Prop hell. 70 HP Evinrude 2 sroke 3cyl.

[Dhadley]

Re: Prop hell. 70 HP Evinrude 2 sroke 3cyl.

But is the tach set correctly???

 

[CaptainPuget]

Re: Prop hell. 70 HP Evinrude 2 sroke 3cyl.

Sounds to me like there is more than just a prop issue. Maybe the motor is mounted too low; the anti-ventilation plate should be even with or slightly above the hull line. If the boat is stern heavy and having trouble getting up under load a foil on the engine might help. Check the engine height and get it propped right first though.<br /><br />The prop that is killing the engine may be binding. What is the tach reading with it at WOT? You should be running around 6000rpm at WOT. (yes, check the tach settings and make sure it is set for 6 poles).

 

[Dhadley]

Re: Prop hell. 70 HP Evinrude 2 sroke 3cyl.

Lets just hang on until he can verify the tach setting. With the rev limiter set at 6700 (on a 1994 70 E/J) theres no way the motor can go to 7000. Since the tach reads 7000 that tells us there is an instrument problem. Without an accurate tach we're all just shooting in the dark. <br /><br />We have to start with the basics.

 

[ob]

Re: Prop hell. 70 HP Evinrude 2 sroke 3cyl.

Originally posted by walleyehed:<br /> No insult or bad intended, ob....hope ya didn't take it that way. Sometimes I have a hard time coming across as I wish to...

You come across clear as daylight Walleyed.I read you loud and clear and did not feel insulted in any way.<br /><br />I do however feel that Wile E Coyote has compounded his underprop issue by drilling vent holes. <br /><br />Also an engine model number would help to verify the exact year of engine in question.Wile E Coyote didn't seem sure of the year in his initial comments.

 

[BillP]

Re: Prop hell. 70 HP Evinrude 2 sroke 3cyl.

Like DHadley sez, the rev limiter shouldn't let it rev to 7000. My 70 rev limiter kicks in at 6600 as checked with a calibrated handheld tach. Something is out of wack.

 

[Wile E Coyote]

Re: Prop hell. 70 HP Evinrude 2 sroke 3cyl.

Thank you all for comments and advice so far. I will get engine no: make of tacho. I know when I installed it I set it up correctly for a 3 cylinder Evinrude. I took the old tacho and speedo out when I bought it as they were tatty and mounted on a scrap piece of wood next to the controls where they were difficult to see. I know I have said 7000 RPM, I did not mean that exactly. What it is is when it gets out of the hole, the revs climb quickly up to around the 7000 mark. I have never left the throttle wide open long enough to see exactly where the revs level off. I tap off as soon as I'm out. I know that if I'm playing around alone in the boat and open up for a short burst it goes above the 6500 quickly. Hence I can't say exactly as I would never run it for a long period WOT. I respect my outboard too much to try that. ob....if you think drilling vent holes could have compounded my problem, that could explain a few things....Thanks.I did that when I first bought the boat - before I took the motor in for major service etc. When I first bought it, there were lots of "little" things that needed attention. Cracked piping, leaking carb gaskets etc. etc. etc. Do the vent holes raise the RPM at all?

 

[Dhadley]

Re: Prop hell. 70 HP Evinrude 2 sroke 3cyl.

The vent holes should have no effect on rpm after the boat gets on plane, as long as they are done correctly. Yes, they do allow a bit more rpms on holeshot. The escaping exhaust (air bubbles) will "vent" each blade and allow it to slip some. Thus getting the motor into a higher rpm band quicker. If you are in doubt at all about the holes, simply plug them and test. Probably a good idea.<br /><br />Lets start with the basics which is to verify the tach. Since all our calculations will be based off of it, we need to start there.

 

[Wile E Coyote]

Re: Prop hell. 70 HP Evinrude 2 sroke 3cyl.

I feel like an idiot, I've just looked at my first post and see I've got my motor as +/- 1994.<br /><br />It's +/- 1984. 10 years out is all. Sorry all.

 

[Wile E Coyote]

Re: Prop hell. 70 HP Evinrude 2 sroke 3cyl.

I feel like an idiot, I've just looked at my first post and see I've got my motor as +/- 1994.<br /><br />It's +/- 1984. 10 years out is all. Sorry all.

 

[Dhadley]

Re: Prop hell. 70 HP Evinrude 2 sroke 3cyl.

That does make a difference. Those motors did not have a limiter. We still need to verify that its set on position 6.<br /><br />Good info -- thanks!

 

[Wile E Coyote]

Re: Prop hell. 70 HP Evinrude 2 sroke 3cyl.

Right, tacho is set up correctly, position six. Have been looking through all sorts to-day trying to find out more about the hull, Driver 440. Manufacturer's here (Fletcher) have closed down. Some say it's a 15' hull and others a 14' hull. It's quite a narrow hull with a long nose, quite a deep V. If I could post a pic, maybe it would help.

 

[Dhadley]

Re: Prop hell. 70 HP Evinrude 2 sroke 3cyl.

Yep, seen pics of those. In that configuration it does tend to go nose high on acceleration. <br /><br />Lets see if we can borrow a 3 blade 19" stainles steel prop and try that. It doesnt matter what brand (other than Ballistic) at this point. <br /><br />Lets test for top rpm to start. We're looking for a top rpm of 6000. We'll deal with the holeshot later. In fact it might not hurt to post in the outboard non-repair section to get NauticJohn's attention. His Smart Tabs may be of help here. If you can raise John get him to follow this thread so he knows where we're at now.

 

[LubeDude]

Re: Prop hell. 70 HP Evinrude 2 sroke 3cyl.

I have the Smart tabs on my Bass boat, which used to shoot for the ski when I took off. Now it comes out of the hole like a rocket, almost no bow lift. Just hammer it and youre off.

 

[walleyehed]

Re: Prop hell. 70 HP Evinrude 2 sroke 3cyl.

(other than Ballistic)

 

[Dhadley]

Re: Prop hell. 70 HP Evinrude 2 sroke 3cyl.

I got 2 of them in some stuff I bought from a place going out of business. Nice paperweights.

 

[ob]

Re: Prop hell. 70 HP Evinrude 2 sroke 3cyl.

Originally posted by Dhadley:<br /> I got 2 of them in some stuff I bought from a place going out of business. Nice paperweights.

This isn't my site ,but isn't product bashing discouraged,particularly if sold by iboats?<br />I have no experience one way or the other with Ballistic props or whether they are suitable for any application.Maybe they work well as props and paperweights.<br /><br />Anyway ,aside from that nitpicking item ,I agree that a 19" pitch would be a good starting point in determining final prop selection for the boat based on your rpms at WOT.6000 is a good target to shoot for.Do you happen to know what the dry weight of the boat is or the max hp rating?

 

[walleyehed]

Re: Prop hell. 70 HP Evinrude 2 sroke 3cyl.

No intention of bashing anything in particular because Iboats sells it....Attwood original Ballistics are not worth their weight in coal...Maybe the reason Attwood sold out the prop-line. MWC is in the process of making some refinements to these (New MWC production of the Ballistic) and as of December, the 4-blade was the only version they have been successfull with, and I do believe the entire line will be dropped eventually.<br />I've tested many of these props, ob, and so has DH, both of us have had simular, dissapointing results. That's not bashing, and yes, it is a bit of an "Inside" joke. No harm intended, but you can't lie about it when asked either, if someone is looking for a recommendation.

 

[ob]

Re: Prop hell. 70 HP Evinrude 2 sroke 3cyl.

I thought I might catch it a bit if I remarked about it.Oh well.I don't question anyones findings of the quality or lack of that Ballistic props may or may not have.Just didn't see the relevance in mentioning it.BTW if I was selling them in my store ,good or not,I wouldn't want anyone discouraging their use.Now if a guy was asking me what my opinion was of a product that I tought was sub-standard ,then I would give him my opinion.<br /><br />Since we're on the subject and a bit off topic ,I'd be interested in knowing the details of why you guys feel the way you do about Ballistic props.As I stated above ,I have no experience with them.Sounds as though the manufacturer must deal with numerous complaints.

 

[Dhadley]

Re: Prop hell. 70 HP Evinrude 2 sroke 3cyl.

The reason I said to try something other than a Ballistic is because they are so far off comapred to another brand. If he tries a 19 SST I or SST II or a Stiletto or a Turbo or a Quicksilver or just about any brand we will know how it compares to say a Stiletto or a Raker. The Ballistics just dont provide the bite and lift others do. <br /><br />Keep in mind we're also talking stock, as produced props here. I have heard that some folks have modified the Ballistics into decent props but that was a custom job and thats not the goal here. <br /><br />Its very similar to a Merc Chopper. They're an OK prop as produced but can be great props after someone like Mazco or DAH gets done with them.<br /><br />Actually I'm kinda bummed they arent that good. If they were better props the 2 I have would be worth more. Sure they're for sale but I'm not going to tell you they work as well as a Raker or Stiletto just to try and unload one. I'm not going to tell you a Pinto is as good as a Porsche.

 

[Wile E Coyote]

Re: Prop hell. 70 HP Evinrude 2 sroke 3cyl.

Been offered a SS 17" by a kind chap living in the same town as me. Do'nt know him, he just offered on another forum in the UK. I'll try that for a start. What are "Smart Tabs"? Excuse my ignorance. Thanks again so far.