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Tuchop
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Posted: April 25 2006,10:29 pm |
Post # 3 |
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W.W. - I had a 1996 Reinell Rampage w/350 c.i. and an alpha drive and found that I had to run a 19 pitch. I would get about 5.5-6hrs of skiiing out of about than 14 gals of gas. This was 3 guys on a day trip that was done several times a summer to Saguaro. Hope it helps.
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GoFastRacer
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Posted: April 26 2006,6:54 am |
Post # 4 |
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If your HEI is bone stock, an aftermarket coil and module and a good set of insulated solid core wires is a must. Your total is low, you should have 22 degrees in the distributer and 36 total all in by 2500-2800(do you have vacuum advance??)even 38 if your compression can take it, it will start very easy and run smoothe!. This will make a difference in your plug reading, no matter how much you lean it out, without a good ignition and proper timing you'll never burn the gas efficiently and the plugs will always show black!... As far as the prop goes CE is right, you should be just about running out of motor at the limiter, if you can't reach it the prop is too big and vice versa. But at the same time if you're close a different pitch may not help, efficiency is the key and and that can make a huge difference in mileage, not to mention a lot nicer to drive, that's where the prop guys come in, stock props are stock props all they do is move the boat. When I built my ski boat to pull the kids, I had my prop worked on 3 times before I got it right, and I went from using almost 20gals a day to less than 20gals for the whole weekend, and that was with a big block!... Something to think about!..
Edited by GoFastRacer on April 26 2006,6:55 am
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weldwade
Scorpio
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Tucson Az
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Posted: April 26 2006,7:50 am |
Post # 6 |
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| Quote (GoFastRacer @ April 26 2006,6:54 am) | | If your HEI is bone stock, an aftermarket coil and module and a good set of insulated solid core wires is a must. Your total is low, you should have 22 degrees in the distributer and 36 total all in by 2500-2800(do you have vacuum advance??)even 38 if your compression can take it, it will start very easy and run smoothe!. This will make a difference in your plug reading, no matter how much you lean it out, without a good ignition and proper timing you'll never burn the gas efficiently and the plugs will always show black!... As far as the prop goes CE is right, you should be just about running out of motor at the limiter, if you can't reach it the prop is too big and vice versa. But at the same time if you're close a different pitch may not help, efficiency is the key and and that can make a huge difference in mileage, not to mention a lot nicer to drive, that's where the prop guys come in, stock props are stock props all they do is move the boat. When I built my ski boat to pull the kids, I had my prop worked on 3 times before I got it right, and I went from using almost 20gals a day to less than 20gals for the whole weekend, and that was with a big block!... Something to think about!.. |
I need to make some time to get down to Don's Hot Rod to get a coil and module. I was worried about putting too much advance in the dist before I tested it out on the water. I'm going to bump the initial timing up to 12 from 10 and get some different advance weights and springs to get me to 38 total. I don’t have an adjustable vacuum advance should I get that also?
Keep your GUNS!  |
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LASINC
Virgo
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Yorba Linda, CA
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Posted: April 26 2006,11:33 am |
Post # 7 |
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Since I'm absorbing all this wealth of knowledge through all of you, it has got me thinking.
On a 496ho with 26 pitch prop running 4800 rpm at wot what can I do to maximize it?  Should I go with a bigger prop and a better wires or.........
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| Member # 1456 | Joined: 5-24-2005 | |
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Tuchop
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Posted: April 26 2006,6:23 pm |
Post # 11 |
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| Quote (LASINC @ April 26 2006,11:33 am) | Since I'm absorbing all this wealth of knowledge through all of you, it has got me thinking.
On a 496ho with 26 pitch prop running 4800 rpm at wot what can I do to maximize it? Should I go with a bigger prop and a better wires or......... |
I don't now about the 496 s but the small blocks were rev limited at about 4800rpm. Check the owners manual. Sounds like yours is pretty well hooked up. 
Edited by Tuchop on April 26 2006,6:25 pm
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GoFastRacer
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Posted: April 27 2006,5:45 am |
Post # 12 |
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| Quote (weldwade @ April 26 2006,7:50 am) | | I need to make some time to get down to Don's Hot Rod to get a coil and module. I was worried about putting too much advance in the dist before I tested it out on the water. I'm going to bump the initial timing up to 12 from 10 and get some different advance weights and springs to get me to 38 total. I don’t have an adjustable vacuum advance should I get that also? |
When you put the curve kit in make sure you put the little bushing in to give you more initial, at 38 you should have 16 initial!.. If you don't have vacuum advance don't worry about it, I've tried it and it didn't make any difference!..
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GoFastRacer
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Posted: April 27 2006,6:02 am |
Post # 13 |
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| Quote (LASINC @ April 26 2006,11:33 am) | Since I'm absorbing all this wealth of knowledge through all of you, it has got me thinking. Â
On a 496ho with 26 pitch prop running 4800 rpm at wot what can I do to maximize it? Â Â Should I go with a bigger prop and a better wires or......... |
You can always benefit from an ignition upgrade!. If you have a rev limiter check to see what it's set at, if it's at 4800 and the boat seem to work ok a bigger prop may just pull the motor down, usually they come with the right combination but you can probably increase it's efficiency and not change the way the motor runs!..
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GoFastRacer
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Posted: April 27 2006,7:33 am |
Post # 15 |
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Factory limiters are smoothe you don't even notice them, it just seems like you reached maximum rpm!.. Your thermostat may be sticking open or it's not what it says it is, I always check a new one before put it in, be surprised at how many are not accurate!.. But I wouldn't worry about it as long as the oil is up to temp, that's the important part!..
Edited by GoFastRacer on April 27 2006,7:34 am
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GoFastRacer
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Posted: April 27 2006,8:28 am |
Post # 17 |
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| Quote (weldwade @ April 27 2006,7:42 am) | | Quote (GoFastRacer @ April 27 2006,7:33 am) | | Factory limiters are smoothe you don't even notice them, it just seems like you reached maximum rpm!.. Your thermostat may be sticking open or it's not what it says it is, I always check a new one before put it in, be surprised at how many are not accurate!.. But I wouldn't worry about it as long as the oil is up to temp, that's the important part!.. |
Looks like I need to buy an oil temp gauge. I usually check thermostats before I install them but I focked up this time, too many irons in the fire. |
Ain't that the way it goes, first time you don't check it you get a bad one!..  
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GlassMan
Pisces
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Posted: April 27 2006,11:51 am |
Post # 19 |
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| Quote (weldwade @ April 25 2006,3:04 pm) | | Art, can you give me some ideas for increasing gas mileage on my boat. I installed an HEI over the winter with new wires and plugs. I did not install a performance module in it but I did check total advance and it is 32 deg at 2500. I re jetted the carb but I can lean it out a little more, plugs are still a little black. What I would like is to be able to run around all day on one tank and fill it up in the evening with gas that I bring with me so I dont have to pay the steep price at the marina. I ordered a 14.25 21 pitch prop, I have a 14.25 19 pitch on it now, I tried a 17 pitch and I cant even get the boat to plane without overpowering it so I think the 21 wont be too much. Will the better bite of the 21 pitch help with part throttle crusing fuel mileage because that's where I pull the kids at? |
WW, for what it's worth...I emailed a buddy who has the same boat, bit newer, he is running a 14 1/4, 21 and says that he used his GPS data to figure out he was getting 3 MPG on average.
I don't know if that works for you or not, but I wish I got that.
It's a fact of Life:
After Monday and Tuesday, even the Calendar says : WTF .......
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Tuchop
Gemini
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Posted: April 27 2006,2:08 pm |
Post # 21 |
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| Quote (weldwade @ April 27 2006,8:38 am) | | Art, where is the rev limiter? 4.3 OMC. I’m guessing it’s electronic to the coil somehow? I'm curious. |
A buddy of mine had a 1980s something Baja (I think) w/ an OMC and it did not have a rev limiter (he could blow it up if tried).
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GoFastRacer
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Posted: April 27 2006,9:18 pm |
Post # 24 |
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| Quote (weldwade @ April 27 2006,8:38 am) | | Art, where is the rev limiter? 4.3 OMC. I’m guessing it’s electronic to the coil somehow? I'm curious. |
If you have one it will be linked to the distributer somewhere, with an HEI it has to be close to it!.. Easy way to tell is give it a quick rev, if it goes beyond 5500-6000 you don't have one!..
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GoFastRacer
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Posted: April 27 2006,9:41 pm |
Post # 25 |
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| Quote (stingray @ April 27 2006,7:17 pm) | | Now the second I say that someone will correct me  but rough. so maybe have yours tweeked to a 25. |
Well it took more than a second!. But like I said when you're close(which he is)reworking the prop can be more beneficial, even if you change to one that will let you pull the rpm's that don't mean that it is "efficient", that's the difference between a $200 prop versus an $800 prop!.. As an example, last year I had mine reworked because I was blowing the prop away coming out of a turn and that sucked big time, so I had a slight cup put on it, now it flat out hooks up and goes and at the same time it gave some tail lift and freed up the boat and I got 11 more mile an hour out of it and only a 100 more rpm, it's all about "efficiency"!.. Best $100 I spent in a long time!..
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