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#11
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Join Date: Mar 2010
Location: Belleville, MI
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I have the exact same boat, 90 Scarab 21' with a 350 Mag. I see 53-55 mph (GPS) at 4800 RPM. I'm running a 21 degree Mirage prop. I doubt your hitting 62, but if you are, DON'T change a thing!
-Rob
-Rob
#12
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Join Date: Jun 2011
Location: Granbury Tx
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Thanks for all the replies..This is my first adventure with these power boats.. Now I have messed around with old hot rods for years. That is my thinking. If you are not turning the RPM's you think you should then something is wrong..A small block can take 5300 all day. I understand how to get that out of an rod but this boat thing I am still learning. The single plane in my opinion would give you mid to high range power..Now here we go again, I am thinking in terms of a rod..If I cannot increase rpm's on a boat that i cannot..I just thought I would throw it out there and see what everyone else thought..Thanks for all the replies.
#14
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Thanks for all the replies..This is my first adventure with these power boats.. Now I have messed around with old hot rods for years. That is my thinking. If you are not turning the RPM's you think you should then something is wrong..A small block can take 5300 all day. I understand how to get that out of an rod but this boat thing I am still learning. The single plane in my opinion would give you mid to high range power..Now here we go again, I am thinking in terms of a rod..If I cannot increase rpm's on a boat that i cannot..I just thought I would throw it out there and see what everyone else thought..Thanks for all the replies.
#15
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[QUOTE=khubard;3624191]a small block can take 5300 all day. no it can't. you are used to hot rods. run it up to 6500 and shift. this isn't a race car, it is a truck, loaded with bricks, pulling a horse trailer, uphill at 60 mph. what an engine will put up with for 10.5 seconds is astronomically more than what it will take for 30 minutes.
#16
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You could always put a alpha one ss drive on it that would help.
#17
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[QUOTE=dereknkathy;3624406]
In addition to the above post, your limited to the RPM range of your cam! Boats and cars are completely different. A good dual plane is good to 5500-6000 rpms. Your a LONG way from that rpm range!
a small block can take 5300 all day. no it can't. you are used to hot rods. run it up to 6500 and shift. this isn't a race car, it is a truck, loaded with bricks, pulling a horse trailer, uphill at 60 mph. what an engine will put up with for 10.5 seconds is astronomically more than what it will take for 30 minutes.