Porting cylinder heads
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| − | == | + | ==Preamble== |
The purpose of this article is to acquaint engine builders on the tangible benefits of cylinder head porting and making more power through the porting process. Cylinder head porting or 'porting' as it is known in the hot rod circles, is classed by some as '''black magic''' in the engine building process. Proper porting procedures will result in getting the largest volume of air/fuel mix to the combustion chamber in the shortest amount of time. Porting works hand in hand with valve grinding and seat cutting. | The purpose of this article is to acquaint engine builders on the tangible benefits of cylinder head porting and making more power through the porting process. Cylinder head porting or 'porting' as it is known in the hot rod circles, is classed by some as '''black magic''' in the engine building process. Proper porting procedures will result in getting the largest volume of air/fuel mix to the combustion chamber in the shortest amount of time. Porting works hand in hand with valve grinding and seat cutting. | ||
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| − | == Porting | + | == Porting tools and materials == |
===Die Grinders=== | ===Die Grinders=== | ||
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===Layout dyes=== | ===Layout dyes=== | ||
| + | [[File:DYKUM BLUE TUBE 001.jpg|thumb|100px|Dykum blue layout dye]] | ||
| + | One common type of metal dye is machinist lay out paste, dykum blue, prussian blue, etc. Comes in a tube, is thick enough to be spread out with a piece of paper towel, etc. After it sets up for a few minutes, the scribing can be done. | ||
| + | Another type comes as a liquid in an alchol base that can be sprayed or wiped on. When the alcohol evaporates, the dye is left behind for scribing. | ||
== Porting methods == | == Porting methods == | ||
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===Hand porting and polishing=== | ===Hand porting and polishing=== | ||
| − | + | == Step by step porting methods == | |
| − | == Step by | + | |
Before you go out and grab your tools and start grinding on those $1000 Edelbrock heads you just bought, STOP. Porting requires practice, so do exactly that, practice on a set of old nondescript heads that you picked up at the local auto recycler. Try out your tools and see what they do. Remember to use the correct tool for cast and aluminum heads so you do not ruin the tool and hurt yourself. After you feel confident with working with your tools, we will go on to explaining what we want to accomplish in each segment. | Before you go out and grab your tools and start grinding on those $1000 Edelbrock heads you just bought, STOP. Porting requires practice, so do exactly that, practice on a set of old nondescript heads that you picked up at the local auto recycler. Try out your tools and see what they do. Remember to use the correct tool for cast and aluminum heads so you do not ruin the tool and hurt yourself. After you feel confident with working with your tools, we will go on to explaining what we want to accomplish in each segment. | ||
| − | + | ===Gasket matching=== | |
| − | ===Gasket | + | |
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This is a simple process whereby we will match thermostat housing to an intake manifold for better flow of coolant from the engine to the radiator. Begin by cleaning off the surface of both housing and intake mating surfaces. Remove all gasket material and glue with acetone and a gasket scraper. True the surface of slight imperfections by using a mill/bastard file place flat on the gasket surface working the file back and forth. The shiny sports are the highs and the dull ones are the lows, true these surfaces. When a flat surface is obtained,paint the surface with Dykem dye, lay a new gasket on the surface and insert the bolts in the holes of the intake to center the gasket over the openings. With a scribe, scratch along the gasket edge around the opening. When complete, remove bolts and gasket. This will reveal a scribed line in the purple dye that you will be enlarging up the opening to. | This is a simple process whereby we will match thermostat housing to an intake manifold for better flow of coolant from the engine to the radiator. Begin by cleaning off the surface of both housing and intake mating surfaces. Remove all gasket material and glue with acetone and a gasket scraper. True the surface of slight imperfections by using a mill/bastard file place flat on the gasket surface working the file back and forth. The shiny sports are the highs and the dull ones are the lows, true these surfaces. When a flat surface is obtained,paint the surface with Dykem dye, lay a new gasket on the surface and insert the bolts in the holes of the intake to center the gasket over the openings. With a scribe, scratch along the gasket edge around the opening. When complete, remove bolts and gasket. This will reveal a scribed line in the purple dye that you will be enlarging up the opening to. | ||
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*Apply this process to the other gaskets on your heads for optimum flow. | *Apply this process to the other gaskets on your heads for optimum flow. | ||
| + | ==Photos== | ||
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| + | |[[File:Comb_chambers.jpg|border|thumb|left|400px]] | ||
| + | |[[File:Short_side.jpg|thumb|left|400px]] | ||
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| − | + | {| | |
| + | |[[File:Intake.jpg|border|thumb|left|400px]] | ||
| + | |[[File:Intake_Edelbrock.jpg|thumb|left|400px]] | ||
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| − | + | ==References== | |
| + | *If you like the hands-on video approach, this is it: [http://www.youtube.com/watch?v=35O7mkLncHU CYLINDER HEAD REBUILD - VALVE JOB AND PORT & POLISH ON DVD] | ||
| − | A great article on valve shrouding: http://www.diyporting.com/Shrouding.html | + | ==Related links== |
| + | *Check out the videos of CNC porting here: [http://www.centroidcnc.com/cnc_porting_machine.html CNC Cylinder Head Porting and Engine Block Machines] | ||
| + | *Looking for tools and abrasives, try here: [http://www.ruffstuff.com/ CHA, or Cylinder Head Abrasives] | ||
| + | *A more technical approach: [http://hubpages.com/hub/Cylinder-Head-Porting-101 Cylinder Head Porting 101] | ||
| + | *A great article on valve shrouding: [http://www.diyporting.com/Shrouding.html Valve Shrouding] from diyPorting.com | ||
[[Category:Engine]] | [[Category:Engine]] | ||
| + | [[Category:Cylinder head]] | ||
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