Fish nautique rpm questions

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   So I’m back haha dumb questions incoming put on your helmets… 

I have a 14x11 iirc prop boat hops up out of the hole doesn’t seem to struggle even with a load but seems like wide open only 23-2500rpm showing on the tach. (Could my tach be broken?)

To me seems like that’s low, 

Whats a pcm 351 suppose to turn wot 

How do I check I’m getting full wot on the carb??

I was cruisings around 23-25mph at 2000ish rpm until we decided to try and wot to see what we could top out at and only got it to 30mph and engine sounded like it was revving higher than tach was showing but what do I know. 

I can’t open engine box while running at speed since it’s inside the cabin and it can’t be removed without taking the whole back wall off the boat wish I remembered how to post pictures on this site

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Live2fish Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: February-27-2024 Location: Hb,ca Status: Offline Points: 29	Post Options Post Reply Quote Live2fish Report Post Thanks(0) Quote Reply Topic: Fish nautique rpm questions Posted: Today at 2:55am
	So I’m back haha dumb questions incoming put on your helmets… I have a 14x11 iirc prop boat hops up out of the hole doesn’t seem to struggle even with a load but seems like wide open only 23-2500rpm showing on the tach. (Could my tach be broken?) To me seems like that’s low, Whats a pcm 351 suppose to turn wot How do I check I’m getting full wot on the carb?? I was cruisings around 23-25mph at 2000ish rpm until we decided to try and wot to see what we could top out at and only got it to 30mph and engine sounded like it was revving higher than tach was showing but what do I know. I can’t open engine box while running at speed since it’s inside the cabin and it can’t be removed without taking the whole back wall off the boat wish I remembered how to post pictures on this site

fanofccfan Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: December-13-2009 Location: North Bend NE Status: Offline Points: 1778	Post Options Post Reply Quote fanofccfan Report Post Thanks(0) Quote Reply Posted: Today at 8:40am
	You could get a timing light with the rpm feature to find out if your rpm guage is not correct. I am no expert but I would guess 4500-5000 for average WOT
	2004 196 LE Ski 1969 Marauder 19 1978 Ski

Jonny Quest Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2976	Post Options Post Reply Quote Jonny Quest Report Post Thanks(0) Quote Reply Posted: Today at 10:21am
	That SBF should be able to cruise at 3,800 to 4,000 RPMs all day long. I agree that a timing light with a tachometer is a great tool. Assuming a 4-BBL carb, at WOT, both throttle plates (butterflies) should be vertical. Someone will have to be operating the helm while you are looking down the throat of the carb. If you have too much prop, the load on the engine is disproportionate for the RPM. Again assuming a 4-BBL Holley carb with the right prop, you can determine where the secondaries open. Then just stay below that throttle setting for cruising with optimum fuel efficiency. I realize this isn’t what you asked, but there you are… JQ
	Current 2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum

Live2fish Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: February-27-2024 Location: Hb,ca Status: Offline Points: 29	Post Options Post Reply Quote Live2fish Report Post Thanks(0) Quote Reply Posted: Today at 1:35pm
	I wish I could post a picture so you guys can see what I’m working with room wise i don’t think I can use the timing light idea. Rpm’s look sound and calculate correct up until the top end of the spectrum. The 14x11 seems to be the factory prop for my boat.

Fish nautique rpm questions

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