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Old 02 September 2008, 15:03   #11
Country: UK - England
Town: Looe
Make: Delta
Length: 4m +
Engine: Mercury
Join Date: Apr 2004
Posts: 1,332
Originally Posted by Turbodiesel View Post
Yes itw worth it!. Prop guards can take anything upto a third of your hp depending on which type you go for!!!
They are all horrible!!. The stainless steel ones are pretty good, but not cheap. And Plastic ones are ok but dont last very long. There is no easy answer!!

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Old 02 September 2008, 16:31   #12
Country: UK - England
Town: cornwall
Boat name: nothing
Make: rib eye 430
Length: 4m +
Engine: tatsu 50
MMSI: 666
Join Date: Mar 2006
Posts: 1,914
Re propguards
The setup the beach lifeguards on their 30 mariners on the Arancias looks pretty good along with a stainless prop . They certainly take a hammering and still seem to kick out the power with 4 people aboard , I could take a look for you re pitch and prop type for you on Sunday if you like . If I can get a look between training sessions

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Old 02 September 2008, 19:12   #13
Locozodiac's Avatar
Country: Other
Town: Lima-Peru
Boat name: Nautile
Make: Sea Rider Boats
Length: 4m +
Engine: Tohatsu 18 /30 HP
Join Date: Sep 2007
Posts: 1,706
Originally Posted by C2 RIBS View Post
Cheers for everyones knowledge. Engine good after service and just out of warranty, it is fixed to 30hp and have fitted a guard called propguard, an 11inch model for this engine, so will have to see how it performs when next out and then tinker with your ideas. Cheers Ian
Hola Ian

Just to get the nail out, your 25 Mariner was factory delivered adjusted to: 20 or 25 timming ? Which one ?

Have you changed the 25 air restrictor gasket for the open air 30 gasket ?

To have a well converted 30 HP engine both issues works together.

Remove the prop guard, with same prop, why don't you water test the 30 converted engine and let us know if it was better than when at 25 at full throttle. Once adjusted to 30 HP must fine tune engine lean/rich, gas/air mixture needle, slightly towards rich.

Happy Sibbing
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Old 12 September 2008, 12:11   #14
Country: UK - England
Town: Bristol
Make: Delta
Length: 8m +
Engine: Twin 225
Join Date: Apr 2003
Posts: 153
Check my post on here about durajets - I think that they may soon be replacing prop guards!

The prop guards they use on the beach lifeguard boats are stainless steel racing guards which are matched to the prop and the engine - normally a tohatsu.

Having used them you get very little power lost as the gap between the edge of the prop and the guard is minimal. Also the metal around the prop is very wide and creates a kind of duct.

There are definitely a big difference between the performance of different guards out there.

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Old 12 September 2008, 12:50   #15
Country: UK - England
Town: Hamble
Length: 9m +
Join Date: Dec 2002
Posts: 2,256
Originally Posted by Turbodiesel View Post
But if your engine still has any warranty left you could void whats left of it if anything goes wrong.
And who is there at Barrus with the intelligence to spot that it had been modded?

It is better to remain silent and be thought a fool, than to speak and remove all doubt!
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