piston dome volume cc
Thread Starter
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Road Master
Joined: Dec 2008
Posts: 872
Likes: 20
From: Niagara Falls Canada
piston dome volume cc
any one know the piston dome cc on a se 10.5-1 piston goes with the mva heads
If i am reading the catalog correctly the head has a volume of 95 CC BUT I DONT SEE ANYTHING ON HARLEY SIte for these pistons i would like to get my ccp pressure down and have a lower compresion with out going back to my flat tops and then payin a fortune to have my stock head redone since i already have these heads
I have 255 cams right now and ccp is 207 if i am using the big boyz calculator correctly
I would like to go with an andrews 54 but again if i am using the big boyz calculator correctly the piston dome volume needs to be 6.2 to hit 180 ccp with stock head gasket. 045 head cc 95 103 3,875x4.37 piston
Whenusing this calulator it says -1.5 for stock pistons dome volume it says use 11.5 forr the 10.5-1 pistons
Got 100 hp 107 torque a better tuner than one i used says until ccp is down about 180 its pointless to try and tune it at least he is honest and didnt rip me off like the first guy
I got all the parts i need stock heads mva heads 2 sets of cylinders 103 flat tops pistons and 103 10.5-1 domes ones that matchheads im wondering if i can have the domed pistons milled down to get the right cc value and keep my mvs heads with auto decompression releases tuner said the stock heads reworked have better flow than my mva ones with higher velocity, id bet flow is higher on mva one but speed of air flow is less velocity but what do i know
If i am reading the catalog correctly the head has a volume of 95 CC BUT I DONT SEE ANYTHING ON HARLEY SIte for these pistons i would like to get my ccp pressure down and have a lower compresion with out going back to my flat tops and then payin a fortune to have my stock head redone since i already have these heads
I have 255 cams right now and ccp is 207 if i am using the big boyz calculator correctly
I would like to go with an andrews 54 but again if i am using the big boyz calculator correctly the piston dome volume needs to be 6.2 to hit 180 ccp with stock head gasket. 045 head cc 95 103 3,875x4.37 piston
Whenusing this calulator it says -1.5 for stock pistons dome volume it says use 11.5 forr the 10.5-1 pistons
Got 100 hp 107 torque a better tuner than one i used says until ccp is down about 180 its pointless to try and tune it at least he is honest and didnt rip me off like the first guy
I got all the parts i need stock heads mva heads 2 sets of cylinders 103 flat tops pistons and 103 10.5-1 domes ones that matchheads im wondering if i can have the domed pistons milled down to get the right cc value and keep my mvs heads with auto decompression releases tuner said the stock heads reworked have better flow than my mva ones with higher velocity, id bet flow is higher on mva one but speed of air flow is less velocity but what do i know
Last edited by 2009blackpearle; Jul 28, 2012 at 04:25 PM.
Stellar HDF Member
Joined: Apr 2005
Posts: 3,108
Likes: 9
From: Lincolnton, NC
no rep[lies for 3 days cant be that much of a stumper question
https://www.hdforums.com/forum/engin...ke-exhaust-57/
I'm not exactly sure where you are with your modifications right now and what the problem is that you are trying to cure. If it is a stock 103 then you aren't in bad shape with 100hp/107tq. Are you getting detonation? Anyway, everyone I've ever talked to about it says the MVA heads don't work well on anything less than a 110ci and not that well on those. They do pretty well on 117ci I'm told. Have you actually done a CCP on your bike or are you just using the calculator? Also, any tuner worth the money should be able to tune your bike at more than 180 psi. So if you have a 103, stock heads, a .045 head gasket, -1.5 dome volume (usually flat tops with valve eyebrows), and SE255 I'm showing 199 psi. With the Andrews 54H I got 185 psi. CCP at sea level. Altitude also affects your CCP.
Thread Starter
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Road Master
Joined: Dec 2008
Posts: 872
Likes: 20
From: Niagara Falls Canada
thanks stone
i already had it dynoed by one guy but when i looked at the map it had absolutly no changes from a se map right from race tuner files , he tried a few maps and after 1.3 hours and 400 bucks later he says he was done. he forgot to turn on my acrs then when i get hold of him a few days later he say so what do u want me to do,, a hint fix your mistake. new got hook back up so i just took a newer version of the map from rac tuner files and turned acrs my self once i found out he didnt change a thing.
I didnt do any measuring of parts just used the calculator trying to figure out what i will do next winter.
the 255 cams develope way too much compression with the 10.5-1 pistons. I was going to keep my flat tops in the cylinder when i ordered the mva heads, but some one in here said my compression would be too low, this was before i found the big boyz calculator and didnt realize that these cams changes completely change the ccp with each change. from what ive been told the best ccp number to have is 180 . had i left the flat tops in the motor with the 255 cams i would have been at 178.5 and i dont think i would have gotten much more hp or torque , since the 255 isnt a high hp cam, but the motor as it is now is very poppy feel with the high compression and the 255 cams. I think i may be getting a bit of blow by the rings, switched to reg dino oil last oil change hoping the rings would seat better. i was getting more oil out the breather vents, but seems to have slowed down in the last week. the bike runs very good but im sure this extra high compression will cause problems further down the road.
the se pistons says forged in catalog . hoping to see a real good tuner next week who apparently has had hd land speed records at salt flats over the years.
I didnt do any measuring of parts just used the calculator trying to figure out what i will do next winter.
the 255 cams develope way too much compression with the 10.5-1 pistons. I was going to keep my flat tops in the cylinder when i ordered the mva heads, but some one in here said my compression would be too low, this was before i found the big boyz calculator and didnt realize that these cams changes completely change the ccp with each change. from what ive been told the best ccp number to have is 180 . had i left the flat tops in the motor with the 255 cams i would have been at 178.5 and i dont think i would have gotten much more hp or torque , since the 255 isnt a high hp cam, but the motor as it is now is very poppy feel with the high compression and the 255 cams. I think i may be getting a bit of blow by the rings, switched to reg dino oil last oil change hoping the rings would seat better. i was getting more oil out the breather vents, but seems to have slowed down in the last week. the bike runs very good but im sure this extra high compression will cause problems further down the road.
the se pistons says forged in catalog . hoping to see a real good tuner next week who apparently has had hd land speed records at salt flats over the years.
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If you look in the SE catalog there is a chart that tells the static compression with each of their head offerings. You could go backwards from that to figure the dome volume of your pistons. I think you would do better to have the stock heads reworked if you are at 103 ci. A good porter can set the head volume where it will benefit you best. You could also choose a cam that closes the intake later which will lower the effective compession. I don't know where you live, but a good builder/tuner can steer you in the right direction.
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Road Warrior
Joined: Jun 2009
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From: NYC
any one know the piston dome cc on a se 10.5-1 piston goes with the mva heads
If i am reading the catalog correctly the head has a volume of 95 CC BUT I DONT SEE ANYTHING ON HARLEY SIte for these pistons i would like to get my ccp pressure down and have a lower compresion with out going back to my flat tops and then payin a fortune to have my stock head redone since i already have these heads
I have 255 cams right now and ccp is 207 if i am using the big boyz calculator correctly
I would like to go with an andrews 54 but again if i am using the big boyz calculator correctly the piston dome volume needs to be 6.2 to hit 180 ccp with stock head gasket. 045 head cc 95 103 3,875x4.37 piston
Whenusing this calulator it says -1.5 for stock pistons dome volume it says use 11.5 forr the 10.5-1 pistons
Got 100 hp 107 torque a better tuner than one i used says until ccp is down about 180 its pointless to try and tune it at least he is honest and didnt rip me off like the first guy
I got all the parts i need stock heads mva heads 2 sets of cylinders 103 flat tops pistons and 103 10.5-1 domes ones that matchheads im wondering if i can have the domed pistons milled down to get the right cc value and keep my mvs heads with auto decompression releases tuner said the stock heads reworked have better flow than my mva ones with higher velocity, id bet flow is higher on mva one but speed of air flow is less velocity but what do i know
If i am reading the catalog correctly the head has a volume of 95 CC BUT I DONT SEE ANYTHING ON HARLEY SIte for these pistons i would like to get my ccp pressure down and have a lower compresion with out going back to my flat tops and then payin a fortune to have my stock head redone since i already have these heads
I have 255 cams right now and ccp is 207 if i am using the big boyz calculator correctly
I would like to go with an andrews 54 but again if i am using the big boyz calculator correctly the piston dome volume needs to be 6.2 to hit 180 ccp with stock head gasket. 045 head cc 95 103 3,875x4.37 piston
Whenusing this calulator it says -1.5 for stock pistons dome volume it says use 11.5 forr the 10.5-1 pistons
Got 100 hp 107 torque a better tuner than one i used says until ccp is down about 180 its pointless to try and tune it at least he is honest and didnt rip me off like the first guy
I got all the parts i need stock heads mva heads 2 sets of cylinders 103 flat tops pistons and 103 10.5-1 domes ones that matchheads im wondering if i can have the domed pistons milled down to get the right cc value and keep my mvs heads with auto decompression releases tuner said the stock heads reworked have better flow than my mva ones with higher velocity, id bet flow is higher on mva one but speed of air flow is less velocity but what do i know