SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: Ironworker21 on September 19, 2012, 05:06:17 PM
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Well as it says I'm a new one, this is what I have....76' Eliminator bubble deck, delta V bottom I think,
BBF 460 with offy single carb tunnel, D3ve a2a heads, 600 cfm Holley, Berkeley 12jc pump/jet, stock rock grate.
So here is my ?....currently full pedal mash nets me 62mph on GPS at 5300 rpm, trimmed up with a slight chop, full rooster and 15 gallons gas, oh and 300 lbs of humans :), 2 of us.
For you experts out there, is there anything odd about those numbers or anything I could change up right away on the motor to make it a bit stronger running.
Oh and I did a compression check and it's sittin right around 8:1
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seems about rite ;)
but, for shits and giggles, can you explain to me how you get compression ratio from a compression test :screwy:
welcome to the site :thumbup: got any pics of the boat? we like pics
ralph
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I'm suprised you're getting the rpm you are with only a 600 on a tunnel ram (something sounds odd to me).
Depending on how much you want to invest I'd recommend getting a dual carb top for the tunnel and adding another 600 or get a Team G, Victor Jr type manifold and go to an 800-850 carb.
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Ralph, sorry bout that on the compression numbers, it was reading 135 lbs on averag. However, I just took the valve covers off tonight and I've got serious milky oil, so now i obviously have a blown head gasket, hopefully nothing more. Now I'm kinda lost.
Curious as to what my next step is
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just cause you have milky oil does not always mean you have a blown head gasket. that is a boat in water. just my 2 cents.
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For Crewchief, I was wondering the same thing. The list number is 6361, I cross referenced that and came out as a 600 vacuum secondaries. Called Paul over at High flow and somewhat confirmed that. He said with the way the motor is set up now, those kinda rpm's should be netting me around 70 mph. So I called Joe down at Precision Craft Marine and Joe Jr. Is gonna check out the pump and impeller.
Gonna change the oil and filter, then the head gaskets and I guess go from there.
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Oh and I'm still working on how to post pics. I bought it from jet crazy here on the forum, and I just checked and the original pics and add he posted are still up.
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If you have headers and water is getting to your headers at idle you will get water in your oil
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I also had similar milkshake caused by bad intake gasket leaking water in to lifter valley.
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...I have....76' Eliminator bubble deck, BBF 460 with offy single carb tunnel, D3ve a2a heads, 600 cfm Holley, Berkeley 12jc pump/jet, stock rock grate.
....currently full pedal mash nets me 62mph on GPS at 5300 rpm, ...with... 15 gallons gas, ...and 300 lbs of humans, 2 of us.
Called Paul over at High flow...He said with the way the motor is set up now, those kinda rpm's should be netting me around 70 mph.
Wow, I did not realize your top speed numbers were with two persons and 15 gallons of fuel! 63 mph under those circumstances is not bad at all with your current setup. :)
Remember I told you my boat does 85 mph gps? If I add a second person in the boat, its top speed drops to about about 77 mph. Therefore, you can imagine that if you were alone in your boat and had just 5 gallons of gas then 70 mph might be atttainable. And so 63 mph with two persons and 15 gallons is about right afterall.