SoCal Jet Boats
Tech Talk => Projects => Topic started by: mstrader77 on May 07, 2014, 09:21:22 PM
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Here are a couple of pics of my project I recently completed. The first launch was last Friday. It's a 1973 Fiberform Malibu. It has a 455 Olds and a Berkeley JC Pump with an A2 impeller. 61 mph @ 4500 rpm on 87 pump gas and conservative timing. Not pretty, but will make a good river boat for my family and I.
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It aint about being pretty its about being wet good for you man
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being pretty is one thing... being functional is another. you're in the water and thats all that matters. congrats!
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Clean olds! What all is done internally?
Sent with my Fingers
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I tore apart the olds because of lifter noise. When I got inside, everything looked great. It had .020 L2323 pistons, the bearings looked new, and it had been balanced. A couple of bores had some slight pitting in them but otherwise had no taper or wear. I honed them and installed new rings. I also installed a new oil pump and timing set. I used a 460 seal for the rear main. This engine has no oil mods, but I figured it lasted the previous owner 25 years with an A impeller, so it would last for me. The cam is an H-302-C Crane. I had to call Crane for the specs. The ones I remember are 232 duration with .496 lift on both intake & exhaust. The heads are KA with dual springs, but the rest is stock. The heads looked good so I left them as is. Intake is a O4B Edelbrock with an Edelbrock 750 1410 carb. The distributor is an Accel 301003 Dual Point that I converted to pointless with a Crane XR-I module. Timing is set at 30 degrees all in by 2200 rpm.
I rebuilt the pump because the impeller was badly pitted and had cracks. This gave me the opportunity to go to the A2 impeller. I chose this trim to keep the rpm's down at a safe level and give me a comfortable cruising speed. I get about 30 mph @ 2900 rpm. This is just out of the secondaries and seems to give pretty good economy.
The 61 mph was the GPS average of two passes. Indicated it showed 63-64. It was purposing a little on the top end with the trim tabs all the way up (I wanted to see how the boat handled without them). I adjusted them down a bit and the purposing went away, but the boat feels like the transom is being lifted a touch too much(it feels a little loose on the top end now). I'll keep playing with it until I find the sweet spot. Anyone have a place diverter they want to donate? ;)
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Looks good to me too and its all about having fun and the best part is you don't have to worry about another boat looking like it next to ya. That's one thing I love about my Horizon, aint to many around...Good luck and have fun!
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I took it out last night and the motor seems to be breaking in nicely. It's pulling just over 4600 rpm with the A2. I set the trim tabs level with the bottom of the boat and it seems to be working out well. My youngest and oldest boy are in the picture. My middle son is just out of the picture. My wife was driving. This was the second time she has driven a boat. She is catching on quick.
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Thats freakin priceless bro!! Keep up the fun!! :-)
sent from my smarter than me phone
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Awesome!
my wife is too scared to drive mine
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I went out to the river today. My wife took a short video of me. This is all out, just shy of 4700 rpm. My two way gps average is 63 mph. A couple of weeks ago, a guy raced me with a "70-75 mph" boat...I pulled away from him by a couple of mph. Gotta love that! He did say his other boat would have taken me. ::)
https://www.youtube.com/watch?v=pV2sS8zkm-c (https://www.youtube.com/watch?v=pV2sS8zkm-c)
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Looks like a Nice place to jet boat! Looks like you got a great boat!
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No kidding that boat sweet
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Finally got another video up on youtube. Best speed running single in cool weather has been 67 mph on the gps turning a touch over 4800 rpm. Over the summer I put about 50-60 hours on it with no problems. https://www.youtube.com/watch?v=o8eDqdOp1eY (https://www.youtube.com/watch?v=o8eDqdOp1eY)
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Go Oldsmobile!! :thumbup: :thumbup:
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Finally got another video up on youtube. Best speed running single in cool weather has been 67 mph on the gps turning a touch over 4800 rpm. Over the summer I put about 50-60 hours on it with no problems. https://www.youtube.com/watch?v=o8eDqdOp1eY (https://www.youtube.com/watch?v=o8eDqdOp1eY)
that's awesome. I'm in va and to dam cold to get wet. But great job. I won't have another jet boat like mine sitting beside me either. Check it out
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Can't beat the sound of an olds. Those are bitchin hulls my brothers got one with an outboard on it. Where's that river at? Looks like a bunch of fun
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It's the Santiam river near Salem, Oregon. I do most of my running on the Santiam and the Willamette rivers. The videos were taken this summer. Right now, it's about 28 degrees outside. Can't wait for spring to come.
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I am sticking with an olds couldent sell the head so on the motor they went
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Boat looks good
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