Poper operating range for J/E V4 crossflows

[Dhadley]

Re: Poper operating range for J/E V4 crossflows

Turbo discontinued the Jr but there are still some around. I have 2 but the one for an OMC is only an 18 pitch. The other has a Merc hub and is the 20 pitch. I have a call in to Turbo to see if they have a 20 left for an OMC.

 

[bassman_n44]

Re: Poper operating range for J/E V4 crossflows

Thanks,that little puzzle had me confused. I even e-mailed them the same question and did not get a responce. The turbo Jr sounds like what I need,or I guess I'll try a 20 Raker.

 

[bassman_n44]

Re: Poper operating range for J/E V4 crossflows

Dhadley - If you could hook me up, I'd owe you one!

 

[bassman_n44]

Re: Poper operating range for J/E V4 crossflows

Walleyehed - Did I read in another forum that you have a dash mounted cylider head temp gauge hooked up on your x-flow. Hows that done? I'd like to do it for interest sakes and to keep an eye on things.

 

[Boilermaker]

Re: Poper operating range for J/E V4 crossflows

Originally posted by walleyehed:<br /> It's not magic...I have 7" of jackplate, water pick-ups plugged on top, and it takes a healthy, well tuned engine, and ya can't run it at 5300 and make it work...it's got to go up and back to get the R's up with the right prop.

Well kenny, as far as I can tell, my engine is still healthy>>>135psi compression across all cylinders (+ - 2psi) seems like good spark at cranking speed & pluggs look OK. Engine is up as high as it will work well & I trim out aprox 3/4 before lossing "bite". If I would prop for 5800 I would need a 13 pitch Stiletto>>>whats up with that???

 

[Dhadley]

Re: Poper operating range for J/E V4 crossflows

Bassman, they don't have any left. We'll have to see if we can find one - or a Raker.<br /><br />Boiler, what pitch is the Stiletto? 17?

 

[cougar1985]

Re: Poper operating range for J/E V4 crossflows

dhadley. maybe i should of posted my question here insted of under the other thread that you answered. ok i will go up a notch or two on the transom holes and see what happens.i can trim out fully and not break the water atall.also how do you tune the 90 to run at higher rpm,s?? though my boat has a older style hull than most it should still fly along as its not very big or too heavy(1000?)

 

[Dhadley]

Re: Poper operating range for J/E V4 crossflows

If its running correctly you'll have no trouble reachin 6000 rpm as far as the motor is concerned. What's holding it back is set up. If you can use 100% of the trim range without venting, you can usually go higher.

 

[cougar1985]

Re: Poper operating range for J/E V4 crossflows

thanks i will look into setting it up better.may take a week as im a little busy but i will post results when done.i will raise motor a notch at a time and will check the trim motor to make sure its functioning as it should.i bought the motor last year,and it basicly sat for 10 years prior to that so maybe a closer inspection of the trim hydralics is in order.other wise this motor is mint.

 

[Boilermaker]

Re: Poper operating range for J/E V4 crossflows

Dhadley>Yes, Stiletto 13.25 X 17

 

[walleyehed]

Re: Poper operating range for J/E V4 crossflows

Engine is up as high as it will work well & I trim out aprox 3/4 before lossing "bite". If I would prop for 5800 I would need a 13 pitch Stiletto>>>whats up with that???

Up as high as it will work with what prop??? how much set-back do you have???<br />Here's the problem I see...everyone is trying to "prop" for "X" RPM....we have to find the max efficiency with what we have before moving fwd...yes, it sometimes ends up with a prop change...maybe 2, but most people make the mistake of going down in pitch first, to get the RPM up.....obviously, that's not the best way to do it...

 

[walleyehed]

Re: Poper operating range for J/E V4 crossflows

Walleyehed - Did I read in another forum that you have a dash mounted cylider head temp gauge hooked up on your x-flow. Hows that done? I'd like to do it for interest sakes and to keep an eye on things.<br />

I don't know if those senders are still made, but they have a bracket they screw in to and the bracket has a head-bolt through it. You thread the sender down until it's snug against a cylinder cover bolt. I'm actually using water temp gauges and use them for reference only.

 

[Boilermaker]

Re: Poper operating range for J/E V4 crossflows

Kenny,<br />I raised the engine up 2 holes, but its mounted to the transome>>>I really didn't get as much RPM change from the x-dimension change as I would have thought....only 100-150 rpm increase, if that. <br />The prop is a Stiletto 13.25 x 17. This is an older modified-vee fiberglass run-a-bout...NOT a low/light bass boat<br /> The engine is a bone stock 1978 115hp Johnson & mounted directly to the transome. Would the Boysen Reeds help much???? I haven't had time to splash the boat this year yet....should be in this weekend....weather permitting! <br />From last year.... 5250RPM @ 38MPH GPS with engine trimmed out to just before venting.

 

[walleyehed]

Re: Poper operating range for J/E V4 crossflows

I have found (on my deep-V) that 1 hole was equal to 60-75RPM...exactly as you got.<br />I went a step farther and added a fixed position setback plate allowing 5" of setback and an extra 4" of vertical travel by adding more holes, higher.<br />I started with a 1977 115 johnny and moved up to a 1997 115 J..My 18ft'r weighs about 2400lbs, and ended up with an 18P Raker as being the prop that worked best for me, and I'm at 3600ft.<br />The reeds tend to give a very smooth Idle, an awsome mid-range, but very little on top until you get past about 6500RPM.<br />I now have a 1982 200 Evinrude on the back, and that extra 85HP gained me only about 7-9MPH, and at WOT, I have an hour and 15 min. of fuel on board....with the 115 I could go most of the weekend playing around.

 

[Boilermaker]

Re: Poper operating range for J/E V4 crossflows

WOW>>> How much difference did the 5" setback give in RPM's???<br /> I figure my boat is in the same weight range, and with it being a modified-vee...it should respond better then a deep vee. Of course the 1997 115 should produce a lot more power...and is that newer engine loop charged??? Kind of apples to oranges, correct???<br /><br />I would be happy to have a better hole shot & stay on plane at a lower RPM, so that when I'm in the ocean, I can conserve the fuel in my small main gas tank.<br />Of course getting the WOT RPM up to where you guys say I need to be, would be GREAT!!! If a 5" to 6" setback would help a lot, then I would buy one of those Hi-Jacker Plates I see advertised...that way I could fine tune the setup. I just figured that would be a waist on a big old boat like mine. There is a picture of the boat in this thread from last summer...<br /> http://forums.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=28;t=035948#000000 <br />Thanks for the help & sorry about HiJacking the thread.<br /> Jim