limit exhaust pressure.Or would it totally mess up the fuel system.It just seems that this would be much better than the type of slip set up in todays SC.I mean then on race boats you could be positive about your intake pressures at rpm instead of adjusting slip which can change after installation,with different oils,etc.Plus then full sythetic slippery oils could be used not the current seadoo or jaso cert.oils?Just a thought after rebuild 5 or 6 SC this year any thoughts on this>Marvin
10-27-2010, 11:23 AM #2
The clutch is there to keep the shaft from snapping or whelel from blowing apart on sudden decel when the momentum of the wheel want's to keep it spinning. The wheel is spinning @ 40000+ rpm's or 5.2:1 over the engine rpms. If you decel and the engine drops from 8000 to 3000 the wheel cant drop 26000 rpm's in a split second without something breaking so the clutch is there to cushion this. Has nothing to do with the boost really.
10-27-2010, 12:25 PM #3
The SC is gear driven the turbo is gas/air driven. You cannot equate/think about them the same way. What u refer to is basically a BOV which some members have proven actually hurt our scs. The only better approach seems to be the rotax hydraulic setup which is expensive and requires machining.
10-27-2010, 01:09 PM #4
I would think with all the machinists and knowledgable people on this forum, that someone could come up with a clicker type one way lockup clutch.
10-27-2010, 01:13 PM #5
10-27-2010, 01:24 PM #6
Now your talking. I was thinking even something as simple as ramp notches in the gear and matching ramps on the washers.
10-27-2010, 02:05 PM #7
10-27-2010, 02:09 PM #8
10-27-2010, 02:10 PM #9
10-27-2010, 02:16 PM #10
Say at 8000 engine RPM the SCer is doing 40,000+ rpm so when you drop the throttle and the engine come back to idle in less then a second the SC has to slow down by 30,000+ rpm in the same time that is alot of turning energy that needs to slow down, so at this point the clutch starts to slip bringing the wheel down gradually to match the engine again, If you had a BOV fitted the boost from the SC gets blown out into the hull, if you dont have a BOV it backs up against the throttle plate and trys to go backwards through the SCer, this inturn slows the wheel down faster then the clutch could on its own, this means the clutch has to do less work and therefore has less heat put into it and less wear.
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