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25 August 2010, 13:55
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#1
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Member
Country: Australia
Town: Cairns
Boat name: KAHUNAS
Make: Zodiac
Length: under 3m
Engine: 30 Tohatsu
MMSI: wft is a dsc mmsi ?
Join Date: Jun 2010
Posts: 82
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exhaust relief?
Does anyone know anything about drilling the exhaust somewhere in the mid section of the leg so it is releived there rather than exiting through the prop hub?
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25 August 2010, 16:31
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#2
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Member
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
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What for?
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25 August 2010, 21:11
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#3
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Member
Country: UK - England
Town: yorkshire
Boat name: little vicky
Make: avon ex RNLI
Length: 3m +
Engine: tohatsu
Join Date: Mar 2008
Posts: 2,310
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once had to drill one out on a 1960s J.A.P. SEABEE,as the owner wanted to use it on a shortshaft transom boat and the engine was a long shaft shaft and it would not start owing to to much exhaust back pressure, but that was a one off ,
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25 August 2010, 21:23
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#4
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Member
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,875
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Quote:
Originally Posted by Bus_Boy
Does anyone know anything about drilling the exhaust somewhere in the mid section of the leg so it is releived there rather than exiting through the prop hub?
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It was an 80's raceboat mod. The idea was to let the exhaust gases escape via a short-cut giving less resistance. The noise was incredible. 
'SeaBee', that's a blast from the past. A pal had one when we were kids, we ran it on an old ex-RN sailing dinghy. 
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26 August 2010, 09:02
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#5
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Member
Country: Australia
Town: Cairns
Boat name: KAHUNAS
Make: Zodiac
Length: under 3m
Engine: 30 Tohatsu
MMSI: wft is a dsc mmsi ?
Join Date: Jun 2010
Posts: 82
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Purely interested for the increase in noise. The ones i've heard, they basically sound like when your motor is out of the water and your flushing it, only with the whole leg in the water!
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26 August 2010, 12:20
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#6
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Member
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,671
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Exhaust is usually a tube inside the leg, so unless you can fabricate a duct to the outside, there's going to be exhaust pressure getting to places it shouldn't.
Sounds like a fast road to a dose of Tinitus to me!
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26 August 2010, 13:44
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#7
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Member
Country: UK - England
Town: Salcombe, Devon, UK
Boat name: BananaShark
Make: BananaShark
Length: 10m +
Engine: 2xYanmar 260 diesels
Join Date: Mar 2003
Posts: 4,225
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The OCR racers drill the Yamaha 130's out as they are far too quiet for a race boat as standard, I would never drill out a leisure engine as it will knock quite a bit of value of it and unless you do it right it will reduce the back pressure and reduce the power!
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Cookee
Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
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26 August 2010, 15:47
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#8
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Member
Country: UK - Wales
Town: Here
Boat name: doggypaddle
Make: Avon 5.4 Searider
Length: 5m +
Engine: yamaha 80
Join Date: Jul 2007
Posts: 1,107
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Quote:
Originally Posted by Cookee
The OCR racers drill the Yamaha 130's out as they are far too quiet for a race boat as standard,
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is this something learned off the Saxo chavs?
Noise = Power 
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I am usually not as green as i am cabbage looking.
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27 August 2010, 09:36
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#9
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Member
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,671
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And you forgot Power is also directly proportional to the diameter of your tailpipe! 
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29 August 2010, 20:49
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#10
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Member
Country: UK - Wales
Town: Here
Boat name: doggypaddle
Make: Avon 5.4 Searider
Length: 5m +
Engine: yamaha 80
Join Date: Jul 2007
Posts: 1,107
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Quote:
Originally Posted by 9D280
And you forgot Power is also directly proportional to the diameter of your tailpipe! |
And inversly proportional to the number of active brain cells
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I am usually not as green as i am cabbage looking.
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29 August 2010, 23:08
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#11
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Member
Country: UK - England
Town: Portishead/Falmouth
Make: Ribeye
Length: 5m +
Join Date: Jan 2007
Posts: 161
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Might as well hook up a stereo and some speakers in your boat and play a V8 soundtrack at full blast. People will hate you either way but at least you'll get a decent price for your engine after.
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30 August 2010, 09:00
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#12
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Member
Country: Australia
Town: Cairns
Boat name: KAHUNAS
Make: Zodiac
Length: under 3m
Engine: 30 Tohatsu
MMSI: wft is a dsc mmsi ?
Join Date: Jun 2010
Posts: 82
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Geez i copped a fair bit of flak over this one didn't i lol !!
http://www.youtube.com/user/gbusa66#p/a/u/1/ZVEl47nHvTk
Sounds allright to me
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30 August 2010, 09:10
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#13
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RIBnet admin team
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 13,069
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Quote:
Originally Posted by Bus_Boy
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Sounds like it'll piss an awful lot of people off if you do more than pass by once...
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