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Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,076
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Harley EVO Porting Tricks
Anyone want to share what they have done to improve ?
I believe i have successfully ported / polished one shovel , One Porsche 911 , And now going to try the evo. The latter all had great dyno numbers.! But B4 I reinvent the wheel I thought i would just ask. Here are the specs This is stock stroke, with 85 inch Axtell drop in with 10. 5 CR D.M. 530 cam and some tulip valves. Dual plug single fire. Terry craved the heads so the little offset dome would not hit heads too hard ( LOL) Your thoughts?
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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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06-17-2014, 01:56 AM
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Registered
Join Date: Feb 2003
Location: Kailua, Bend, & Tamarack
Posts: 1,618
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My friend Jon Karcey worked on the Alan Johnson design years ago. You could probably Facebook him ..
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06-17-2014, 08:05 AM
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Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,076
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I do not F.B.
but thanx anyway
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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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06-17-2014, 08:16 AM
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Registered
Join Date: Feb 2003
Location: Kailua, Bend, & Tamarack
Posts: 1,618
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Neither do I, so I'll PM you ..
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06-17-2014, 08:33 AM
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Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,076
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Thanx
as far as F.B. - i had a acct. at one time....but once i found out ALL the information on there is "public" for a price i cancelled !
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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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06-17-2014, 08:36 AM
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Registered
Join Date: Mar 2004
Location: Higgs Field
Posts: 22,599
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Ever consider having a pro do them? I just had Baisely do the heads on my old Ironhead Sportster; I could not be happier. They did their "Superstock" job, with the addition of their roller tipped rockers. Not cheap, but with the addition of 10:1 Wiseco pistons and Andrews R5 cams, it sure made for a noticeable bump in power. They work on all Harleys and, apparently soon, 911's.
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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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06-17-2014, 02:36 PM
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Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,076
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Jeff
i always respect what you have to say So, Nah, I like to learn. I like to do it myself. I payed Branch to do a set in the late 70s. I think 300 bucks then. A friend of mine could out run me no problem. stock bike. lesson Learned the hard way. lots of HYPE What I am doing - Smoothing valve seats to head both sides. All ruff edges gone in combustion chamber Back side of vales pplished Tops of pistons polished The normal air transfer in front of guides (upside dwn boat) think i will call it about good there , see how it goes.
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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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06-17-2014, 03:36 PM
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Registered
Join Date: Mar 2004
Location: Higgs Field
Posts: 22,599
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I'm certainly no expert on head porting, but from what little I've managed to learn over the years, it sounds like you are on the right track. Most references I've read and folks who claim to know the voodoo magic of this pretty much agree with what you are doing - just clean them up, really, eliminating the sharp edges, casting imperfections, and that kind of thing. From what I understand that, and some attention in the valve guide area (your "upside down boat") makes for some real gains without risking ruining the heads. "Size matters" - don't make them bigger, just make them smoother. When I looked at what Baisely did on my Sportster heads, and what Mark Sutton did on my Ducati heads, that's all they really did. Have fun - let us know how it goes.
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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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06-17-2014, 06:09 PM
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