cam choice?
08-31-2004, 07:51 AM
#1
Charter Member #655
Charter MemberThread Starter
cam choice?
I know the crane 731 and 741 get great press for a Hydr. roller but what about a hydr. flat tappet thats close? anyone.......
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08-31-2004, 08:05 AM
#2
MarineKinetics
Platinum Member
Re: cam choice?
Dyno,
You can only get so close due to the limitation of the ramp angles on a flat vs a roller. If you are sold on a hyd flat you do have the option of increasing the lifter diameter, but it's hard to justify the expense, or you can have a flat custom ground to your combination.
Bob
You can only get so close due to the limitation of the ramp angles on a flat vs a roller. If you are sold on a hyd flat you do have the option of increasing the lifter diameter, but it's hard to justify the expense, or you can have a flat custom ground to your combination.
Bob
08-31-2004, 08:20 AM
#3
Charter Member #655
Charter MemberThread Starter
Re: cam choice?
sounds like I'm going to need to switch to a roller....is it worth the cost?How much more hp can you make with a 741????
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If your boat has a sail do you ride a horse to the ramp?
If your boat has a sail do you ride a horse to the ramp?
08-31-2004, 08:43 AM
#4
Guest
Posts: n/a
Re: cam choice?
Dyno,
A rule of thumb is a [email protected]" roller is equal to a [email protected]" flat. Roller should be worth around 7 to 10% increase in power. Cam's don't make power, cams allow power to be made. They are the brain of the engine. The key is that the brain must let the right amount of air and fuel in at the right time to make max power under the curve.
Chris
A rule of thumb is a [email protected]" roller is equal to a [email protected]" flat. Roller should be worth around 7 to 10% increase in power. Cam's don't make power, cams allow power to be made. They are the brain of the engine. The key is that the brain must let the right amount of air and fuel in at the right time to make max power under the curve.
Chris
08-31-2004, 08:51 AM
#5
Charter Member #655
Charter MemberThread Starter
Re: cam choice?
Thanks Chris! I'm leaning twards building some stroker 454's this winter and wondering if the upgrade to a roller cam was worth the cost? Power is the third goal...reliability is everything! cost is second the best power is third....
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If your boat has a sail do you ride a horse to the ramp?
If your boat has a sail do you ride a horse to the ramp?
08-31-2004, 09:06 AM
#6
MarineKinetics
Platinum Member
Re: cam choice?
Dyno,
If reliability and performance is your focus, roller lifters are the clear choice and well worth the cost.. There are some new lifters available(are they ready yet?) that Chris has done some R&D on that have passed and exceed some stringent durability testing. They are very nice pieces. They aren't cheap, but they are cheaper than buying them twice.
Bob
If reliability and performance is your focus, roller lifters are the clear choice and well worth the cost.. There are some new lifters available(are they ready yet?) that Chris has done some R&D on that have passed and exceed some stringent durability testing. They are very nice pieces. They aren't cheap, but they are cheaper than buying them twice.
Bob
08-31-2004, 08:45 PM
#7
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Re: cam choice?
Originally Posted by rmbuilder
Dyno,
If reliability and performance is your focus, roller lifters are the clear choice and well worth the cost.. There are some new lifters available(are they ready yet?) that Chris has done some R&D on that have passed and exceed some stringent durability testing. They are very nice pieces. They aren't cheap, but they are cheaper than buying them twice.
Bob
If reliability and performance is your focus, roller lifters are the clear choice and well worth the cost.. There are some new lifters available(are they ready yet?) that Chris has done some R&D on that have passed and exceed some stringent durability testing. They are very nice pieces. They aren't cheap, but they are cheaper than buying them twice.
Bob
09-01-2004, 06:58 AM
#8
Charter Member #655
Charter MemberThread Starter
Re: cam choice?
Mine are gen 5 but have been told that the lifter bores can be a problem....
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If your boat has a sail do you ride a horse to the ramp?
If your boat has a sail do you ride a horse to the ramp?
09-01-2004, 08:26 AM
#9
Guest
Posts: n/a
Re: cam choice?
Bob,
Lifters have been shipping. . .new LS1 stuff has really taken off. The lifter will fit Gen 4, 5, and 6 without machine work.
Truing lifter bores is a good deal for a competition racer. Is it worth power. . .yes. BBC are notorious for lifter bores being out a few degrees. This throws of cam timing and can lead to lifter failure in flat tappet applications. Is it a good idea for a boater. . .if you can justify the $500 to $600 to have it done for a gain of around 20 to 30HP then yes do it, but for a pleasure boat I would not.
Dyno, what heads do you have?
Chris
Lifters have been shipping. . .new LS1 stuff has really taken off. The lifter will fit Gen 4, 5, and 6 without machine work.
Truing lifter bores is a good deal for a competition racer. Is it worth power. . .yes. BBC are notorious for lifter bores being out a few degrees. This throws of cam timing and can lead to lifter failure in flat tappet applications. Is it a good idea for a boater. . .if you can justify the $500 to $600 to have it done for a gain of around 20 to 30HP then yes do it, but for a pleasure boat I would not.
Dyno, what heads do you have?
Chris
