Cam Suggestions for a 540
10-09-2015 | 11:46 AM
#62
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From: Olmsted Falls,Ohio Marblehead,Oh
My old engines 565 CI with 236/[email protected] lift on a 114, 598hp@5200 and 661tq@4400, those engines would still be going strong if it did not spit a rod They peaked out at 5200 they went 5500 in my boat and ran really good and reliable until it's been a rotten I did not build them they had a lot of junk parts in them but they made good power and excellent torque
10-09-2015 | 12:09 PM
#63
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From: Calgary, AB
My old engines 565 CI with 236/[email protected] lift on a 114, 598hp@5200 and 661tq@4400, those engines would still be going strong if it did not spit a rod They peaked out at 5200 they went 5500 in my boat and ran really good and reliable until it's been a rotten I did not build them they had a lot of junk parts in them but they made good power and excellent torque
10-09-2015 | 12:30 PM
#64
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Joined: Oct 2005
Posts: 11,691
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From: Olmsted Falls,Ohio Marblehead,Oh
Pro comp, I bought those engines done out of a different boat and had to do lots to make them live 2 seasons (low oil pressures, rework heads with inconel) things like that but they pushed my heavy mistress very easy
Had all Chinese parts and stayed together valvetrain wise for 2 seasons I had them and I abuse things very hard.
Had all Chinese parts and stayed together valvetrain wise for 2 seasons I had them and I abuse things very hard.
10-11-2015 | 11:46 AM
#67
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From: Calgary, AB
I did.
"The low lift profiles were designed for street and marine use. The low lift adds dependability and reliability for extend-
ed use applications. The high lift versions of the hydraulic rollers are designed for all out applications where high lift
is desired because of cylinder head or engine modifications. They function well for street and strip. These lobes run
well in big cubic inch marine engines."
Crane also has a 680 lift 244 grind they say is ok for a marine application.
Anyone running 680, 700 lift hyd cams going 300 hours on their valvetrains? I know its done everyday with .360 lobes. Anyone doing it with .400+ lobes ?
theres a reason a stock GM roller big block with a whopping .483 lift, can go 1500 hours, and a .612-.630 merc only goes 300 hours or so? Safe to assume increasing lift adds power, while reducing valvetrain life generally?
How much power is gained even with 335 afrs, by going from a .370 lobe to a .400 lobe? How much of a reduction in valvetrain life ? How much faster will the boat go?
"The low lift profiles were designed for street and marine use. The low lift adds dependability and reliability for extend-
ed use applications. The high lift versions of the hydraulic rollers are designed for all out applications where high lift
is desired because of cylinder head or engine modifications. They function well for street and strip. These lobes run
well in big cubic inch marine engines."
Crane also has a 680 lift 244 grind they say is ok for a marine application.
Anyone running 680, 700 lift hyd cams going 300 hours on their valvetrains? I know its done everyday with .360 lobes. Anyone doing it with .400+ lobes ?
theres a reason a stock GM roller big block with a whopping .483 lift, can go 1500 hours, and a .612-.630 merc only goes 300 hours or so? Safe to assume increasing lift adds power, while reducing valvetrain life generally?
How much power is gained even with 335 afrs, by going from a .370 lobe to a .400 lobe? How much of a reduction in valvetrain life ? How much faster will the boat go?
After reading and digesting the info in the comp cams custom grind catalogue and plugging some numbers into dynosim the crane 741 gets me where very close to where I want to be . Just wondering if I play with more duration and less lift if I can get the same power and be easier on the valve train.
10-11-2015 | 04:43 PM
#69
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Joined: Aug 2011
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From: bel air, md
