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Old 15 October 2004, 14:29   #1
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Country: UK - England
Town: Ipswich
Boat name: Obsession
Make: ORKNEY PILOTHOUSE 20
Length: 6m +
Engine: SUZUKI 70
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Posts: 390
Plastic bungs in Prop

This might be a really stupid question,I have just fitted my new Revolution 4 prop and I wonder if anybody can tell what the four plastic bungs are for at the front end of the prop,do they stay in?, or do I take them out?,will I get better performance? in or out?.what are they there for?
Thanks in advance
Wayne
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Old 15 October 2004, 16:16   #2
tue
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Country: UK - England
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They are part of I think what is Quicksilver's VVS (Variable Vent System). The idea is you can get different bungs with different sized holes. They allow a varrying amounts of exhaust gas to pass out and into the blades causing them to slip slightly on acceleration. This gets the motor up into the power band and the boat going on the plan much faster.

I have no bungs in my Laser 2 and it acts like a turbo. Upto about 2000rpm it is normal then the prop vents slightly from the gases and the revs shoot up and the boat takes off without moving the control lever any further!!

Most boats run pefectly well plugged up and theres no real gain in getting ventted plugs unless you want fas t acceleration for skiing etc.
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Old 15 October 2004, 17:57   #3
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Country: UK - England
Town: Ipswich
Boat name: Obsession
Make: ORKNEY PILOTHOUSE 20
Length: 6m +
Engine: SUZUKI 70
MMSI: 235024496
Join Date: May 2004
Posts: 390
Thanks for that Tue, I've hunted everywhere for a answer without success.
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