DHadley, could you look at the pics of my motor height??

[ddbyrd3]

In an effort to optimize my performance, I have been reading alot on motor height to transom depth, etc.<br /><br />I have attached pics of my motor / transom combination, I have never changed the factory location so any ideas would be appreciated....<br /><br />

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[ddbyrd3]

Re: DHadley, could you look at the pics of my motor height??

Sorry DHadley, its a 140hp Johnny.... The boat is a 19' Glastron Galaxie...<br /><br />

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[ddbyrd3]

Re: DHadley, could you look at the pics of my motor height??

Would it be worth going up one hole?????

 

[reeldutch]

Re: DHadley, could you look at the pics of my motor height??

try it it cant hurd anything.

 

[ddbyrd3]

Re: DHadley, could you look at the pics of my motor height??

Any thoughts on the motor position?????

 

[Dhadley]

Re: DHadley, could you look at the pics of my motor height??

Motor height (X dimension) on any given rig has a lot to do with the type and condition of the prop and how it interacts with the hull. It looks like youre using an SSTII which is in fair shape. I would certianly not be afraid to test at a higher X dimension. I wouldnt think that youd lose water pressure even if you went to the top hole.<br /><br />We might not be surprised if that prop started venting in tight turns at the 3rd hole up but water pressure shouldnt be a problem. I'd be willing to bet a 3 blade Turbo would hook up even if the motor was all the way up.<br /><br />The bottom line is, I'd record all the numbers and figure the slip then test one hole up at a time. With that prop. Remember -- one change at a time.

 

[ddbyrd3]

Re: DHadley, could you look at the pics of my motor height??

Thanks DHadley, i need to take it out in its current condition to verify changes I made last week, once I do that and everything checks out OK, I will raise the motor 1 hole...<br /><br />When you reference a 3 blade Turbo prop, whos prop is that, or is Turbo what I can use to do a search???<br /><br />When you say record the numbers and figure the slip, what exactly are you refering to????<br /><br />As always thanks for your expertise.....

 

[Dhadley]

Re: DHadley, could you look at the pics of my motor height??

If youll post your top rpm, accurate speed and pitch of the prop we can determine slip percentages. From that we determine how to reduce that % to gain efficiency.<br /><br />Turbo is a brand of prop. If youre thinking of getting a new prop you might consider a Turbo or perhaps a Stiletto. With a conventional bottom design and no jackplate a Stiletto may well suit your needs. The Turbo is a bit more expensive but has more technology built in.

 

[ddbyrd3]

Re: DHadley, could you look at the pics of my motor height??

I will take her out and document performance numbers and post ASAP.....

 

[ddbyrd3]

Re: DHadley, could you look at the pics of my motor height??

I will try and make this as short as possible:<br />I took her out today, and she ran great!!!!! Well kind of..<br /><br />One of the changes I made last week was on my tach setting, The teleflex instructions said to set the tach to 6P... I removed my flywheel and counted the # of poles and I have 4 large pick ups on each side, and 2 small pick ups on each end. I was told that it is considered a 4 pole stator and should set my tach to 4P...<br /><br />Upon my test run tonight (with the tach set on 4P) I ran 7000+ RPM, at 40MPH in semi rough conditions, no trim...<br /><br />I reset my tach to the original 6P position and ran the typical 4800RPM at 40MPH, same conditions.<br /><br />I verified my timing at 4800 RPM running across the lake, I saw 26*. (That was kinda nerve racking)<br /><br />I am running a 13x19 SST 3 blade prop, I also marked it to see if maybe the hub is slipping, I will check that tomorrow.<br /><br />The motor seemed to plane faster, could just be me, I did change the head gaskets to the standard type, I need to re-verify my compression numbers, and I installed new power packs. <br /><br />I ran with my engine cover off at WOT .(checking to see if I had a possible exhaust leak)and the RPM / performance DID NOT change, I also pushed in the electric primer switch (key) and also no effect to RPM / Performance...<br /><br />So there is my info from my test, I cant imagine I am running at 7k RPM, my ear says it isnt running 7k, it definatly sounds like it has more to offer......

 

[ddbyrd3]

Re: DHadley, could you look at the pics of my motor height??

After reading DHadleys post, I think going up 1 hole may not be a bad idea.. <br /><br />How many RPM can I expect, and would one of those hyrdofoil deals work to assist in anticavatation?

 

[Dhadley]

Re: DHadley, could you look at the pics of my motor height??

I think we need to verify the tach and the motors health. You should be getting more rpm than 4800 with that prop even where its at. The idle stop screw looks like its screwed in quite a ways. Lets take compression and see where we're at.<br /><br />Dont worry about a fin at this point. maybe later when you gain a bunch of X dimension. Lets do a compression test first.

 

[ddbyrd3]

Re: DHadley, could you look at the pics of my motor height??

I did a compression test, just prior to replacing the head gaskets, all 4 cylinders were 109 - 114 respectively. I changed the head gaskets because I thought (just maybe) the engine builder used "low compression" head gaskets.<br /><br />The head gaskets I removed were red in color and said "use on 115 - 135hp engines" But I replaced them with the standard head gasket last week. <br /><br />But I can re-check the compression again.<br /><br />A quick overview: I have great spark on all 4, new coils and wires, new power packs, I just rebuilt the carbs (OEM kits) rebuilt fuel pump, verified timing, all new fuel line and primer ball, pumps up hard and stays hard.

 

[Dhadley]

Re: DHadley, could you look at the pics of my motor height??

Its usually not a good sign when the idle stop screw has to be screwed in that far. And those numbers are a tad low for what we're used to seeing but that could be a lot of things. Are you sure the carb butterflies are going to horizontal with the throttle wide open?

 

[ddbyrd3]

Re: DHadley, could you look at the pics of my motor height??

Yes, I verified that as well I am getting full throttle... The timing at idle is 5*... Is that OK??

 

[Dhadley]

Re: DHadley, could you look at the pics of my motor height??

We dont worry too much about the actual timing number at idle. It depends on how much backpressure any given set up produces. I'd assume that with the motor mounted all the way down and a fairly deep V your motor has quite a bit. As you raise the motor on the transom youll notice a slight increase in idle. The extreme would be running the motor on the hose at home. Theres no backpressure at all. Thats why they idle higher and rev easier.<br /><br />Have you done a de-carb lately?

 

[ddbyrd3]

Re: DHadley, could you look at the pics of my motor height??

I have never done a decarb.. The motor was rebuilt in 01, and since the rebuild it has never performed like it did prior to blowing up....

 

[ddbyrd3]

Re: DHadley, could you look at the pics of my motor height??

Here are some pics of my # 1 & 3 cylinder.. Do they require de carbing??<br /><br />

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[Dhadley]

Re: DHadley, could you look at the pics of my motor height??

I'd change the deflectors for sure -- I'm sure you did when the head gaskets were changed. I'd do a decarb if its never been done. If the rings are starting to stick itll sure help.<br /><br />What did the motor turn before the rebuild?

 

[ddbyrd3]

Re: DHadley, could you look at the pics of my motor height??

Prior to the rebuild and my old gauges. It pulled 6000 RPM at 50+ MPH.. And it sounded like it was 6k and felt like 50+....<br /><br />Here is a vaiable I failed to mention, I have changed ALL my gauges to Teleflex Vector series gauges... On my tach, I didnt use the factory wire that goes from the terminal post (grey/yellow) to the tach, I replaced it with a new grey wire and ran it thru the loom to the tach from the terminal post (gray/yellow)<br /><br />I dont remember the reason I did that, but I remember doing it... I installed the gauges just after the motor was rebuilt in "01"<br /><br />I have a can of decarbonizer.... I will do that tonight....... is 1 can enough???