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J_Bar

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Posts: 25
Reply with quote  #16 
quick update!

Mechanic performed a fuel injector drop test and confirmed that all cylinders are firing correctly. Compression is good on all cylinders too. The new controls were installed and adjusted. Mechanic confirmed that the boat is achieving wide open throttle. 

I am still only able to get 5100rpm, so will be testing props next. The weird thing is that the engine scan showed the enginge has hit 5600 rpm. I talked to the prior owner who confirmed that the existing prop is the prop that came with the boat when he boought it.
PhilH12

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Posts: 2,936
Reply with quote  #17 

Quote:
Originally Posted by J_Bar
quick update!

Mechanic performed a fuel injector drop test and confirmed that all cylinders are firing correctly. Compression is good on all cylinders too. The new controls were installed and adjusted. Mechanic confirmed that the boat is achieving wide open throttle. 

I am still only able to get 5100rpm, so will be testing props next.


You haven't mentioned engine height though?  Measuring to the keel on a particular boat is only a starting point.  AV plate above solid water and getting splashed when on plane and trimmed!

You may not want to be chasing props to compensate for the "sea anchor" you may be dragging.  Also, I didn't see it above, but have you checked boat weight itself?  If you've got some soggy flotation, you're also carrying more weight than you think.

Good luck!

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
steelhead

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Posts: 3,479
Reply with quote  #18 
Bay boats are too susceptible to bottom slam bouncing and hair line hull bottom cracking with water logging (hundreds of pounds) of extra weight.  May be the real reason the prior owner dumped it.  Seen it happen here in the Pac. NW, 50 mph into an oyster bed just under water, only bounced once[rolleyes]

Or gel coat has been rough sanded off by oyster shell and sand bar beer partying.  Rough fiberglass is like trying to plane a gravel road.

Did the dealer tech do the cylinder spark ignition drop test, can be a weak coil, not enough high voltage to completely fire off a rich cylinder at high rpms?  Will cause a weak anemic motor.

Can still be partially plugged fuel injectors.  Run a triple dose of E. Fuel Injector cleaner in the gas tank along with 0.5 oz per gal of TC-W3 outboard lube in the gas.  Also can use a small portable tank 3 or 6 gal with same mix, burn at least 20 gals and see if there is an improvement.  Then, follow with E. Carbon Guard every other tank.
Only way to absolutely test injectors is pull and send in to injector test cleaning shop.  They clean and flow test for E-TEC specs.  Several listed on board.


tmd11111

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Posts: 48
Reply with quote  #19 
My money is on motor height and lack of a jack plate.  Bay boat's like the black jack like the motor high up and trimmed out.  Also make sure your trim tabs are retracted all the way..  
redhead

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Posts: 117
Reply with quote  #20 
Is the hull perfectly clean and polished? Any transduced, water pickup or anything else protruding from the hull? With a NEMA 2K instrument you should be able to verify that throttle position is at 100% when you push lever to WOT. The 5600rpm max shown on the software could well be a once time blow out. My max rpm is 5650 but on the computer it shows over 6000rpm.  
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