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Discussion Topic:
Flathead "Port and Relieved"
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Jim |
04-04-2018 @ 2:47 PM
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Member
Posts: 33
Joined: Oct 2009
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What does it mean when a flathead engine is 'ported' and 'relieved'? How is it done, and what does this accomplish? More power? Greater efficiency? Cooler running temp? I'm a novice and wondered what these terms meant. THANKS!
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shogun1940 |
04-04-2018 @ 4:35 PM
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Member
Posts: 464
Joined: Feb 2010
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Porting is blending all of the intake passageways for a smooth flow of the air and fuel to the cylinder. They try and keep all of the passageways the same size so the air does not slow down and speed up. Relieving is done to the block for easier flow from the valves to the cylinder . I would look around, motor city flathead and other sites and you can pictures of both processes .
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MG |
04-04-2018 @ 5:16 PM
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Senior
Posts: 1260
Joined: Nov 2009
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There is a reduction in compression when a block is relieved....
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Drbrown |
04-04-2018 @ 10:15 PM
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Senior
Posts: 570
Joined: Nov 2013
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General consensus among those that have experience building (and racing) flathead muscle engines is that the procedures do not improve performance of street engines. If interested, there are several flathead forums where you can "search" the subject. A book published by Ol' Ron over at the Ford Barn includes the subject.
This message was edited by Drbrown on 4-4-18 @ 10:23 PM
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GK1918 |
04-05-2018 @ 4:12 AM
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New Member
Posts: 128
Joined: Aug 2016
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Watch "fiat nutz's on Utube" a Calf. engine machine shop machining the reliefs on the Bridgeport. just search his playlist..
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