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Author Topic:   V-20 Performance
tomroe posted 07-06-2003 06:54 AM ET (US)   Profile for tomroe   Send Email to tomroe  
Well, after many headaches and problems things seem to be going better. After running my V-20 Outrage with a 1985 Evinrude 235 for about an hour today, nothing blew up, broke or busted. The motor is now mounted on the third hole from the top and I am running an OMC SST 14.75 x 19 3 blade prop. I also drained all the old gas and put in new. At first I was running at 4800 rpm at about 41 mph but as I continued on things improved to about 5200 rpms and 46 mph. Not the 50+ I would like, but better than the 0- that it has been the last few weeks. I'm not sure why the engine steadily increased rpms, but think it may be the new gas cleaning things out (?)

There is a marked difference in the ride and handling by raising the engine. In 35+ years of boating I never realized that engine height made a difference.

Two more questions; because I have the engine so high, should I be using a water pressure gauge to tell if I am getting enough water through the engine and will a high performance prop gain me that much more? Of course, any other comments and suggestions are welcome.

Anyway, I appreciate all the input from this forum, it has saved me much aggravation and kept my head out of the oven numerous times.

Sal DiMercurio posted 07-06-2003 11:34 AM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
Tom, the way things have gone for you in the last couple weeks, you would stick your head in the oven & find out it's electric.
Tom, it sounds like that omc 14.75 x 19 is to much prop for that engine.
I'd drop to a performance wheel Stiletto 14.25 x 17 s/s 3 blade which should allow the engine to spin up to 5,600 rpms & I really do feel it will get you very close to 50 mph if not more.
The reason I say that is, the Stiletto will make the boat ride much higher on the water [ lifting prop ] thus more air under the boat = more speed or less drag.
That 235 should be able to twist that 19 wheel close to 5,800 rpms but it could be a bit tired & the stock omc prop wont allow the boat to break free of the stuck to the water mode.
If it were me, i'd try a 14.25 x 17 Stiletto.
Tom, are you anywhere close to me?....I live 35 miles East of San Francisco & could loan you my 14.25 x 19 Stiletto just to see how the boat & engine like it.
My boat is at half moon bay for the next few weeks & when I run the ocean, I run the 19p Stiletto [ grabs better in rough water ], so it's on my rig right now but only takes a minute to pull off.
Sal
tomroe posted 07-06-2003 01:30 PM ET (US)     Profile for tomroe  Send Email to tomroe     
Sal,

Thanks for the offer but I am on the east coast.
We went out again today and I could only get 4900 rpms, it was fairly calm. Yesterday I got the 5200 rpms on about 1' chop. Never could have done that before I raised the engine. I think it improved the fishing too. So I assume the boat was riding higher on the chop than in the calm water. I'll try a Stiletto and report back.

tomroe posted 07-07-2003 08:41 AM ET (US)     Profile for tomroe  Send Email to tomroe     
After thinking about this for a while, I am not sure if the prop is the only problem. Here is the history.

Two years ago I replaced the Evinrude 175 that came with the boat with an Evinrude 235 (I bought a pair of them). Ran it that year and last spring, mounted all the way down with a OMC sst 14.5 x 19 prop. It ran at 5200 rpm's and 42-44 mph. Blew that up on July 3 last year. My son put on the other 235 we had and we were back in the water on the 4th. Ran that all last year with the same performance. I should add that the compression was very poor on both and the second engine was the poorer of the two.

So now, with an engine that has better compression, supposedly lower hours in freash water, rebuilt carbs, new fuel pump, all new fuel lines, filters, raised the engine two holes, I am getting the same performance that I got last year with an engine that the local mechanic said was a waste of time to put on the boat.

I am not sure if anyone can tell me if I am missing anything short of rebuilding the engine. For this year anyway I have to work with what I have. Hopefully next year I can move up at least into the 90's and will be looking for suggestions.

Sal DiMercurio posted 07-07-2003 01:03 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
Tom, 5,200 rpms is to low for that engine & your lugging it.
That engine needs to reach 6,000 rpms so it can breath right.
If it's at all possible, see if you can borrow a prop thats either 2 or 4 inches less pitch to allow her to run up to either 5,600 with the 2" less pitch or 6,000 with the 4" less pitch & see if she like it.
Those engine aren't high compression engines, off the top off my head I think 90 lbs psi is acceptable.
Sal
tomroe posted 07-07-2003 01:19 PM ET (US)     Profile for tomroe  Send Email to tomroe     
Sal,

I will try to borrow a prop. In trying to follow along here, the first number is prop diameter and the second number is pitch(?) If so, why is pitch listed in inches, I always figured the pitch to be in degrees. So I think I am looking for a 14.25 x 17 or 15 prop. Let me know if this is correct. If I remember correctly the compression was around 85-90 with one cylinder about 75. Last years engine was around 40 to start with.

Another valuable lesson learned, never touch the gray wire while the engine is running. The tach was intermittent and I was looking for the problem when my finger came in contact with the loose tach wire at the switch, man that hurts.

Bigshot posted 07-07-2003 01:24 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Easy tiger that engine redlines at 5500, it aint a looper.
Sal DiMercurio posted 07-07-2003 04:49 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
Oh Oh, I thought it was 6,000, thanks BS.
That changes the numbers a bit.
Going to a 17 will allow the engine 100 rpms over redline at 5,600.
I wouldn't worry to much about 100 rpms, just don't let her run there very long, like back the throttle down a hair.
Sal
tomroe posted 07-07-2003 05:08 PM ET (US)     Profile for tomroe  Send Email to tomroe     
OK, thanks. I'll try a 17.
tomroe posted 07-09-2003 10:04 AM ET (US)     Profile for tomroe  Send Email to tomroe     
Where do I buy a Stiletto prop for $249 ? It's been posted on the forum that that's what they cost. The lowest I can find is around $300

Thanks

Sal DiMercurio posted 07-09-2003 12:56 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
Try Aftermarket, they changed their e-mail address so when you talk with them, ask for the new one to get on their site.
Only thing with them is, you can't return the prop.
After Market.....1 800 349 2628
The are pretty knowledble on props, so tell him your application & what the engine turned [ rpms ] with your present prop.
Sal
tomroe posted 07-09-2003 01:45 PM ET (US)     Profile for tomroe  Send Email to tomroe     
Thanks

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