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bluthndr

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Where do I want idle rpm on trailer?
« on: July 30, 2022, 03:01:56 PM »
Looking for suggestions on where I should set idle on trailer.  1200ish?  Idles awesome on trailer about 900 rpm but, of course, in the water with the impeller lol ad won't stay running, and a moving, loaded boat is not ideal for idle tuning...
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TrollerDave

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Re: Where do I want idle rpm on trailer?
« Reply #1 on: July 30, 2022, 04:16:17 PM »
Quote from: bluthndr on July 30, 2022, 03:01:56 PM
Looking for suggestions on where I should set idle on trailer.  1200ish?  Idles awesome on trailer about 900 rpm but, of course, in the water with the impeller lol ad won't stay running, and a moving, loaded boat is not ideal for idle tuning...
I think I?m about 1200ish, (my tach stopped working a long time ago).
Like you said it?s different in the water, under load. Your going to have to set it a bit higher, then launch and do it on the water after it warms up a bit.

Single or dual carb?


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TrollerDave

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Re: Where do I want idle rpm on trailer?
« Reply #2 on: July 30, 2022, 04:16:48 PM »
Quote from: bluthndr on July 30, 2022, 03:01:56 PM
Looking for suggestions on where I should set idle on trailer.  1200ish?  Idles awesome on trailer about 900 rpm but, of course, in the water with the impeller lol ad won't stay running, and a moving, loaded boat is not ideal for idle tuning...
I think I?m about 1200ish, (my tach stopped working a long time ago).
Like you said it?s different in the water, under load. Your going to have to set it a bit higher, then launch and do it on the water after it warms up a bit.

Single or dual carb?


Sent from my iPhone using SoCal Jet Boats mobile app
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TrollerDave

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Re: Where do I want idle rpm on trailer?
« Reply #3 on: July 30, 2022, 04:17:05 PM »
Quote from: bluthndr on July 30, 2022, 03:01:56 PM
Looking for suggestions on where I should set idle on trailer.  1200ish?  Idles awesome on trailer about 900 rpm but, of course, in the water with the impeller lol ad won't stay running, and a moving, loaded boat is not ideal for idle tuning...
Quote from: bluthndr on July 30, 2022, 03:01:56 PM
Looking for suggestions on where I should set idle on trailer.  1200ish?  Idles awesome on trailer about 900 rpm but, of course, in the water with the impeller lol ad won't stay running, and a moving, loaded boat is not ideal for idle tuning...
I think I?m about 1200ish, (my tach stopped working a long time ago).
Like you said it?s different in the water, under load. Your going to have to set it a bit higher, then launch and do it on the water after it warms up a bit.

Single or dual carb?


Sent from my iPhone using SoCal Jet Boats mobile app
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Flusher

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Re: Where do I want idle rpm on trailer?
« Reply #4 on: July 30, 2022, 06:25:13 PM »
You shouldn't be idling your jet boat on the trailer.  You are killing the packings and taking life out of the impeller and wear ring.
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"I want to roll with my brother Joe" - Joe Bateman - January 29, 1950 ~ November 27, 2013

bluthndr

  • Karma: +0/-0
Re: Where do I want idle rpm on trailer?
« Reply #5 on: August 03, 2022, 12:10:09 PM »
Quote from: TrollerDave on July 30, 2022, 04:16:17 PM
I think I?m about 1200ish, (my tach stopped working a long time ago).
Like you said it?s different in the water, under load. Your going to have to set it a bit higher, then launch and do it on the water after it warms up a bit.

Single or dual carb?


Sent from my iPhone using SoCal Jet Boats mobile app

Single carb
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  • Boat #1: 1975 Hallett Bubble Deck
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TrollerDave

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Re: Where do I want idle rpm on trailer?
« Reply #6 on: August 03, 2022, 02:41:37 PM »
Quote from: bluthndr on August 03, 2022, 12:10:09 PM
Single carb
Quote from: bluthndr on August 03, 2022, 12:10:09 PM
Single carb
Quote from: bluthndr on August 03, 2022, 12:10:09 PM
Single carb

That makes it a bit easier.

What Joe (Flusher) is saying about killing the packings and wear ring is that they are water lubricated. Running without being in the water kind of like running a bearing with no grease.  A start up is ok, but not too long. The packing glands can start to ?burn? and the wear ring could have debris that can mar the wear ring and impeller.


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bluthndr

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Re: Where do I want idle rpm on trailer?
« Reply #7 on: August 22, 2022, 07:58:14 AM »
Set it about 12-1300, but had to put a lot more in it on the water (3-4 full turns).  Lowest I can get it in the water is about 1200, and that's with a nice lope and over 15" of vacuum.
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