Howards cams for Blown Fuel Injected application?
+ Reply to Thread
Page 1 of 2 1 2 LastLast
Results 1 to 14 of 28

Thread:
Howards cams for Blown Fuel Injected application?

  1. #1
    280 Profile Cat W/575sci JRider's Avatar
    Join Date
    Mar 2008
    Location
    Lansing MI / Deerwood MN
    Posts
    204

    Default Howards cams for Blown Fuel Injected application?

    I am looking for a suitable cam for my 502. It has dual throttle body injection 720cfm each on top of a whipple intercooler, 871 stripped Littlefield with closed discharge and AFR 325 heads. With flat tops and headgasket selection I should be at 8.5:1. I am looking to have about 8 lbs boost and would like to turn it 6000. I am looking at Howard's cams 120206-14 specs 286/298 233/245 .634/.635 114ls 110icl. 2500-6300 suggested operating rpm. Any suggestions?

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Senior Member
    Join Date
    May 2009
    Location
    WV
    Posts
    411

    Default

    What is the application you are putting this motor in? That cam .050 duration is pretty mild compared to several I've used in blown injected, even in I/O applications.
    Last edited by Jspeeddemon; 06-30-2013 at 09:20 PM.

  4. #3
    Senior Member ol guy's Avatar
    Join Date
    Mar 2008
    Location
    Lake Elsinore Ca
    Posts
    3,812

    Default

    Quote Originally Posted by JRider View Post
    I am looking for a suitable cam for my 502. It has dual throttle body injection 720cfm each on top of a whipple intercooler, 871 stripped Littlefield with closed discharge and AFR 325 heads. With flat tops and headgasket selection I should be at 8.5:1. I am looking to have about 8 lbs boost and would like to turn it 6000. I am looking at Howard's cams 120206-14 specs 286/298 233/245 .634/.635 114ls 110icl. 2500-6300 suggested operating rpm. Any suggestions?
    I will say the choice you have made is okay but before I say more I would call Howards and talk to Scott on the info line! I would go with their deal and advise long before reading or choosing something else!!! The only one I would recommend other is not easy to reach and stays away from the soup! The most educated man on cam design I ever met!!!! Stay with Howards and listen!!! They know what they are doing! Good luck! .

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    280 Profile Cat W/575sci JRider's Avatar
    Join Date
    Mar 2008
    Location
    Lansing MI / Deerwood MN
    Posts
    204

    Default

    Quote Originally Posted by ol guy View Post
    I will say the choice you have made is okay but before I say more I would call Howards and talk to Scott on the info line! I would go with their deal and advise long before reading or choosing something else!!! The only one I would recommend other is not easy to reach and stays away from the soup! The most educated man on cam design I ever met!!!! Stay with Howards and listen!!! They know what they are doing! Good luck! .
    I talked with Scott today and he actually recommended what I had already chosen! I am still open to more suggestions!

  7. #5
    280 Profile Cat W/575sci JRider's Avatar
    Join Date
    Mar 2008
    Location
    Lansing MI / Deerwood MN
    Posts
    204

    Default

    Quote Originally Posted by Jspeeddemon View Post
    What is the application you are putting this motor in? That cam .050 duration is pretty mild compared to several I've used in blown injected, even in I/O applications.
    It is in an 28' profile cat with Bravo XR outdrive.

  8. #6
    New here Beer:30's Avatar
    Join Date
    Feb 2008
    Location
    Bakersfield, CA
    Posts
    4,219

    Default

    Quote Originally Posted by JRider View Post
    I talked with Scott today and he actually recommended what I had already chosen! I am still open to more suggestions!
    What else are you wanting? If the cam supplier recommends the cam you already have for your application and engine - what's left? It sure seems like a great setup on paper, but the only way to REALLY tell is either strap it to a dyno or put it in the boat and see how it performs.

    But again, on paper, it looks like a great choice of cam. Unless we have a cam BUILT to certain specs - custom - we are all guessing (somewhat) that a specific cam will work qreat with a given build.
    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.

  9. #7
    280 Profile Cat W/575sci JRider's Avatar
    Join Date
    Mar 2008
    Location
    Lansing MI / Deerwood MN
    Posts
    204

    Default

    Quote Originally Posted by Beer:30 View Post
    What else are you wanting? If the cam supplier recommends the cam you already have for your application and engine - what's left? It sure seems like a great setup on paper, but the only way to REALLY tell is either strap it to a dyno or put it in the boat and see how it performs.

    But again, on paper, it looks like a great choice of cam. Unless we have a cam BUILT to certain specs - custom - we are all guessing (somewhat) that a specific cam will work qreat with a given build.
    Well, I am no expert by any means.

    I have found another cam 240/[email protected] .642/.642 114ls 110icl. It has a slight amount more lift and more intake duration....with a blower and the large size of the intake port am I going to get more cylinder fill than the above howards cam? This is why I am asking for more input.

  10. #8
    gn7
    gn7 is offline
    Senior Member gn7's Avatar
    Join Date
    Jan 2008
    Posts
    25,975

    Default

    Picking a cam for a recreational boat based on dyno data is like throwing darts in the dark at 2" dart board.
    99.9% of all the dyno sheets you see are 100% full throttle torque readings at various chosen RPMs acrossed a given range. They tell zip squat about the drivability of a given engine package. Perfect for determing a race package, not a recreational boat the size of a small tug.

    You would need reams of graphs and dozens of throttle positions to determine that. Testing on a Eddy Current dyno with a computer program like Mercury does will tell you just about everything you could ever need to know. The average Superflow dyno session will tell you how it will accelerate and the top speed with some calculations.

    Is that cam the perfect choice for top speed and/or accelration for that engine? Not even close!!
    But I bet that who ever Scott at Howards is picked that cam for a good reason. Its SAFE. It will probably have decent manners at less than WOT, and moderate RPM, and not cause some undue problems with water reversion with the right exhaust system.

    Could I kick its ass on a dyno with a different cam? In a heart beat, in a dark room with a dart board. I had a cam in my GN in a 496 stroker before we started racing it that would crush that thing on a dyno. But it had dry headers and we ran the dog shit out the thing and could careless what it acted like at 3000 Rs part throttle. I only cared what it did when I mashed the pedal at 3000 Rs.
    Would I suggest a different cam for the OPs use? Nope. I'd play it safe as well.



    100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3
    Last edited by gn7; 07-01-2013 at 09:48 AM.

  11. #9
    New here Beer:30's Avatar
    Join Date
    Feb 2008
    Location
    Bakersfield, CA
    Posts
    4,219

    Default

    It would be my opinion that any MORE cam would start to take away docking/trailing manners. Nothing horrible, but it really depends on you END result of the powertrain. Do you want ALL OUT, stick-pinned, WFO most of the time, every last HP? Or do you want to leave a little bit of top end on the table and keep manners? If you family boat some/most of the time - I would stick with the cam you were first talking about.

    With a power-adder, you don't need to worry about stuffing the cylinders. It's gonna do that for you. You more want to think of how to USE what's been stuffed.
    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.

  12. #10
    gn7
    gn7 is offline
    Senior Member gn7's Avatar
    Join Date
    Jan 2008
    Posts
    25,975

    Default

    Quote Originally Posted by Beer:30 View Post

    With a power-adder, you don't need to worry about stuffing the cylinders. It's gonna do that for you. You more want to think of how to USE what's been stuffed.
    You sound like Unchained. That right there could only be written by somebody who is clueless.
    When you guys start looking at boosted engines the same as unboosted you may get a clue.



    100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3

  13. #11
    New here Beer:30's Avatar
    Join Date
    Feb 2008
    Location
    Bakersfield, CA
    Posts
    4,219

    Default

    Quote Originally Posted by gn7 View Post
    You sound like Unchained. That right there could only be written by somebody who is clueless.
    When you guys start looking at boosted engines the same as unboosted you may get a clue.
    Thanks dad.
    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.

  14. #12
    steelcomp was here
    Join Date
    Dec 2007
    Location
    n/e TN
    Posts
    26,269

    Default

    Quote Originally Posted by JRider View Post
    I am looking for a suitable cam for my 502. It has dual throttle body injection 720cfm each on top of a whipple intercooler, 871 stripped Littlefield with closed discharge and AFR 325 heads. With flat tops and headgasket selection I should be at 8.5:1. I am looking to have about 8 lbs boost and would like to turn it 6000. I am looking at Howard's cams 120206-14 specs 286/298 233/245 .634/.635 114ls 110icl. 2500-6300 suggested operating rpm. Any suggestions?
    Probably not a bad cam. It is safe. One thing, with those heads on that engine you don't need a lot of cam.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  15. #13
    280 Profile Cat W/575sci JRider's Avatar
    Join Date
    Mar 2008
    Location
    Lansing MI / Deerwood MN
    Posts
    204

    Default

    Quote Originally Posted by gn7:2350025
    Picking a cam for a recreational boat based on dyno data is like throwing darts in the dark at 2" dart board.
    99.9% of all the dyno sheets you see are 100% full throttle torque readings at various chosen RPMs acrossed a given range. They tell zip squat about the drivability of a given engine package. Perfect for determing a race package, not a recreational boat the size of a small tug.

    You would need reams of graphs and dozens of throttle positions to determine that. Testing on a Eddy Current dyno with a computer program like Mercury does will tell you just about everything you could ever need to know. The average Superflow dyno session will tell you how it will accelerate and the top speed with some calculations.

    Is that cam the perfect choice for top speed and/or accelration for that engine? Not even close!!
    But I bet that who ever Scott at Howards is picked that cam for a good reason. Its SAFE. It will probably have decent manners at less than WOT, and moderate RPM, and not cause some undue problems with water reversion with the right exhaust system.

    Could I kick its ass on a dyno with a different cam? In a heart beat, in a dark room with a dart board. I had a cam in my GN in a 496 stroker before we started racing it that would crush that thing on a dyno. But it had dry headers and we ran the dog shit out the thing and could careless what it acted like at 3000 Rs part throttle. I only cared what it did when I mashed the pedal at 3000 Rs.
    Would I suggest a different cam for the OPs use? Nope. I'd play it safe as well.
    I was concerned about overcamming for what my motor is and only turning it 6000...so why have a cam that turns to 6300? I would like to see 800hp out of it. I didnt want to make it a turd like an overcammed NA motor.
    Last edited by JRider; 07-01-2013 at 01:40 PM.

  16. #14
    Senior Member MACHINEHEAD1's Avatar
    Join Date
    May 2008
    Posts
    473

    Default

    What exhaust valves you got. Lookin' at those cam specs, 114-fairly aggressive lobes-kinda small cam. Might get your EGTs up. You could make 800 with this thing and that smaller cam. Would be great around the docks and trailer. It would be done at about 5800 though. If you are looking for 800 at 6000. I would go to a little less aggressive lobe (easy on your valvetrane)- up a couple at .050" and depending on final overlap, maybe a 110-112lda.

+ 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