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Hophead Samba Member
Joined: January 03, 2005 Posts: 940 Location: Chico,Ca
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Posted: Thu Oct 20, 2011 6:25 pm Post subject: Cutting dual taper pushrods |
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I have some Manton dual taper pushrods that I need to shorten 1.5 CM. In a perfect world you cut an equal amount off of both ends. Is it really a big deal if I lopp it all off of one end. I am looking at 8 cuts instead of 16.
I am using Jaycee pushrod tubes with 1.4 rockers. If i did just one end would there be any rubbing? _________________ 70' Beetle Pan off Resto
2110cc
82 X 90.5
P&P 043 40x35.5
9.6-1 comp
FK-8
48 IDA |
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slalombuggy Samba Member
Joined: July 17, 2010 Posts: 9131 Location: Canada
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Posted: Thu Oct 20, 2011 6:32 pm Post subject: |
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To me, it isn't worth buying a part like that if you aren't going to do it right. This ain't the time to get lazy, I used a small tubing cutter and did all 8 of mine in pretty quick time. Take the time, do it right, you did spend good money to buy good parts.
brad |
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baked beetle Samba Member
Joined: September 23, 2006 Posts: 1162 Location: Alberta, Canada
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Posted: Thu Oct 20, 2011 6:37 pm Post subject: |
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no I wouldn't waste my time for 1.5 cm but that may be just me...........is one end assembled already? if so I would cut the unassembled end and use that end in the lifter, that would move the taper down and possibly giving more clearance an the PR tube lip. _________________ These days people like me are hard to find- we don't give a damn what you think, about what we think. - JR
____________________
66' His
57' Theirs
63' Hers
62' Drag Bug - Theirs 13.1 @ 101 mph (GONE) |
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Hophead Samba Member
Joined: January 03, 2005 Posts: 940 Location: Chico,Ca
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Posted: Thu Oct 20, 2011 6:50 pm Post subject: |
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I have not cut anything yet... was going to use a chop saw. I was afraid a pipe cutter would wander down the taper.
Even if I cut the full amount off of one end there is still some taper left. It is not that I am lazy or in a hurry. It is just setting up the saw for one cut would reduce the chance of introducing error accross the set of eight.
Where is the taper of benefit anyways? Out at the head?
Also, How do you ensure equal length with a tubing cutter? With a chop saw i was going to set up a flip stop. _________________ 70' Beetle Pan off Resto
2110cc
82 X 90.5
P&P 043 40x35.5
9.6-1 comp
FK-8
48 IDA |
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Nater Samba Member
Joined: June 19, 2006 Posts: 493
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Posted: Thu Oct 20, 2011 6:58 pm Post subject: |
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slalombuggy wrote: |
To me, it isn't worth buying a part like that if you aren't going to do it right. This ain't the time to get lazy, I used a small tubing cutter and did all 8 of mine in pretty quick time. Take the time, do it right, you did spend good money to buy good parts.
brad |
X2 + the tubing cutter doesn't put all that heat in the tube. |
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jsturtlebuggy Samba Member
Joined: August 24, 2005 Posts: 4496 Location: Fair Oaks/Orangevale, CA
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Posted: Thu Oct 20, 2011 7:08 pm Post subject: |
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After finding out what Jake Raby uses for cutting push rods,
and arrow cutter.
I went and bought one an it works great and fast.
I use to use a lathe and the arrow cutter take less time to set up and all push rods are the same length. _________________ Joseph
Fair Oaks/Orangevale, CA
Elrod Motorsports
Motion Tire Motorsports
Having fun with Dune Buggies since 1970
Into Volkswagens since 1960 |
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yamaducci Samba Member
Joined: March 30, 2010 Posts: 2335 Location: Mount Airy, Maryland
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Posted: Thu Oct 20, 2011 7:40 pm Post subject: |
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Hophead wrote: |
I have not cut anything yet... was going to use a chop saw. I was afraid a pipe cutter would wander down the taper.
Even if I cut the full amount off of one end there is still some taper left. It is not that I am lazy or in a hurry. It is just setting up the saw for one cut would reduce the chance of introducing error accross the set of eight.
Where is the taper of benefit anyways? Out at the head?
Also, How do you ensure equal length with a tubing cutter? With a chop saw i was going to set up a flip stop. |
Yes the benefit of a taper is out at the head.
Making them dual-taper just lightens them and makes them a no-brainer for which side goes where. If you do cut one side; put the cut side in the lifter cup, allowing the most taper to be out at the head where it's most beneficial. _________________ -John Cox
My 2498 Turbo Re-Build Thread: http://www.thesamba.com/vw/forum/viewtopic.php?p=5578697#5578697
3rd Brake Light Safety Stars- I still have a couple with blue light left. Email me if interested. |
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Eaallred Samba Member
Joined: May 18, 2003 Posts: 5756 Location: West Valley City, Utah
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Posted: Thu Oct 20, 2011 8:02 pm Post subject: |
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yamaducci wrote: |
Making them dual-taper just lightens them |
No. Tapering the pushrod "triangulates" the structure of it (i.e. a cone rather than a cylinder) making them MUCH stronger. It is not done for weight reduction. _________________ Eric Allred
You have to remember something: Everybody pities the weak; Jealousy you have to earn. |
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yamaducci Samba Member
Joined: March 30, 2010 Posts: 2335 Location: Mount Airy, Maryland
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Posted: Thu Oct 20, 2011 8:11 pm Post subject: |
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Eaallred wrote: |
yamaducci wrote: |
Making them dual-taper just lightens them |
No. Tapering the pushrod "triangulates" the structure of it (i.e. a cone rather than a cylinder) making them MUCH stronger. It is not done for weight reduction. |
Yes Eric I understand the centerline priciple here. I guess I should not have dumbed it down. Cutting Both sides equally is Ideal but cutting one side will leave the largest diameter to work with I.E. a triangle; yet it will still have taper where it counts.
Either cut won't be noticed until you run K800 or better springs at 9000 RPM+
I doubt the OP is in that arena; I could be wrong. _________________ -John Cox
My 2498 Turbo Re-Build Thread: http://www.thesamba.com/vw/forum/viewtopic.php?p=5578697#5578697
3rd Brake Light Safety Stars- I still have a couple with blue light left. Email me if interested.
Last edited by yamaducci on Thu Oct 20, 2011 8:29 pm; edited 1 time in total |
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DarthWeber Samba Member
Joined: November 24, 2007 Posts: 7543 Location: Whittier,CA
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Posted: Thu Oct 20, 2011 8:26 pm Post subject: |
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jsturtlebuggy wrote: |
I use to use a lathe and the arrow cutter take less time to set up and all push rods are the same length. |
Is this it?
_________________
Mitey62 wrote: |
Swapped the Compufire for a Bosch blue and some points I had sitting around, started 1st crank. Took her out for a drive, pulls harder, more RPM, and runs smoother. I think I'll be sticking with points from now on. |
RockCrusher wrote: |
JB weld the case halves....that'll keep the fretting to a minimum. |
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jsturtlebuggy Samba Member
Joined: August 24, 2005 Posts: 4496 Location: Fair Oaks/Orangevale, CA
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Posted: Thu Oct 20, 2011 9:25 pm Post subject: |
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Darth,
That not really an arrow cutter. Yes I see on line that someone is using it for that. I bought one of those cutters for from Harbor Feight and returned it the same day. I was using to cut brake line and little cog belt keep slipping. Piece of crap.
I found my arrow cutter at Cabela's on line.
It is not cheap, $159. It the 8,000RPM model without the dust collector.
looking on line tonite, Cabela's has a $20 rebate on spending over $150
There are more expensive ones, I don't know how much better they are.
It works and I have to do very little to clean up the end of the push rod after cutting it.
When I take up bow hunting it will a dual purpose tool. _________________ Joseph
Fair Oaks/Orangevale, CA
Elrod Motorsports
Motion Tire Motorsports
Having fun with Dune Buggies since 1970
Into Volkswagens since 1960 |
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Nater Samba Member
Joined: June 19, 2006 Posts: 493
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