engine height

Joker2 · #1 10-11-2011, 08:49 PM

I think my motor is too low, tons of spray when underway, Engine is mounted through the top hole 25" shaft, cav plate is under water when going fast, I can't see it. Here are some pics when i am going about 2000 RPM

THEFERMANATOR · #2 10-11-2011, 09:05 PM

You need to lok at it when your on plane. you want the lower cavitation plate(the one just above the prop) to be at the waters surface. Just above the surface gives the best performance, but I like to set em so that it runs just below the surface about a 1/4-1/2" so I can keep the prop burried when in rough water. But you should still be able to see it when your on plane.

Joker2 · #3 10-12-2011, 02:18 PM

Thanks, yeah when I am on plane it looks about 2" below the surface, You might have seen all my past posts trying to find out my RPM problem (4200 Max) and speed issue (32 MPH on GPS ), It sprays up water pretty good when going 4200 wondering if this could be creating drag, the pic's stink. Do You think I should move it up 1 or 2 holes? I will try to get better pics over the weekend. Thanks

reelapeelin · #4 10-12-2011, 05:59 PM

Quote:

Originally Posted by Joker2

Thanks, yeah when I am on plane it looks about 2" below the surface, You might have seen all my past posts trying to find out my RPM problem (4200 Max) and speed issue (32 MPH on GPS ), It sprays up water pretty good when going 4200 wondering if this could be creating drag, the pic's stink. Do You think I should move it up 1 or 2 holes? I will try to get better pics over the weekend. Thanks

I hear what Ferm's sayin' about stayin' in touch in a rough sea...but I like mine to be about 1/2" above the water on plane...least amount of drag, better fuel economy and top end...as long as YOUR BOAT will handle it that high...some will "blow out" in a turn...whether you like 'em like mine or Ferm's, sounds like yours can go up some...I think you'll like the result...

BTW...do you know how to raise/lower the motor using the trailer???

THEFERMANATOR · #5 10-12-2011, 07:59 PM

Quote:

Originally Posted by reelapeelin

I hear what Ferm's sayin' about stayin' in touch in a rough sea...but I like mine to be about 1/2" above the water on plane...least amount of drag, better fuel economy and top end...as long as YOUR BOAT will handle it that high...some will "blow out" in a turn...whether you like 'em like mine or Ferm's, sounds like yours can go up some...I think you'll like the result...

BTW...do you know how to raise/lower the motor using the trailer???

This works good on MERCS and YAMAHAS, but I have found it to result in overheating for OMC's. OMC's really need to be level with the bottom of the hull on the older ones as the water pick-ups sit pretty high. And if it is a SUZUKI you MUST have it mounted so teh cavitation plate is just below the surface or else you will FRY the engine as they use dual pick-ups(one on the side of the foot and the other is underneath the cavitation plate).

reelapeelin · #6 10-13-2011, 12:14 PM

Quote:

Originally Posted by THEFERMANATOR

This works good on MERCS and YAMAHAS, but I have found it to result in overheating for OMC's. OMC's really need to be level with the bottom of the hull on the older ones as the water pick-ups sit pretty high. And if it is a SUZUKI you MUST have it mounted so teh cavitation plate is just below the surface or else you will FRY the engine as they use dual pick-ups(one on the side of the foot and the other is underneath the cavitation plate).

Sounds like RB has his Zukey in the right place then...all this time, I'm sure he does...

I tried droppin' the Johnson...one notch, then two til I ran outta notches...felt like the foot was draggin' bottom...LOL!!...still ran hot, so in my case, it's something else...Dr Spare will get the patient up and runnin'...I goin down to his clinic Sun...and he'll see us 1st thang Mon...

randlemanboater · #7 10-12-2011, 06:05 PM

I have seen before that if you put a straight edge on the very bottom of your hull and extend it out to the cav plate on the motor you can determine if your motor height is correct.

I think the formula used is for every 12 inches the front of the motor is away from the transom, move the cav plate up one inch from level with the bottom.

Of course you have to get the hull bottom level and the motor straight up and down for this.

I have mine mounted with the cav plate even with the hull bottom, a little low, but it never breaks the prop loose no matter what.