Search results

  1. G

    Prop Selection - Bayliner 175

    This thread is about prop selection, but earlier my compression test numbers and method came up. I re-verified my old numbers using the old method (all other plugs in, throttle closed) and got the same results. I hooked my gauge up to my air compressor and compared it to another gauge i have at...
  2. G

    Prop Selection - Bayliner 175

    Thanks Scott. Looks like your pitch range was 19P on the large end and 15P on the small end. Were these both 3 blades or 4 blades?
  3. G

    Prop Selection - Bayliner 175

    For my application, what kind of pitch spread would y'all generally expect going with a 2-prop approach? (One prop for fully loaded slower speeds, and one prop for unloaded higher speeds). I get that it's hard to say exactly without testing, but just in general. Are we talking 2" pitch...
  4. G

    Prop Selection - Bayliner 175

    Scott, are you saying 15p is the lowest number you would go with? Or the highest number?
  5. G

    Prop Selection - Bayliner 175

    Thanks for the explanation. That makes sense wrt/ to the lower available power on the 3.0L and the desire to get rpm's up quickly.
  6. G

    Prop Selection - Bayliner 175

    How about this 3 blade? The cost of the merc/quicksilver seems pretty similar to Michigan Wheel and Solas. From what I've read the Alpha 1 can fit a 14 1/2" diameter. Thoughts on the Flo Torq II hub? For the extra $60 kit, seems like cheap insurance against driveshaft damage from strikes along...
  7. G

    Prop Selection - Bayliner 175

    Thanks for the feedback on the 3 blade. I respect y'alls opinions but I'm left a little confused on the recommendation. This may be because I didn't really talk about my typical boating conditions and performance desires. Typically, the lakes/time of day that I plan to boat on are fairly choppy...
  8. G

    Prop Selection - Bayliner 175

    What do y'all think about this prop for my application?
  9. G

    Prop Selection - Bayliner 175

    Your point on the compression test is interesting. When I performed my test the throttle plate was in neutral/idle position and the other non-testing cylinder plugs were still installed. You have me curious if this makes a material difference, so I'll re-run my compression test with those 2...
  10. G

    Prop Selection - Bayliner 175

    This is the prop model that is currently on there: Solas Amita 4 Blade 13.75 X 17P Propeller 3413-138-17 The Solas website doesn't seem to indicate the proper gearcase diameter fitment: I see some 3rd party websites indicating this prop fitment for 4 1/4" gearcases, others indicating 3 1/4"...
  11. G

    Prop Selection - Bayliner 175

    Doing more reading on trim tabs, I'm not as leery as I was earlier about it. That's probably the route I'll go given the results many others have had. I guess I'll find out if it's water logged when i drill the pilot holes for the trim tabs!
  12. G

    Prop Selection - Bayliner 175

    Another thing about this boat that seemed to be perhaps less than ideal was the weight distribution. By that I mean when I was trying to get out of the hole, with no passengers up front (just 2 of us in the center seats), and really no gear (other than basic safety stuff), no cooler, but full...
  13. G

    Timing is retarded ;-)

    Agreed 5300 is higher than this engine should be ran (manual calls for 4800). This engine has a distributor, and no rev limiter that I observed. From what your describing on your 170, it suggests you could have gone over 5000 rpm with the 17" prop if you didn't have the rev limiter. The tach on...
  14. G

    Timing is retarded ;-)

    Thanks for the link to the engine teardown service manual! I searched through that particular manual and didn't see the timing specs listed. What I'm looking at is the below from the Mercruiser service manual 26:
  15. G

    Timing is retarded ;-)

    I meant to say the base timing was set at 2* AFTER TDC per the manual for this serial number engine, not before. So then adjusting distributor to 0* advanced all readings by 2*. Again, still a bit low.
  16. G

    Timing is retarded ;-)

    Agreed Jimmbo. I'll replace the ignition module and report back my timing test results after.
  17. G

    Prop Selection - Bayliner 175

    Makes sense, Jimmbo. The results here are high and consistent readings (in the 170-180 range).
  18. G

    Timing is retarded ;-)

    The compression test results seemed good to me. My results were 171, 182, 181, 171 psi from cylinder 1-4. Others have commented my gauge may be inaccurate as the numbers are higher than expected. Nonetheless the results are all relatively consistent, which I believe is the desired outcome of a...
  19. G

    Prop Selection - Bayliner 175

    When I checked the timing, the tach on the instrument cluster matched the tach on my timing light, so I would think they are both accurate. As far as compression ratio, I could be wrong, but would that not be for each compression stroke? So, while cranking the engine for ~5 seconds we're getting...
  20. G

    Prop Selection - Bayliner 175

    It's certainly possible my gauge is not accurate. My procedure for performing the compression test (cold motor) was to disconnect the distributor wire, remove 1 plug at a time, thread in the hose/gauge into the cylinder, then crank the starter for ~5 seconds until compression stops rising on the...
Top