Home » Public Forums » GMCnet » [GMCnet] Longer sustained high speeds get very complex. And costly. (Subject title change )
| [GMCnet] Longer sustained high speeds get very complex. And costly. (Subject title change ) [message #360536] |
Sat, 05 December 2020 09:46  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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I own a 69 COPO Yenko Stinger. Built from a Corvair. Is the only 69 Stinger ever built. Ford had GM build the car off of the production line. As it was built strictly for off road use only. And couldn't pass any emission, or safety standards. Then shipped to the Yenko dealership for completion. Ford was developing a small race car. That required a 13-inch race tire. That could run in the 130, to 140 MPH range. Ford didn't have a car on 13-inch tires that could operate at those speeds. At just under 8,000 RPM's in 4th gear. It has an idle of 2,200 RPM's. Its power range starts at 5,500 RPM's. With no NOS, or turbo charging. Just 4 way over bored carbs.173 cubic inches. To build the cylinder heads with today's money. Would cost about $28,000. The 4 carbs. $11,000. I've had it on the Talladega track about 9 years ago. With an average lap speeds of 142.2 MPH. 138.4 with the right window down. To listen to it next to the outside wall.
When I got it. I got an odometer statement from Goodyear showing 2234 miles. All these miles were run on Goodyear's 5-mile oval test track in West Texas. At over 135 MPH. This was also the tire test car for the development of the studded snow tire. It had 1/4-inch steel shields in each fender well for these tests. With it's prominance. It has an estimated value of well north of $500,000. But I still road race it on road race tracks around the country. It's been written up in many books, and magazines. Been on the cover of Hemmings Classic Car Magazine. May 2013. Our 78 Royale 403 is the tow truck for the 24 ft enclosed trailer. That I haul the car in.
Bob Dunahugh
78 403 Royale
4 COPO Yenkos. Anb way too many restored convertibles in the collection.
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| Re: [GMCnet] Longer sustained high speeds get very complex. And costly. (Subject title change ) [message #360559 is a reply to message #360536] |
Sat, 05 December 2020 21:27  |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Bob,
Very interesting what was done with the Covair.
On Sat, Dec 5, 2020 at 7:46 AM Bob Dunahugh via Gmclist <
gmclist@list.gmcnet.org> wrote:
> I own a 69 COPO Yenko Stinger. Built from a Corvair. Is the only 69
> Stinger ever built. Ford had GM build the car off of the production line.
> As it was built strictly for off road use only. And couldn't pass any
> emission, or safety standards. Then shipped to the Yenko dealership for
> completion. Ford was developing a small race car. That required a 13-inch
> race tire. That could run in the 130, to 140 MPH range. Ford didn't have a
> car on 13-inch tires that could operate at those speeds. At just under
> 8,000 RPM's in 4th gear. It has an idle of 2,200 RPM's. Its power range
> starts at 5,500 RPM's. With no NOS, or turbo charging. Just 4 way over
> bored carbs.173 cubic inches. To build the cylinder heads with today's
> money. Would cost about $28,000. The 4 carbs. $11,000. I've had it on the
> Talladega track about 9 years ago. With an average lap speeds of 142.2 MPH.
> 138.4 with the right window down. To listen to it next to the outside wall.
> When I got it. I got an odometer statement from Goodyear showing
> 2234 miles. All these miles were run on Goodyear's 5-mile oval test track
> in West Texas. At over 135 MPH. This was also the tire test car for the
> development of the studded snow tire. It had 1/4-inch steel shields in each
> fender well for these tests. With it's prominance. It has an estimated
> value of well north of $500,000. But I still road race it on road race
> tracks around the country. It's been written up in many books, and
> magazines. Been on the cover of Hemmings Classic Car Magazine. May 2013.
> Our 78 Royale 403 is the tow truck for the 24 ft enclosed trailer. That I
> haul the car in.
>
> Bob Dunahugh
> 78 403 Royale
> 4 COPO Yenkos. Anb way too many restored convertibles in the collection.
>
>
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Longer sustained high speeds get very complex. And costly. (Subject title change ) [message #360563 is a reply to message #360536] |
Sun, 06 December 2020 08:14 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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Both Bob's and JimK's statements are very true.
At one time, I was part of a crew (Not the driver) that raced a Karman Ghia shaped car. At lot of it was like the original and a lot more was not.
When we ran road courses, there were no major issues because the sustained speeds were never that high. We were invited by the New Jersey state highway department to assist them in some testing of new pavement types. What they needed was cars that could try to stop from speeds in excess of 100. They were hoping for 150. We did the 150 part of their test, and that also clearly indicated that brakes and tires were an issue because it took me (I did drive that test) most of a quarter of a mile to stop the car.....
I would not have guessed that....
But, due to a mistake on someone's part, we got lined up for a race on a high speed oval. We got the car set up but our driver had not arrived yet, so I (foolish me) took the car out on the clear track just for a test run. I got settled in and things were ok, then I decided to go for a hot lap. This was an eye opener. With speeds up in the 150+ range, while stable the cars systems were starting to get out of control, the engine was way hot, I was starting to loose oil pressure and fuel pressure, at the middle of the last turn, I went to WOT.
The Trap recorded a speed of 168.
I was trying to not be terrified. What instruments I could see were either railed high or nearly and my peripheral vision was gone to a blur.
I shut down and coasted to the pit. That was almost the full length of the track.
Inspectors said that two of the tires were about to fail. The brakes were OK, but the front disks were blue and I didn't remember even using the brakes. The oil in both the engine and the transmission were badly burned. The transmission oil smelled really bad. The team dropped out of that race and I never again drove the car at speed. It seems that not only is the machinery stressed by the high loads, so is the driver.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Longer sustained high speeds get very complex. And costly. (Subject title change ) [message #360567 is a reply to message #360563] |
Sun, 06 December 2020 09:02 |
Olly Schmidt
Messages: 1265
Registered: February 2014
Location: Germany and Scottsville, ...
Karma: 8
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Senior Member |
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Matt,
On 06.12.20 15:14, Matt Colie via Gmclist wrote:
> We did the 150 part of their test, and that also clearly indicated that brakes and tires were an issue because it
> took me (I did drive that test) most of a quarter of a mile to stop the car.....
> I would not have guessed that....
what you saw is considered normal.
The stopping distance, reaction time plus braking time, in Germany is
calculated in a way that if you go 230km/h (roughly 150mph), a regular
braking distance is 529m, emergency braking 265m. But if you add the
reaction time to it, the total stopping distance is 600m and 334m.
Now you know, why I only go 200mph on the Autobahn at night, when I can
see for a long distance :-D
--
Best regards
Olly Schmidt
PGP KeyID: 0x4196BF22
'76a 26' Eleganza II - Virginia, US
'73 23' Sequoia - Schleswig-Holstein, Germany
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Best regards
Olly Schmidt
PGP Key ID: 0x18a9 3a1f 4196 bf22
'76a Eleganza II, VA
'73 Sequoia, SH, Germany
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| Re: [GMCnet] Longer sustained high speeds get very complex. And costly. (Subject title change ) [message #360572 is a reply to message #360536] |
Sun, 06 December 2020 12:06 |
kingd
Messages: 592
Registered: June 2004
Karma: 2
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Senior Member |
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I have a 1976 SOB 26 ft MH. It's built on a truck chassis and turns 3000 RPM at 60 MPH. I wish it had a final drive that
allowed less RPM at highway speeds. I thought about a GEAR VENDOR overdrive unit but never got around to it. My race car Datsun 510 regularily
got to 7500 RPM. Only special parts in the bottom end were forged pistons. That engine didn't go below 5000 RPM and was shifted at at 7500 PM
and pulled 7500 RPM at the end of the long straight. It was a wet sump and with nothing special to enhance oil drain back. I guess some engines just don't mind higher RPM, but of course it is a tiny engine compared to an OLDS 455.
DAVE KING
lurker, wannabe
Toronto, Ontario, Canada
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