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czomega77

  • Karma: +2/-0
Indmar stock 454 max rpm
« on: September 13, 2015, 02:02:17 PM »
Hey guys looking for some info on my motor's rpm's its a stock 454 in a 2002 cobra open bow with a legend pump a cut impeller and It tops out at 4200 rpm is that correct? Thanks
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GT Jets

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Re: Indmar stock 454 max rpm
« Reply #1 on: September 13, 2015, 02:25:46 PM »
IMHO your about 300 rpm short.
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Quote from: Brad @ SoCalJetBoats.com on December 22, 2009, 07:40:31 PM
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Quote from: IRRebel on June 11, 2011, 07:30:45 PM
Time to man up and yank it John!  :banghead:
Ray

czomega77

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Re: Indmar stock 454 max rpm
« Reply #2 on: September 13, 2015, 02:32:55 PM »
That what I was thinking from reading other posts but wanted to ask. What should I start looking at first to fix this problem?
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GT Jets

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Re: Indmar stock 454 max rpm
« Reply #3 on: September 13, 2015, 02:37:15 PM »
Quote from: czomega77 on September 13, 2015, 02:32:55 PM
That what I was thinking from reading other posts but wanted to ask. What should I start looking at first to fix this problem?

Start with the obvious.

Tune; timing,  fuel pressure,  spark plug gap,  jetting,  throttle linkage etc.

Pump Condition;  impeller blade condition, debris etc.

Check tach;  accuracy? 

It gets more expensive from there.

GT
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Quote from: Brad @ SoCalJetBoats.com on December 22, 2009, 07:40:31 PM
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Quote from: IRRebel on June 11, 2011, 07:30:45 PM
Time to man up and yank it John!  :banghead:
Ray

Mille170

  • Karma: +1/-0
Re: Indmar stock 454 max rpm
« Reply #4 on: September 13, 2015, 05:21:37 PM »
We are in the exact same situation. My 454 tops out at 4200 as well. I will keep you updated with what works for me. Next trip out I am changing the ignition module, flame arrestor and hopefully carb. I'll let you know if I am able to spin more rpm.


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czomega77

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Re: Indmar stock 454 max rpm
« Reply #5 on: September 13, 2015, 08:36:39 PM »
I'm going to make some adjustments and check everything next trip and see what happens I'll update as well
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rush1

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Re: Indmar stock 454 max rpm
« Reply #6 on: September 14, 2015, 08:48:58 AM »
Mine tops out at 4400, I'm running a 780 holley vacuum secondarys an accell hei and an edelbrock manifold stock a cut aluminum impeller
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78Centurionbbc

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Re: Indmar stock 454 max rpm
« Reply #7 on: September 14, 2015, 11:48:43 AM »
Mine tops out at 4900, running demon 850 carb, mag ignition....


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mash on it

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Re: Indmar stock 454 max rpm
« Reply #8 on: September 14, 2015, 12:17:38 PM »
Quote from: rush1 on September 14, 2015, 08:48:58 AM
Mine tops out at 4400, I'm running a 780 holley vacuum secondarys an accell hei and an edelbrock manifold stock a cut aluminum impeller

This is a tad shy for a 330 hp 454, could be tach inaccuracy, or needing a little more timing, if everything else checks out OK.

My ~ 330 hp 350 was at 45-4600 rpm with an A. (It did have O.T. headers)

Quote from: czomega77 on September 13, 2015, 02:02:17 PM
Hey guys looking for some info on my motor's rpm's its a stock 454 in a 2002 cobra open bow with a legend pump a cut impeller and It tops out at 4200 rpm is that correct? Thanks

Like GT said, about 300 or so rpm short.

I tend to stay conservative on timing but it seems a BBC likes about 12-14* initial, or 32-34* total

Quote from: 78Centurionbbc on September 14, 2015, 11:48:43 AM
Mine tops out at 4900, running demon 850 carb, mag ignition....


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Mine too, 750 holley VS, GM HEI, logs and snails, 4900-5k, AA impeller though

Dan'l
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rush1

  • Karma: +18/-0
Re: Indmar stock 454 max rpm
« Reply #9 on: September 14, 2015, 12:21:32 PM »
Your right I'm down to a 105 psi in 6 cylinders and 85 in #1 & 6  going to be putting a new engine in and rebuild the pump this winter, still hits 53 on GPS.
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mash on it

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Re: Indmar stock 454 max rpm
« Reply #10 on: September 14, 2015, 01:14:31 PM »
Quote from: rush1 on September 14, 2015, 12:21:32 PM
Your right I'm down to a 105 psi in 6 cylinders and 85 in #1 & 6  going to be putting a new engine in and rebuild the pump this winter, still hits 53 on GPS.

Throw a squirt or two of oil into #'s 1 & 6, and run compression check again

no change...valves
big change...rings

Also check the cam lobes on #'s 1&6 (flat?)

standard bore motor? how many hours on it? Maybe it needs a refresh- rings, bearings, hand lap the valves, new cam, oil pump and gaskets...weekend project :thumbup:

Dan'l

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rush1

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Re: Indmar stock 454 max rpm
« Reply #11 on: September 14, 2015, 01:18:52 PM »
Quote from: mash on it on September 14, 2015, 01:14:31 PM
Throw a squirt or two of oil into #'s 1 & 6, and run compression check again

no change...valves
big change...rings

Also check the cam lobes on #'s 1&6 (flat?)

standard bore motor? how many hours on it? Maybe it needs a refresh- rings, bearings, hand lap the valves, new cam, oil pump and gaskets...weekend project :thumbup:

Dan'l
I did it's the rings ,when I bought it, it had 325 hours on it two years ago since then I've put another 300 hours on it, LOL ,I just ran it from Laughlin to pirates cove on Saturday, the wife and I run the heck out of it, for us it's nothing to leave the islander go to the casino for breakfast head over to pirates for lunch and Havasu springs for dinner in a day!
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rush1

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Re: Indmar stock 454 max rpm
« Reply #12 on: September 14, 2015, 01:20:52 PM »
Yeah its an 89 standard bore peanut plug head, I want to throw a 496 in it
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GT Jets

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Re: Indmar stock 454 max rpm
« Reply #13 on: September 14, 2015, 02:12:58 PM »
Quote from: rush1 on September 14, 2015, 01:18:52 PM
I did it's the rings ,when I bought it, it had 325 hours on it two years ago since then I've put another 300 hours on it, LOL ,I just ran it from Laughlin to pirates cove on Saturday, the wife and I run the heck out of it, for us it's nothing to leave the islander go to the casino for breakfast head over to pirates for lunch and Havasu springs for dinner in a day!

Throw a can of Restore in it. That shit works.

GT

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Quote from: Brad @ SoCalJetBoats.com on December 22, 2009, 07:40:31 PM
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Quote from: IRRebel on June 11, 2011, 07:30:45 PM
Time to man up and yank it John!  :banghead:
Ray

rush1

  • Karma: +18/-0
Re: Indmar stock 454 max rpm
« Reply #14 on: September 14, 2015, 02:15:29 PM »
Quote from: GT Jets on September 14, 2015, 02:12:58 PM
Throw a can of Restore in it. That shit works.

GT

Sent from my SCH-I545 using SoCal Jet Boats mobile app
That's funny you said that I meant to do that this weekend and ended up adding a quart of oil, I use to run it in my old Plymouth station wagon tow car.
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sandaddict

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Re: Indmar stock 454 max rpm
« Reply #15 on: September 15, 2015, 07:05:54 PM »
Was just gonna post the same question about my Indmar 454.    Hittin about 4400 with an A cut in a 19ft Commander SS.  Doesn't seem to want to top 43 mph...   👎👎👎👎
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H20Nut21Bahner

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Re: Indmar stock 454 max rpm
« Reply #16 on: September 15, 2015, 08:05:19 PM »
Quote from: sandaddict on September 15, 2015, 07:05:54 PM
Was just gonna post the same question about my Indmar 454.    Hittin about 4400 with an A cut in a 19ft Commander SS.  Doesn't seem to want to top 43 mph...   👎👎👎👎
Better check your tach or impeller. At 49 I'm spinning 4200 and I got 2' on you
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sandaddict

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Re: Indmar stock 454 max rpm
« Reply #17 on: September 15, 2015, 09:09:40 PM »
Quote from: H20Nut21Bahner on September 15, 2015, 08:05:19 PM
Better check your tach or impeller. At 49 I'm spinning 4200 and I got 2' on you
Yeah gonna try a couple things...
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