BBF wont run right
+ Reply to Thread
Page 1 of 2 1 2 LastLast
Results 1 to 14 of 28

Thread:
BBF wont run right

  1. #1
    Junior Member
    Join Date
    Nov 2011
    Location
    Holiday Florida
    Posts
    10

    Default BBF wont run right

    To recap: 17’ Sutphen (see avatar) "everything" rebuilt

    re-built 460 20 over w/mild headwork (exh 2.190 int 1.710)
    800DP Holley rebuilt
    All Mallory ignition (6m-2c, blaster 3 coil) and wires
    re-built and blueprinted Berkeley pump by ARS w/stuffer & place diverter and new grate stuff
    Edlebrock Performer 460 manifold (specs say it needs 9.5-1 comp)
    Crower 460 cam (specs say it needs 10.25-1 comp)

    Previous owner was going to put a blower on it and therefore had 8.1 compression on rebuild…would this cause the problems since cam and intake seem to be a miss match…

    Here is the problem…boat will come out of the hole fine but when it hits around 3500 rpm it hesitates as if you are holding on to it…kinda like a skiier on the back end pulling hard across the wake…it tops out around 45mph or so …and it just wont “open up completely”…don’t know how to describe it better than that…secondaries are opening up and nothing messed up in pump or grate…timing is around 30 degrees…

    Any thoughts would be most appreciated

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Senior Member ap67et10's Avatar
    Join Date
    Mar 2008
    Location
    Chico, Ca
    Posts
    1,533

    Default

    That sounds like a terrible setup. An engine with no compression, a cam that's way too big for the setup and probably an A or so impeller? Also is 30 timing the total advance? Probably a bunch more advance would help with the low compression and all the mismatched parts. Get some boost or some new pistons and maybe a new cam....depending what the actual spec of it are and what direction you end up going to fix these issues. I'm sure it'll be asked, but do you have the cam specs?

    AP

  4. #3
    Senior Member Marcsrollin's Avatar
    Join Date
    May 2008
    Location
    El Cajon , Ca
    Posts
    574

    Default

    If you are running a ignition box , check to make sure there is not a rev limiter chip in it.
    No matter how good she looks , someone is tired of her shit!

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Senior Member
    Join Date
    Feb 2012
    Location
    OC, CA
    Posts
    359

    Default

    You need to try more timing, say 34 to 35 degrees maybe more at 3000 RPM, all in. Good way to check it is to get it out on the water, run the boat up to 3500 and have some one slowly turn the disty with timing light hooked up. You can set it on the trailer and time it, but under load is a different story. Also, make sure you are getting good constant fuel pressure to the carb, at least 6 to 7lbs.
    Last edited by Ol Blue; 03-30-2012 at 11:53 AM.

  7. #5
    Promoting pollution Smog Pump's Avatar
    Join Date
    Sep 2010
    Location
    Pumpkin Center, CA
    Posts
    267

    Default

    Talked to RiverRacer a couple minutes ago. I asked him about your engine. He said to tell you to try 38-40 degrees advance. The quicker it's all in the better, but it should all be in by 3500 even with a stock Distributor. You will have to run lots of initial if it's a stock type, but it will help the engine thru it's problem area.


  8. #6
    Led
    Led is offline
    Senior Member Led's Avatar
    Join Date
    Jul 2010
    Posts
    1,493

    Default

    Agree! Run it on the trailer, see if it opens up. Then with it in the water under a load, I would lean towards ignition also.

  9. #7
    Senior Member bp298's Avatar
    Join Date
    Dec 2007
    Location
    LHC
    Posts
    6,573

    Default

    Quote Originally Posted by barefootin View Post
    re-built 460 20 over w/mild headwork (exh 2.190 int 1.710)
    ??????

    Quote Originally Posted by Led View Post
    Agree! Run it on the trailer, see if it opens up. Then with it in the water under a load, I would lean towards ignition also.
    robert, it's fuel related, not ignition.

  10. #8
    ptc
    ptc is offline
    Senior Member ptc's Avatar
    Join Date
    Oct 2010
    Location
    Sacramento Area
    Posts
    3,755

    Default

    sounds pretty retarded.... to me
    1975 Sanger True Flat - 496 BBC
    http://v-drivecalifornia.blogspot.com/

  11. #9
    Led
    Led is offline
    Senior Member Led's Avatar
    Join Date
    Jul 2010
    Posts
    1,493

    Default

    manual or electric fuel pump?

  12. #10
    Senior Member wolfie's Avatar
    Join Date
    Dec 2007
    Location
    In the garage working on the boat in Utah, United States
    Posts
    7,810

    Default

    I had a similar problem at the end of the season last year. Hesitating and popping at throttle. As we were heading into the marina, it kept getting worse. I could only get 3500 out of it but idled perfectly. Ignition has only a few runs on it. It all sounded like fuel delivery.

    I know here in Utah they're adding 10-15% ethanol to the fuel. I've heard of a few people having issues with seals and rubbers with their equipment. I've had fuel pump issues with a new fuel pump. As I switch out my stuff, I'm adding parts that are alcohol compatible. Not sure if that could be your problem but you may want to check you carb, fuel pump, or lines.

  13. #11
    Senior Member
    Join Date
    Feb 2012
    Location
    OC, CA
    Posts
    359

    Default

    It could be both Fuel & Ignition. One of my boats is a 20ft, heavy, Spectra cruiser with a stock 460 and a Berk 12-JC stock in need of work. After I took out the Prestilite disty and threw it as far as I could, I put in a MSD & spark plug wires and plugs. Timing is set at 34degrees. Would rev up real good on the trailer, put a load on it in the water and would start cutting out. Put another fuel pump on it and pressure would now hold at 6 to 7psi on a 750 DP. Motor now spins upto 4900 and GPS at 56mph and this is with a pump that needs to be gone thru.

    With your tight pump, you should be spinning up to maybe 4800 and be running in the 60's in a 17 ft boat.

  14. #12
    Junior Member
    Join Date
    Nov 2011
    Location
    Holiday Florida
    Posts
    10

    Default

    dang it...the ignition is not mallory but a complete MSD with marine cdi igniton 6M2L...marine distributor...and coil and wires...the advanced timing is controlled in distributor by weight springs and advance cam stop bushings...sorry for the screw up...
    some cam specs are:ADVERTISED CAMSHAFT SPECIFICATIONS:
    INTAKE: Duration: 311º Lift: .588 Clearance Hot: .000 EXHAUST: Duration: 316º Lift: .604 Clearance Hot: .000
    ULTRA PERFORMANCE COMPU-PRO / PERFORMANCE LEVEL 4Dual purpose hot street/strip camshaft. Delivers strong mid-range
    and top end torque and horsepower.
    RPM Power Range: 2000 to 6000 / Redline: 7000 plus.

  15. #13
    Senior Member
    Join Date
    Feb 2012
    Location
    OC, CA
    Posts
    359

    Default

    Of course you could use more compression. But I'm leaning more towards what bp298 said, you may not be getting fuel to the carb. Check your fuel pressure at the carb under load, up the timing and go from there.

  16. #14
    Senior Member
    Join Date
    Apr 2010
    Posts
    122

    Default

    i agree with ap.
    that cam sounds way big for 8:1.

    done a compression test? that would say a lot.

+ Reply to Thread
Page 1 of 2 1 2 LastLast

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

Log-in


Tags for this Thread

Digg This Thread

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •  
 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95