Subject	Re: Good info! This is what I love reading! Any before CFM #'s?
Posted by	S2z on April 01, 2011 at 1:08 PM
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In Reply To	Good info! This is what I love reading! Any before CFM #'s? (n/m) posted by Jc (Houston) on March 31, 2011 at 11:45 PM
Message	Yes, I do have the Baseline readings, the ports Maximum flow (prior to any mods) was between 218 and 221 cfm Max. Which, for a totally stock head is not bad. Also of note is that the intake ports created a very loud whistling / howl noise at about 3 mm openings, which indicates a flow separation, (super-sonic flow) which is BAD. Every single Intake port exhibited this behavior during the baseline testing, at the same valve settings. It also made no difference if I used smaller inches of wc (Slowed the flow) all the way down to 10". Modifications removed this condition, AND the flow numbers jumped, so I knew I was on the right path...
Follow Ups	VG30DETT Cylinder Head Porting Observations - S2z 23:40:22 03/31/11 Good info! This is what I love reading! Any before CFM #'s? (n/m) - Jc (Houston) 23:45:47 03/31/11 Re: Good info! This is what I love reading! Any before CFM #'s? - S2z 13:08:38 04/01/11 Good info - BlackholeZ 15:25:57 04/01/11 FWIW.. there are many Zers with de-shrouded bosses - KongZTT GT28RS MD 23:56:16 03/31/11 My guess is it becomes an issue when the load is constant. - Jc (Houston) 00:03:14 04/01/11 Re: FWIW.. there are many Zers with de-shrouded bosses - S2z 13:42:39 04/01/11 which engineer did you speak to at JWT? (n/m) - KongZTT GT28RS MD 19:11:06 04/01/11 it seems odd to me that he won't reveal his sources (n/m) - aliaZ 22:50:18 04/02/11 2nd... (n/m) - KongZTT GT28RS MD 11:28:05 04/03/11 I don't agree with your conclusion on the spark plug boss - aliaZ 03:51:17 04/01/11
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