For anyone wanting to know what the cross section of the ports looks like, here is a silicone casting of the ports and combustion chamber
731 head left 885 head right
Measurements taken of the stock combustion chamber to give you an idea about what kind of engineering/drugs was involved in creating such a high-spec single cam engine from the 80's
Flow bench testing with putty added to the floor of the port for experimentation
The results that come from knowing what you are doing with cylinder head porting:
350rwhp on an NA M20
I wish I had all the time and knowledge to build a proper cylinder head but unfortunately I do not.
DrLeadFoot mentioned doing some porting on his old M20 and getting good results. Has anyone messed around with portwork?
I mostly plan on polishing the combustion chambers, mirror finish exhaust ports, port matching the intake and exhaust, then adding a dowel to the intake manifold/head for it to locate consistently after it is matched. Nothing too exotic. I would hate to do anything on the intake side to kill the performance.
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This thread here seems to hold some solid research and information concerning M20 cylinder head design/modification.
http://speedtalk.com/forum/viewtopic.php?f=1&t=31132
For anyone wanting to know what the cross section of the ports looks like, here is a silicone casting of the ports and combustion chamber
731 head left 885 head right
Measurements taken of the stock combustion chamber to give you an idea about what kind of engineering/drugs was involved in creating such a high-spec single cam engine from the 80's
Flow bench testing with putty added to the floor of the port for experimentation
The results that come from knowing what you are doing with cylinder head porting:
350rwhp on an NA M20
I wish I had all the time and knowledge to build a proper cylinder head but unfortunately I do not.
DrLeadFoot mentioned doing some porting on his old M20 and getting good results. Has anyone messed around with portwork?
I mostly plan on polishing the combustion chambers, mirror finish exhaust ports, port matching the intake and exhaust, then adding a dowel to the intake manifold/head for it to locate consistently after it is matched. Nothing too exotic. I would hate to do anything on the intake side to kill the performance.
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