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Author Topic:   Why ???
Sal DiMercurio posted 04-30-2003 12:06 PM ET (US)   Click Here to See the Profile for Sal DiMercurio   Click Here to Email Sal DiMercurio  
Why are you running a 14 diameter that belongs on a "V'6, on a 3 cylinder engine ?
Again, why a 13-3/4 diameter that belongs on a v4 or v6 on that 3 cylinder - 70 hp ?
Theres absolutly no need for all that diameter on your 17' boat, unless you feel the engine needs to be stressed & lead to an early grave.
You don't say what your maximum rpms are with either prop.
It's possible your doing damage to that engine doing what your doing.
Sal
Sal
Sal DiMercurio posted 04-30-2003 12:08 PM ET (US)     Click Here to See the Profile for Sal DiMercurio  Click Here to Email Sal DiMercurio     
Don't know how this post got here, as I was answering Blueboats post of 150 psi update, 4/30/03
Sal
acassidy posted 04-30-2003 12:23 PM ET (US)     Click Here to See the Profile for acassidy  Click Here to Email acassidy     
Talk about leaving us hanging. Sounds like someone was getting it.
jimh posted 04-30-2003 01:29 PM ET (US)     Click Here to See the Profile for jimh  Click Here to Email jimh     
You hit "NEW THREAD" instead of "REPLY". Either that or a RAM DIMM in the server was struck by a cosmic ray or a neutrino as a result created a new thread, gave it a new topic, and used your name and password to do it.
skred posted 04-30-2003 02:49 PM ET (US)     Click Here to See the Profile for skred  Click Here to Email skred     
Yeah, ya gotta watch those neutrinos: I hear they all use Michigan Wheels....
blueboat posted 04-30-2003 04:04 PM ET (US)     Click Here to See the Profile for blueboat  Click Here to Email blueboat     
Sal, Sorry if it made you mad I was running those props. Seems like your leashing out at me. The reason I am running those props is that I have a manual and that is what it lists. You are the 1st person on several boards that has objected to the prop size. What would you recommend? Have you run a 70 hp 3cyc 1974 model on a 17' to get results from? I am a test engineer and I am always looking at improving things but please don’t get hostile or talk down to people. Nobody benefits
Dr T posted 04-30-2003 04:21 PM ET (US)     Click Here to See the Profile for Dr T  Click Here to Email Dr T     
Cosmic rays--I guess our circuit boards are getting a bit dense....How do you distinguish between a random and a RAM DIMM error?
Sal DiMercurio posted 04-30-2003 07:29 PM ET (US)     Click Here to See the Profile for Sal DiMercurio  Click Here to Email Sal DiMercurio     
Blue, a 14" dia prop dosen't belong on a 3 cy 70 hp engine, that size is for a v6 engine 150 hp & up.
I'm not getting hostile, just wondering why the huge prop.
The largest dia I recommend for a 70 hp on your boat is 13", even a 12" will give you better performance.
Think of it this way, engineers build 4x4 pickups & figure the correct tire dia, ...then the kids go out & buy rims for an 18 wheeler & put these monster tires on it, the tranny catches hell bigtime & the speedo isn't even close & what used to be first gear, now acts like 3rd gear,.....same pricipal with the huge prop.
Go to a prop shop & borrow a 12 or 13" dia prop with the same pitch your running now, then come back here & let us know if the engine & boat & you are happier.
Sorry if I sounded gruff, didn't mean to, but did raise my eye brows as to why that size.
Try what I said & let us know.
Sal

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