Guess my Horsepower BBC
+ Reply to Thread
Page 1 of 9 1 2 3 4 ... LastLast
Results 1 to 14 of 121

Thread:
Guess my Horsepower BBC

  1. #1
    Senior Member 74Bonneville's Avatar
    Join Date
    Jan 2013
    Location
    Magic Mountain CA
    Posts
    542

    Default Guess my Horsepower BBC

    I'm not going to Dyno this anytime soon and was wondering if anyone here has a similar build or the experience to give me their opinion.

    BBC 468
    4 Bolt Main
    Forged Crank
    GM heavy Duty 7/16 Rods
    Clevite Main & Rod Bearings. MS829H – CB743HN
    Hamburgers 10 qt Oil Pan with Mellings HV Pump
    JE Flat Top Pistons & Rings 8.1 Compression
    (Bore & Ring gap spec’s to Bob Teague’s Recommendation) (Machine work at Adam’s Metalizing in Lancaster)
    Comp Cam 11-568-4 Nitrous HP Lift 284/305, Intake 575, Exhaust 595, 113 lobe separation.
    Comp Valve Springs 924-16 (2800rpm – 6800rpm)

    Comp Pro Magnum Lifters Hydraulic Flat Tappet
    Iron Square Port Heads with Ports cleaned up
    Teague 1.7 Roller Rockers
    Manley Push Rods
    Edlebrock Victor Jr Intake Port Matched
    M3 Pro Charger with Intercooler pushing 9 psi.
    QFT blow through carb 750 cfm. (Carb good to 1000hp per QFT)(Jetting 85 & 95)
    Fuel system designed for this application.

    MSD Ignition
    Basset Headers

    I have a thread going on in jet boat section about next impeller. Runs 86mph on GPS at 5200 rpm.

    Thanks!
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Procharger2.jpg 
Views:	52 
Size:	22.8 KB 
ID:	277258   Click image for larger version. 

Name:	Procharger3.jpg 
Views:	53 
Size:	25.4 KB 
ID:	277266  
    Last edited by 74Bonneville; 04-30-2013 at 04:20 PM.

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    steelcomp was here
    Join Date
    Dec 2007
    Location
    n/e TN
    Posts
    26,280

    Default

    Any flow numbers?
    IMO you have way too much ex lobe on this deal. Lot of power going out the ex pipe.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  4. #3
    Senior Member SHAWN DAVIS's Avatar
    Join Date
    Jan 2012
    Location
    lake Charles, Louisiana
    Posts
    640

    Default

    I'll guess 700-725

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Senior Member 74Bonneville's Avatar
    Join Date
    Jan 2013
    Location
    Magic Mountain CA
    Posts
    542

    Default

    Quote Originally Posted by steelcomp View Post
    Any flow numbers?
    IMO you have way too much ex lobe on this deal. Lot of power going out the ex pipe.
    All I have is the parts list. Cam decision was made by Comp cams techs, I called and gave them this info and they suggested what I have. Engine runs really strong.

  7. #5
    Senior Member
    Join Date
    May 2009
    Location
    WV
    Posts
    411

    Default

    Quote Originally Posted by 74Bonneville View Post
    I'm not going to Dyno this anytime soon and was wondering if anyone here has a similar build or the experience to give me their opinion.

    BBC 468
    4 Bolt Main
    Forged Crank
    GM heavy Duty 7/16 Rods
    Clevite Main & Rod Bearings. MS829H – CB743HN
    Hamburgers 10 qt Oil Pan with Mellings HV Pump
    JE Flat Top Pistons & Rings 8.1 Compression
    (Bore & Ring gap spec’s to Bob Teague’s Recommendation) (Machine work at Adam’s Metalizing in Lancaster)
    Comp Cam 11-568-4 Nitrous HP Lift 284/305, Intake 575, Exhaust 595, 113 lobe separation.
    Comp Valve Springs 924-16 (2800rpm – 6800rpm)

    Comp Pro Magnum Lifters Hydraulic Flat Tappet
    Iron Square Port Heads with Ports cleaned up
    Teague 1.7 Roller Rockers
    Manley Push Rods
    Edlebrock Victor Jr Intake Port Matched
    M3 Pro Charger with Intercooler pushing 9 psi.
    QFT blow through carb 750 cfm. (Carb good to 1000hp per QFT)(Jetting 85 & 95)
    Fuel system designed for this application.

    MSD Ignition
    Basset Headers

    I have a thread going on in jet boat section about next impeller. Runs 86mph on GPS at 5200 rpm.

    Thanks!
    865Hp 785Tq

  8. #6
    Some guy obnoxious001's Avatar
    Join Date
    Dec 2007
    Posts
    3,571

    Default

    Quote Originally Posted by 74Bonneville View Post
    I'm not going to Dyno this anytime soon and was wondering if anyone here has a similar build or the experience to give me their opinion.

    BBC 468
    4 Bolt Main
    Forged Crank
    GM heavy Duty 7/16 Rods
    Clevite Main & Rod Bearings. MS829H – CB743HN
    Hamburgers 10 qt Oil Pan with Mellings HV Pump
    JE Flat Top Pistons & Rings 8.1 Compression
    (Bore & Ring gap spec’s to Bob Teague’s Recommendation) (Machine work at Adam’s Metalizing in Lancaster)
    Comp Cam 11-568-4 Nitrous HP Lift 284/305, Intake 575, Exhaust 595, 113 lobe separation.
    Comp Valve Springs 924-16 (2800rpm – 6800rpm)

    Comp Pro Magnum Lifters Hydraulic Flat Tappet
    Iron Square Port Heads with Ports cleaned up
    Teague 1.7 Roller Rockers
    Manley Push Rods
    Edlebrock Victor Jr Intake Port Matched
    M3 Pro Charger with Intercooler pushing 9 psi.
    QFT blow through carb 750 cfm. (Carb good to 1000hp per QFT)(Jetting 85 & 95)
    Fuel system designed for this application.

    MSD Ignition
    Basset Headers

    I have a thread going on in jet boat section about next impeller. Runs 86mph on GPS at 5200 rpm.

    Thanks!
    If you know the impeller size, shouldn't you be able to find a chart that gives you horsepower based on RPM?

  9. #7
    Senior Member 74Bonneville's Avatar
    Join Date
    Jan 2013
    Location
    Magic Mountain CA
    Posts
    542

    Default

    Quote Originally Posted by obnoxious001 View Post
    If you know the impeller size, shouldn't you be able to find a chart that gives you horsepower based on RPM?
    I would think so, but how would it be accurate with so many different types of boats? I've been speaking with Duane at HTP and he does have charts that he has been referring too. We're going with an educated guess of 750hp. New impeller on the way.

    I like JSspeeddemon's guess, I was thinking 800 or so before I started speaking with those who know way more than I do.

    If I had the funds a set of AFR heads, matching intake & a bigger cam would let this thing breath, someday

    Thanks again for everyone's help, I like this site

  10. #8
    steelcomp was here
    Join Date
    Dec 2007
    Location
    n/e TN
    Posts
    26,280

    Default

    Quote Originally Posted by 74Bonneville View Post
    I would think so, but how would it be accurate with so many different types of boats? I've been speaking with Duane at HTP and he does have charts that he has been referring too. We're going with an educated guess of 750hp. New impeller on the way.

    I like JSspeeddemon's guess, I was thinking 800 or so before I started speaking with those who know way more than I do.

    If I had the funds a set of AFR heads, matching intake & a bigger cam would let this thing breath, someday

    Thanks again for everyone's help, I like this site
    What impeller are you running and what rpm are you seeing?
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  11. #9
    Senior Member MBMoseBilt's Avatar
    Join Date
    Apr 2008
    Posts
    132

    Default

    500 HP at best.

    Just kidding. Gm crank and rods. 700 HP.

    Would have no idea without knowing your flow rates and compressor size.


    Sent from my iPhone using Tapatalk

  12. #10
    Senior Member 74Bonneville's Avatar
    Join Date
    Jan 2013
    Location
    Magic Mountain CA
    Posts
    542

    Default

    Quote Originally Posted by steelcomp View Post
    What impeller are you running and what rpm are you seeing?
    Heritage aluminum AA - 5200rpm - GPS 86mph - Yes I know aluminum not good for this, but didn't want to invest in high end impeller until I ran it a few times

  13. #11
    steelcomp was here
    Join Date
    Dec 2007
    Location
    n/e TN
    Posts
    26,280

    Default

    Quote Originally Posted by 74Bonneville View Post
    Heritage aluminum AA - 5200rpm - GPS 86mph - Yes I know aluminum not good for this, but didn't want to invest in high end impeller until I ran it a few times
    AA @ 5200 puts you right about 550-560hp at the impeller, in that weather, on that day.
    Last edited by scott foxwell; 05-01-2013 at 10:12 AM.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  14. #12
    Senior Member bp298's Avatar
    Join Date
    Dec 2007
    Location
    LHC
    Posts
    6,573

    Default

    Quote Originally Posted by 74Bonneville View Post
    Heritage aluminum AA - 5200rpm - GPS 86mph - Yes I know aluminum not good for this, but didn't want to invest in high end impeller until I ran it a few times
    what's your goal with this thing? what do you use it for? you said you're getting another impeller, what is it?

    as a wild ass guess, i'd say 600-650 absorbed. at that rpm. you're going with a different impeller, but without a dyno sheet there's no real way to know how much performance improvement you'll see, whether it's larger or smaller. 600-650 at 5200 is a pretty good number. and if an impeller were to allow rpm to run higher, performance may improve IF the engine is making more hp at higher rpm. but without a curve to tell you that, it's just a guess.
    Last edited by bp298; 05-01-2013 at 09:32 AM.

  15. #13
    Senior Member EVILFORCE's Avatar
    Join Date
    Oct 2009
    Posts
    5,180

    Default

    My guess is apx 550 hp. But I dont know chit.

  16. #14
    steelcomp was here
    Join Date
    Dec 2007
    Location
    n/e TN
    Posts
    26,280

    Default

    Quote Originally Posted by steelcomp View Post
    AA @ 5200 puts you right about 550-560hp at the impeller, in that weather, on that day.
    Edited to add: That's per Jack Sea's chart. Duane's chart shows ~500hp for an A @ 5200, so that's a pretty good confirmation on the 550-560 for a AA. Corrected power would depend on the weather that day.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

+ Reply to Thread
Page 1 of 9 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

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