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Rank: Dedicated Tin Star
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Location: Ketchikan, Alaska
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Have a 32 foot Marinette that I put 350 Crusader engines in. Anybody else have 350's and what size props are you using?----- If your old engines are shot and you want new engines and fresh water cooling and to be able to get parts for them, this is the cheapest way to go. Even got new transmissions with a warantee for another $1000 per engine if I got them with the engine. Cheaper than rebuilding the old ones. Now it's time to put more money into it and buy new props. Any ideas guys?
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Please Register : New members may not post until approved. An email is sent after approval. We do this to reduce those who use these forums for spamming.
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Michigan Wheel has a great free service. www.michiganwheel.comComplete info form E mail and they will let you know which is the best match for your engine, boat etc. dave
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Is that 350 CUBES or HP? If cubes, the stock props should work assuming the trans ratio is also similar).
Jeff
"Don't follow me--I'm lost!" (From the Simpsons)
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Rank: Dedicated Tin Star
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Location: Ketchikan, Alaska
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That's 350 cubes (5.7 liter). Everybody uses the Chevy 350 block and then adds their own manifolds and other parts. It's the only engine made now, in this size, that you can get with reverse rotation. My 318's were shot and to piece some together would have cost way more than new 350 Crusaders. The H.P. is about 300 so the old props are a little small. Ran them one season and they worked OK, but I know that they are not quite right. ---Hit a big log the last trip so now I have to change props. Did catch some big silver salmon and little halibut so we had fun and it was worth it. --Ed
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i have a used set of 14 x 11 that come on 360's that may need some repair .i might trade for your 14 x10 set"what u should have had on 318's".
tim
72 32' express
"http://www.theboaters.com/boats/Powerboat_Express_Cruiser_marinette_1972_anticipation"
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Thanks but I have 14x11's on there now. The 14 RHx11 is good, the 14 LHx11 is repairable but I think it will hang on the wall for decoration.--Ed
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Ed, I have 350 C I D 270 hp Crusaders with 1 1/4" shafts the props from the factory are 16-16p with slight cup. Had Wolverine Propeller, revamp them to 16 - 15p with no cup so I could get slower trolling speeds works good at top end also lost 3mph at top end running @ 4150 rpm on port & 4075 rpm on the starboard the top end speed doesn’t bother me for I seldom run at max usually run @ 3000 rpm get about 21 / 23 mph depending on conditions. Hope this helped PS My  is a 32 F/B sedan Norm, s Live On 
KEEP YOUR BUTTS DRY &YOUR HOOKS WET. (also your whistle)
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Rank: Dedicated Tin Star
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norm ,you must have gear reduction trans to run 16x16 to 4150 with 270 hp
ed ,are your new trans 1 to 1 or gear reduction?
man i wish i would have changed mine to 350's buying a running 318 rebulding and replacing risers is still cheaper .but 300 hp would be great .and i would have taken the money out of my 401 before it dropped.hind sight is 20/20.
tim
72 32' express
"http://www.theboaters.com/boats/Powerboat_Express_Cruiser_marinette_1972_anticipation"
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Tim,
I still have the BW velvet drive 1:1 transmissions. That way the trans and the rear engine mount stayed the same.--Ed
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Tim,
You are right I forgot to mention the 1:5 to1 V/D trannies Oops.On the WOT the manual calls for
min. 4200 rpm max. 4400 I’ve been really trying to get the WOT at least up to the high 4200 rpm
will try a complete tune up this spring plus rebuilding of the electronic distributors when I
changed the rotor & caps I noticed significant bit of rust build up through out the two units. Now
on the 1" shaft size I wonder just how large of props they can take before there is to much strain
on them? As Dave B. suggested it may be worth have a prop place give a evaluation on how big
one can go with the prop size on 1" shaft & still be in the safety zone.
Norm,
KEEP YOUR BUTTS DRY &YOUR HOOKS WET. (also your whistle)
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Ed:
There's a write up on props (including hi-performance 350 repowered 32 footers) on this web site under engines and etc.
Jeff
PS: This is embarrassing! I don't know how to get to that info even though I, ah, compounded and submitted most of it.
"Don't follow me--I'm lost!" (From the Simpsons)
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ed ,try what jeff has first. but you can figure it buy pitch per hp you had 450hp and had 11'' pitch =40.90 hp per inch meaning 600 hp at 40.9 hp per inch would be 14.6'' pitch.acording to some things i have read you should have had 10'' pitch witch would be 45 hp per inch pitch at 600 hp needs to be 13.33333 ect.
as norm said ,i don't know if 1'' will handle 300 hp .also `14'' od di props may slip alot . if you go to bigger od di the pitch needed will be less.but to what extent i don't know.
p.s. don't spend your money by this it's not perfect just gets you in the ballpark.and i have 14'' x 11'' on my 318's too
72 32' express
"http://www.theboaters.com/boats/Powerboat_Express_Cruiser_marinette_1972_anticipation"
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I went through this on my old boat. (Sea Lestial) Actually just saw her out there yesterday looking good. Engines were Marine Power 5.7L 315 hp carb. 1:1 Trans Michigan wheel said 14 x 10 after I filled out all their forms. I called them and asked them how a boat that ran well on 225 hp engines with 14 x 10 could possibly use the same props with 315 hp. They insisted. Don't know who was the bigger idiot - them or me for listening to them! Turns out they don't sell the right size prop so they just recommend the closest thing they sell. Over 3800 rpm props would break free no more speed increase and 5000++ rpm! Tried 3 blade 14 x 12 heavy cup - only hit 3700 rpm. about 30 knots though :) Tried 3 blade 14 x 12 light cup - 5000++ rpm and climbing (broke free again). There are two problems with this setup. Excessive blade loading and excessive tip speed. 300+ hp is too much for a 3 blade 14" prop. At 4400 rpm the tips of the propellers are going too fast to bite the water. I ended up with austral propellers 4 blade 13 x 12. They make a 4 blade that will fit on an 1 1/4" shaft. Lost a little top end but very smooth and quiet. or try Larry at http://www.accutechmarine.com/ Tell him I sent you and he might give you a break on the computer analysis. (John Hall 44' Striker). He normally charges IF you don't buy the props from him. Good guy to deal with. Good luck John
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John,
Thanks for the info, too bad you had to learn the hard way. Anything you do to a boat there seems to be a lot of people blowing smoke and a few that really know what they are talking about. Will get started on the boat project soon I hope. --Ed
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I have access to a prop calculator, if you will send me your info I'll run it through.
Would need Boat weight, length, HP per engine Max RPM, cruise RPM & transmision ratio.
Roger
The trouble with getting old, There is a lot of info in memory, I either can't find it or don't trust it if I do!
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That's the info I wanted you to hear about, Ed. Thanks, John.
Keep one thing in mind: There's a HUGE difference between a prop selected for WOT, all out performance and one selected for optimum CRUISING. A prop that will produce a good cruising speed on your boat at around 2,500 to 2,800 rpms is what you need, not one that allows the maximum speed at WOT--who the hell can afford to run a boat like that! (My FloScan goes from 8 GPH at a 2,500 rpm cruise to well over 16 GPH at 3,000 rpms--and that's just one engine.)
I have deliberately over-propped my 32 footer to limit the WOT rpms to 3,900. This produces a gas (and engine) saving 2,500 rpm cruise speed of 20 mph burning 8 GPH per engine. (Running at 2,000 and 14 mph produces even better gas mileage, but I don't like poking along.) And even with these huge, 17 by 15 four bladers, the boat leaps out of the water, which proves that it's hardly laboring.
Finally, a prop that spinning fast (using 1:1 drives) may 'break away' at full throttle, but at reduced cruising rpms it will be just fine; and if there's enough pitch on it, like an overdrive in your car/ truck, gas mileage will be maximized.
Jeff
"Don't follow me--I'm lost!" (From the Simpsons)
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