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Hooksdj

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Reply with quote  #1 
New to me, I have 2014 Striper 220DC with a E-tec 225hp with a stock prop and a 15hp HO kicker. Dry weight is 3,300 lbs. It seemed to run ok up until this last week. Full throttle down and its taking me about 30-60 seconds to get on a plane, maybe even longer. Unfortunately I did not pay much attention to the WOT rpms, I think in the low 5K range. My top end speed is 37-38 mph. Im left with 2 questions, 

1) Why would my prop start slipping so much or taking so long to spin up the rpms

2) Since shops around here are not so willing to loan props any help to narrow down what prop might be a good upgrade for me would be appreciated. 

Serial # 5392370
Model E225DPXAAP

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Hooksdj
PhilH12

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Reply with quote  #2 
Have you changed any "loading" in the boat? ie, new batteries, new locations, etc?  Where is your AV plate now at plane?  Should be above solid water and just getting splashed a bit.

Need to get your WOT rpm's.  You want to be in the Optimum range for your boat/motor and 'typical' load.  Maintenance done? VST filter, fuel filter(s), spark plugs indexed?  The same 'loading' but now slowing down may not be a prop question.

I'm Surely no expert, but these Q's will also help the experts on here answer your questions, I think.

Best,

Phil

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Always check the Easy Stuff First!
20' Weeres fishing pontoon
90 HP E-Tec E90DPLSUM  05184332
Lake Tawakoni, TX - Catfish Capital of Texas
Hooksdj

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Finally got my boat back in the water yesterday and got some numbers. Had 1/2 tank of fuel, 20 gal or so of fresh water and 2 adults on board. Clear day, temp was around 65 degrees, lake was flat with a slight breeze. 
10 sec (give or take) to plane
WOT 5650-5700 RPM
Trimmed up to 40%
41.1 MPH
Made 4 or 5 runs and numbers held consistent.
I do come off plane around 4,200-4,400 rpms at 28 mph.

What has changed, the above numbers were obtained on Kitsap Lake in Silverdale, Wa. yesterday. Last week I was at Lake Cor d Alene in Id. I got to thinking about it and when I was out in the morning I was by myself but planed fine, temp was around 60-70. Whereas in the afternoon I was out with the wife and kid. Slight difference in load but the biggest difference was the temperature at 95, considerably hotter. 

Cav plate is riding right at top water while running.

Does anyone have any experience with outside temp affecting engines performance, maybe some sort of vapor lock or partial lock?

Ultimately I would like to;
1) Fastest hole shot I can get
2) Hold a plane down to about 18-20 mph.  
3) Maintain current top end speed.

 
Attached Files
pdf IMG_1019.pdf (208.02 KB, 16 views)


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Hooksdj

PhilH12

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Reply with quote  #4 
Maybe pick the motor up a hole, but I'm no expert.

Air temps and elevation can affect air density going into the motor - lower/cooler is more "air" - higher/hotter is less, so could be running a bit rich at higher elev's and hotter?  Is your motor affected by the "air box mod"?  I've seen it but forget where on here, so you'll have to search on here - it's been on with pic's, if your motor is affected, and where to drill the new hole - pretty easy, if your motor is affected.  Not trying to make you chase your tail, but pretty sure you need the "other stuff" right before trying a 1/2 dozen new props that won't help much.

Check at the different temps and elevation, and it may lead somewhere else besides props, is my humble opinion.  Then, go for your Goals as stated - with all the props that may be recommended for your application by the experts.  Propping is a "boat by boat" trial and error thing.

Phil

__________________
Always check the Easy Stuff First!
20' Weeres fishing pontoon
90 HP E-Tec E90DPLSUM  05184332
Lake Tawakoni, TX - Catfish Capital of Texas
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