Beheading the B-head
05-09-2011, 10:46 PM
#1
Beheading the B-head
I've begun piecing together my heads, cam, and intake swap. just got in my '01 Cobra intake manifold . . .
. . . and yeah I'm going to clean it.
Here's one quick question (I'm sure there'll be more)
When swapping out the B-heads to later DOHC heads, like the '04 Aviator's I'm planning on using, is there any change in compression ratio?
I only ask because I know in certain situations it changes e.g.(NPI to PI swap) even without extra shaving on the head deck. Just differences of combustion chamber etc.
. . . and yeah I'm going to clean it.
Here's one quick question (I'm sure there'll be more)
When swapping out the B-heads to later DOHC heads, like the '04 Aviator's I'm planning on using, is there any change in compression ratio?
I only ask because I know in certain situations it changes e.g.(NPI to PI swap) even without extra shaving on the head deck. Just differences of combustion chamber etc.
05-19-2011, 09:53 AM
#5
4th Gear Member
Join Date: Apr 2009
Location: sttesuhcaxaT (The State you love to hate)
Posts: 1,360
05-19-2011, 04:37 PM
#6
I'm hoping na svt over on SVTP will get a B lid to C lower adapter eventually. If not I may have my fiance's father, he's a metal fabricator, try to make me one.
05-19-2011, 09:10 PM
#7
4th Gear Member
Join Date: Feb 2008
Location: Long Island, New York
Posts: 1,858
05-21-2011, 04:46 PM
#9
5th Gear Member
Join Date: Nov 2007
Location: Maryland
Posts: 4,955
The B heads don't "Flow" better, the difference is in velocity....
-------intake-----exhaust
.050---39---------34
.100---79---------71
.150---114---------97
.200---144---------119
.250---172---------132
.300---194---------138
.350---207---------141
.400---217---------144
.450---225---------145
.500---231---------146
c heads
-------intake-----exhaust
.050---40---------34
.100---88---------74
.150---118---------102
.200---151---------123
.250---178---------133
.300---201---------138
.350---211---------140
.400---221---------143
.450---229---------145
.500---233---------145
-------intake-----exhaust
.050---39---------34
.100---79---------71
.150---114---------97
.200---144---------119
.250---172---------132
.300---194---------138
.350---207---------141
.400---217---------144
.450---225---------145
.500---231---------146
c heads
-------intake-----exhaust
.050---40---------34
.100---88---------74
.150---118---------102
.200---151---------123
.250---178---------133
.300---201---------138
.350---211---------140
.400---221---------143
.450---229---------145
.500---233---------145
Last edited by SVTeeshirt; 05-21-2011 at 04:57 PM.
05-22-2011, 09:55 PM
#10
4th Gear Member
Join Date: Apr 2009
Location: sttesuhcaxaT (The State you love to hate)
Posts: 1,360
The B heads don't "Flow" better, the difference is in velocity....
-------intake-----exhaust
.050---39---------34
.100---79---------71
.150---114---------97
.200---144---------119
.250---172---------132
.300---194---------138
.350---207---------141
.400---217---------144
.450---225---------145
.500---231---------146
c heads
-------intake-----exhaust
.050---40---------34
.100---88---------74
.150---118---------102
.200---151---------123
.250---178---------133
.300---201---------138
.350---211---------140
.400---221---------143
.450---229---------145
.500---233---------145
-------intake-----exhaust
.050---39---------34
.100---79---------71
.150---114---------97
.200---144---------119
.250---172---------132
.300---194---------138
.350---207---------141
.400---217---------144
.450---225---------145
.500---231---------146
c heads
-------intake-----exhaust
.050---40---------34
.100---88---------74
.150---118---------102
.200---151---------123
.250---178---------133
.300---201---------138
.350---211---------140
.400---221---------143
.450---229---------145
.500---233---------145
Make sense
