Reply With Quoteusually most 5.7 or 350 max is 5000,try a 23 pitch prop, that should get you with in range, good luck
later stan
Anyone know the WOT rpm for a 5.7 350? I'm spinnin' 6,000 rpm at WOT with a 15R17 prop.
usually most 5.7 or 350 max is 5000,try a 23 pitch prop, that should get you with in range, good luck
later stan
I would suggest jumping to a 21, not a 23. A 23 is a lot of prop to turn for a 350. Usually, every 2 inches of pitch drops your rpm by about 400. So, an 800 rpm drop would be a 21. (5200rpm) A larger diameter will also reduce the RPMs, so if your boat has a 13.75" on it, and you go to a 14.25, it should put you right around 5000.
There are no definates on which prop will turn 5000 on your boat, no matter what it will be trial and error.
[ August 11, 2003, 06:33 PM: Message edited by: Snorider ]
i have a 350 mag (250 prpshft hp)and turn a 3 blade mirage 21p to 4850 rpm.prop has been tuned thinner blades and cupped
So what do you guys think? Right now I have a 15' diameter 17" pitch. I'm thinking I'll try the 21" pitch first but should I mess with the diameter too, or just the pitch?
going to a 21 will only get ya bout 5100 to 5200 still a little on the high side,gettn ready to run a 23 with my 350, i know several folks runn 24's on a 350 w/alpha's
Good luck
Later stan
Hey Stan, any input on the diameter?, or should I stay with the 15"? I'm turning a Volvo Penta 290 with a pretty stock 5.7.
So right now I think I'm looking at a 15/21 and maybe a 15/23 based on what you're saying. I've actually had a couple shops recommend a 19 but they probably want to sell me a couple props huh?
Ordered a 15/21 and I'll be picking it up tomorrow. I'll letcha know what happens.
most companys say for every 2 inches is roughly 400 rpm.I was runn a 14 1/4x19 @5300 now it is 4850 with a 14 3/4. i have not try a 15" wheel yet but soon hope to. in your case i would stay with a 15" wheel and change pitch good luck and keep up informed
later stan
Just figured out I gotta short shaft. . . . Gotta order another prop!!
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