Twins on a V20

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captwalt

New member
how would a pair of 100s or 115s work on this hull? had a friend years ago with a pair of 105 chryslers but don't rember how it worked. thanks Walt
 
seem's like V4s would be too wide. but boy would it haul ###.can't make up my mind.use my twin 115 mercs or buy a new 4stroke suzuki.
 
twins are way to heavy on these boat's stick to one motor the last several with twins were slugs and super stern heavy. twins 140's don't truely mean 280 hp closer to 180 to 210 hp in a super heavy package. your twin 115's would be close to 140 to 160 hp, but you twin V4's would weigh 1000 to 1200 lbs plus 8 carbs to feed vers a single V6 150 to 225 would weight in around 65o lbs and only 6 carbs to feed. twins don't add evenly when rated together, you would be better off fuel mileage and weight wise go this a 175 or 200 even a 225 would way out perform the twin 115's or a set of 140's.
 
I think santas sleigh is going to make a trip to Ed's marine after the first of the year.I belive a new 250 4stroke Suzuki is in my future. I don't have the plate on mine. I hope it's rated for it. if not I guess a 200 will do.LOL
 
Getting a bit off subject but. Skools Out how did you like that Manatee you restored? A friend just bought one that needs work and has never been out in it.was wondering how it rode? Thanks Walt
 
I would highly recommend checking the weight on the 4 strokes before buying one. A comparable 2 stroke usually weighs significantly less. My V21 with a 150 honda on the back is stern heavy.
 
I checked and the 250 weighs in at 580 lbs. the 140 @ 421lbs. don't know how much the 2 strokes weigh. seems like thats about 100lbs more then my old 200 merc. as this is my first V20 what would you guys recommend? it has to be new and push the boat about 45 wot with a load.
 
The easiest way that I have done research on motor weights is going to nada.com When you go in there under the consumer and the boat link there is an outboard section. Get the year of your V20, assuming a maximum 200hp in that year (or whatever your plate says) look up a 200 of that era from different manufacturers. Then take a look at your 4 stroke options. I believe ETEC's are lighter weight....might do better there. I love the Suzuki's though. They are great motors.
 
Parrot6909 said:
The easiest way that I have done research on motor weights is going to nada.com When you go in there under the consumer and the boat link there is an outboard section. Get the year of your V20, assuming a maximum 200hp in that year (or whatever your plate says) look up a 200 of that era from different manufacturers. Then take a look at your 4 stroke options. I believe ETEC's are lighter weight....might do better there. I love the Suzuki's though. They are great motors.
Click to expand...

Keep in mind that usually doesn't include the weight of the prop, on board oil tank, gear oil etc.

It all makes a difference if your scuppers are already at the waterline.
 
Thanks for all the replys so far. talked to my Daughter last night and here's what I have.it's a 1986 V20 former I/O with a bracket that is foam filled for more floation. shop that did the work said they used this type so I could use a 4stroke. it's in NJ all wraped up like a big Christmas present.I live in florida so ill have to tow it home soon and unwrap my new pride and joy. traded my 2 Mercs for an alum trailer today. it's a 2009 tandem axle float on. now just have to pick a motor. what would be the max hp on a set up like this? my plate is broken off and it had a I/O before. Thanks for all the help so far. Thanks again Walt
 
A neighbor had a 75 model with a pair of 85 Yamaha's and it ran well. An old fishing buddy had a 74 model with a pair of 70 Evinrudes and it topped out at less than 35 mph, wouldn't come close to planing on one. My old 72' model was rated for twin 115's but never saw one with over 200 hp. The old Yamaha 3 cylinder two strokes would be a good choice for twins, light and fairly fast.
 
It all depends on how fast you want to go.....mine has a Johnzuki 140 4 stroke and gets 40 mph loaded light.

I believe I have seen guys with 200 2 strokes say they can go 50 - 55 mph.

What is the bracket rated for?
 
I like bracketed boats, you will too captwalt. The potential problem is having a outboard hanging on the bracket with a lot of setback and causing the boat to be stern heavy. A modern 150 4-stroke weights in about the same as the older 2-stroke 250's. I like the power of the 250EFI on mine but at 500 lbs with 30" of setback it is not the most practical. The boat was much better balanced with the old 2.4 liter 200 at about 375 lbs. Speed is why I chose to mount the 250 on my center console and it still ain't fast enough. Twins would be sweet but the weight distribution would be all messed up on the bracket.
Just one more thought, filling any normally dry part of the boat with foam does not make the vessel any more bouyant under normal circumstances because you have not changed the displacement. In fact it will decrease the bouyancy by the weight of the foam. However, if you start to take on water, the foam will help by preventing water from filling the areas where the foam was installed and should prevent the boat from sinking to the bottom.(Floatation Foam) Kinda like a empty water bottle with the lid on is very bouyant. Take the lid off and you can make it sink to the bottom. Fill it with foam lid on or off and it will still float.
Get that thing down to FL and take the wraps off. We need boat porn, ie. lots of pictures.
 
Thank's for the replys guys. I understand about the foam and agree it's great for floation when your sinking.but somehow whats in this bracket lifts the back of the boat way up. she had a 235 johnson and it still sat a bit high. im used to a 30ft gradywhite with twin 4strokes. it sat level even full of fuel. the bracket is custom made by a fab shop on LongIsland NY. it has a platform and enough room for twins. I dont know what it's rated for and cant see plate with shrink wrap and i guess alot of snow.LOL was going up this weekend but not in all this crap. added brakes to the other axle on the trailer over Christmas weekend.now i have a top of the line trailer,new electronics and no boat. but on the up side Santa brought me a new reclining chair for Christmas.LOL
 
Sweet. I got new funiture too, I figured Santa would know I was bad this year. I guess I can step it up a notch.
I don't know how your bracket is constructed. I asked Stainless Marine about how much floatation the single 30" setback added. It is just a big hollow space, kinda like a box. They said around 350 pounds when submerged. Hard to figure how much it is actually aiding in floatation at rest because it is not fully submerged. I am not against the idea of foam, it just wouldn't be a great idea for my bracket as it has an access cover that you have to remove to get to the mounting bolts for the bracket to boat as well as the lower motor mounting bolts.
 
Just got a call back from the fab shop. bracket has a 30in back space,6ft swim platform made for single or twins foam filled that is encased in fiberglass(no rotting or water log problems) hp up to 600 for twins 300 single. he said not to put more then a 175 or 200 4stroke becouse of the weight being so far back it will cause your bow to raise real high in following seas and an overall crappy ride. he recomended a 2stroke. his advice is from a aquasport 20ft cuddy with same setup. guess he's moving to NC as rent is to high in NY. he said if i buy my motor from ed's on the way back he will hang it for me.
 
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