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EarlyBay Forums
Traders - Services / Group Buys
Head jobs- Gauging interest....
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<blockquote data-quote="jonboylaw" data-source="post: 561589" data-attributes="member: 17621"><p>Update, we have been measuring an 043 head to get baseline numbers.</p><p></p><p>1) stock inlet</p><p>2) modified inlet valve</p><p>3) modified seat and valve</p><p></p><p>Results:</p><p></p><p><img src="http://images.tapatalk-cdn.com/16/01/18/6528684be3b3f26947430bce8865f195.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Here you can see that simply reshaping the valve can add over 10% to low lift flow. When combined with a modified seat will give as much as 22% flow gain without even having to touch the ports or re-size the valves. You can see in the plot above that the valve/seat starts to run out of flow gain at over 0.450 inches of lift. Which is due to valve area/port flow. Considering a stock cam on 1.1:1 only gives 0.334" lift this will not be seen in a stock application. I will be flowing the inlet port later to see if there is any gain at low lift for stock set-up and also seeing if 40mm inlet will flow better still.</p><p></p><p>For 1776 and bigger, it is likely that a higher lift cam would be used and this would benefit from port flowing and or bigger inlet valves so I will repeat for the 40mm inlet valves and see what we get.</p><p></p><p></p><p></p><p></p><p></p><p></p><p>Sent from my GX64 SatCom phone using Tapatalk</p></blockquote><p></p>
[QUOTE="jonboylaw, post: 561589, member: 17621"] Update, we have been measuring an 043 head to get baseline numbers. 1) stock inlet 2) modified inlet valve 3) modified seat and valve Results: [IMG]http://images.tapatalk-cdn.com/16/01/18/6528684be3b3f26947430bce8865f195.jpg[/IMG] Here you can see that simply reshaping the valve can add over 10% to low lift flow. When combined with a modified seat will give as much as 22% flow gain without even having to touch the ports or re-size the valves. You can see in the plot above that the valve/seat starts to run out of flow gain at over 0.450 inches of lift. Which is due to valve area/port flow. Considering a stock cam on 1.1:1 only gives 0.334" lift this will not be seen in a stock application. I will be flowing the inlet port later to see if there is any gain at low lift for stock set-up and also seeing if 40mm inlet will flow better still. For 1776 and bigger, it is likely that a higher lift cam would be used and this would benefit from port flowing and or bigger inlet valves so I will repeat for the 40mm inlet valves and see what we get. Sent from my GX64 SatCom phone using Tapatalk [/QUOTE]
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EarlyBay Forums
Traders - Services / Group Buys
Head jobs- Gauging interest....
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