Which props 21's or 23's
#1
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95 29 scarab twin 350 mags alpha 1's counter roating.. I bought the boat and it has 21's and it over revs alittle .. I think it should have 23's stock... What should i look for ? there is a set of cleavers on ebay.. Thanks
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I don't think cleavers would work well on that hull mirage+ would probably be your best choice for a 23 what rpms are you at with 21s and what props do you have now
Last edited by andyt25; 01-06-2011 at 06:56 PM.
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my 320efi engines were 5200-5400 with a rev limit at 5600 and with 21mirge + it was right around 5200 with not knowing what props you have makes it a little harder if you have regular mirage props the + would bring down your rpm a little . I'm sure if you check the scarab section they could help you with what works the best for your application
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Like was said you do not want cleavers, Mirage will probably work best on your boat. Are both tachs reading the same? There is a switch on the back of some of them for 4,6,8 cyd. Also what is the top speed on GPS and you outdrive gear ratio?
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I have same setup ....the 14 1/2 21 Quicksilver 48 13702A4021P ran about 5800+RPM. (Have one for sale is only reason I know p/n
)
I had the 21s cupped and dropped maybe 50-100 RPM.
I went to a 23 and top RPM about 5400....and 75mph
Tried a friends cleavers from an identical 28 with big blocks and.... way too much transom lift for me with the boat rear "walking" around corners. Same Hull different weight I assume...
Whats wrong with 5400RPM?
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I had the 21s cupped and dropped maybe 50-100 RPM.
I went to a 23 and top RPM about 5400....and 75mph
Tried a friends cleavers from an identical 28 with big blocks and.... way too much transom lift for me with the boat rear "walking" around corners. Same Hull different weight I assume...
Whats wrong with 5400RPM?
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Do the props you have now have (PVS)holes between the blades? Are they solid hub, or Flo-torq(plastic)? This will help us determine what you have now, and Yes, the Mirage Plus will drop the RPM over the regular Mirage, I agree, mirage(or plus) would be the best prop.
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Sorry I was away snowmobiling.. They say the 94 350 mags should run 44-4800 rpm.. the alpha 1 drives are supposed to be 1.50 ratio... the props are plain stainless with no holes and I think they have a solid hub.. I adjust the throttles so the tachs are the same and they are both close to the same position.. Thanks
#10
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Sorry I was away snowmobiling.. They say the 94 350 mags should run 44-4800 rpm.. the alpha 1 drives are supposed to be 1.50 ratio... the props are plain stainless with no holes and I think they have a solid hub.. I adjust the throttles so the tachs are the same and they are both close to the same position.. Thanks