Cant get RPM out of a 454, 330hp
07-27-2010, 09:12 PM
#41
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Good luck hopefully you only blew a head gasket on the 454.
07-28-2010, 07:07 AM
#42
you sound like you have my old problem. I have a gen 5 engine (1992 build) it had a flat tappet cam. They took alot of the zinc and phosphorous materials out of standard oils. those additives made it easier on the cam and flat tappet assys. i kept running less and less pitch. the boat kept going slower and slower. tore the engine down for a build up and found (count them!) 5! 5 flat lobes. i wanted to scream! when i got it to the machinist we both sat there and guess horsepower with a cam like that... we both know it couldnt be over 200. you need to retro-fit over to a haydraulic roller setup. Bob Madera can help you there. im sure your engine needs freshening up. and from here on out run race oil.
I got all the way down to an outboard vensura 19p 4 blade prop. i think it had a 13.5 diameter. compared to the props i am running now.... itys little. the holeshot was crap and i got 49 mpg out of it at the end of that season. pretty sad.... i got 74 once this year with a Bob Madera engine!
I got all the way down to an outboard vensura 19p 4 blade prop. i think it had a 13.5 diameter. compared to the props i am running now.... itys little. the holeshot was crap and i got 49 mpg out of it at the end of that season. pretty sad.... i got 74 once this year with a Bob Madera engine!
07-28-2010, 09:20 AM
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07-28-2010, 10:24 AM
#44
08-11-2010, 07:18 AM
#45
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so i got the motor back together. I put on an air gap intake, edelbrock carb and a new head. re adjusted my valves. Checked comp and all cyl are 130+. Still getting 3800 rpm!?!? I got my advanced timing set at 32*. I am lost now.
Can it be the drive? I read somewhere that BBC alpha combos cam with the 1.32 gears to put less stress on the drive? I will go buy a 1.50 if you guys thinks that the problem, there all over cragslist. Over the winter i am thinking of upgrading to bravo.
Can it be the drive? I read somewhere that BBC alpha combos cam with the 1.32 gears to put less stress on the drive? I will go buy a 1.50 if you guys thinks that the problem, there all over cragslist. Over the winter i am thinking of upgrading to bravo.
08-11-2010, 08:56 PM
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i had bad gauges. last year i was running a 500hp and i thought i was getting 5600rpm with a 24p bravo1 4 balde with a 1.36 drive. guess what i was wrong. i got a 1.50 drive now and 570plus hp with a marine kinetics (bob madera) engine. running in the low 70s with that same prop. that 24p bravo1 and running 5500-5600 with a new set of livorsi gauges. plaining is amazing and the boat is better than ever.
also, if i had the correct gauges i would have known my WOT rpm was low. i would have propped it correctly and gone from there. which is what i reccomend from here. prop it right and you will be happy as long as you have no base engine issues.
happy boating buddy and i really hope you get her whipped.
