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I NEED SPEED!!! Prop question.

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  • I NEED SPEED!!! Prop question.

    I have a 72 Glassmaster with the 2.3 140hp. I took it on the lake today for the first time with my parents and their 3.0 135hp WAXED me on the water.

    My prop is pretty messed up now. Looks like someone didn't care what they were running over

    I know it's time for a new prop but have no idea what to get!! I see all these numbers with diameter and pitch and I have no friggin clue what any of this means or what setup would be best for me! I know I have three blades right now and they're screwed up.. that's it.

    Can someone help me find a good setup so I can at least keep up with my folks!?

    Your help is appreciated!


  • #2
    Re: I NEED SPEED!!! Prop question.

    C-P, some more info will help us to help you. What's the length and weight of your boat and the exact engine type. Also, when you say you "see all these numbers" can you tell us what they are if they're stamped on the prop hub, or do you mean you've seen "all these numbers" in various posts on this site?

    If the numbers are on the prop somewhere, I'd start by going to a prop shop with the prop and see if they can repair the blades. If not the next step would be to borrow a prop with the same numbers. Generally they'll be something like 14 x 19 K which means the prop is 14 inches in diameter with a pitch of 19 inches - the K being the identifier for the shaft fitment. Let us know what your numbers etc are and it will help.

    If the shop will lend you a prop to test it then see if the boat will achieve the lower end of its ideal WOT rpm range when heavily loaded and the top of its WOT rpm range when lightly loaded - if so the prop is about right. If the motor revs too high at WOT, then you need to go up in pitch, if too low you need to go down.

    TII
    TABS 580 Ocean Series - Sold!
    Yamaha F115 - Sold!
    Holden Rodeo LT crewcab ute - still going strong.

    Comment



    • #3
      Re: I NEED SPEED!!! Prop question.

      I have a 72 Glassmaster with the 2.3 140hp.
      Ayuh,... Tell Us what ya Really got,....

      Merc never Ever used a 2.3l motor...
      Any Grease is Better,..... Than No Grease at All.......

      Comment



      • #4
        Re: I NEED SPEED!!! Prop question.

        We'll be glad to help.
        Please read the stickies at the top of the page and get us as much info as possible.
        Prop size may be near the base of the blades or under the prop nut.

        Comment



        • #5
          Re: I NEED SPEED!!! Prop question.

          according to me triton is right

          Comment



          • #6
            Re: I NEED SPEED!!! Prop question.

            Originally posted by ashusood View Post
            according to me triton is right
            Yes,and it is important we establish if the setup is working right.Sometimes a motor has problems,or the tach is wrong or the boat has problems.Without the priliminary numbers there is no way to know which way to go.

            Comment



            • #7
              Re: I NEED SPEED!!! Prop question.

              Originally posted by Bond-o View Post
              Ayuh,... Tell Us what ya Really got,....

              Merc never Ever used a 2.3l motor...
              The previous owner told me Ford 2.3, I'm guessing maybe it's really a 3.0

              @Triton - If I would've found those numbers stamped on the prop I wouldn't have posted in here. By "all these numbers" I mean all the different diameter x pitch setups. I'm pretty sure that a shop WILL NOT let me test out different props like you suggest. I guess I'll just ask someone at the marina shop, maybe they can help.

              To clarify, the boat is a '72 Glassmaster 8 passenger 18ft with a Mercruiser 140 hp I/O

              Comment



              • #8
                Re: I NEED SPEED!!! Prop question.

                Originally posted by steelespike View Post
                Yes,and it is important we establish if the setup is working right.Sometimes a motor has problems,or the tach is wrong or the boat has problems.Without the priliminary numbers there is no way to know which way to go.
                The tach doesn't work :/ The speedo read 32 mph WOT with 4 150ish lb adults.. The prop, to me, looks like the same prop on my other two boats size wise. I can find the diameter with a tape measure if that helps.

                Comment



                • #9
                  Re: I NEED SPEED!!! Prop question.

                  unfortunately your not giving us too much to go off of. makes it hard to just say "x" will work.

                  we must have tach info to know how the boat is running. this will let us know less or more pitch then what you have currently....what do you have currently is also a must. look on the hub. usually stamped there.

                  we really want to help but your not giving us anything
                  If you dont know how to fix it the RIGHT way dont!!

                  1996 Rinker Captiva 212 5.7lx

                  Comment



                  • #10
                    Re: I NEED SPEED!!! Prop question.

                    Don't be surprised if mid 30's is all it will ever do no matter how much money you throw at it .....
                    Any opinions expressed above are worth exactly what you paid for them!

                    Comment



                    • #11
                      Re: I NEED SPEED!!! Prop question.

                      ChevyPower, the following information is absolutely mandatory in order for anyone to offer any type of recommendation to you:

                      1. EXACT peak RPM operating range of your engine...I assume you don't know this since you're not even sure what size your motor is. So if you provide us with exact and complete serial numbers from your engine and outdrive, someone here can probably decode it.
                      2. The pitch dimension of your current prop. This will be stamped somewhere on almost all props. You will often need to remove the prop to find the numbers. Whatever numbers you find, share them.
                      3. Your current RPMS when running at your top speed. (yes, this means you MUST have a functional tach hooked up)

                      If you cannot provide 1, 2, and 3 above, then you really have no option but to try locally at a local marina or prop shop. They can slap a random known prop on the boat, test drive-it (again, absolutely mandatory to do this with a functioning tach), see how it performs, and try another to move your RPMS in whatever direction you need to go.

                      I also strongly suggest, before you do any of this, that the boat be given an extremely comprehensive tune-up....points, plugs, wires, cap, rotor, adjust/set timing and carb, compression check, throttle cable adjustment etc etc etc. Buying a prop that is designed for a poorly tuned motor would be a waste of money.

                      Correct propping is 100% based on engine RPM. So without a tach you are 100% dead in the water...

                      Comment



                      • #12
                        Re: I NEED SPEED!!! Prop question.

                        Got the tach working today.. 5,000 rpm WOT. The prop is original from 1972 and the serial number is no longer legible.

                        Tune up was recently done by PO.. supposedly. But the engine runs like it should. If I had tune-up issues I'm sure I would be able to tell regardless of what prop I'm running.

                        I'm giving you guys all I can. I also contacted the marina shop. They weren't cool with letting me test drive different props til I found the one I wanted.. figured as much.

                        Comment



                        • #13
                          Re: I NEED SPEED!!! Prop question.

                          Its very possible that a prop is not your solution.
                          The motor may have a problem,Perhaps as simple as the throttle isn't opening all the way.
                          Motor could have issues like bad valves,bad rings,timed wrong,running on 3 cylinders.
                          Boat could have problems,a hook in the bottom or it could have absorbed water in the hull or the flotation foam under the floor.The only way to tell whats up is a test run lightly loaded
                          Assuming everything is right a 18 footer should run about 40 mph and have a decent hole shot.When trimming up the boat should respond.Basically we have no info.
                          Perhaps your parents prop will fit your boat; get the tach fixed and make some test runs.
                          Having you read the stickies is so you know what we need in order to help you.
                          Its not like training 101 or something. If you just want to stab in the dark
                          On a healthy boat and motor a 17" prop should get you a good hole shot for water sports
                          but you may have to watch the max rpm ,oops what am I saying. A 19 should give good all around performance with slower hole shot. Less likely to over rev. but could lug.
                          If your likely to carry 8 often then the 17 is probably the better choice.

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                          • #14
                            Re: I NEED SPEED!!! Prop question.

                            Did you even read my last post?

                            THE MOTOR IS IN GOOD CONDITION! Sure a NEW 18 foot 3.0 should run about 40 mph, this boat and motor is 39 years old! The boat has a decent hole shot and planes like it should. I do not have bad valves or rings and I'd know if it were running on 3 cylinders. I do the maintenance on ALL of my vehicles, as a matter of fact, I just replaced the timing belt and water pump in my Ranger and set the timing afterwards. If I had problems with my motor I would be in a different forum posting a different thread.

                            I just took the boat out today, like I just stated, the tach read 5k at WOT and after adjusting trim I got up to around 34 mph. If you would've READ my post the current prop is, for lack of better words, SCREWED UP! It looks like someone put the prop on some pavement then turned the engine on, I doubt this is what actually happened.

                            I gave you guys ALL the info asked for with the exception of the prop's s/n.. so BASICALLY you have most of the info.

                            Any HELP would be greatly appreciated. Thanks!

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                            • #15
                              Re: I NEED SPEED!!! Prop question.

                              Rebuild the prop and Go Forward.
                              And you have No Pics?? of the prop?
                              SO What engine do you have?

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