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ZEKE65 Samba Member
Joined: December 16, 2018 Posts: 334 Location: Right Coast, Florida
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Posted: Tue Apr 20, 2021 10:32 am Post subject: New aluminum pushrod tip pulled out ?? |
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I ordered an expensive set of dual tapered aluminum pushrods cut to length and assembled before being shipped to me. When I pulled one of the oily pushrod out of the plastic bag they were shipped in, the steel tip pulled right out of the aluminum tube. I tried pulling on the rest and three came right out with my oily fingers. This does not sound right to me. how can I run these if the tip has a chance of moving with the clearance? It would beat the end of the pushrod. _________________ 1965 VW Sedan, 1968 C10 Step BB, 99 C5 |
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Dan Ruddock Samba Member
Joined: October 25, 2012 Posts: 3574 Location: Sarasota, in my adopted state of Florida
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Posted: Tue Apr 20, 2021 10:38 am Post subject: Re: New aluminum pushrod tip pulled out ?? |
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That is I want my $$$ back kind of incompetence. I won’t ask who did it. Check my ads for good pushrods. With them like yours they will pound and keep getting shorter. Dan |
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bugguy1967 Samba Member
Joined: January 16, 2008 Posts: 4338 Location: Los Angeles, CA 90016
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Posted: Tue Apr 20, 2021 12:27 pm Post subject: Re: New aluminum pushrod tip pulled out ?? |
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They didn't use a good interference fit. Return them. Those CB ones aren't very strong by the way. They can only handle certain cam.profiles and pressures. _________________ "A petrol engine can start readily, run smoothly and give every appearance of being in good order, without necessarily being in good tune." - Colin Campbell, "The Sportscar Engine" |
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Ohio Tom Samba Member
Joined: February 09, 2006 Posts: 1657 Location: Marshallville Ohio
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Posted: Tue Apr 20, 2021 12:27 pm Post subject: Re: New aluminum pushrod tip pulled out ?? |
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That will most certainly fail like that.
Not the first time I have seen that either. |
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74 Thing Samba Member
Joined: September 02, 2004 Posts: 7375
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Posted: Tue Apr 20, 2021 1:20 pm Post subject: Re: New aluminum pushrod tip pulled out ?? |
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Call whomever you purchased them from and return them for a new set. They should be interference fit like Tabari indicated. |
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ZEKE65 Samba Member
Joined: December 16, 2018 Posts: 334 Location: Right Coast, Florida
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Posted: Tue Apr 20, 2021 4:49 pm Post subject: Re: New aluminum pushrod tip pulled out ?? |
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Not CB _________________ 1965 VW Sedan, 1968 C10 Step BB, 99 C5 |
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bugguy1967 Samba Member
Joined: January 16, 2008 Posts: 4338 Location: Los Angeles, CA 90016
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Posted: Tue Apr 20, 2021 6:01 pm Post subject: Re: New aluminum pushrod tip pulled out ?? |
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Regardless of the quality, the machining was done incorrectly. _________________ "A petrol engine can start readily, run smoothly and give every appearance of being in good order, without necessarily being in good tune." - Colin Campbell, "The Sportscar Engine" |
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mark tucker Samba Member
Joined: April 08, 2009 Posts: 23937 Location: SHALIMAR ,FLORIDA
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Posted: Wed Apr 21, 2021 3:08 pm Post subject: Re: New aluminum pushrod tip pulled out ?? |
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ive had many cr pushrods do the same.I went to micing the ends...somebody needs to learn how to cut the rifght size.I wooda thought they were cnc done...but apparently won long chong does them by hand and hasent a mic.... and thats form 3 different brand names for the .035 cr pushrods, thats when I stoped using them for even the mild stuff. the 058 seems to be just fine. |
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-Alex77- Samba Member
Joined: December 09, 2008 Posts: 513 Location: Finland
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Posted: Thu Apr 22, 2021 1:26 am Post subject: Re: New aluminum pushrod tip pulled out ?? |
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CB says that their alu pushrods are made from supersecret material. It is either 2000 series (2014?) or 7000 series (7075).
JPM and Logmech tapered pushrods are made from 7075 and they work. 7075 is little bit stronger than 2014. 7000 series offers a little bit better fatigue strength too.
I think at some point CB pushrods were made from 2000 series alloy.
https://www.makeitfrom.com/compare/2014-T6-Aluminum/7075-T6-Aluminum _________________ Lasercut parts and CAD design |
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bugguy1967 Samba Member
Joined: January 16, 2008 Posts: 4338 Location: Los Angeles, CA 90016
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Posted: Thu Apr 22, 2021 12:31 pm Post subject: Re: New aluminum pushrod tip pulled out ?? |
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-Alex77- wrote: |
CB says that their alu pushrods are made from supersecret material. It is either 2000 series (2014?) or 7000 series (7075).
JPM and Logmech tapered pushrods are made from 7075 and they work. 7075 is little bit stronger than 2014. 7000 series offers a little bit better fatigue strength too.
I think at some point CB pushrods were made from 2000 series alloy.
https://www.makeitfrom.com/compare/2014-T6-Aluminum/7075-T6-Aluminum |
CB definitely isn't 7075. Cuts too easy. I cut some 7075 Logmechs, and they squealed like SS the entire time! _________________ "A petrol engine can start readily, run smoothly and give every appearance of being in good order, without necessarily being in good tune." - Colin Campbell, "The Sportscar Engine" |
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jimmyhoffa Samba Member
Joined: February 16, 2014 Posts: 1047 Location: St. Louis
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Posted: Thu Apr 22, 2021 12:43 pm Post subject: Re: New aluminum pushrod tip pulled out ?? |
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Agreed, I CNC and manually machine 7075, 6061 and cast aluminum plate all day at work. I am running CBs straight alum. pushrods on a Web 218 profile with Scat single springs, no issues yet, but when I turned them to length in my lathe I KNOW they were softer than 7075-T651
That said, they had a nice interference fit for the tips and I BANG this engine off the 5800RPM rev limiter every time I drive it. I have a 2-step rev limiter I use all the time too. Valve clearances haven't moved. _________________ 1974 Chenowth 2RL #1244 Street Legal
My other car isn't ridiculous. |
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