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Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,072
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Never mind.
The tangent of the angle has been solved
Last edited by afterburn 549; 02-17-2018 at 10:07 PM.. |
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12-18-2017, 08:32 AM
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Banned
Join Date: Aug 2017
Posts: 928
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12-18-2017, 12:14 PM
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Banned
Join Date: Aug 2017
Posts: 928
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ETA: Jerry Branch did my last set of custom heads but they were for a shovel chop. Ported, cc'ed, polished, double-plugged, 5-angle valve job etc. He can be found at Branch-O'Keefe.
These days I just run factory CNC ported heads on a 120R twin-cam street engine. Roller rockers, offset rocker plate, compression release, .658" lift etc. Last edited by Borders Reivers; 12-18-2017 at 12:39 PM.. |
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12-18-2017, 12:34 PM
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Registered
Join Date: Jan 2007
Posts: 11,758
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I was always taught that it was the width of the contact and the duration of contact that kept the valves from getting too hot. 1 MM of contact is not enough, it always seems like around 2 MM is the sweet spot. If you have that and a solid edge that is not ground to a V, than back cutting of the valve itself seems like a reasonable thing to do. Never really heard of the 50 deg angle.
I will be interested in seeing what comes up in this thread. |
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12-19-2017, 02:10 AM
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Registered
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Posts: 11,758
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12-19-2017, 02:13 AM
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Still Doin Time
Join Date: Nov 2004
Location: Nokesville, Va.
Posts: 8,225
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Also consult with Zippers Performance / Elkridge Md. I'd have to do some research as to what is optimal in HD. But know they take quite the beating being aircooled, lots of valvetrain mass, lots of spring pressure if you are running any kind of modern profile cam. It's all about flow + longevity in a street engine.
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'15 Dodge - 'Dango R/T Hauls groceries and Kinda Hauls *ss '07 Jeep SRT-8 - Hauls groceries and Hauls *ss Sold '85 Guards Red Targa - Almost finished after 17 years '95 Road King w/117ci - No time to ride, see above '77 Sportster Pro-Street Drag Bike w/93ci - Sold |
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12-19-2017, 08:55 AM
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Registered
Join Date: Mar 2004
Location: Higgs Field
Posts: 22,582
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As long as we are talking Jerry Branch and Zippers - two of the biggest, most respected names in the business, I thought I would throw out our Northwest locals for consideration as well. I've had great luck with the Baisleys in Portland, Oregon. Old man Wes, his son Dan, and now the grandkids do fantastic work. I'm running a set of their reworked heads on my '76 Sportster right now. Couldn't be happier.
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Jeff '72 911T 3.0 MFI '93 Ducati 900 Super Sport "God invented whiskey so the Irish wouldn't rule the world" |
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12-19-2017, 10:57 AM
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Still Doin Time
Join Date: Nov 2004
Location: Nokesville, Va.
Posts: 8,225
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You go son! Good info
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'15 Dodge - 'Dango R/T Hauls groceries and Kinda Hauls *ss '07 Jeep SRT-8 - Hauls groceries and Hauls *ss Sold '85 Guards Red Targa - Almost finished after 17 years '95 Road King w/117ci - No time to ride, see above '77 Sportster Pro-Street Drag Bike w/93ci - Sold |
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12-19-2017, 03:43 PM
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Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,072
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No dyno test yet- but with the intake ports raised 1/2 inch up and 50 deg seats, the static CR has gone up a bunch.
It truly has affected the larger dynamics. So much so I either have to retard the 530 cam, or install a larger LSA cam , which is what I will probably do. (like the 595 lift version) I promise a dyno report by Spring. It will be interesting to see how this has worked out. Even I am interested in the devils in the details.
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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12-16-2019, 12:18 AM
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