Prop Questions
02-10-2007, 09:24 AM
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Prop Questions
Hi guys, I am new to your forum but not OSO. I own a 1988 Baja Force 265 that I repowered with an HP500. I Run about 63 on GPS. I just bought a supercharger for it..(250) and I am trying to get an idea of how it will be propped. I have done some calculations and have come up with what I feel is alot of slippage to run 63mph.. I run a labbed Bravo 1 24*. I figure at 5100-5200 rpm my slip must be well over 20%..is that high?...I am guessing I will need to go to a 28* when I am finished installing the 250...I wonder if I need a different type of Prop? 5 blade?..I do not want a 3 blade because I hate the way the handle..btw..it will be a B&M 250 with twin holley 750's..making about 4.6psi boost..looking at 650hp give or take..I did some work on my HP500 3 years ago and it is actually is a 509 now..the cam train is all stock HP500 but I worked the heads a little bit..also I will be removing the Gil exhaust in favor of CMI uni-top. Thanks for any input..sorry for the book
Last edited by Bajapred; 02-10-2007 at 10:12 AM. Reason: forgot rpm info
02-10-2007, 07:19 PM
#2
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OK,
Your slip is in the 16% range. Three blade props typically run pretty good on your boat style. However, knowing that you like the handling of the 4 blade propelles, trying a REV 4 propeller isn't a bad idea. These props are only available to 25 pitch. Untill we know this won't hold the R's down as needed, I'd keep them in mind.
B
Your slip is in the 16% range. Three blade props typically run pretty good on your boat style. However, knowing that you like the handling of the 4 blade propelles, trying a REV 4 propeller isn't a bad idea. These props are only available to 25 pitch. Untill we know this won't hold the R's down as needed, I'd keep them in mind.
B
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Brett Anderson / BBLADES Professional Propellers
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Brett Anderson / BBLADES Professional Propellers
920-295-4435 http://www.bblades.com/
[email protected]
02-11-2007, 09:16 PM
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If I calculate 5200 rpm, 1.5 ratio & 24 P Bravo1 @ 62mph..I get .21 slip...am I doing something wrong here? How can I lower my slip..is that even posible? I guess I will need to wait until my blower is installed to see what prop I need but can anyone take their best guess to get me close...the engine guys tell me to expect 4* with this blower..is this right? that would put me at a 28p..
02-12-2007, 10:49 AM
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A 24p Bravo 1 probably measures closer to 23".
Labbed props typically slip more than stock props, hence your high slip numbers.
After your mods, test with a stock 26p and stock 28p B1.
Then have BBlades dial it in for you...
Labbed props typically slip more than stock props, hence your high slip numbers.
After your mods, test with a stock 26p and stock 28p B1.
Then have BBlades dial it in for you...
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