What's wrong with AFR's exhaust port?
03-02-2015 | 07:11 PM
#101
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From: taxachusetts
What did Darrin Morgan charge for something like that, Bill? I am wondering how many CFM numbers it takes to gain or make 1-hp??? Does anyone know?
Like I have said previously, if it is for a car race application where saving a pound of weight here and there as well as low as 1-hp, then maybe I can understand these small increases for the time and expense involve for a drag car clocking time in the 1/4 mile....or a circle track car, but I think a boat is a whole different animal and these CNC ports have already filled the gap considerably.
I will admit that I like the ports to be as efficient as possible, and I am sure every little bit helps, and I suppose it depends on how much $$$ a person wants to spend, but where do I draw the line for a pair of hi-zoot offshore engines with supercharging that are already equipped with CNC ported heads that are going in a pleasure boat? Are we splitting hairs here?
Like I have said previously, if it is for a car race application where saving a pound of weight here and there as well as low as 1-hp, then maybe I can understand these small increases for the time and expense involve for a drag car clocking time in the 1/4 mile....or a circle track car, but I think a boat is a whole different animal and these CNC ports have already filled the gap considerably.
I will admit that I like the ports to be as efficient as possible, and I am sure every little bit helps, and I suppose it depends on how much $$$ a person wants to spend, but where do I draw the line for a pair of hi-zoot offshore engines with supercharging that are already equipped with CNC ported heads that are going in a pleasure boat? Are we splitting hairs here?
03-02-2015 | 07:21 PM
#102
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From: bel air, md
Years ago yes they were "splashed". Today it's a different story. When getting into a more custom CNC'd head they use computational fluid dynamics to design the port. The port is designed to meat the engines air requirements based on cubic inch and rpm. Based off of the port model they program the CNC to produce the port.
03-02-2015 | 07:48 PM
#103
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From: rock Island wa
While no engine builder, l have to believe every combo possible under the sun is going to have a sweet spot, and the heads are cast and ground somewhere in the middle, and if you have the funds and need for the last hp on the table, its there for the taking. Afr or any other after market supplier has no idea what a particular piece will be used on, so it's somewhat generic off the shelf, although far beyond stock.
03-02-2015 | 08:44 PM
#104
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From: Raystown Lake , Pa.
Last edited by the deep; 03-02-2015 at 08:53 PM.
03-02-2015 | 10:18 PM
#105
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From: yorkville,il
While no engine builder, l have to believe every combo possible under the sun is going to have a sweet spot, and the heads are cast and ground somewhere in the middle, and if you have the funds and need for the last hp on the table, its there for the taking. Afr or any other after market supplier has no idea what a particular piece will be used on, so it's somewhat generic off the shelf, although far beyond stock.
Last edited by mike tkach; 03-02-2015 at 10:21 PM.
03-03-2015 | 06:17 AM
#107
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From: OK CIty, OK
This whole topic of head porting conversation has revolved around subtractive machining, traditional cutting. I can't wait to see a head designed and executed from a blank sheet with an additive manufacturing approach, 3D printing.
03-03-2015 | 06:50 AM
#108
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From: bel air, md
Absolutely. The only difference between the N/A and Blown motor is one has compressed air flowing into the cylinder one has atmospheric air. In essence with a blower you are creating a different atmosphere.
03-03-2015 | 06:54 AM
#109
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From: bel air, md
The programmer is the next generation.
This whole topic of head porting conversation has revolved around subtractive machining, traditional cutting. I can't wait to see a head designed and executed from a blank sheet with an additive manufacturing approach, 3D printing.
This whole topic of head porting conversation has revolved around subtractive machining, traditional cutting. I can't wait to see a head designed and executed from a blank sheet with an additive manufacturing approach, 3D printing.
Could you elaborate on your idea a little?
