Boyesen Power Reeds

[Dhadley]

Re: Boyesen Power Reeds

I kinda doubt the tach is off. Especially with the cross referencing youve done. Lets see what Walleyehed thinks. <br /><br />As for the waiting for spring to test -- I wouldnt know about that...lol!!

 

[walleyehed]

Re: Boyesen Power Reeds

The reason I wanted to wait is because I also run a 20P Raker, but on a starcraft 18ft Deep-V, with a 2.5L 200 with XP heads(basically near the same power out-put as a 150XP-same block, different heads)But yours is the 2.6L, maybe a bit more power on your rig..??<br />My boat weighs in at 2575 full of fuel without me, so 2800 with me in the boat...I also have a 6" jackplate and have plugged the top 2 water intake holes on either side of my lower unit.<br />My boat should have a higher drag ratio per foot of boat in the water.<br />I've run 3 OMC tachs, 2 BRP tachs, 2 teleflex and 1 Faria, and then 2 Beedes..The Teleflex hasn't been a good experience because both had different figures than the BRP tachs, which were un-noticable in any difference. The BRP is in the dash to stay.<br />My 20P raker ran in the 4th hole at about 5600, it vented in turns, but not bad. with the jackplate, I can get just a "tad" over 5800, with a slip ratio of around 9% on a good day.<br />I have to wonder if the prop was mis-marked 20 and should have been a 22, but then again, the 19 pitch props you ran, match what I have data-wise real close compared to the 20 Raker.<br />I honestly feel like your rig should handle the 20P Raker quite well, and 5100, to me, just doesn't sound right for the boat/engine combo you have, and being up in the third hole to boot.<br />It would be nice to see 5700-5800 with what-ever prop, but your rig should have that.<br />My opinion is, as I think about it...we have 50GPS, the only true known...but beings we have changed tachs, then verified the tach, and figure a conservative 15% slip with the RPM indicated, it points right at a 22P prop...BUT, you said the 19's ran the same R's only slower, and that fits as well, so I can't say it's a 22P.<br />My only thought would be to try another tach at this point.<br />One more question: the Raker you have, does it just have "RAKER" stamped between 2 of the blades in maybe 3/16" letters, or is "Raker" molded into the casting in a fancy fasion???

 

[muchco]

Re: Boyesen Power Reeds

Good to hear back from you. You never mentioned speed but I would suspect that your rig is running in the 50mph area as well? The fact that the boats stored in the shop for the winter is killing me now. Spring will not come soon enough. I am now inclined to think that I may have a tach issue as well! I will have to have it checked first thing in the spring and get the readings verified. In regards to the raker prop it actually does not have raker marked on it anywhere but does have the OMC part#394753 14 1/2 X 20 on the inner hub. What I had not mentioned earlier is that before I bought the raker I have now, I was using a loaner from my dealer that was the same part number and had RAKER printed between two of the blades on the hub. This prop was within 50 rpm and 1 mph of my current prop, either way pending conditions. That being said I'm inclined to belive that two random props could not have been marked incorrectly or be over pitched the same. I'm quite sure now that I have a tach problem. Gee's warranty is great. Unfortunatley I won't have the answer now until spring. In your or Dahdleys opion if my outfit is running 50gps, at what it appears to most likley be 5500 to 5600 rpm with this 20 pitch raker (using 15% slip). Is this typical performance without a jack plate for my combination? I read so much about guys with 150's XP's or otherwise running 55+mph and pulling 23+ pitch props. My engine runs and starts so well that I can hardly believe that it's not living up to it's potential. That was my intial thought for installing the Boyesen Reeds. At this time I'm going to hold on the reeds and get the tach issue figured out in the spring. I'm going to use the age old adage "if it ain't broker don't fix it". As Dhadley would say I will stick with CHUGGER for now and if I need more performance later it will have to be a 60 degree ZINGER or an E-TEC. Thanks again for the dialogue, these kinds of fourms makr the winter pass and before I know it will be spring and we can talk about a whole nother set of issues or problems. I will keep you guys posted on what I find when I get back on the lake. Lower unit seal kit and some paint and she's good to go. Muchco

 

[walleyehed]

Re: Boyesen Power Reeds

I just went and checked my hub to verify, and My Raker is a 394753 as well..just wanted to make sure...<br />I'm not going to stick to a particular figure, but I "think" your tach is reading about 200-250 low..I could be wrong, of course, but I don't think we are in the 5400-5500 range yet...<br />BTW, My 20P Raker with the jackplate at 5800 is putting me about right at 55mph. I have a Turbo TXP of Dhadley's that is faster, but a bit lower on the R's...very efficient prop.

 

[Dhadley]

Re: Boyesen Power Reeds

Kenny, his 150 is a 2.5 like yours. Basically you both have the same motor.<br /><br />Muchco, if your Raker has the small vent holes it is an early version. They did bite really hard. In fact OMC did back off on the bite a tad with later Rakers. Their reasoning was unbelievable as to why but thats a different story.<br /><br />If your tach has been verified with the shops genuine OMC / BRP shop tack I'd bet its close.<br /><br />Lets play "what if" for a second. First lets look at what we do know has been verified. <br /><br />We have two random Rakers acting very much the same (within 1 mph and 50 rpm). We have at least two tachs reading very close to the the same.<br /><br />"What if" we try another GPS? I know its close to the BRP speed-o but that could be a little strange in itself. Of the 3 things (tach, prop & speed) thats the only thing we havent run a back-up on.<br /><br />Oh -- I know you've made the speed run many times, and we kinda touched on this earlier, but was it in anything that will affect the speed reading? Like current or wind?

 

[Dhadley]

Re: Boyesen Power Reeds

I was just sitting here thinking (I know - dangerous) but lets look at that 50 rpm and 1 mph.<br /><br />If we were at 5150 and 49 mph, our slip is about 8%.