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Author Topic: pulled the heads.  (Read 2331 times)

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hdbrad03

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Re: pulled the heads.
« Reply #15 on: February 08, 2009, 01:00:20 AM »
Can you explain % throat on the intake valve so we can understand the benefits?

 :bananarock: :bananarock:
     Brad
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HD Street Performance

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Re: pulled the heads.
« Reply #16 on: February 08, 2009, 10:42:38 AM »
The throat is the choke point at or under the seat. The value is the diameter of the throat VS the valve diameter. With 93% using conventional seat angles the 45° angle is about your last as there is no material left for any lower angles. Theory of porting angles and sizes is a topic that will get hundreds of opinions but IME less than or equal to 90% is better for these motors. Flow bench agrees with this too.
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