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Prop choice for a 25hp 4-stroke Nissan
BAY2SAV	#1  Posted on 07/07/08 - 7:37 AM
Member Personal Page Posts: 93 Comments: 0 Joined: 06/24/07	I've been wondering how to squeeze an extra mph or so out of my 2002 Nissan 25hp 4 stroke on my 13 Sport. The max rpm for this engine is 5500 rpm and currently has an aluminum 3 blade 9.6X13 prop. The gear ratio is 1.92. I've been looking at a 10X14 4 blade stainless steel prop. I don't need to worry about the hole shot capability - just want to increase my cruising speed. I don't have a tach currently installed. Any suggestions would be appreciated. Thanks, Denny 1972 13' Sport Smirked Hull and Blue Interior Nissan 25hp 4-stroke
kamie	#2  Posted on 07/07/08 - 5:24 PM
Member Personal Page Project Albums Posts: 2975 Comments: 3 Joined: 11/04/05	Denny, Unless you know where you are, you don't know if you have improved anything. Without a Tach you don't know how efficiently the engine is spinning the current prop. Do you have plans to add a tach to your current setup?
BAY2SAV	#3  Posted on 07/08/08 - 9:23 AM
Member Personal Page Posts: 93 Comments: 0 Joined: 06/24/07	Yes, I intend to install a tach to the boat - but probably not until later this year. I have to admit, I was looking for an easy way out - hoping someone would have the same boat/motor combo from which I could guage possible prop sizes and number of blades. I will go with the recommended procedure of using the tach, but it'll have to wait until later. Just alittle impatient that's all..... Denny 1972 13' Sport Smirked Hull and Blue Interior Nissan 25hp 4-stroke
Tom W Clark	#4  Posted on 07/08/08 - 11:10 AM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	A tachometer is inexpensive and very easy to install. Why wait? You can also buy a Tiny-Tach, less expensive still: http://www.tinytach.com/tinytach/inde.../index.php Edited by Tom W Clark on 07/08/08 - 11:12 AM
Tom W Clark	#5  Posted on 07/08/08 - 11:19 AM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	To answer question about the number of blades, I would stick with a three blade prop. Stiletto makes the Triad 3.0 which will fit the Tohatsu 25 four stroke. Propeller diameter is 10-1/8" x anything from 10" to 14". You will probably want a 12" or 13" pitch.
BAY2SAV	#6  Posted on 07/09/08 - 10:05 AM
Member Personal Page Posts: 93 Comments: 0 Joined: 06/24/07	Thanks Tom, I have a Faria Tach and a Faria depth meter that I plan to install on the console. Just have not gotten around to it. I plan to get all my electronics (bow light and stern light rewire, tach and depth meter) done when I pull the boat next time. I have an aftermarket stern light base that was mounted in the starboard rear that is pulling thru that I also need to deal with. Then I'll worry about the prop...... Thanks, Denny 1972 13' Sport Smirked Hull and Blue Interior Nissan 25hp 4-stroke