What RPM's should I be getting out a new rebuilt 454
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What RPM's should I be getting out a new rebuilt 454

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    Member Get'erWet's Avatar
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    Default What RPM's should I be getting out a new rebuilt 454

    OK...I know nothing about 454's, this is my first....
    I have a 21' Rochell Craft OB, Berkley JE, 454 Just rebuilt this thang, bottom end is stock as well as the oval port heads.
    Mod's / upgrades during rebuild.
    SLR Cam 218/228 .523/.532
    Edelbrock RPM Air Gap Intake (already had a Edelbrock 750) / ditched the stock cast iron intake.
    HEI 50K distributor / ditched the points / coil dist.
    10qt Hamburgers Oil Pan

    Timing set at 8 deg BTDC (don't quite know what the Advanced Vacuum is set at on HEI), plugs gapped to .045"...only getting 3k RPM's at 54MPH...is this all this slug will put out...?
    Open to any and all comments suggestions and help...thanks in advance...!
    I was doing better before the rebuild.

    Diamond Dave

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    New here Beer:30's Avatar
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    First - get your timing squared away:

    1. Put water to it.
    2. UNPLUG the vacuum advance pot and plug the port (on the carb).
    3. Loosen the distributor clamp a few turns.
    4. Fire it up.
    5. Use a timing light with advance dial - set it at 36*
    6. Rev the motor and watch the balancer with the timing light. When it stops advancing, note the RPM. Probably 3000 or so.
    7. If you let it back down - rev the motor to that rpm and twist the distributor until your balancer / pointer are at 0 (ZERO).

    This will have you set at 36 TOTAL degrees of timing. Don't even worry about idle setting. Probably 38 or 40 is gonna be your end result, but start at 36 and make sure you are not pinging under a load. If not, go up a degree or two at a time until it pings. 38-39 is usually the magic number.

    You can hook the vacuum advance back up after each setting. Just make sure you don't go to set it with it hooked up. You'll be WAY off. Also make sure the vac source is timed and not straight manifold vacuum. On an Edelbrock, it would be the port on the left front face of the carb. Left side being the side that has the throttle arm. You can also look into ditching the Edelbrock and put a Holley or Demon on it. If you want economy, you go Edelbrock - if you want power, you go Holley or Demon, or......

    Make sure to tighten the distributor at least to where it will not rotate when running. You can also do it on the lake and just keep advancing a bit here and there until you hear it ping. This is a bit more dangerous, but being a low-per setup, you shouldn't hurt anything.

    After you have your timing set, if it's not running well by then, move on to other things.
    Last edited by Beer:30; 10-07-2010 at 08:40 PM.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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    Member Get'erWet's Avatar
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    Thx Beer 30
    Running out today to get a new timing light....I had the Vacuum hooked up on the Right side of the Carb after setting the timing with my old school timing light. Again I can only get MAX 3K RPM....so after having done your recommendation with the new timing light should I be getting more RPM's...?

    thx again....!

    Diamond Dave

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    New here Beer:30's Avatar
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    Quote Originally Posted by Get'erWet View Post
    Thx Beer 30
    Running out today to get a new timing light....I had the Vacuum hooked up on the Right side of the Carb after setting the timing with my old school timing light. Again I can only get MAX 3K RPM....so after having done your recommendation with the new timing light should I be getting more RPM's...?

    thx again....!

    Diamond Dave
    Wow, your timing is WAY WAY off, then. With the vac hooked to full-time source, your idle setting of 8 would be very retarded.

    I would HOPE you would pull more than you had before - get the timing done first and then move on from there.

    I am assuming the cam was installed straight-up? Not advanced or retarded?

    Were the valves adjusted properly?
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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    Senior Member Josh@JBP's Avatar
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    Quote Originally Posted by Get'erWet View Post
    only getting 3k RPM's at 54MPH...is this all this slug will put out...?
    Your tach is crazy, 100% loco. Check to make sure its is on the right cylinder selection. When we were seling Beede's they would come preset on the 12cyl selection, we used to get this call a lot. A true 3000rpm is probably your plane speed. At a glance with no other info that bbc should turn around 4800 with an A or 4500 with a AA.

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    gn7
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    Quote Originally Posted by [email protected] View Post
    Your tach is crazy, 100% loco. Check to make sure its is on the right cylinder selection. When we were seling Beede's they would come preset on the , we used to get this call a lot. A true 3000rpm is probably your plane speed. At a glance with no other info that bbc should turn around 4800 with an A or 4500 with a AA.
    At first I thought 12 cyl! Then the 6 cyl 2 stroke out board hit me

    You think 54 is a little much for 3000



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    Senior Member Josh@JBP's Avatar
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    Quote Originally Posted by gn7 View Post
    At first I thought 12 cyl! Then the 6 cyl 2 stroke out board hit me

    You think 54 is a little much for 3000
    Just pulled a nos tach off the shelf and it actually says "12palt", not 12cyl.....still wrong....if thats the case

    Quite honestly 21' open bow with fairly stock BBC and a E pump, i'd say your sneekn up on your top speed at 54, ditchn the AFB for a Holley type carb should be worth some rpms and mph. But first thing is first, you need to get your tach workn.

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    New here Beer:30's Avatar
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    Good point(s) - no pun intended.

    Get'erWet - if you haven't bought your timing light yet, make sure you get one with a tach built into it. This will help in all areas.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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    Member Get'erWet's Avatar
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    Hay Beer :30,
    Done got the Timing Light....Harbor Freight. Tach could be off...it's a 31 yr old boat. Before the rebuild of pump and motor top speed was about 57/58, don't recall RPM's B4 hand. "A" impellar put in but it was cut smaller AB...? I would think that I would get more RPM's with it...?
    Set out for the Lake tomorrow for more testing...think I had a vacuum leak with carb gasket...removed the Spacer plate and installed new gasket. We'll see..........

    Diamond Dave

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    Senior Member Josh@JBP's Avatar
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    Quote Originally Posted by Get'erWet View Post
    Hay Beer :30,
    Done got the Timing Light....Harbor Freight. Tach could be off...it's a 31 yr old boat. Before the rebuild of pump and motor top speed was about 57/58, don't recall RPM's B4 hand. "A" impellar put in but it was cut smaller AB...? I would think that I would get more RPM's with it...?
    Set out for the Lake tomorrow for more testing...think I had a vacuum leak with carb gasket...removed the Spacer plate and installed new gasket. We'll see..........

    Diamond Dave
    If its a two wire tach (ground and signal) it may not be compatible with the hei....thats about all i got on tachs

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    It's what we do BDMarine's Avatar
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    Timing was definitely off and so is the tach. 3000 in that boat is no where near 54 mph.
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    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by gn7 View Post
    ...think 54 is a little much for 3000
    I would take that in a heartbeat > talk about efficiency!
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    and plug the vac. advance completely! you don't need it, jetboat is always under load-you would never see any benefit from it!

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    Member Get'erWet's Avatar
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    OK...so I've surely come to the conclusion that my Tach is Wacked...thx all for opening my eyes. New gauges on order. So I went and got a Dial timing Light....to make sure I do this right.
    Plug Vac on both Carb & Distributor....Set dial to 36 deg run engine up to ???? RPM's and make sure balancer mark comes on zero deg.
    Did a little adjustment on the water yesterday and then drove it like I stole it and got 60 mph out of her...I think she has a bit more in her...The guy that freshend up my pump changed out my "A" impeller and said the one he put in is a B minus...? Again, I know a lot of things but not a lot about all this....so having said that, once again N E advice is welcome..

    Diamond Dave

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