MikeSchaper
Seaman Apprentice
- Joined
- Jan 27, 2009
- Messages
- 31
Morning all and thank you in advance for any help you can give.
This motor started out on a 1989 Lund Tyee 1850 and had a 23p prop on it. I picked up the glastron last year and switched the motor over to the glastron. I left the 23p prop on and set the motor at the lowest bolt holes possible. With this set up I ran about 5800 Rpm with the speed matching about the same. I got a nasty chine walk though. This may have been due to the trim tab missing not sure. Either way I have since added the trim tab and bought a new prop since the 23 was a tad chewed up.
I had it in my head that I already had a 19p prop on there, not sure why that was just the number in my head so I bought a 14 X 19p aluminum prop to replace the steal 23p. With the motor still set on the lowest hole I took it out. Even though the chine walk was gone I could not steer the boat while at WOT, and WOT was only about 4600 rpm's. I deceided to try moving the engine up two holes. By doing this I was able to gain control of the boat at high speeds and eliminate torque steer. But now I am still only running at about 5000 RPM at WOT. Top speed of about 46mph. It seems to me that such a light boat should get out of the hole better than it does and go a bit faster than 46. From what I have read the operationg rpm should be 55 to 5700? Am I correct on this?
Open to suggestions. My next step was going to be to move the engine up or down one more hole. Where it sits not I cant trip it up high enough to make it come out of the water which I am sure is a good thing but maybe I would gain the rpm by doing so? Was also considering a 21p prop but I am worried my take off will suffer and with a teenage daughter that is a show skier I cannot have that! HAHA
I am learning all this on the fly and though I have a strong mechanical background the marine world is fairly new to me. Though being a John Deere engine distributor I am learning more and more about the diesel end of marine and not enoug about my own craft.
This motor started out on a 1989 Lund Tyee 1850 and had a 23p prop on it. I picked up the glastron last year and switched the motor over to the glastron. I left the 23p prop on and set the motor at the lowest bolt holes possible. With this set up I ran about 5800 Rpm with the speed matching about the same. I got a nasty chine walk though. This may have been due to the trim tab missing not sure. Either way I have since added the trim tab and bought a new prop since the 23 was a tad chewed up.
I had it in my head that I already had a 19p prop on there, not sure why that was just the number in my head so I bought a 14 X 19p aluminum prop to replace the steal 23p. With the motor still set on the lowest hole I took it out. Even though the chine walk was gone I could not steer the boat while at WOT, and WOT was only about 4600 rpm's. I deceided to try moving the engine up two holes. By doing this I was able to gain control of the boat at high speeds and eliminate torque steer. But now I am still only running at about 5000 RPM at WOT. Top speed of about 46mph. It seems to me that such a light boat should get out of the hole better than it does and go a bit faster than 46. From what I have read the operationg rpm should be 55 to 5700? Am I correct on this?
Open to suggestions. My next step was going to be to move the engine up or down one more hole. Where it sits not I cant trip it up high enough to make it come out of the water which I am sure is a good thing but maybe I would gain the rpm by doing so? Was also considering a 21p prop but I am worried my take off will suffer and with a teenage daughter that is a show skier I cannot have that! HAHA
I am learning all this on the fly and though I have a strong mechanical background the marine world is fairly new to me. Though being a John Deere engine distributor I am learning more and more about the diesel end of marine and not enoug about my own craft.
