1
Decoding/Numbers / Re: Caveat Emptor...scam?
« on: April 12, 2024, 02:53:29 PM »
The listing has ended. Very well might have been a scam.
Richard
Richard
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2
Garage Talk / Re: 1968 Chevy CamaroZ28 for sale
« on: March 27, 2024, 12:53:25 AM »Why would a car listed in Minneapolis Mn craiglist be located in Kansas. Sounds like a scam! Buyer beware!
A consignment?
Richard
3
General Discussion / Re: Interesting period photos.... :)
« on: February 14, 2024, 07:23:41 PM »
1967 Road America Can-Am pace lap. (Scroll picture left-right.)
McLaren Hulme
Gurney Follmer
Donohue Parsons
Surtees Revson
Hall Motschenbacher
Scott Hayes
Hansen Morin
Posey Barber
.
.
.
Finishing order: Hulme, Donohue, Surtees, Hall, Scott, Hansen, Barber, Morley, Motschenbacher, Hayes
McLaren Hulme
Gurney Follmer
Donohue Parsons
Surtees Revson
Hall Motschenbacher
Scott Hayes
Hansen Morin
Posey Barber
.
.
.
Finishing order: Hulme, Donohue, Surtees, Hall, Scott, Hansen, Barber, Morley, Motschenbacher, Hayes
4
General Discussion / Re: Interesting period photos.... :)
« on: February 08, 2024, 07:30:57 PM »
Not very good quality - tv screen shots from the 1969 movie: "The Racing Scene" with James Garner.
Pace lap from the 1969 St. Jovite F5000 SCCA Formula A Continental Championship, 7 September 1969,
Now known as Circuit Mont-Tremblant, it is a 2.621 mile road course located approximately 81 miles north of Montreal, Quebec, Canada.
'69 Camaro Pace Car leading the field.
Richard
Pace lap from the 1969 St. Jovite F5000 SCCA Formula A Continental Championship, 7 September 1969,
Now known as Circuit Mont-Tremblant, it is a 2.621 mile road course located approximately 81 miles north of Montreal, Quebec, Canada.
'69 Camaro Pace Car leading the field.
Richard
5
Maintenance / Re: electrical issue with console gauges
« on: January 30, 2024, 04:40:39 PM »
This has been posted before - perhaps may be of some help.
Richard
Richard
6
General Discussion / Re: 1969 driveshafts
« on: January 19, 2024, 04:29:13 AM »
.
I agree - there could have been a vibration problem in the drive train. Offsetting the yokes to “fix” a drivetrain vibration problem would have been an inexpensive course of action.
If that was the case, then nothing was “fixed” - just band aided - with what was possibly a drivetrain vibration issue shifted to something else. The drivetrain only had to survive long enough to finish a Trans Am race or last past the warranty period.
It would be insightful to know - over the years how may transmissions (aluminum cases) and rear ends have failed due to the induced stresses and torsional vibrations originating from offset propeller shaft yokes operating under heavy acceleration, load, and higher rpm’s.
Just because Chevy did it doesn’t make it golden.
I have read the full report. It is a very good report for documenting what Chevy did. However, there is nothing in the report that states why, gives a reason, or an engineering explanation for why the SB driveshafts had the yokes clocked at 32 degrees.
And by the way, I have been researching mechanical engineering principles since 1971 (53 yrs) and have been a registered professional mechanical engineer since 1980. I have more than a basic understanding of how a propeller shaft operates.
Richard
I agree - there could have been a vibration problem in the drive train. Offsetting the yokes to “fix” a drivetrain vibration problem would have been an inexpensive course of action.
If that was the case, then nothing was “fixed” - just band aided - with what was possibly a drivetrain vibration issue shifted to something else. The drivetrain only had to survive long enough to finish a Trans Am race or last past the warranty period.
It would be insightful to know - over the years how may transmissions (aluminum cases) and rear ends have failed due to the induced stresses and torsional vibrations originating from offset propeller shaft yokes operating under heavy acceleration, load, and higher rpm’s.
Just because Chevy did it doesn’t make it golden.
If you guys have time, read the full report.
We researched this for over 10 years.
I have read the full report. It is a very good report for documenting what Chevy did. However, there is nothing in the report that states why, gives a reason, or an engineering explanation for why the SB driveshafts had the yokes clocked at 32 degrees.
And by the way, I have been researching mechanical engineering principles since 1971 (53 yrs) and have been a registered professional mechanical engineer since 1980. I have more than a basic understanding of how a propeller shaft operates.
Richard
7
General Discussion / Re: 1969 driveshafts
« on: January 19, 2024, 12:21:52 AM »Both my 69 Van Nuys small block manual trans cars were offset 32 degrees. Original driveshafts. Pretty normal on First gen Camaros.
I know we have beaten this to death in the past....the report referenced in the 1st reply details what Chevy did.
From the perspective of this retired registered professional mechanical engineer and strictly from looking at how to properly set up a propeller (drive) shaft, the idea of offsetting the yokes makes no sense. The whole idea of a propeller shaft, beside transmitting torque, is to keep the angular velocities the same (or relatively so) at both ends of the drive shaft to avoid torsional vibration issues. This is accomplished by keeping the angle between the transmission output and the drive shaft and the drive shaft and rear end as nearly equal as possible at all times - including when the rear end is moving up and down goin over bumps, etc. Offsetting the yokes 32 degrees works against this fundamental principle of keeping the operating angles, as well as the angular velocities, the same at both ends of the driveshaft.
My guess is that Chevy discovered a vibration issue and the easy fix it was to offset the yokes which effectively stiffened the driveshaft and shifted the vibration to a higher frequency that was no longer excited by the drive train - as opposed to changing the design of the driveshaft itself which would have been a more costly endeavor.
I put mine in line over 30 years ago. But for those who want "factory correct"......
Richard
8
General Discussion / Re: Homepage Pics - new post
« on: December 29, 2023, 04:13:36 PM »
69 RS if you need it.
Richard
Richard
9
General Discussion / Re: On the hunt
« on: December 28, 2023, 03:37:52 PM »
I’ve checked Nevada DMV and you need both the VIN and current license plate information. We have the VIN - if we had the current plate I believe we could figure out where the car is.
Richard
Richard
10
Maintenance / Re: L78 Rough Idle and Stumbling
« on: December 05, 2023, 09:28:41 PM »
I would think if the Pertronix module in the distributor has gone bad that the engine would not run at all.
Richard
Richard
11
General Discussion / Re: Power Steering fluid or ATF
« on: December 02, 2023, 09:38:23 PM »
The front of the ‘69 AIM refers you to section N40 - Power Steering.
AIM calls out ATF for small block.
Capacity is shown a couple of pages earlier for L6 power steering - 0.285 gallons or about 1.14 quarts (2nd pic).
Richard
AIM calls out ATF for small block.
Capacity is shown a couple of pages earlier for L6 power steering - 0.285 gallons or about 1.14 quarts (2nd pic).
Richard
12
General Discussion / Re: Power Steering fluid or ATF
« on: December 02, 2023, 02:45:10 AM »
From the ‘69 Chassis Service Manual section on Power Steering. I use ATF in my ‘69 RS due to concern that over the counter ps fluid today might not be what GM had in mind back in the day.
Also simplified what fluids I needed to keep on hand - same as what goes in the Powerglide.
Richard
Also simplified what fluids I needed to keep on hand - same as what goes in the Powerglide.
Richard
13
Restoration / Re: My 1969 Camaro will not shut off
« on: November 30, 2023, 04:13:49 PM »Is it running on like dieseling, or running like normal? If running normally, it could be your ignition switch. Dieseling could be a timing issue.
I agree - if it running like normal, then the ignition switch is not shutting of the power when you turn it off.
Richard
14
Maintenance / Re: Wiring Connections at Firewall Behind Fuse Panel
« on: November 04, 2023, 09:37:18 PM »
If it were me, I’d remove the power brake booster and master cylinder in order to have good access in order to separate the bulkhead connector and check/clean everything as needed. You could easily have other terminal corrosion issues that need to be dealt with.
Richard
Richard
15
General Discussion / Re: 68 console clock
« on: October 30, 2023, 03:07:54 PM »Does anyone know which manufacturer made them. I have one I’d like to get working, but can’t find a kit. Any help is appreciated.
As far as ‘68 Camaro - I don’t know. The in dash clock for my ‘66 Chevelle was made by Westclox. My fix (back in the mid 90’s) was to send out the clock and replace the old, broken, mechanical movement with a quartz movement.
Richard