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Old 17 June 2014, 15:03   #11
kubcat's Avatar
Country: Australia
Town: Sydney
Boat name: Lunasea
Make: Ribtec 890SX
Length: 8m +
Engine: Yamaha ME 421STI x 2
Join Date: Aug 2009
Posts: 459
My 38ft Cigarette with a pair of petrol 8.1L big blocks weighing 500kg each has stainless coach screws holding the engine mounts in. It is a boat designed to do 80mph through the ocean so I am thinking coach screws may work for you.

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Old 17 June 2014, 16:44   #12
Country: UK - England
Town: southampton
Boat name: hydradrive
Make: yamaha
Length: no boat
Engine: sterndrives
Join Date: Sep 2012
Posts: 289
Are you on about the triangle
Front mount , bond wood to hull an glass in an bond 10mm think steel plate to tap in to.

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Old 17 June 2014, 17:06   #13
Country: Finland
Town: Helsinki
Boat name: SR 5.4
Make: Avon
Length: 4m +
Engine: Toh1 3,5 Yam 90/2S
Join Date: Oct 2009
Posts: 886
Originally Posted by yam man View Post
Are you on about the triangle
Front mount , bond wood to hull an glass in an bond 10mm think steel plate to tap in to.
Yes, the triangle. The way You describe it was close to my original idea, but most over here recommends the coach screw route. Guess both ways works equally well, a 12 mm coach screw will bite pretty well in epoxied plywood.

Here a picture of the ones supporting the original 4.3L, they have ally or steel inside.
The main stringers has no wood and are really heavy duty built. In the picture engine room bulkhead, not transom. I am not sure do i need to remove the original supports or not( i rather not)the 3.0,L and 4.3 are pretty much same size.
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fun on a boat is inversely proportional to size...sort of anyway
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