What HEADS would you select? On a 2K budget.
#11
Registered
Re: What HEADS would you select? On a 2K budget.
How many rpms are you turning and what speed. Your engine looks like a torque monster on paper. Maybe you should try going up in pitch on the prop. It might be making more power but at a lower or the same rpms.
#12
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Thread Starter
Re: What HEADS would you select? On a 2K budget.
Its turning a 24 labbed prop at 4,900. Around 68 GPS
in a Pachanga-22.
in a Pachanga-22.
#13
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Re: What HEADS would you select? On a 2K budget.
Originally Posted by 1BIGJIM
The cam is a COMP 270 Extreme Marine
hyd.flat tappet
544 547 Gross Lift
112 center line
Adv Max RPM 5,800
hyd.flat tappet
544 547 Gross Lift
112 center line
Adv Max RPM 5,800
With a good set of heads and an intake to match your engine will make a lot more power. Those heads need lots of work and bigger valves to flow.
Is the engine sit in the boat?
Swapping heads and an intake is doable in the boat, a cam change would be a PIA...
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Patrick
Patrick
Last edited by Pat McPherson; 03-08-2006 at 07:07 AM.
#15
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Re: What HEADS would you select? On a 2K budget.
Originally Posted by PatriYacht
How many rpms are you turning and what speed. Your engine looks like a torque monster on paper. Maybe you should try going up in pitch on the prop. It might be making more power but at a lower or the same rpms.
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Patrick
Patrick
#16
Charter Member #927
Charter Member
Re: What HEADS would you select? On a 2K budget.
Originally Posted by Pat McPherson
Personally I think you have selected cam that should make real good power to 5000rpm in your 496 with better flowing heads. The tighter 112° LSA will extend the rpm range vs. the 114° of the 420cam.
With a good set of heads and an intake to match your engine will make a lot more power. Those peanut port heads need lots of work to flow.
Is the engine sit in the boat?
Swapping heads and an intake is doable in the boat, a cam change would be a PIA...
With a good set of heads and an intake to match your engine will make a lot more power. Those peanut port heads need lots of work to flow.
Is the engine sit in the boat?
Swapping heads and an intake is doable in the boat, a cam change would be a PIA...
http://www.cranecams.com/?show=brows...61&lvl=2&prt=5
#17
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Re: What HEADS would you select? On a 2K budget.
Originally Posted by Payton
Lift: Opens Closes Max Lift Duration
Intake 5 BTDC 43 ABDC 109 228 °
Exhaust 57 BBDC (1) BTDC 119 236 °
Maybe I'm not doing the math right, but I believe 114°LSA
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Patrick
Patrick
#18
MarineKinetics
Platinum Member
Re: What HEADS would you select? On a 2K budget.
Originally Posted by Pat McPherson
Cam Timing: TAPPET @.050
Lift: Opens Closes Max Lift Duration
Intake 5 BTDC 43 ABDC 109 228 °
Exhaust 57 BBDC (1) BTDC 119 236 °
Maybe I'm not doing the math right, but I believe 114°LSA
Lift: Opens Closes Max Lift Duration
Intake 5 BTDC 43 ABDC 109 228 °
Exhaust 57 BBDC (1) BTDC 119 236 °
Maybe I'm not doing the math right, but I believe 114°LSA
You are correct.
109º ICL
119º ECL
114º LSA
Bob
#19
Registered
Thread Starter
Re: What HEADS would you select? On a 2K budget.
With out going to a roller cam
and
my current cam will work,,
Getting back to my original question
What heads would you select?
The engine is in its winter home ENGINE STAND
and
my current cam will work,,
Getting back to my original question
What heads would you select?
The engine is in its winter home ENGINE STAND
#20
Re: What HEADS would you select? On a 2K budget.
Personally, I like the Brodix 3x CNC. They have made great power for me and have been recommended by many engine builders.
You might also look at the PRO 1's from Keith Eikert. They are advertised in the classified's for 2k a set complete, I think.
You might also look at the PRO 1's from Keith Eikert. They are advertised in the classified's for 2k a set complete, I think.