The New SE MVA Heads
#1
07-22-2009 | 10:56 PM
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The New SE MVA Heads
Anyone using these heads on their scoot? I am just curious if anyone likes these...looks like Harley may have actually started listening to customers and tried to fix the weak spots in their older style head by designing these new MVA heads
Here is what Harley has to say about them.
AREA (MVA) CYLINDER HEADS – CNC PORTEDThe most advanced Twin Cam performance cylinder head
design available. Screamin’ Eagle® CNC Ported Maximum
Velocity Area (MVA) cylinder heads create power across
the entire RPM range by maximizing velocity through the
intake ports. Increased air speed velocity through the ports
is achieved by “right sizing” port volume at 98cc, lowering
the port roof, and by precision machining the shape
of the port to complement the giant 2.125" intake valves.
Velocity Area (MVA) cylinder heads create power across
the entire RPM range by maximizing velocity through the
intake ports. Increased air speed velocity through the ports
is achieved by “right sizing” port volume at 98cc, lowering
the port roof, and by precision machining the shape
of the port to complement the giant 2.125" intake valves.
Screamin’ Eagle CNC-Ported MVA Cylinder Heads conquer
a unique engineering challenge, and provide the highest
possible torque and acceleration at any RPM. MVA Heads
will boost the punch of a 103" engine. When paired with
high lift cams, MVA Heads can give a 110" or 113" motor
everything it needs to achieve new levels of performance.
Countless hours of dyno testing resulted in a 95cc combustion
chamber that performs in perfect balance with the port
size and shape, and reduced detonation.
a unique engineering challenge, and provide the highest
possible torque and acceleration at any RPM. MVA Heads
will boost the punch of a 103" engine. When paired with
high lift cams, MVA Heads can give a 110" or 113" motor
everything it needs to achieve new levels of performance.
Countless hours of dyno testing resulted in a 95cc combustion
chamber that performs in perfect balance with the port
size and shape, and reduced detonation.
MVA Heads feature
Screamin’ Eagle Race Springs that permit the use of high lift
cams (up to .650"), and are machined to accept automatic
compression releases (sold separately) for easier starting.
MVA heads are manufactured and assembled at Harley-
Davidson’s world class engine factory in Milwaukee, insuring
every set is made to exact tolerances.Screamin’ Eagle Race Springs that permit the use of high lift
cams (up to .650"), and are machined to accept automatic
compression releases (sold separately) for easier starting.
MVA heads are manufactured and assembled at Harley-
Davidson’s world class engine factory in Milwaukee, insuring
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Flashlite
#3
07-23-2009 | 07:49 AM
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Well thats good that at least one persone likes them. i was starting to wonder if they too were poorly designed like all the other SE heads
i am starting my 113 race engine build today. i decided to go with the MVA heads just becasue they are such an improvement over the 110+ and older the styles. I will have to see what dyno results i get with them.
I got about a week or so until the bike is finished and then the break in so hopefully by the end of august i can get it on the machine.
___________
Flashlite
i am starting my 113 race engine build today. i decided to go with the MVA heads just becasue they are such an improvement over the 110+ and older the styles. I will have to see what dyno results i get with them.
I got about a week or so until the bike is finished and then the break in so hopefully by the end of august i can get it on the machine.
___________
Flashlite
#5
07-23-2009 | 07:53 PM
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well okay well please feel free to go more into detail on the " right pistons"
what you wrote is like saying
'make sure you put air in your tire or it will be flat'
what choices are you recommending on the piston selection.The pistons that come with the 113 are the 10.5 CR fourged alum. from SE.
are these any good?
what you wrote is like saying
'make sure you put air in your tire or it will be flat'
what choices are you recommending on the piston selection.The pistons that come with the 113 are the 10.5 CR fourged alum. from SE.
are these any good?
#6
07-24-2009 | 04:59 PM
Road Warrior
Joined: Nov 2007
Posts: 1,984
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Those heads have a reccometed piston that is designed to go with those heads from SE.
The heads have 95 cc combustion chambers and sometime HD has some odd shapes there. So many times, or almost always, you have to pick the correct piston for the heads.
So just check all this out or you will maybe have to change pistons. If you used your stock pistons with this head CR would be in the neighbor of 9.0 CR. ( stock head has 84 cc, MVA has 95cc it seems)
SE forged Pistons are very good.
The heads have 95 cc combustion chambers and sometime HD has some odd shapes there. So many times, or almost always, you have to pick the correct piston for the heads.
So just check all this out or you will maybe have to change pistons. If you used your stock pistons with this head CR would be in the neighbor of 9.0 CR. ( stock head has 84 cc, MVA has 95cc it seems)
SE forged Pistons are very good.
Last edited by Old Gunny; 07-24-2009 at 05:02 PM.
#7
07-24-2009 | 10:40 PM
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#9
07-25-2009 | 12:19 PM
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#10
07-25-2009 | 05:08 PM
Road Warrior
Joined: Nov 2007
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When you get those heads measure the inlets because the next thing you will be checking out is a bigger intake.
There are lots to chouse from. Some are designed to match certain inlet sizes.
I have a SE 58mm intake system that fits my stock ported heads. Inlets were sized the same as SE heads. But that was two years ago. Lord knows what these new heads inlets are.
And some manufactues have a big choice of sizes. Some available head inlets are not even round.
There are lots to chouse from. Some are designed to match certain inlet sizes.
I have a SE 58mm intake system that fits my stock ported heads. Inlets were sized the same as SE heads. But that was two years ago. Lord knows what these new heads inlets are.
And some manufactues have a big choice of sizes. Some available head inlets are not even round.