Dobey1 Posted January 17, 2018 Report Share Posted January 17, 2018 Wanted to know what prop any MA21 owners are running with a Vmax 225? My 21 has a 3 blade 23 and I feel lacks bottom end and can squeeze a few more hundred RPM. Any info and numbers will help. I Want to change this out soon. Thanks in advance. Quote Link to comment Share on other sites More sharing options...
F1sh0n Posted January 17, 2018 Report Share Posted January 17, 2018 If I recall properly, on my 2004 MA 21 with a 250 HPDI, I was running a 21 Tempest Plus Quote Link to comment Share on other sites More sharing options...
all wet Posted January 18, 2018 Report Share Posted January 18, 2018 Not a 225 but 250 Vmax HPDI running a Powertech OFX4-21 Quote Link to comment Share on other sites More sharing options...
fsusteve Posted January 18, 2018 Report Share Posted January 18, 2018 same as all wet, I have heard 22 is the number, I went down to 20 and wasn't happy Quote Link to comment Share on other sites More sharing options...
captpn Posted January 18, 2018 Report Share Posted January 18, 2018 2004 HPDI 225. Had OFX 3 blade 21, couldn't turn it past 5700, and holeshot was poor and way to much porposing. It did however cruise about 4mph over the tach. Now OFX 4 blade 20. So much better, holeshot spectactular, runs level so no more tabs needed, runs square through the rpms, and wings up to 5900. (my engine is mounted all the down. Id like to move it up 1 hole...then MAYBE ill go to a 21 4 OFX, but its all good now) Id rather under pitch a boat for those loaded down days, plus its just better on the engine. Got the prop from the unhappy guy above - thanks Steve:) Quote Link to comment Share on other sites More sharing options...
fsusteve Posted January 18, 2018 Report Share Posted January 18, 2018 Glad that worked out for you, I really didn’t run that prop very long to get a good feel for it, with the 21 I am completely squared up and mid-range/top end is a blast, I need to try a 22 to see how that feels. Quote Link to comment Share on other sites More sharing options...
captpn Posted January 19, 2018 Report Share Posted January 19, 2018 ok, ill buy your 21 4 blade then Quote Link to comment Share on other sites More sharing options...
Dobey1 Posted January 19, 2018 Author Report Share Posted January 19, 2018 22 hours ago, captpn said: 2004 HPDI 225. Had OFX 3 blade 21, couldn't turn it past 5700, and holeshot was poor and way to much porposing. It did however cruise about 4mph over the tach. Now OFX 4 blade 20. So much better, holeshot spectactular, runs level so no more tabs needed, runs square through the rpms, and wings up to 5900. (my engine is mounted all the down. Id like to move it up 1 hole...then MAYBE ill go to a 21 4 OFX, but its all good now) Id rather under pitch a boat for those loaded down days, plus its just better on the engine. Got the prop from the unhappy guy above - thanks Steve:) Off the top of my head isn't the 04 HPDI 225 WOT range 4500 to 5500 RPM's ? 5700 would be putting you past that. Quote Link to comment Share on other sites More sharing options...
mulligan Posted January 19, 2018 Report Share Posted January 19, 2018 16 minutes ago, Ridding_Dirty said: Off the top of my head isn't the 04 HPDI 225 WOT range 4500 to 5500 RPM's ? 5700 would be putting you past that. Yes and no unless it is different than my 05 250. My manual say 4500 to 5500 as well but they changed it in 06 I think because of fouling plugs and such. When I spoke to Marcus and others I was told to treat it as the range went to 6k and so I did. The rev limiters are all set the same, 6150 rpm. It might not be the same with the 225. Quote Link to comment Share on other sites More sharing options...
captpn Posted January 19, 2018 Report Share Posted January 19, 2018 Correct. I couldn't imagine propping for 4500 or 5000... the holeshot /load carrying ability/responsiveness would all suffer. I don't run over 5500 often, but it will do it. I do have to trim it and rooster to get to 5800/5900 but it doesn't loose bite with the big OFX...and at that point tabs are needed a bit, so its all just for show not go... Quote Link to comment Share on other sites More sharing options...
fsusteve Posted January 19, 2018 Report Share Posted January 19, 2018 Yeah my marine tech also said run it to 6k, I rarely get much above 5700-5800 though Quote Link to comment Share on other sites More sharing options...
Dobey1 Posted January 19, 2018 Author Report Share Posted January 19, 2018 1 hour ago, captpn said: Correct. I couldn't imagine propping for 4500 or 5000... the holeshot /load carrying ability/responsiveness would all suffer. I don't run over 5500 often, but it will do it. I do have to trim it and rooster to get to 5800/5900 but it doesn't loose bite with the big OFX...and at that point tabs are needed a bit, so its all just for show not go... If i understand you correctly you are saying a ideal target range would be in the higher 5k range like 5750 RPMS The seller also said to me it can be run a bit higher. At the time I thought that was odd and thought he was just BSing me to think it could get more top end. Guess it is coming together. I do understand WOT Ranges and ideal range for average loads. Quote Link to comment Share on other sites More sharing options...
captpn Posted January 19, 2018 Report Share Posted January 19, 2018 yup, I think 5800 ish is fine...being this is a BIG boat that may get loaded down on occasion. You don't have to run it up there everyday, but it just performs better through the rest of the range. If it runs square, that's right on w 225 HPDI. If you prop for 5000, then you would be putting a higher pitch prop on, and the fun just goes out of the boat... no holeshot, laggy response, no load ability and not good for carbon buildup...but possibly a little faster. Get your hands on an OFX 4 20p and give it a try. These hulls like stern lift and a 3 blade just doesn't have enough. Maybe Capt Troy will reply...he's tried plenty of props on this hull. Quote Link to comment Share on other sites More sharing options...
fsusteve Posted April 21, 2019 Report Share Posted April 21, 2019 Just an update, got my hands on a shiny new ofx 4 x 22, loaded I lost some hole shot which was to be expected, overall i’m happiest with the 4 blade 21 p props i’ve run, prolly be looking to trade soon Quote Link to comment Share on other sites More sharing options...
MikeH Posted April 25, 2019 Report Share Posted April 25, 2019 All Wet and FSUSteve, what kind of numbers did you get with the OFX4-21 with the vmax 250 hpdi? I have a 2008 21 MA with the same engine, but it has an OFX4-23. my max speed is about 62 mph. I would rather have a little better hole shot and possibly sacrifice top end. Quote Link to comment Share on other sites More sharing options...
all wet Posted April 26, 2019 Report Share Posted April 26, 2019 I usually open her up on the way back to the ramp and get 59 to 61 at 5700 - 5800 rpm depending on load, current. Quote Link to comment Share on other sites More sharing options...
MikeH Posted April 26, 2019 Report Share Posted April 26, 2019 Thanks. That is plenty fast! Quote Link to comment Share on other sites More sharing options...
fsusteve Posted April 29, 2019 Report Share Posted April 29, 2019 With the 21 I was squared up, 5500 rpms/55 mph, the 22 i’m Around 62 at 5600 or so Quote Link to comment Share on other sites More sharing options...
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