If this is your first visit, please click the Sign Up now button to begin the process of creating your account so you can begin posting on our forums! The Sign Up process will only take up about a minute of two of your time.

Follow us on Facebook Follow us on Twitter
Results 1 to 4 of 4
  1. #1
    My Boats:
    Velocity 30ft
    Join Date
    Jul 2001
    Melbourne, Florida

    How much boost are merc SC engines running

    Just doing a little reading on supercharging and am wondering what is the industry standard if there are any, on how much boost to safely run for reliability of a performance marine engine.

    I went online and checked a HP calculator, and you can get very impressive gaines running a 2 core intercooler and 10 LBS of boost. But how long will it last? What are merc or sterling or any other big builder running. Is there a standard and what are the pro's and cons of higher and lower boost beside the HP trade off.

    And lastly, is it always imperative to run an intercooler or could you run a very large supercharger like an 8-71 on a built SBC and maintain high boost (8-10) and keep low intake temps by slowing the big blower down since its so big?

  2. #2
    Charter Member # 55 Charter Member Griff's Avatar
    My Boats:
    ..........32........... Active Thunder
    Join Date
    Oct 2000
    Don't know about a lot of questions, but here are some factory engine/boost specs for some SC'd Merc engines.

    525SC--454 ci--Wieand 177 blower @ 5.5 lbs boost
    600SC--502 ci--B&M 420 Mega blower @ 6 lbs boost
    800SC--572 ci--B&M 420 Mega blower @ 8 lbs boost

  3. #3
    Platinum Member Platinum Member mcollinstn's Avatar
    My Boats:
    1991 F311SR1
    Join Date
    Sep 2001
    The 575SCi's in the Spectre I rode in spun 5100rpm but never showed more than 5 pounds on the Gaffrig.
    I see London, I see France...

  4. #4
    Registered khadley's Avatar
    My Boats:
    1998 Eliminator 33 Daytona
    Join Date
    Dec 2000
    west harrison IN United States of America
    my stock 600 sc's made 4.5 lbs of boost

Similar Threads

  1. Blower boost,Merc 600 SCi
    By Magicfloat in forum General Q & A
    Replies: 8
    Last Post: 06-28-2008, 03:55 PM
  2. Replies: 4
    Last Post: 08-22-2006, 10:19 PM
  3. Engines Running Different RPMs
    By Chicago290 in forum General Q & A
    Replies: 11
    Last Post: 04-20-2006, 08:57 AM
  4. How Those New Engines Running?
    By IndianaHeat in forum General Boating Discussion
    Replies: 5
    Last Post: 07-23-2005, 06:15 PM
    By fastlane40 in forum General Q & A
    Replies: 8
    Last Post: 02-22-2005, 10:34 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
All times are GMT -5. The time now is 08:56 PM.
Powered by vBulletin® Version 4.2.0
Copyright © 2016 vBulletin Solutions, Inc. All rights reserved.
Search Engine Optimization by vBSEO 3.6.1
Original Poster In Postbit provided by Original Poster In Postbit v1.0.0 (Free) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
Copyright 2011 OffShoreOnly. All rights reserved.