looking for berkley help
+ Reply to Thread
Page 1 of 4 1 2 3 4 LastLast
Results 1 to 14 of 56

Thread:
looking for berkley help

  1. #1
    Horsepower sells Engines lefty's pride's Avatar
    Join Date
    Nov 2009
    Location
    Langley, B.C. Canada
    Posts
    402

    Lightbulb looking for berkley help

    I’m running a stock 12jc, I was wondering if or at what rpm the jet caveats? Is there a sufficient gain going with the inducer that Berkeley carries? Any body have a good chart for impeller cut on the berkeley site is says that the aluminum is good for 500 hp but if you look at the chart the max is much lower but the rpm is still correct. If any body has answers it would be nice. and if any has other good facts id like to hear them



    thanks

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Senior Member Luckie Stiff's Avatar
    Join Date
    Dec 2007
    Location
    Bakersfield
    Posts
    1,189

    Default

    Not sure where you're located, if it's Langley VA, try Duane @ Hi Tech marine for help, if it's Langley B.C. there is a guy on here that has a boat shop somewhere in BC, maybe do a search for him
    "Don't you realize that there are already enough people in the world to hate without you putting in so much effort to give me another?"

  4. #3
    Horsepower sells Engines lefty's pride's Avatar
    Join Date
    Nov 2009
    Location
    Langley, B.C. Canada
    Posts
    402

    Default

    im in lanlgey b.c. canada.

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Senior Member jetboatperformance's Avatar
    Join Date
    Dec 2007
    Location
    Atascadero Calif
    Posts
    7,464

    Default

    Lefty's Not certain I completely understand your question , there isnt a set rpm that will your jet will "caviate" The charts show the RPM vs the power absorbsion , If what your saying is the charts go beyond the HP for an aluminum Impeller (oem is typically 450hp) , they (the charts) are also refering to the "cut" of the impeller whether its aluminum , Bronze or stainless Here the A/T Dominator Chart to help you Tom



    H.P. 9.5 9.25 AA A B C
    150 2900 3050 3200 3600 3800 4050
    200 3200 3350 3500 4000 4200 4450
    250 3450 3600 3700 4300 4500 4800
    300 3800 3950 4050 4550 4800 5100
    350 4050 4200 4300 4750 5100 5350
    400 4250 4400 4500 5050 5300 5600
    450 4450 4600 4700 5250 5500 5850
    500 4650 4800 4950 5400 5700 6050
    550 4800 4950 5100 5550 5850 N/A
    *THESE RPM VALUES MAY VARY ACCORDING TO HOW YOUR BOAT ALLOWS THE PUMP TO LOAD
    HORSE POWER REQUIREMENTS ARE AT THE PUMP SHAFT

  7. #5
    Horsepower sells Engines lefty's pride's Avatar
    Join Date
    Nov 2009
    Location
    Langley, B.C. Canada
    Posts
    402

    Default

    That chart does help for the one question i had the chart that i was using was

    If you look at this pic you see the max hp is less than there 500 and it also doesnt show the a3 and a4 cut impeller. is that what the 9.5 and the 9.25 is in your diagram? and this is showing when the engine maxes out (stalls) in rpm? also this berkley chart is very close to what i have for horse power i dont see any more than 3500 rpm now but im looking to re build my engine but im looking for what hp requirments i need and whee i neede to go to a stain less or brass im not looking to make huge power id like to see 454 or around that
    Last edited by lefty's pride; 11-15-2009 at 07:01 PM.

  8. #6
    Senior Member jetboatperformance's Avatar
    Join Date
    Dec 2007
    Location
    Atascadero Calif
    Posts
    7,464

    Default

    First that chart is ancient (no offense please ) , suggest you use the AT chart or something more up to date , without know more about your actual boat (and engine) I'd say your way down on power or your tach is incorrect and need to look at possible engine issues with what looks like a BBC (in your pic) and only 3500 rpms ? and its not a cavitation problem . Happy to try to help, more info please Tom

    here "Duanes" chart , maybe someones got a clearer copy ?)


  9. #7
    northern member Canuc's Avatar
    Join Date
    Jan 2008
    Location
    Nechako
    Posts
    602

    Default

    lefty, spell check on your hometown if your pump is cavating you could have a worn impeller or wearing . if the pump is getting good flow through the intake you shouldn't need a inducer unless you are runnin a small impeller cut . good time to have a look with winter here . California marine in Richmond sell's A/T parts . your right their comparable impellers to the Berkeley A3 and A4 is the 9.25 and 9.5 . they don't fit a Berkeley without machining them to 9'' OD . i also stock small parts , kits and impellers . let me know if i can help.
    Quote Originally Posted by gn7 If your ran a cammer your odds of finishing WERE ZERO.

  10. #8
    Horsepower sells Engines lefty's pride's Avatar
    Join Date
    Nov 2009
    Location
    Langley, B.C. Canada
    Posts
    402

    Default

    Ok I'm running a 1979 454 casting #361959 stock, with the older heads on it cast #353049 again all stock. Also a 850 holly I know it is way to big. I got a 650 holly double pumper to replace it for next year help with that low-end power. I do believe I’m down on a little power with a bit of blow by. But looking on the net I don’t find many sites say I have more than 250hp. And to the last post. I rebuilt the jet two years ago I had leaky bowl seals and worn bushings but I replaced the impeller at that point due to some nicks in the impeller surface. But I don’t think that I am cavatating, I was just wounding when I go to build my new motor at what rpm if any would the pump cavatate? The biggest problem I had doing the re build is getting the rope packings to seal. Last thing California marine is overly expensive I found ordering parts from cpproformence is cheaper with great help
    Last edited by lefty's pride; 11-15-2009 at 07:50 PM.
    "Horsepower sells Engines but torque wins races."
    "winners never quit, quitters never win
    those who never win and never quit are idiots"
    "if at first you don't succeed redefine success"
    "why is there never time to do it right, but there is aways time to do it twice"

  11. #9
    Senior Member jetboatperformance's Avatar
    Join Date
    Dec 2007
    Location
    Atascadero Calif
    Posts
    7,464

    Default

    Quote Originally Posted by lefty's pride View Post
    ok im running a 1979 454 casting #361959 stock, with the older heads on it cast #353049 again all stock. aslo a 850 holly i know it is way to big. i got a 650 holly double pumper to replace it for next year help with that low end power. i do beleave im down on a little power with a bit of blow by. but looking on the net i dont find many sites say i have more than 250hp and on that old cart the rpm with the a cut impeller it puts me rith in that area.
    actually an 850 would be fine and Let me know if we can help as you go thru the diagnostics Tom

  12. #10
    Horsepower sells Engines lefty's pride's Avatar
    Join Date
    Nov 2009
    Location
    Langley, B.C. Canada
    Posts
    402

    Default

    Well and maybe im running a little higher in rpm but it cant be more than 4000 rpm I don’t think that an 850 is good for the application turning the motor at 4000 rpm using a 850 cfm carb I’m told I would need a volumetric efficiency of 135% because I’m not adding a blow nor am I going to turn over 6000 rpm I’m just not going to need that large of a car. Plus I have heard from many people and from Kershaw performance I was told to run a smaller carb it would help with low-end power and with fuel economy
    Last edited by lefty's pride; 11-15-2009 at 08:24 PM.
    "Horsepower sells Engines but torque wins races."
    "winners never quit, quitters never win
    those who never win and never quit are idiots"
    "if at first you don't succeed redefine success"
    "why is there never time to do it right, but there is aways time to do it twice"

  13. #11
    northern member Canuc's Avatar
    Join Date
    Jan 2008
    Location
    Nechako
    Posts
    602

    Default

    glad you got the parts thing figured out so what impeller do you have ? if you want to keep your motor lugged down for economy then the 650 dp would work good for you . the log manifolds you have would be better for low rpm aswell .
    Quote Originally Posted by gn7 If your ran a cammer your odds of finishing WERE ZERO.

  14. #12
    Horsepower sells Engines lefty's pride's Avatar
    Join Date
    Nov 2009
    Location
    Langley, B.C. Canada
    Posts
    402

    Default

    Do you think Im loosing with the log style manifolds? I don’t really want to run a stack Im trying to keep people around me happy since there all family at the lake and Im running A cut impeller. Id like to turn more rpm if I could I figured I cold hold 3500 for a long time with out hurting the engine but if I could turn more I would I think I could turn up to 4500 but nothing more with the stock rotating assembly
    "Horsepower sells Engines but torque wins races."
    "winners never quit, quitters never win
    those who never win and never quit are idiots"
    "if at first you don't succeed redefine success"
    "why is there never time to do it right, but there is aways time to do it twice"

  15. #13
    northern member Canuc's Avatar
    Join Date
    Jan 2008
    Location
    Nechako
    Posts
    602

    Default

    logs are fine for what your doing , and they will help to keep you in with the neighbors . Like Tom said check tach , your rpm's are low for 454 with a A impeller .
    Quote Originally Posted by gn7 If your ran a cammer your odds of finishing WERE ZERO.

  16. #14
    Senior Member GT Jets's Avatar
    Join Date
    Jun 2008
    Location
    Morgan Hill
    Posts
    2,234

    Default

    Quote Originally Posted by Canuc View Post
    logs are fine for what your doing , and they will help to keep you in with the neighbors . Like Tom said check tach , your rpm's are low for 454 with a A impeller .
    Just throwing this out there, these guys ar giving you sound advice..

    If you're looking to get the boat to run well while still getting some economy and you're gonna stick with the logs, I would recommend a 750 CFM spread bore vacuum secondary carb, they take a little tweaking, but have better part throttle fuel economy and it is there when you want to "blow out the cobwebs"...

    You need to shoot for 4500 RPM at WOT, really for a few reasons. The first reason would be to prevent overloading the engine, if you're running WOT and only getting 3500-4000 rpm the strain on everything is huge and unnecissary, the second is pump efficiency, an A impeller works super duper well at 4500 RPM, if power will be that low (250+/-) maybe cut you're stuff down to a B (not recommended on a big block).

    650 CFM IMHO is pretty small and if you're going to go that route, why not switch to a small block? I would be willing to bet you could find a killer trade and the boat would lose 200# in the process.

    The older impeller designs were rated at 330 or so HP, but with the advances in alloys and machining practices, that number has improved greatly. With your setup, you really can't beat an aluminum wheel.

    Lastly, you would have to have some extreme hull/intake problems to cavitate an A at 4000 RPM. you should be OK there.

    GT
    GT


    Quote Originally Posted by Quickjet View Post
    Put a 300 on the back of it, Flywheel it and a nosecone. $15,000 later you'll have a 65 mph pile of shit......

+ Reply to Thread
Page 1 of 4 1 2 3 4 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


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