Dyno proven 675-700 HP 540CI recipes?
07-20-2015, 10:35 PM
#101
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tim,a day on the dyno will tell the story.when the season is over bring me one engine and we will know for sure what the story is.
07-20-2015, 10:53 PM
#102
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07-21-2015, 09:45 PM
#104
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I didn't dyno due to time and money, but my combo is this, 540CI 9.6:1 with AFR 325 heads with CNC bowl and chamber, cam is 241/[email protected] and 681/663 lift on 112, Johnson lifters, 1.7 Scorpion rockers, single plane intakes and 1050 Quick fuel carbs.... this combo should EASILY be making 650+ HP and enough TQ to carry my heavy Mistress to at least the same speeds I saw with old power and more... but that's not happening....
old combo was 565 CI with 9.5:1 and 320CC pro comps, cams were 236/[email protected] and .578/.578 on 114, stock gm lifters, erson rockers 1.7, same intakes and my HP500 carbs (800's) boat easily went 73.5 @5500 all day long never skipped a beat until it tossed a rod, now those engines had tons of issues but somehow made power that I just don't have anymore....they dynode at 598HP@5200 and 661TQ@4400 and carried boat to 5500 rpm easily.....
old combo was 565 CI with 9.5:1 and 320CC pro comps, cams were 236/[email protected] and .578/.578 on 114, stock gm lifters, erson rockers 1.7, same intakes and my HP500 carbs (800's) boat easily went 73.5 @5500 all day long never skipped a beat until it tossed a rod, now those engines had tons of issues but somehow made power that I just don't have anymore....they dynode at 598HP@5200 and 661TQ@4400 and carried boat to 5500 rpm easily.....
What oil pans are you running? I've seen a couple engine puke out around 5500 because of the lifters. Adding a 1/2-1qt more oil some times took care of it. (keep an eye on aerating the oil)
07-21-2015, 09:57 PM
#105
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Location: Olmsted Falls,Ohio Marblehead,Oh
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didn't make more power I don't think, it's more about the TQ and where these make the power.... over my old ones... Cigrocket made 680 hp on the dyno, spun 27 Mirage to 5350 @74-75 mph, with very similar engines and the same hull and TRS, I am at 72.5 so far @5400, so I am close, I am gonna keep playing with it and keep tuning... I have 12QT pans, no oiling issues lol
This is hurts to read this. A 565 w/ ProComp heads makes more power than a 540 w/ AFR heads and CNC work. There has to be something going on.
What oil pans are you running? I've seen a couple engine puke out around 5500 because of the lifters. Adding a 1/2-1qt more oil some times took care of it. (keep an eye on aerating the oil)
What oil pans are you running? I've seen a couple engine puke out around 5500 because of the lifters. Adding a 1/2-1qt more oil some times took care of it. (keep an eye on aerating the oil)
Last edited by Full Force; 07-21-2015 at 10:08 PM.
07-21-2015, 10:51 PM
#106
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OK, Mild Thunder Joe may be onto something to look at..... I bought pans I could never identify, I figured 12 qt pans, buddy I got them from said 10, today I changed oil and had to add 13qts to read full on sticks, but I guess I just trusted they were accurate, they may not be.... and I might have way too much oil causing the crank to grab oil.... so my whole system with cooler and lines probably has 15qts I bet... this "could" be my issue, I doubt I am that lucky but its easy to suck out 2 qts and try it....hmmmmm
link is thread with my pan pics.... never did find out whos they are...
thttp://www.offshoreonly.com/forums/general-q/321612-what-oil-pan-gen6-bbc.html?highlight=
link is thread with my pan pics.... never did find out whos they are...
thttp://www.offshoreonly.com/forums/general-q/321612-what-oil-pan-gen6-bbc.html?highlight=
07-22-2015, 12:03 AM
#107
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If your cranks are splashing in the pool, wouldnt that aerate the mess into a a bubblebath and negatively effect lubrication?? you would see aerated oil as a drop in oil pressure?? Mind you this is random musings of an inquisitive mind, not actual experience...
