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27-07-2010, 03:13 PM
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#1
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Registered User
Country: Spain
Location: Mallorca
Occupation: Retired
Interests: Boats, boats and boats
Boat name: Patriot and Forca
Boat make: Phantom 21. Falcon Bonito 36
Engines: 200hp Mariner. 2 x GM 6.5 Twin Turbo Diesels
Cruising area: The Med
Join Date: Nov 2006
Location: Mallorca
Posts: 716
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Moving sterndrives
Hi All,
I am a little concerned that the new engines will be wider than the existing Mercruiser engines. If they are too wide, to line up with the existing drive holes, in the transom., what is the best way to resolve this?
Thanks in advance
Pete
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28-07-2010, 12:43 AM
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#2
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Registered User
Join Date: Feb 2010
Posts: 101
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have you any room to move engines forward ?
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28-07-2010, 03:01 AM
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#3
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living the dream
Country: Fl. USA
Location: Where the sun never dies
Occupation: Life Artist
Interests: BOAT RACING
Boat name: i call her baby
Boat make: Aero-tek
Engines: a lot of horses
Cruising area: WW
Join Date: Apr 2010
Location: Where the sun never dies
Posts: 453
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extension boxes and driveshafts then u can run the shafts thru the boxes in an angle !!!!!!! DID IT BEFORE, WORKS FINE !!!!!!!!!!!
Or move the engines forward (like said) and then use driveshafts..but thatway u will change your CG !!! most likeley to the better tho !
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Not as bad as you think i am, just different !
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28-07-2010, 12:05 PM
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#4
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Registered User
Country: Spain
Location: Mallorca
Occupation: Retired
Interests: Boats, boats and boats
Boat name: Patriot and Forca
Boat make: Phantom 21. Falcon Bonito 36
Engines: 200hp Mariner. 2 x GM 6.5 Twin Turbo Diesels
Cruising area: The Med
Join Date: Nov 2006
Location: Mallorca
Posts: 716
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Thanks for the replies. There shouldn´t be much room to move these forwards. As they have the velvet box´s on, they are looking like getting quite close to the fuel tanks, in front of the engines. Am I right to guess, the box´s you mention have UJ´s on the drive shafts?
Thanks
Pete
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28-07-2010, 12:25 PM
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#5
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Registered User
Country: Spain
Location: Mallorca
Occupation: Retired
Interests: Boats, boats and boats
Boat name: Patriot and Forca
Boat make: Phantom 21. Falcon Bonito 36
Engines: 200hp Mariner. 2 x GM 6.5 Twin Turbo Diesels
Cruising area: The Med
Join Date: Nov 2006
Location: Mallorca
Posts: 716
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PS, I´ll post the exact measuremants later today. Here is an overall view of the setup.
Thanks
Pete
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28-07-2010, 12:30 PM
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#6
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Registered User
Country: Job Centre
Location: In a box
Occupation: Chaos's gofer
Interests: Skiving
Boat make: Spectre 30
Engines: 2 x Promax 225
Cruising area: In the bath
Join Date: Mar 2004
Location: In a box
Posts: 5,201
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Quote:
Originally Posted by DAREDEVIL
extension boxes and driveshafts then u can run the shafts thru the boxes in an angle !!!!!!!
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That's an expensive solution. Far cheaper to glass the holes in the transom, then cut new ones at the correct centres. How about the engine beds, will they work with the new motors?
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Chaos for Moderator.
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28-07-2010, 01:06 PM
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#7
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Registered User
Country: Spain
Location: Mallorca
Occupation: Retired
Interests: Boats, boats and boats
Boat name: Patriot and Forca
Boat make: Phantom 21. Falcon Bonito 36
Engines: 200hp Mariner. 2 x GM 6.5 Twin Turbo Diesels
Cruising area: The Med
Join Date: Nov 2006
Location: Mallorca
Posts: 716
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Hi Tony, long time.
The engine bed is a sliid (RSJ style) steal beam, bolted through both sides and lightly glassed over. I will add photos of this later, also.
Pete
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28-07-2010, 04:21 PM
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#8
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Registered User
Country: Spain
Location: Mallorca
Occupation: Retired
Interests: Boats, boats and boats
Boat name: Patriot and Forca
Boat make: Phantom 21. Falcon Bonito 36
Engines: 200hp Mariner. 2 x GM 6.5 Twin Turbo Diesels
Cruising area: The Med
Join Date: Nov 2006
Location: Mallorca
Posts: 716
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Update
Ok, exact measurements no here. Space between engines, at risers, 8cm. Lower down Exhaust Y piece, 6cm. Engines are 75.5cm wide, at risers. Free space on outside of both engines is 29cm. Drive centers are 84.3cm, measured from greace nipples on top of drives. Photos below.
Pete
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28-07-2010, 04:22 PM
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#9
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Registered User
Country: Spain
Location: Mallorca
Occupation: Retired
Interests: Boats, boats and boats
Boat name: Patriot and Forca
Boat make: Phantom 21. Falcon Bonito 36
Engines: 200hp Mariner. 2 x GM 6.5 Twin Turbo Diesels
Cruising area: The Med
Join Date: Nov 2006
Location: Mallorca
Posts: 716
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2 more photos
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28-07-2010, 05:14 PM
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#10
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Registered User
Country: Job Centre
Location: In a box
Occupation: Chaos's gofer
Interests: Skiving
Boat make: Spectre 30
Engines: 2 x Promax 225
Cruising area: In the bath
Join Date: Mar 2004
Location: In a box
Posts: 5,201
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Those drives look far enough apart for diesels, what's the centres?
Drive centers are 84.3cm
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Chaos for Moderator.
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16-08-2010, 11:34 AM
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#11
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Registered User
Country: Spain
Location: Mallorca
Occupation: Retired
Interests: Boats, boats and boats
Boat name: Patriot and Forca
Boat make: Phantom 21. Falcon Bonito 36
Engines: 200hp Mariner. 2 x GM 6.5 Twin Turbo Diesels
Cruising area: The Med
Join Date: Nov 2006
Location: Mallorca
Posts: 716
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Update
The centres on the boat these were fitted in, is 35" (as per owner´s measurements). My centres are 33 1\2". Are the TRS drives the same size / cut-out, as the Alpha 1? If yes, I will have to wait till I get the engines here, and check the centres when the engines are nearly touching. Is there a standard distance, that there should be, between a twin engine setup?
Thanks
Pete
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29-08-2010, 04:50 PM
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#12
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Registered User
Country: Spain
Location: Mallorca
Occupation: Retired
Interests: Boats, boats and boats
Boat name: Patriot and Forca
Boat make: Phantom 21. Falcon Bonito 36
Engines: 200hp Mariner. 2 x GM 6.5 Twin Turbo Diesels
Cruising area: The Med
Join Date: Nov 2006
Location: Mallorca
Posts: 716
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The twins are here
Hi All, The engines are now here. Unloaded and covered for now but after a couple of quick measurements, looks like they will be quite high in the boat. Might have to raise the sides of the engine cover, to allow for the extra height. WOuld there be any advantage of lowering the engines? If I need to glass the transom and cut new holes, would there be any advantage to lowering the engines and drive hieght. I remember hearing about "short" housings (I guess for shortening drive length) and "adapter plates" (I guess for making drive longer)??
Any ideas for this would be great.
Thanks in advance.
Pete
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14-12-2010, 07:44 PM
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#13
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Registered User
Country: Spain
Location: Mallorca
Occupation: Retired
Interests: Boats, boats and boats
Boat name: Patriot and Forca
Boat make: Phantom 21. Falcon Bonito 36
Engines: 200hp Mariner. 2 x GM 6.5 Twin Turbo Diesels
Cruising area: The Med
Join Date: Nov 2006
Location: Mallorca
Posts: 716
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Back to this problem.... The original Alpha 1 drive centre´s were about 33". I have taken many measurements from the new engines and the centres should be about 37 3/4", allowing 4" between the engines. The TRS transom plates are bigger than the Alpha 1 plates but mostly vertically, the width is not much different. So, I need to move the drive holes about 2 1/2" outboard. Does this mean that I must replace the entire transom or can I build up the inner edge of the existing holes and open out the outer edge of the existing holes?
Either way, what´s the best way to do the job.
Pete
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15-12-2010, 08:53 AM
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#14
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Registered User
Join Date: Apr 2009
Posts: 196
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i would offer the engines in to see what they look like in the bay, doesn't really matter how close they are except for servicing, starter, filter etc, you could remotely mount all the movable items away from the centre line, you're going to open up a can of worms by moving the drives which will mean altering the engine beds as well
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15-12-2010, 03:31 PM
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#15
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Registered User
Country: Spain
Location: Mallorca
Occupation: Retired
Interests: Boats, boats and boats
Boat name: Patriot and Forca
Boat make: Phantom 21. Falcon Bonito 36
Engines: 200hp Mariner. 2 x GM 6.5 Twin Turbo Diesels
Cruising area: The Med
Join Date: Nov 2006
Location: Mallorca
Posts: 716
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Its a little difficult to offer the engines into place. I was just concerned that the engines could hit, if not spaced enough. I have heard that it would help with solid plate mountings, instead of rubber mountings but not sure of the "for and against" for these. The front engine mountings will be new and fitted to take the weight so it´s only the transom holes that could be a problem. I plan to move the engines this week, side by side, and get a better idea of the space between each and the consequential centre measurement. I´ll post the results.
Thanks for your info.
Pete
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15-12-2010, 06:31 PM
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#16
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Registered User
Country: Job Centre
Location: In a box
Occupation: Chaos's gofer
Interests: Skiving
Boat make: Spectre 30
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Join Date: Mar 2004
Location: In a box
Posts: 5,201
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Unfortunately I'm not that clued up on TRS's, but assuming the cutouts are larger than Alpha's, then I don't think it'll be too difficult.
If you use the inner edge of the existing cutouts for the new ones, you will effectively be moving the centres further apart. It looks like your original installation used a cradle type front mount, so that should allow for slightly bigger spacings.
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15-12-2010, 07:49 PM
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#17
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Registered User
Country: Spain
Location: Mallorca
Occupation: Retired
Interests: Boats, boats and boats
Boat name: Patriot and Forca
Boat make: Phantom 21. Falcon Bonito 36
Engines: 200hp Mariner. 2 x GM 6.5 Twin Turbo Diesels
Cruising area: The Med
Join Date: Nov 2006
Location: Mallorca
Posts: 716
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Hi Tony. Yes, the cutouts are larger but not much wider, this is my concern. I plan to get the engines side by side, this week, and post more photos and measurements.
Thanks
Pete
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15-12-2010, 07:50 PM
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#18
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Registered User
Country: Job Centre
Location: In a box
Occupation: Chaos's gofer
Interests: Skiving
Boat make: Spectre 30
Engines: 2 x Promax 225
Cruising area: In the bath
Join Date: Mar 2004
Location: In a box
Posts: 5,201
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How much wider are they?
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Chaos for Moderator.
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15-12-2010, 08:05 PM
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#19
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Registered User
Country: Spain
Location: Mallorca
Occupation: Retired
Interests: Boats, boats and boats
Boat name: Patriot and Forca
Boat make: Phantom 21. Falcon Bonito 36
Engines: 200hp Mariner. 2 x GM 6.5 Twin Turbo Diesels
Cruising area: The Med
Join Date: Nov 2006
Location: Mallorca
Posts: 716
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The engines are about 33 3/4", exhaust riser to exhaust riser. The Turbo on one engine will overlap the next engine but there is room for this, as all 4 turbos face the same way. At the moment, the engines are against a wall and hard to get exact measurements, so I plan to pull them out and get them side by side, then measure better.
The centers of the existing drives are 33" apart.
Pete
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15-12-2010, 08:09 PM
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#20
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Registered User
Country: Job Centre
Location: In a box
Occupation: Chaos's gofer
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Boat make: Spectre 30
Engines: 2 x Promax 225
Cruising area: In the bath
Join Date: Mar 2004
Location: In a box
Posts: 5,201
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Quote:
Originally Posted by Tony Davis
How much wider are they?
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the cutouts
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