ok now that I've tried 4 alum props

[4.3sunbird]

heres my thinking <br /><br />I have tried hustler 17 and 19 pitch in alum.<br />I have tried my factory omc alum 21 pitch<br />and now have an alum hustler 23 pitch on it <br /><br />I'm now turning around 5200 rpm wot with the 23p<br />speedo said 61 we'll use it just to compare <br /><br />that comes up to 7.5% slip <br /><br /><br />If I go to a stainless which Im thinking a 21 pitch would work the best (IF) the stainless actually has less slip<br /><br />so how would a stainless 21 compare to my alum 23<br /><br />anyone have experience with express series? (turning point props same as my hustlers)<br /><br />do I really need a high $ turbo prop or is there one that would be almost as good for less $<br /><br />thanks guys,<br />RED

 

[ivar]

Re: ok now that I've tried 4 alum props

7.5% slip sounds very good with an alum. prop on that boat, can you verify your speed with a handheld GPS?

 

[ramster]

Re: ok now that I've tried 4 alum props

How can a 4.3 turn a 23 pitch to 5200 rpm? What mods, and how much power are you making? What drive ratio? Can't be a stock motor, my new 5.0 220 H.P. 1.60 ratio, will only turn a 21 four blade AL 4200 rpm, that's in a 195 glastron SX bowrider. I want to try a stainless four blade but I'm afraid it will turn even less rpm's.

 

[TilliamWe]

Re: ok now that I've tried 4 alum props

4.3, if all the info you provide is indeed accurate, and that's a stock 4.3 engine, then you are turning too many rpm. 4800 should be about the top on a 4.3, unless it's brand new & MPI.<br />So, you would need at least a 23 pitch stainless steel prop, not a 21. The rpms would gop even higher with that 21 stainless, compared to the 23 alum you have now.

 

[vettman]

Re: ok now that I've tried 4 alum props

Ramster, Read my post in Mercruiser and Volvo.Something doesn't make sense.You should be turning more. Almost sounds like it's a 23 pitch. Are you triming her up to get max speed and rpm?VETTMAN

 

[vettman]

Re: ok now that I've tried 4 alum props

Ramster P.S. I missed the fact that you have a 4 blade. Thats probably right since more blades mean better holeshot and less rpm and top speed. I think .You read what mine is doing. Later VETTMAN

 

[ramster]

Re: ok now that I've tried 4 alum props

I have tried a 20 pitch Mich. Vortech 4 blade and would rev to nearly 5000 rpm, but only around 52 mph on gps, the Solas 21 only hits 53 @4200rpm on top but has a nice cruise speed of 42 mph at 3200 rpm. I also tried a Mich. Rapture SS 21 3 blade, that was vented so it had a nice holeshot, but topend was really about the same.

 

[4.3sunbird]

Re: ok now that I've tried 4 alum props

sorry guys <br />I had a couple threads going in another forum <br /><br />its not a stock 4.3<br />it has a 3.0 outdrive behind it which is 1.7 to 1 ratio which the 4.3 drive is 1.68 to 1<br /><br />engine consist of <br />non vortech shortblock (roller cammed)<br />.030 over flattop pistons<br />vortech heads with only bowl blend done and valve spring upgrade<br />cast vortech intake with #3 cylinder runner opened up to match the others (you'll see what I mean if you buy one)<br />eldelbrock roller cam under factory roller lifters<br />rochester q-jet carb<br />electronic delco ignition<br />bottom end is deburred and shot peened for stress relief<br />arp fastners and rotating assembly is balanced<br /><br />main thing Im trying to find out now is how a stainless 21 would compare to my hustler 23<br /><br />Im not concerened if It goes back up a little on rpm long as It stays below 5500 @ wot<br /><br />on the omc alum 21 It was turning 54-5500 rpm at 58 mph by the speedo<br /><br />so if I go stainless 21 would I see the speed of the 23 at around the rpm of the 21 alum prop ?<br /><br />suggestions on which brands also .. I'll get a turbo prop if needed but just wondering if any others would do<br /><br />I have located a hand held gps that I hope to be able to try out sometime this weekend but for now Im just using the speedo readings for comparison purposses<br /><br /> ivar : as far as slip is had to be on a slight chop and trimmed out just right to get that <br /><br />on totally smooth water I still cant get over 58 - 59 mph at the 5200 rpm which puts it back into 11-12% slip<br /><br />at cruize acording to the boat gauges Im seeing 44 mph at 4000 rpm with the 23 which shows about 12% slip<br /><br />dont know if all this sounds right ..Im still new to this boat stuff but Im trying to give all the info I can <br /><br />so how would say a turbo 21 prop compare to my hustler 23 alum as far as holeshot , cruize , and wot <br /><br />I say 21 instead of 23 because I dont really want to lower my wot rpm 5200-5400 wot is just fine with me<br /><br />thanks guys,<br /><br />RED

 

[4.3sunbird]

Re: ok now that I've tried 4 alum props

btw Im not sure what difference it makes but I've seen on here some mention what kind of water they are running in ..<br />Im running in salt water in the james river not far from the cheasapeake bay

 

[walleyehed]

Re: ok now that I've tried 4 alum props

For comparison...alum vs. SS;<br />I turn a 19P alum OMC 5200 RPM.<br />I turn a MWC SS 19P 5200, but slightly faster top-end than the 19 alum.<br />I turn a 20P SS Raker 5600 RPM and about 6-7mph faster.<br />I turn a 22P Edge II SS 5600, but about 1mph slower than the Raker...<br />My point here is it's hard to say what it will do when you change blade style, and I would have to say pitch is more important for comparison within one manufacturer, as another brand may have a totally different result.

 

[4.3sunbird]

Re: ok now that I've tried 4 alum props

how about If I drop the rest and just ask your oppinion on what kind of difference I may see between the omc 14x21 alum and a 13 1/4 x 21 turbo1 prop ?<br /><br />I know theres no way to know for sure but I'd still like to hear what you'd expect just by your knowledge of props <br /><br />anyone know a cheaper place to get a turbo prop besides strait from the manufacture I'd like to know .. redsttype@cox.net <br /><br />I've checked out ebay and theres none on there to fit my needs <br /><br />sorry to be a pest ..I just have no idea what to expect

 

[4.3sunbird]

Re: ok now that I've tried 4 alum props

ok Im gonna pull all my hair out (whats left of it)<br /><br />sure wish turbo had a 22 p <br />with my gear ratio a 21 p will only go 62.7 mph at 100% (5400rpm)<br /><br />guess I'll have to go to a 23p after all to be able to run 60+ with slip involved<br /><br />I have found new turbo props for small hubs for $240 .. think I will be able to beat that ?