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#31
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69 SS/RS 396 M20 X22 Nor 12B,72B,712 bought 1979 FULL OWNER HISTORY 69 Dick Harrell tribute Day II 427 M20 4.10 X11 76 orig pnt, 711 67 Super Stock 302 Camaro re-creation |
#32
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I was told the halves were forged and then spun in order to achieve the smoothed steps. Maybe that was bad info I got on the process? In either case...they're light and they are still the best looking rivet style aluminum rim out there.
Thanks for the education Bentley.
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I like solid lifter cars, big cams and cars w/ 3 pedals in them. |
#33
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Maybe it was the rotary process that led to me being told the forgings were spun before being pressed. I've seen pictures of the 2 story press used to forge the wheels and it was pretty cool. I'm assuming the pictures and the process details below are the technologies that were used for the Auto Drag and Convo Pro designs?
CENTER LINE'S ROTARY FORGED TECHNOLOGY Patent # 4,936,129 Center Line has designed a rotary forging press, the only one of its kind in the world, to compress a solid billet of aluminum with 4,000 tons of force, at 300 revolutions per minute. Not only does this process rearrange the aluminum molecules, but it also aligns them in a circular pattern thereby adding strength. As a result, the rotary forged wheel has a much tighter grain structure and is significantly lighter weight than a cast wheel which requires greater mass due to its inherent porosity. 1. The aluminum billet is run through the oven and heated to 900 degrees. 2. The nearly red-hot billets are transferred from the oven into the rotary forging press. 3. Spinning at 300 revolutions per minute, the billet is compressed into the die with 4,000 tons of force. This process forges the aluminum molecules into a tight grain structure arranged in a circular pattern thereby allowing Center Line to build incredibly light-weight, strong wheels. 4. The beginnings of a wheel in its forged state just as it is about to be removed from the rotary forging press. 5. Next, the aluminum forging must be split-spun to form the rim thereby completing the structure of a one-piece rotary forged wheel.
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I like solid lifter cars, big cams and cars w/ 3 pedals in them. |
#34
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The Cragar “trick” was spun aluminum. And that is why it was stated to not use on the street. It was fine in straight line use, but repetitive turning would pull the lug nuts through the wheel, along with stress cracks and bending or warping the rim. C-lines could run on the street and tubeless, I don’t believe tricks could run tubeless either?
Listen, I am no expert on these wheels. When I was 18, in 1979, I had the dream job of an 18 year old gear head. And that job was working in a speed shop! Between reading catalogs and talking to reps, I picked up what I know. I was a sponge for this information.
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69 SS/RS 396 M20 X22 Nor 12B,72B,712 bought 1979 FULL OWNER HISTORY 69 Dick Harrell tribute Day II 427 M20 4.10 X11 76 orig pnt, 711 67 Super Stock 302 Camaro re-creation Last edited by bbbentley; 12-02-2017 at 03:21 AM. |
#35
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We started building and racing in the day 3 era. I had a memory nudge from my brother. The car was flat towed with Centerline wheels. We did have a rivet failure on one of the 15 X 4 rims early on that was replaced by the speed shop. The rear center line wheels were not raced on because we did not want to drill them for screws so we ran steel rims out back. So they held up from the early 80's to today seeing tack and street duty. I would still drive with care as with any dual purpose wheel.
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69 442 post bench 3 pedal Last edited by Bernhard; 12-02-2017 at 04:57 PM. |
#36
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Chevelle sporting Centerlines early 80's
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#37
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Note that Jenkins used the chrome bolt on center caps on the'70..
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#38
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Verne Grady now owns the Cragars and slicks |
#39
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__________________
I like solid lifter cars, big cams and cars w/ 3 pedals in them. |
#40
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Still have it. Replaced the hood, got rid of the roll bar and it's back on the street with an '09.
Verne |
The Following User Says Thank You to Verne_Frantz For This Useful Post: | ||
NorCam (12-16-2017) |
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