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Author Topic:   Montauk Engine Bracket Position

montaukmax posted 11-30-2001 08:05 PM ET (US)
Another question for the Montauk owners out there. My 90HP 2-stroke merc is mounted as low as possible on the transom. I noticed at a BW dealer that all the motors were mounted up one hole. I imagine a higher mounting would give better performance.
What mounting arrangement has proved most successful for you?
Thanks for any replies!
Dick posted 11-30-2001 08:43 PM ET (US)
The Boston Whaler rigging sheet specifies one hole up for that engine.
I am running a 1999 Montauk with a Merc 50/4stk and have settled on two holes up.
I would start at one up do a test run and then try two up. My cavitation plate is about 1 1/2" above the bottom of the boat.
whalerron posted 11-30-2001 11:19 PM ET (US)
Why does raising the engine mounting position have a positive effect on performance?
Blackeagle posted 12-01-2001 12:26 AM ET (US)
Less lower unit in the water means less drag and a shallower draft.
The reference article on engine brackets talks a little bit about engine height.
http://continuouswave.com/whaler/reference/engineBrackets.html
RHLOOS posted 12-01-2001 10:43 AM ET (US)
Talking with Yamaha Mechanic when installing my outboard, they always keep cavitation plate with-in 1" of bottom of hull. Rob
FISHNFF posted 12-02-2001 11:17 PM ET (US)
When I purchased my Merc 90 4-stroke, the shop mounted it on the second hole up (One hole exposed). I have since moved it up another notch to the third up (Two holes exposed) without any excessive cavitation, even in rough water. I have noticed a slight increase in acceleration and top speed, and a lighter steering.
llewellyn posted 12-03-2001 06:37 PM ET (US)
My 1988 Montauk had an 89 Johnson on it. I replaced it with a 2002 Merc.90hp Saltwater.
The dealer used the existing hole locations in the transom which resulted in engine's bottom bolts being mounted in top engine plate holes, and top bolts in 3rd from top engine plate holes. The anti-cavitation plate was about 1.75 inches above the bottom of the hull. At WOT, and approaching it,the
bow porpoised significantly in spite of trim
in all the way. Chuck Bennett,WhalerCustomer Service,recommended the anti-cavitation plate be even with or slightly above the hull bottom.It is now and problem is solved.
llewellyn posted 12-04-2001 10:26 AM ET (US)
Additional note:Engine is mounted one hole up, and anti-cavitation plate is just above hull bottom.

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Author	Topic: Montauk Engine Bracket Position
montaukmax	posted 11-30-2001 08:05 PM ET (US) Another question for the Montauk owners out there. My 90HP 2-stroke merc is mounted as low as possible on the transom. I noticed at a BW dealer that all the motors were mounted up one hole. I imagine a higher mounting would give better performance. What mounting arrangement has proved most successful for you? Thanks for any replies!
Dick	posted 11-30-2001 08:43 PM ET (US) The Boston Whaler rigging sheet specifies one hole up for that engine. I am running a 1999 Montauk with a Merc 50/4stk and have settled on two holes up. I would start at one up do a test run and then try two up. My cavitation plate is about 1 1/2" above the bottom of the boat.
whalerron	posted 11-30-2001 11:19 PM ET (US) Why does raising the engine mounting position have a positive effect on performance?
Blackeagle	posted 12-01-2001 12:26 AM ET (US) Less lower unit in the water means less drag and a shallower draft. The reference article on engine brackets talks a little bit about engine height. http://continuouswave.com/whaler/reference/engineBrackets.html
RHLOOS	posted 12-01-2001 10:43 AM ET (US) Talking with Yamaha Mechanic when installing my outboard, they always keep cavitation plate with-in 1" of bottom of hull. Rob
FISHNFF	posted 12-02-2001 11:17 PM ET (US) When I purchased my Merc 90 4-stroke, the shop mounted it on the second hole up (One hole exposed). I have since moved it up another notch to the third up (Two holes exposed) without any excessive cavitation, even in rough water. I have noticed a slight increase in acceleration and top speed, and a lighter steering.
llewellyn	posted 12-03-2001 06:37 PM ET (US) My 1988 Montauk had an 89 Johnson on it. I replaced it with a 2002 Merc.90hp Saltwater. The dealer used the existing hole locations in the transom which resulted in engine's bottom bolts being mounted in top engine plate holes, and top bolts in 3rd from top engine plate holes. The anti-cavitation plate was about 1.75 inches above the bottom of the hull. At WOT, and approaching it,the bow porpoised significantly in spite of trim in all the way. Chuck Bennett,WhalerCustomer Service,recommended the anti-cavitation plate be even with or slightly above the hull bottom.It is now and problem is solved.
llewellyn	posted 12-04-2001 10:26 AM ET (US) Additional note:Engine is mounted one hole up, and anti-cavitation plate is just above hull bottom.