Need some opinions on engine build
06-09-2010, 09:57 PM
#1
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Need some opinions on engine build
hey guys, i know most of you are running bigger boats with higher hp but i think you could maybe give som valuable input. I have a 1987 Concord Magnum II. Its 20 ft in length and weighs about 2500 lbs with a 260 hp merc 5.7L. it runs on GPS around 53-55 at 3000 ft above sea level with a 21p laser II. I am currently building another engine for it. It is a 97 vortec 350. I am using an edelbrock performer rpm intake, vortec heads, 9.72:1 forged flat top pistons, the original qjet, and switching to a roller cam and roller rockers. the rockers are 1.6 and the cam spec is 218 degrees at .500" on the intake side and 228 degrees at .500" on the exhaust side with 112 degrees lobe seperation. the cam actually gets .525 lift with the 1.6 rockers. was wondering what kind of power i can expect at 5000 rpm and maybe what kind of prop i should use to get max bow lift and top speed, also maybe an estimated speed.
06-09-2010, 10:38 PM
#2
06-09-2010, 10:53 PM
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06-10-2010, 07:16 PM
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Location: Essex Junction, Vermont
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06-10-2010, 07:33 PM
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Boy ...on one hand I mod everything so its hard to say that.
If you want to do it and you a a very capable guy well help you.
87 the size of your boat isnt the issue, its the viability of it as a performance platform - Oh you can get there...but its likely going to cost more than you think.
I would also say that you are likely to be frustrated with the end result and astonished by the price.
87Mag- alpha or Bravo? Whats you TOTAL budget?
If it were me - Id simply play with props and enjoy what is probably a really neat boat that runs well and doesn't give you any problems.
is this semi close to what you have?
http://www.concordboats.com/Magnum-II.html
Uncle Dave
If you want to do it and you a a very capable guy well help you.
87 the size of your boat isnt the issue, its the viability of it as a performance platform - Oh you can get there...but its likely going to cost more than you think.
I would also say that you are likely to be frustrated with the end result and astonished by the price.
87Mag- alpha or Bravo? Whats you TOTAL budget?
If it were me - Id simply play with props and enjoy what is probably a really neat boat that runs well and doesn't give you any problems.
is this semi close to what you have?
http://www.concordboats.com/Magnum-II.html
Uncle Dave
06-10-2010, 08:16 PM
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Join Date: Sep 2007
Location: Essex Junction, Vermont
Posts: 303
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Boy ...on one hand I mod everything so its hard to say that.
If you want to do it and you a a very capable guy well help you.
87 the size of your boat isnt the issue, its the viability of it as a performance platform - Oh you can get there...but its likely going to cost more than you think.
I would also say that you are likely to be frustrated with the end result and astonished by the price.
87Mag- alpha or Bravo? Whats you TOTAL budget?
If it were me - Id simply play with props and enjoy what is probably a really neat boat that runs well and doesn't give you any problems.
is this semi close to what you have?
http://www.concordboats.com/Magnum-II.html
Uncle Dave
If you want to do it and you a a very capable guy well help you.
87 the size of your boat isnt the issue, its the viability of it as a performance platform - Oh you can get there...but its likely going to cost more than you think.
I would also say that you are likely to be frustrated with the end result and astonished by the price.
87Mag- alpha or Bravo? Whats you TOTAL budget?
If it were me - Id simply play with props and enjoy what is probably a really neat boat that runs well and doesn't give you any problems.
is this semi close to what you have?
http://www.concordboats.com/Magnum-II.html
Uncle Dave
06-10-2010, 10:21 PM
#8
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Agree after working on my own little project I've spent about 2 k more than I thought and I'm still not quite done. http://www.offshoreonly.com/forums/d...3-eclipse.html
Hey...does your girl have a sister?
Uncle Dave
06-10-2010, 11:46 PM
#9
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Gold MemberThread Starter
Boy ...on one hand I mod everything so its hard to say that.
If you want to do it and you a a very capable guy well help you.
87 the size of your boat isnt the issue, its the viability of it as a performance platform - Oh you can get there...but its likely going to cost more than you think.
I would also say that you are likely to be frustrated with the end result and astonished by the price.
87Mag- alpha or Bravo? Whats you TOTAL budget?
If it were me - Id simply play with props and enjoy what is probably a really neat boat that runs well and doesn't give you any problems.
is this semi close to what you have?
http://www.concordboats.com/Magnum-II.html
Uncle Dave
If you want to do it and you a a very capable guy well help you.
87 the size of your boat isnt the issue, its the viability of it as a performance platform - Oh you can get there...but its likely going to cost more than you think.
I would also say that you are likely to be frustrated with the end result and astonished by the price.
87Mag- alpha or Bravo? Whats you TOTAL budget?
If it were me - Id simply play with props and enjoy what is probably a really neat boat that runs well and doesn't give you any problems.
is this semi close to what you have?
http://www.concordboats.com/Magnum-II.html
Uncle Dave
