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Topic: Jet question< Next Oldest | Next Newest >
tunamasterMale Offline
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Post Icon Posted: July 31 2006,2:06 pm Post # 1 see this member send this member a private message  quote this post in reply
Hey all,
I have a question.  I seem to be having an issue w/ my engine or possible jet.  So I have a 19ft open bow jet boat w/ a 454 motor in it.  The problem is it takes way to long to get on plane and my top speed is only like 30mph.  The enging is stock.  The jet is a dominator.  It idles at 500 RPM and about 40psi.  At full throtle the RPM is about 3500 and 60psi.  The jet has a hydrolic trim on it, not sure if that matters.  Does this sound accurate?  It just sems like it should get more top end speed and plane out a lot faster.
Thanks for your advise

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GoFastRacerMale Offline
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Post Icon Posted: July 31 2006,2:39 pm Post # 2 see this member send this member a private message  quote this post in reply
If all you're pulling is 3500. you're 2500 rpm short, how's the motor run, time for a tune up maybe??... :stupid
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Post Icon Posted: July 31 2006,3:44 pm Post # 3 see this member send this member a private message  quote this post in reply
Yep, Sounds Like You Have A Problem!! I would think, even if it was the smallest 454, that it should pull at least 5000 RPM.

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tunamasterMale Offline
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Post Icon Posted: July 31 2006,3:45 pm Post # 4 see this member send this member a private message  quote this post in reply
The motor actually runs good.  I get it serviced every year oil change spark plugs and general service.  The motor was a rebuild and probably has 100 or 200 hrs on it.  Is there a govenor on it maybe that is restricting it the other 2500 rpm's.

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Post Icon Posted: July 31 2006,5:05 pm Post # 5 see this member send this member a private message  quote this post in reply
Nothing that I know of.... has it run better in the past?? :stupid

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tunamasterMale Offline
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Post Icon Posted: July 31 2006,7:15 pm Post # 6 see this member send this member a private message  quote this post in reply
It has always run about the same.
Maybe a slight difference but always prety much the same.

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Post Icon Posted: July 31 2006,8:10 pm Post # 7 see this member send this member a private message  quote this post in reply
My jet runs at about 4900 rpms wide open throttle, I'm wondering if you have a partially blocked intake or if you've lost a plug wire. If the boat's run pretty flawlessly to this point I would start there...   :stupid

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GoFastRacerMale Offline
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Post Icon Posted: Aug. 01 2006,5:33 am Post # 8 see this member send this member a private message  quote this post in reply
Quote (tunamaster @ July 31 2006,3:45 pm)
The motor actually runs good.  I get it serviced every year oil change spark plugs and general service.  The motor was a rebuild and probably has 100 or 200 hrs on it.  Is there a govenor on it maybe that is restricting it the other 2500 rpm's.

But did you take a compression check, how about valve springs???.. :stupid No way they would put a rev limiter set that low, if you do have one it''ll be around the distributer but I'll just about garantee you don'r have one!.. Take the driveline off and see how the pump turns, if you can't turn it then theyre's a problem in that area. Did this just started or has it always done this??.. :stupid

Edited by GoFastRacer on Aug. 01 2006,5:37 am
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GoFastRacerMale Offline
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Post Icon Posted: Aug. 01 2006,5:38 am Post # 9 see this member send this member a private message  quote this post in reply
Quote (BarryMac @ July 31 2006,8:10 pm)
My jet runs at about 4900 rpms wide open throttle, I'm wondering if you have a partially blocked intake or if you've lost a plug wire. If the boat's run pretty flawlessly to this point I would start there...   :stupid

You're on the low side too on the rpm's!.. :D
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tunamasterMale Offline
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Post Icon Posted: Aug. 01 2006,7:04 am Post # 10 see this member send this member a private message  quote this post in reply
Quote (GoFastRacer @ Aug. 01 2006,5:33 am)
Quote (tunamaster @ July 31 2006,3:45 pm)
The motor actually runs good.  I get it serviced every year oil change spark plugs and general service.  The motor was a rebuild and probably has 100 or 200 hrs on it.  Is there a govenor on it maybe that is restricting it the other 2500 rpm's.

But did you take a compression check, how about valve springs???.. :stupid No way they would put a rev limiter set that low, if you do have one it''ll be around the distributer but I'll just about garantee you don'r have one!.. Take the driveline off and see how the pump turns, if you can't turn it then theyre's a problem in that area. Did this just started or has it always done this??.. :stupid

It has always been like this.  I am not really mechanically inclined, so I normally take it to ADM boatworks to get it worked on.  SO do you think it is more of a pump issue, then a motor issue?

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GoFastRacerMale Offline
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Post Icon Posted: Aug. 01 2006,7:17 am Post # 11 see this member send this member a private message  quote this post in reply
Quote (tunamaster @ Aug. 01 2006,7:04 am)
Quote (GoFastRacer @ Aug. 01 2006,5:33 am)
Quote (tunamaster @ July 31 2006,3:45 pm)
The motor actually runs good.  I get it serviced every year oil change spark plugs and general service.  The motor was a rebuild and probably has 100 or 200 hrs on it.  Is there a govenor on it maybe that is restricting it the other 2500 rpm's.

But did you take a compression check, how about valve springs???.. :stupid No way they would put a rev limiter set that low, if you do have one it''ll be around the distributer but I'll just about garantee you don'r have one!.. Take the driveline off and see how the pump turns, if you can't turn it then theyre's a problem in that area. Did this just started or has it always done this??.. :stupid

It has always been like this.  I am not really mechanically inclined, so I normally take it to ADM boatworks to get it worked on.  SO do you think it is more of a pump issue, then a motor issue?

No way to tell until you check the pump, a problem there could pull the motor down, then again it could the motor but you check one thing at a time and the pump would be the first place to start!..
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Post Icon Posted: Aug. 01 2006,7:28 am Post # 12 see this member send this member a private message  quote this post in reply
Quote (tunamaster @ July 31 2006,2:06 pm)
Hey all,
I have a question.  I seem to be having an issue w/ my engine or possible jet.  So I have a 19ft open bow jet boat w/ a 454 motor in it.  The problem is it takes way to long to get on plane and my top speed is only like 30mph.  The enging is stock.  The jet is a dominator.  It idles at 500 RPM and about 40psi.  At full throtle the RPM is about 3500 and 60psi.  The jet has a hydrolic trim on it, not sure if that matters.  Does this sound accurate?  It just sems like it should get more top end speed and plane out a lot faster.
Thanks for your advise

Im just curious have you ever had a GPS with you at WOT...  If you are going 50 or 60... There might be a problem with the tach.

Im thinking that 3500 rpm is barely on plane and about 35 mph.. I cant imagine that any jet boater would be satisfied with this for that long...


just a thought...

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tunamasterMale Offline
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Post Icon Posted: Aug. 01 2006,7:48 am Post # 13 see this member send this member a private message  quote this post in reply
Quote (MrCord @ Aug. 01 2006,7:28 am)
Quote (tunamaster @ July 31 2006,2:06 pm)
Hey all,
I have a question.  I seem to be having an issue w/ my engine or possible jet.  So I have a 19ft open bow jet boat w/ a 454 motor in it.  The problem is it takes way to long to get on plane and my top speed is only like 30mph.  The enging is stock.  The jet is a dominator.  It idles at 500 RPM and about 40psi.  At full throtle the RPM is about 3500 and 60psi.  The jet has a hydrolic trim on it, not sure if that matters.  Does this sound accurate?  It just sems like it should get more top end speed and plane out a lot faster.
Thanks for your advise

Im just curious have you ever had a GPS with you at WOT...  If you are going 50 or 60... There might be a problem with the tach.

Im thinking that 3500 rpm is barely on plane and about 35 mph.. I cant imagine that any jet boater would be satisfied with this for that long...


just a thought...

I am prety sure the tach is good.  The boat actually struggles to get on plane only with two people in it.  I am somewhat new to boating and this is my first one, so I wasn't really sure what ideal performance would be.  But there has got to be a problem if it is only pulling at the most 35 mph.  
By the way, when I bought the boat the engine was a brand new re-build, could that have something to do with it?

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Post Icon Posted: Aug. 01 2006,7:51 am Post # 14 see this member send this member a private message  quote this post in reply
Quote (MrCord @ Aug. 01 2006,7:28 am)
Im thinking that 3500 rpm is barely on plane and about 35 mph..

Back in the day the MFG's never put speedos in jets just a tach, and they were setup that the mph was right around the same as the tach!.
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Post Icon Posted: Aug. 01 2006,12:52 pm Post # 15 see this member send this member a private message  quote this post in reply
Quote (tunamaster @ Aug. 01 2006,7:48 am)
Quote (MrCord @ Aug. 01 2006,7:28 am)
Quote (tunamaster @ July 31 2006,2:06 pm)
Hey all,
I have a question.  I seem to be having an issue w/ my engine or possible jet.  So I have a 19ft open bow jet boat w/ a 454 motor in it.  The problem is it takes way to long to get on plane and my top speed is only like 30mph.  The enging is stock.  The jet is a dominator.  It idles at 500 RPM and about 40psi.  At full throtle the RPM is about 3500 and 60psi.  The jet has a hydrolic trim on it, not sure if that matters.  Does this sound accurate?  It just sems like it should get more top end speed and plane out a lot faster.
Thanks for your advise

Im just curious have you ever had a GPS with you at WOT...  If you are going 50 or 60... There might be a problem with the tach.

Im thinking that 3500 rpm is barely on plane and about 35 mph.. I cant imagine that any jet boater would be satisfied with this for that long...


just a thought...

I am prety sure the tach is good.  The boat actually struggles to get on plane only with two people in it.  I am somewhat new to boating and this is my first one, so I wasn't really sure what ideal performance would be.  But there has got to be a problem if it is only pulling at the most 35 mph.  
By the way, when I bought the boat the engine was a brand new re-build, could that have something to do with it?

Have you checked the firing order?

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tunamasterMale Offline
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Post Icon Posted: Aug. 01 2006,1:06 pm Post # 16 see this member send this member a private message  quote this post in reply
I haven't checked anything yet.
I have no clue about engines.
I will take it in to get looked at I just don't know what I should expect.

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Post Icon Posted: Aug. 01 2006,1:16 pm Post # 17 see this member send this member a private message  quote this post in reply
If the motor runs decent, I wouldn't think that it would be anything too major....

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Post Icon Posted: Aug. 01 2006,3:41 pm Post # 18 see this member send this member a private message  quote this post in reply
If ADM can't help, call GS Marine in Corona.  (951) 272-6060.  :good  Greg runs a stand up shop and won't feed you any bull.  He's a jet only guy and can probably steer you in the right direction if you get stuck.  At 3500 R's, you def have a problem.  You should be somewhere in the 5 - 6K range depending on setup.  Best of luck.
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Post Icon Posted: Aug. 02 2006,5:27 am Post # 19 see this member send this member a private message  quote this post in reply
Quote (tunamaster @ Aug. 01 2006,1:06 pm)
I just don't know what I should expect.

The worse, then when it's a quick fix it makes your day!.. :D  :good  :laugh
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Post Icon Posted: Aug. 02 2006,10:30 am Post # 20 see this member send this member a private message  quote this post in reply
That's pretty odd, some good suggestions already, a few more to consider. Have you checked the intake of the pump to see if anything is lodged in there (maybe some weeds or something).  Also, i'm surprised you are only running 40psi on the oil, I would think that you should be running more around 60psi+. If you're a newbie to jets and don't wrench on your own things - jet boats are perfect to learn on. If you are looking for a reasonable place to bring the boat to, try Tom Papp  in Corona. He's a really good guy and won't bullshit you.....
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Post Icon Posted: Aug. 03 2006,5:32 am Post # 21 see this member send this member a private message  quote this post in reply
Quote (Lightning @ Aug. 02 2006,10:30 am)
Also, i'm surprised you are only running 40psi on the oil, I would think that you should be running more around 60psi+.

If it's a bone stocker with a stock "unblueprinted" pump, that's not too uncommon after the oil gets hot, weight and clearances are a factor too!.. :)
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Post Icon Posted: Aug. 03 2006,5:34 am Post # 22 see this member send this member a private message  quote this post in reply
Quote (tunamaster @ Aug. 01 2006,7:48 am)
By the way, when I bought the boat the engine was a brand new re-build, could that have something to do with it?

Depends on who rebuilt it!.. :eek  :stupid
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Post Icon Posted: Aug. 03 2006,7:04 am Post # 23 see this member send this member a private message  quote this post in reply
Quote (GoFastRacer @ Aug. 03 2006,5:32 am)
Quote (Lightning @ Aug. 02 2006,10:30 am)
Also, i'm surprised you are only running 40psi on the oil, I would think that you should be running more around 60psi+.

If it's a bone stocker with a stock "unblueprinted" pump, that's not too uncommon after the oil gets hot, weight and clearances are a factor too!.. :)

That's what I find with mine, when I start out the oil pressure is at 60psi, after I've run for a while and the engine gets hot the Oil pressure drops to 40psi...

I wonder if his pump is getting tired???

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Post Icon Posted: Aug. 03 2006,7:07 am Post # 24 see this member send this member a private message  quote this post in reply
i had that too... I started around 80 psi then after a hard run it would drop to 40 or so...  But after running lighter it would go back.  But what worried me was at idle 900 rpm the pressure was 25psi when really hot.

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Post Icon Posted: Aug. 03 2006,11:26 am Post # 25 see this member send this member a private message  quote this post in reply
Quote (BarryMac @ Aug. 03 2006,7:04 am)
Quote (GoFastRacer @ Aug. 03 2006,5:32 am)
Quote (Lightning @ Aug. 02 2006,10:30 am)
Also, i'm surprised you are only running 40psi on the oil, I would think that you should be running more around 60psi+.

If it's a bone stocker with a stock "unblueprinted" pump, that's not too uncommon after the oil gets hot, weight and clearances are a factor too!.. :)

That's what I find with mine, when I start out the oil pressure is at 60psi, after I've run for a while and the engine gets hot the Oil pressure drops to 40psi...

I wonder if his pump is getting tired???

Wnen oil gets hot it thins out, 50wt and 30wt will show a huge difference in pressure and as I said clearances in the motor makes a difference, and the clearances in stock pumps are out to lunch also, so depending on what WT oil he's using it's normal!.. Take a look at your pressure in your tow vehicle at idle after 200 miles in 110 degree heat, you'll be surprised!.. :eek
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