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Matthew Samba Member
Joined: January 29, 2004 Posts: 1760 Location: Eastern Tennessee
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Posted: Wed Jul 31, 2013 12:21 pm Post subject: |
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What's the valve job like? A three angle would help flow. _________________ 1965 Beetle sedan
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JRKman Samba Member
Joined: June 21, 2011 Posts: 291 Location: Portland, OR
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Posted: Wed Jul 31, 2013 3:38 pm Post subject: |
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3 angle _________________ 1969 Type I
House paint red
1835cc single port:
Scat C25, ICT's, SVDA |
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Matthew Samba Member
Joined: January 29, 2004 Posts: 1760 Location: Eastern Tennessee
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Posted: Wed Jul 31, 2013 5:10 pm Post subject: |
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It's gonna be sweet. I don't care what any of the Single Port haters say. _________________ 1965 Beetle sedan
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Quokka42 Samba Member
Joined: December 02, 2010 Posts: 3117 Location: Melbourne, Australia
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Posted: Wed Jul 31, 2013 5:26 pm Post subject: |
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Haters gonna hate. _________________ There has only ever been one man who was perfect, and they nailed Him to a cross. |
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JRKman Samba Member
Joined: June 21, 2011 Posts: 291 Location: Portland, OR
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Posted: Wed Jul 31, 2013 8:58 pm Post subject: |
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I'm pretty stoked.
So it's looking like its cheaper for me to just buy a set of 8 1.25 rocker arms. What's the benefit of only running them on the intakes? If I have 8 shouldn't I just run them all?
-Josh _________________ 1969 Type I
House paint red
1835cc single port:
Scat C25, ICT's, SVDA |
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modok Samba Member
Joined: October 30, 2009 Posts: 26741 Location: Colorado Springs
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Posted: Wed Jul 31, 2013 9:20 pm Post subject: |
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I don't recall how much lift a c-25 has anyhow, but if it is less than .450 with the 1.25 then shoot, run em all. |
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JRKman Samba Member
Joined: June 21, 2011 Posts: 291 Location: Portland, OR
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Posted: Wed Jul 31, 2013 9:40 pm Post subject: |
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.365" with 1.1:1 and .415" with 1.25:1
What is the purpose of running them on intakes only anyways?
-Josh _________________ 1969 Type I
House paint red
1835cc single port:
Scat C25, ICT's, SVDA |
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modok Samba Member
Joined: October 30, 2009 Posts: 26741 Location: Colorado Springs
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Posted: Wed Jul 31, 2013 9:49 pm Post subject: |
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Well, you can have different reasons... but, usually in most engines, the intake valve is bigger so it has more lift.
Specific to the VWs, some heads have too much exhaust flow in comparison to intake, so you can dial it back a little with the rockers. And while running extra lift won't usually hurt power much, more lift wears out the guides faster, and you know the exhausts usually wear twice as fast as the intakes.......so there is that too. |
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JRKman Samba Member
Joined: June 21, 2011 Posts: 291 Location: Portland, OR
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Posted: Wed Jul 31, 2013 10:43 pm Post subject: |
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Alrighty so you'd just run 1.25's all around with .415" of lift? _________________ 1969 Type I
House paint red
1835cc single port:
Scat C25, ICT's, SVDA |
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ralf Samba Member
Joined: July 08, 2008 Posts: 1215 Location: r4
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Posted: Wed Jul 31, 2013 11:34 pm Post subject: |
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engle w100 lift @ valve is 0.420" (most of the time 0.418")
engle w110 lift @ valve is 0.430" (most of the time 0.424")
and thats been run/used on alot of stock sized valve heads
from small 1776cc to slightly big 1900-2000cc range bus motors
generally working well, the valvejob and portwork would dictate that
so, with your cam
and SP , seeing you have a decent 3 angle valve job etc
0.415" would prolly be something your heads can take advantage of
the cam is smaller in duration vs the 2 mention cams above
prolly helps in giving you a smooth idle
+ you compensate on more lift, with the lesser duration (valve curtain area)
so as modok says, i think running both would be ok.. if not great! _________________ Flow Through a Curved Conduit
porting my SP head for my brother's project
https://youtu.be/OS_mVjQuqgk |
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Quokka42 Samba Member
Joined: December 02, 2010 Posts: 3117 Location: Melbourne, Australia
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Posted: Wed Jul 31, 2013 11:42 pm Post subject: |
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Yeah, the exhaust valve is lighter and stainless valves don't lose their heads as easily as the stock ones any way. The different rocker idea comes from Harleys, where the valves are canted toward each other so you have to avoid them hitting. _________________ There has only ever been one man who was perfect, and they nailed Him to a cross. |
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JRKman Samba Member
Joined: June 21, 2011 Posts: 291 Location: Portland, OR
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Posted: Thu Aug 01, 2013 12:19 pm Post subject: |
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Awesome sounds like il be running 1.25's all around then. _________________ 1969 Type I
House paint red
1835cc single port:
Scat C25, ICT's, SVDA |
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catbox Samba Member
Joined: May 16, 2007 Posts: 859 Location: Portland, Oregon
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Posted: Thu Aug 01, 2013 1:09 pm Post subject: |
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JRKman wrote: |
Looks like I'm gonna have to wait a few weeks for my case to be ready. What can I do while I wait for the case. Can someone teach me how to use Emory cloth so I can polish the journals and assemble the rods to the crank?
-Josh |
If you used Steve's Machine Shop, I think he does the polishing while it is there. At least he did on mine.
I would call and check on it before doing anything to them.
_________________ "...these cars were preferred by the racers because the strut front suspension results in far superior handling than the regular torsion bar front end..." - Keith Seume. |
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JRKman Samba Member
Joined: June 21, 2011 Posts: 291 Location: Portland, OR
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Posted: Thu Aug 01, 2013 1:54 pm Post subject: |
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Oh that'd be nice. I pick everything up on Monday so we'll see if its done already.
-Josh _________________ 1969 Type I
House paint red
1835cc single port:
Scat C25, ICT's, SVDA |
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JRKman Samba Member
Joined: June 21, 2011 Posts: 291 Location: Portland, OR
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Posted: Tue Aug 06, 2013 11:30 am Post subject: |
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Got my stuff from balancing today. I had a very good experience through mikes precision machine so if you need balancing I do recommend him. I asked about polishing the crank and he gave me a worn out belt to use for polishing which I thought was pretty cool. I also resurfaced the flywheel while I had it there. Total came out to be $157. _________________ 1969 Type I
House paint red
1835cc single port:
Scat C25, ICT's, SVDA |
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bvilletom Samba Member
Joined: January 22, 2006 Posts: 95 Location: cedar rapids iowa usa
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Posted: Tue Aug 06, 2013 4:54 pm Post subject: |
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I have been following this single port motor build for some time now. I have built several single port engines in the past 4 years, some for Bonneville racing & the rest for a VW baja Ariz desert exploring & prospecting car. For the desert car low end torque & smooth reliable operation are most important. The last desert motor was just a 1600 (69x85.5) with a real 8.5 compression ratio. And .040” deck stock cam with Hoover mods, with fully ported single port heads with no step, with a real Solex 30 PICT 1 blueprinted off road carb and EMPI exhaust. Also I used the heaviest 200mm flywheel I could find, it smoothes out the low rpm for rock crawling on tough trails.
I think the single port heads are greatly underrated for performance and can be made to perform very well. I have a Super Flow bench and have been modifying heads for many years. Most singleports can be made to flow equal to or better than stock dual ports, it’s about port shape, valve shape, and attention to detail. I will try to print out some result sheets with this post of last winter’s single port heads. More later on my current 1835 single port build.
Enclosed is a picture.
_________________ bvilletom
36hp Challenge record holder New Age 126.236mph
1970 Porsche 914/6 – 2 liter LSR record holder
1992 Metro Sedan – 1 liter LSR records
1987 Chevy Turbo Sprint – under construction |
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tobiism Samba Member
Joined: January 21, 2004 Posts: 502 Location: Chandler AZ
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Posted: Tue Aug 06, 2013 5:05 pm Post subject: |
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bvilletom wrote: |
I have been following this single port motor build for some time now. I have built several single port engines in the past 4 years, some for Bonneville racing & the rest for a VW baja Ariz desert exploring & prospecting car. For the desert car low end torque & smooth reliable operation are most important. The last desert motor was just a 1600 (69x85.5) with a real 8.5 compression ratio. And .040” deck stock cam with Hoover mods, with fully ported single port heads with no step, with a real Solex 30 PICT 1 blueprinted off road carb and EMPI exhaust. Also I used the heaviest 200mm flywheel I could find, it smoothes out the low rpm for rock crawling on tough trails.
I think the single port heads are greatly underrated for performance and can be made to perform very well. I have a Super Flow bench and have been modifying heads for many years. Most singleports can be made to flow equal to or better than stock dual ports, it’s about port shape, valve shape, and attention to detail. I will try to print out some result sheets with this post of last winter’s single port heads. More later on my current 1835 single port build.
Enclosed is a picture.
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Sounds really cool, I would love to see more! _________________ "There has never been a genius without a hint of madness."
-Albert Einstein |
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JRKman Samba Member
Joined: June 21, 2011 Posts: 291 Location: Portland, OR
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Posted: Wed Aug 21, 2013 4:52 pm Post subject: |
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So I feel like installing the rods to the crank while I wait for my case. Anyone care to give me a step by step on the connecting rod install? Is it as simple as putting the bearings in, lubing and installing on crank? What measurements should I be taking?
-Josh _________________ 1969 Type I
House paint red
1835cc single port:
Scat C25, ICT's, SVDA |
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Quokka42 Samba Member
Joined: December 02, 2010 Posts: 3117 Location: Melbourne, Australia
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Posted: Thu Aug 22, 2013 1:39 am Post subject: |
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Plastigauge the bearings. If it is a bit loose when torqued up, gently sand the mating edges of the bearing shells on a piece of sandpaper on a sheet of glass, clean well and try again until they are within spec. Then re-oil and assemble. _________________ There has only ever been one man who was perfect, and they nailed Him to a cross. |
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modok Samba Member
Joined: October 30, 2009 Posts: 26741 Location: Colorado Springs
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Posted: Thu Aug 22, 2013 5:42 pm Post subject: |
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Plastigauge and faith in the rods is about all you can do without a dial bore gauge. |
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