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How Big Can i go?
- Thread starter sideman8
- Start date
Welcome to the board. I would think that engine would work well on the back of a 19' boat. I have a 2.4L on the back of a 16' trimate. Works very well.
Whats the HP rating on the hull?
Whats the HP rating on the hull?
groucho
Member
That motor will work fine. BUT and it's big one....Don't go out and expect to run flat out right away without some quality "seat-time" as that ride will be "walking" all over the place. ( Granted this a 19' boat but I'm guessing you haven't had a Checkmate before ??) Unless you have already done a lot a high-performance boat driving w/a V-bottom you'll have to learn some of the nuances of chine-walking before it starts to happen at high speed.( no fun barrell-rolling)
Also if that boat is set-up right you will be running at some serious top end. Make sure you that have it rigged right. Then you'll really enjoy the ride that comes w/it!
Also if that boat is set-up right you will be running at some serious top end. Make sure you that have it rigged right. Then you'll really enjoy the ride that comes w/it!
groucho
Member
The first absolute must is a dual cable steering set-up. This boat may already have it but in 76 it may have been rigged with just a single cable set-up. You can also go to a " Sea-Star" type system but it's certainly not required for this application and frankly I think you lose alot of the "feel" of driving with it VS a cable type application when learning to drive a performance V-bottom.
The next thing to consider is a jackplate. Again you don't have to get one initally but ultimately you will probably end up purchasing a new or used one. It will improve the performance of your boat considerably plus it gives much more set-up options than just bolting the motor to the transom. ( Which you still can do if your budget like everybody's has limitations...) Which size to get? That's a thread all it's own. I'll suggest as a baseline a 6" CMC manual plate. It's relatively cheap and you can find them both new and used on this board, Scream and Fly and ebay too. But I know others will have different opinions so ask.
Get a good prop and for the right price and run it at the right height at the right RPM. Sounds easy enough doesn't it? Well some of us have spent our lives trying to figure out how to get this combination right. This is where you ask lot's of questions. Should I run a LaserII 22"? How about a Trophy 24" 3 blade vs 4 blade? How far below the pad should I set it? Can I keep running it @ 6100rpm? The answer is if it works for your rig sure!
The trick is to do what are doing already and ask as much upfront so that when you make your first pass you already know 10 times more than we did when did we made ours. That's the benefit you have from learning from our speed " trials" over the years. It's a lot of fun....
I've over-simplified a bit but you get the idea. If you have a question...ASK!
The next thing to consider is a jackplate. Again you don't have to get one initally but ultimately you will probably end up purchasing a new or used one. It will improve the performance of your boat considerably plus it gives much more set-up options than just bolting the motor to the transom. ( Which you still can do if your budget like everybody's has limitations...) Which size to get? That's a thread all it's own. I'll suggest as a baseline a 6" CMC manual plate. It's relatively cheap and you can find them both new and used on this board, Scream and Fly and ebay too. But I know others will have different opinions so ask.
Get a good prop and for the right price and run it at the right height at the right RPM. Sounds easy enough doesn't it? Well some of us have spent our lives trying to figure out how to get this combination right. This is where you ask lot's of questions. Should I run a LaserII 22"? How about a Trophy 24" 3 blade vs 4 blade? How far below the pad should I set it? Can I keep running it @ 6100rpm? The answer is if it works for your rig sure!
The trick is to do what are doing already and ask as much upfront so that when you make your first pass you already know 10 times more than we did when did we made ours. That's the benefit you have from learning from our speed " trials" over the years. It's a lot of fun....
I've over-simplified a bit but you get the idea. If you have a question...ASK!
boatman4021
Well-known member
I wouldn't run a 225 on a 21' boat without hydraulic steering. A 19' boat is out of the question. The kind of speed that boat will run requires hyd. steering. Checkmate even says that any boat that will reach 70+ should have hyd. steering. boatman
bartsboat
New member
I have an '84 Diplomat. I saw on another post that the Diplomat hull was not designed to go over 60 mph. I have an 8" Powerlift setback and a '91 200HP Johnson coming. I'm still exploring what to do for a lift, might not use the setback. I bought a dual cable Teleflex rack steering setup. I planned on that and using an OMC Shooter 25 pitch 4 blade prop.
The BMA plate on the boat says max 150 HP. The dry weight difference according to the NADA site is about 140 lbs. more than my 140 Rude but only 70 lbs. more than many 150 HP motors from '84. Does this sound like a recipe for disaster or have others rigged a Diplomat similar to this?
I thought that rating was just a sissy test anyway but I'm warped in many of my thoughts.
If you're not livin' on the edge you're taking up too much space.
The BMA plate on the boat says max 150 HP. The dry weight difference according to the NADA site is about 140 lbs. more than my 140 Rude but only 70 lbs. more than many 150 HP motors from '84. Does this sound like a recipe for disaster or have others rigged a Diplomat similar to this?
I thought that rating was just a sissy test anyway but I'm warped in many of my thoughts.
If you're not livin' on the edge you're taking up too much space.
groucho
Member
The ratings did get more conservative sometime after the early 80's. ( I can't recall when exactly) My 72' MX-13 Checkmate had a HP rating of 85 Max. There's no way any 13' boat would get a rating like that today. ( I started w/a 50 Merc on it, then a 85 hp, and finally a screamin' silo 6 cyl 100hp on it!)
All things being equal on your boat, proper set-up, experience in driving abilty, and all of that if you are dialed in properly you now start approaching speeds where gearcase " Blow-Out" can become an issue.
I don't if I've ever seen it discussed on this board as typically the speeds are below 80 mph. ( I know many of you DO go faster!) That or if they are over that speed they have a gearcase on that engine has the proper low-water/torpedo shape to prevent " Blow-Out" . If it happens at high speed your bow drops, the nose goes to the port side and it drops fast enough you can catch your gunnel and roll. HARD! ( I did in a Hydrostream Valero w/a stock 200 Johnson.) It hurt me and the boat quite a bit...
If you have it happen to you once you'll NEVER want it to have it happen to you again!
All things being equal on your boat, proper set-up, experience in driving abilty, and all of that if you are dialed in properly you now start approaching speeds where gearcase " Blow-Out" can become an issue.
I don't if I've ever seen it discussed on this board as typically the speeds are below 80 mph. ( I know many of you DO go faster!) That or if they are over that speed they have a gearcase on that engine has the proper low-water/torpedo shape to prevent " Blow-Out" . If it happens at high speed your bow drops, the nose goes to the port side and it drops fast enough you can catch your gunnel and roll. HARD! ( I did in a Hydrostream Valero w/a stock 200 Johnson.) It hurt me and the boat quite a bit...
If you have it happen to you once you'll NEVER want it to have it happen to you again!
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