SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: 79charger on June 24, 2009, 06:07:14 PM
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I have a 22 foot minidaycruiser with a harman marine 460 . It has a holley carb single feed , not sure what cfm it is but i wanted to get a edelbrock ? Which cfm should i get > the local speed shop said 600 but i am afraid of losing power. Is necessary to ge the marine version ? thanks
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i have the same motor in my spectra and i bought a 750 demon dp. i dont think that you need to go with a demon i only bought it because it was a friends and i got it on the cheap. i would run nothing smaller than a 750 dp, just run it really good like how you plan on driving that boat the most and check a plug, then jet accordingly. dont make the common mistake of over carbing a stock or almost stock motor.
The Beav
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What kind of rpm's are you spinning the anchor at ??? if you over carb , its the same as undercarb ( kinda )
650cfm straight from Holleys calculator ;)
Oh and if the engine is covered , then yes you need the "marine" carb
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my engine is not covered and My tach is bad , but i gps my self at 53 mph on glass
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850 dp and stay away from the edelbrock. go with a holley
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850 dp and stay away from the edelbrock. go with a holley
850 DP is what I'm running on my mostly stock 460. Works good for me.
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I have to agree with Ralph. The 460, with a mild to wild cam, likes nothing less than an 850 in my limited experience with the engine. 950 or better if your more on the WILD side of things. Just my opinion. (Ran a single 750 at Mead during the Moo break in, boat did NOT like it. worked good to me at the time, my first boat and experience with it, but found out later it LOVES the tunnel and 2 750's!)
Ray
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how do i identify what holley i have . cant find any numbers to cross reference
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Holley stamped the numbers on the forward side of the choke/air horn. If the air horn has been milled off you will have to get pics and we can give you an idea of what you have.
Single feed, would most likely make it a vacuum secondary (in most cases)... Could be as big as a 750, but the most common was the "list #1850" 600cfm version.
Post some pics of the carb (from front, from sides and from top).
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6oo cfm is ok But 850 in 460 is what you need. What is more important. Is how it is jetted . Or in edlebrok"s case meter rods. I have seized an engine because the carb was to small and not jetted properly. It is like oxygen to aks. Holley Vs edlbrok Holly is much more precise and much more tempermental. That why I have one in my jet. Edlbrok Does not hold tune as well but is less tempermental And very easy to take apart on the water. That is why I have one on my fishing boat. The difference between marine and non marine in both Is the breather tube that lets gas out of the bowls when flooded. The marine carb has a 90 on the tube so gas goes back in the carb and down in the manifold. Not all over valve covers and on a hot manifold. I hope this helps I don't know alot but this I do because I just got schooled in it . Thanks to montie