Repower 2004 AR210 with MR-1 HO's

[84rzv500r]

it fits...

 

[84rzv500r]

 

[Julian]

Wow.....that is amazing!!! Did you have these engines handy?
So it went from 270hp to 320hp?

Quite the project!!!!

Is it finished yet?

 

[84rzv500r]

Wow.....that is amazing!!! Did you have these engines handy?
So it went from 270hp to 320hp?

Quite the project!!!!

Is it finished yet?

320 HP and room for SVHO's now if I feel so inclined... the SVHO's are pricy (about 10K for a complete one) and require 160mm pumps... finished... not yet but soon.. I started the weekend after memorial day... pulling the mockup engine today.. and some final details in the new engine room... gonna foam the new bulkhead and touch up some paint and glass that I couldn't reach with the mockup in the way... new engine install starts this week!!!

 

[84rzv500r]

finished exhaust transitions... I'll drop them off at the welding shop this week...
roughed in the cushion bases and went hole saw happy... needed access for the tower mounts and the port armrest... So i got the bright idea to just add two more speakers rather than the access plates... I have one more set of line outs on my head unit... Made a new port armrest base...

 

[84rzv500r]

yeah I know that you can see the seam and I could have wrapped it a bit better but Im using 1 1/4 closed cell neoprene foam and it will last 10 times longer than the cheap white vinyl... I used some scraps as I am gonna be tight on the foam to finish the whole boat... and I cant get any more at the price I got this at... it doesn't get water logged like the regular seat foam... and I dont want any stitching in the covers if it can be avoided.... I did the first ones with French seams and they look great till ya get drunk on an island and get muck into the seams

 

[84rzv500r]

ran outta daylight pulling mockup engine...

as you can see in the AR210 there is room to stand between the engines in the hole..

 

[84rzv500r]

pulled the mockup motor and cleaned everything up... need to clearance for oil cover bolts and them paint my way outta the hole... starting the engine assembly on the new units...

 

[4x15mph]

I haven't been on for some time and I come back and find the greatest post ever! Unreal and incredible work - what do you do for a living? Engineer?

It does seem like a lot of work for only a slight bit of increase in power but thats not why you do things like this. Would putting some rotax ever be possible or are their pump design and electrics prohibitive for this?

 

[84rzv500r]

I haven't been on for some time and I come back and find the greatest post ever! Unreal and incredible work - what do you do for a living? Engineer?

It does seem like a lot of work for only a slight bit of increase in power but thats not why you do things like this. Would putting some rotax ever be possible or are their pump design and electrics prohibitive for this?

Building big fast Computers and solving technical problems pays the bills for the last 45 years... Engineer, Mathematician, Computer Scientist by education, Beer drinkin farm kid by trade... or vice versa...

This is my first boat and im learning.. the repower was to get out of the fuel hungry short lived 2 strokes and while its only 25HP more per side it will provide another datapoint... Im watching the 250 HP 1.8 SVHOs as there are Motec ECU's for them. I now have room for them now after the mods for the MR-1 HO's...

I have a Rotax 4-Tec 155 in my temp boat... it would be possible however there are additional issues to resolve beyond the drive line... the Rotax engines are closed loop cooled with a heat exchanger plate... not unsolvable but more complicated than the Yamaha Parts Bin Swap LOL

 

[84rzv500r]

in case you were wondering what the Yamaha design was for engine mounts was... just a chunk of aluminum bonded and wrapped in glass... I considered this but opted for my 3/4" bonded homebrew composite Coosa board birch plywood sandwich and 316L stainless wrapped in a layer of cloth and resin...

bonding in some Coosa board for engine oil cover/bolt clearance... should get 3/8-1/2" clearance

all bonded in... a cloth and resin here and there, a quck sand, topcoat...

 

[84rzv500r]

using the old filler as a vent hole and the old fuel tank vent is moving forward with the new 66 gallon bladder tank in the Ski locker... new vents and blower fan/hose on order for stern..

 

[Beachbummer]

That's a big fuel tank! Would love some pictures as you have them of that setup.

 

[84rzv500r]

we're still refining the bladder tank should be here end of November

 

[84rzv500r]

using the old filler as a vent hole and the old fuel tank vent is moving forward with the new 66 gallon bladder tank in the Ski locker... new vents and blower fan/hose on order for stern..

View attachment 166284

what this boat needs is more Cowbell....

 

[84rzv500r]

third topcoat. done painting. done structural. engine pissers and thermostat through hulls installed... electronics boxes all layed out.. will install tomorrow... clean up the fiberglass stuff and put away... time to start cleaning engine parts and assembling..

 

[84rzv500r]

That's a big fuel tank! Would love some pictures as you have them of that setup.

Its on the order of this but to the Specs I provided in another post... EDIT: mybad added the tank specs...

 

[84rzv500r]

finally goin back together now...

Still chasing vent parts...

 

[Julian]

finally goin back together now...

Still chasing vent parts...
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I gather you took the space used for the existing gas tank - thus moving to the ski locker? Hope that much weight that far forward doesn't make it too bow heavy.

 

[84rzv500r]

I used about 2/5 of the space from the original tank... the engines are gonna be 120lbs heavier and the fuel is 120 lbs more as well.. so i had to move the fuel weight forward... I did a rough weight and balance like you would an airplane before I started... the CG moves slightly forward... so I'll limit the boat to 6 people... in reality I've never had more than 4 people in the boat at one time and its 90% Me (215) and Blond Beach Barbie (103) and some Coors light, occasionally the grandson a magma kettle grill and a couple of fish poles... I do have some practical data with the old setup as I often mount my 250 LB Yamaha generator in the bow between the front seats and the boat is much more stable in the light chop... also a little down on the trim tab keeps the thing from porpoising above 50 MPH and settles the boat down and keeps from unporting the jet intakes... trust me the 20mm shafts dont like to slam back in the water WFO as it usually twists them off right behind the splines... My bigger concern is drawing a little more water at rest/idle as i run skinny water all the time... oh and another trick so you can leave the Bimini up at speed is to adjust the poles in the rear so the bimini has zero angle of attack...