92 Mariah Z240 prop questions
Hey guys,
I have a 92 Mariah Z240 with the 454 and Bravo 1. I have been looking around and am trying to find out what the stock prop for this boat was? I just bought it the end of last season and it seems like it it under propped for what I do. Currently it has a 3 blade stainless Mirage 19 pitch on it. It gets on plane very very quickly but does not seem to work the engine at all on the mid to top end. I only use the boat for running the river and am looking for the best perfromance in the mid to top end. Any suggestions on what prop pitch and size would be best? Thanks for any insights!! |
Re: 92 Mariah Z240 prop questions
Hi lowerthanu and welcome to the club! Can you tell us what your RPM is at WOT? For overall usage, the prop's pitch and diameter should have you running between 4200 - 4600 RPM at WOT. The general rule of thumb is about a 200 RPM drop with every 1 inch increase in pitch. (ie. going from a 19P to a 21p will drop about 400RPM at WOT) WetWilly |
Re: 92 Mariah Z240 prop questions
Well I finally got the boat out this weekend to test it out, and with 6 people on board, I would rev to 5200 on the top end. Would you think a 21p would be in the bes of should I give a 23p a try?
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Re: 92 Mariah Z240 prop questions
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I find that while top speed is nice to have, solid mid-range acceleration really makes a difference in the feel & performance of your boat. |
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