I'm going to disagree on this one. The roll center on a torque tube rear end runs at the height of the universal joint. The roll center with a Panhard bar is where a line directly up from the axle crosses a line from the center of the u-joint to the center of the Panhard bar. Basically, this is right at the height of the Panhard bar, a good 6 inches above the u-joint. The closer the roll center is the the CG, the lower the roll. 6 inches is a pretty good improvement.
Rear Panhard Bar ?
- Thread starter duke36
- Start date
I'm going to disagree on this one. The roll center on a torque tube rear end runs at the height of the universal joint. The roll center with a Panhard bar is where a line directly up from the axle crosses a line from the center of the u-joint to the center of the Panhard bar. Basically, this is right at the height of the Panhard bar, a good 6 inches above the u-joint. The closer the roll center is the the CG, the lower the roll. 6 inches is a pretty good improvement.
Purdy Swoft
Well-known member
The backend can rock side to side on the rear spring shackles . The panhard bar holds the rear axle steady on sharp turns
pooch
Well-known member
Not really, more like the body/chassis/spring can rock side to side on the backend.
updraught
Well-known member
" ... The roll center on a torque tube rear end runs at the height of the universal joint."
That's up near the gearbox and chassis rail.
"The roll center with a Panhard bar is where a line directly up from the axle crosses a line from the center of the u-joint to the center of the Panhard bar. Basically, this is right at the height of the Panhard bar, a good 6 inches above the u-joint. The closer the roll center is the the CG, the lower the roll. 6 inches is a pretty good improvement."
That's half way between the diff and chassis rail?
The center of gravity will be higher for a sedan than say a speedster.
That's up near the gearbox and chassis rail.
"The roll center with a Panhard bar is where a line directly up from the axle crosses a line from the center of the u-joint to the center of the Panhard bar. Basically, this is right at the height of the Panhard bar, a good 6 inches above the u-joint. The closer the roll center is the the CG, the lower the roll. 6 inches is a pretty good improvement."
That's half way between the diff and chassis rail?
The center of gravity will be higher for a sedan than say a speedster.
You're right. That 6 inch estimate may be quite a way off. I may need to crawl underneath and look around.
Y-Blockhead
Well-known member
Synchro, I gave it my best 'shot'. Hard to get a good picture as it is above the rear axle. This picture is looking toward the rear of my car.
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hardtimes
Well-known member
Hey Simon,
Thanks for sharing drawing !
Is there a set distance/location on the right frame rail where the bar attachment is shown ? Or, can it be randomly placed in the general vicinity shown In drawing ? Is the length of bar set, as made and sold by vendors,
or is a longer bar better ??
hardtimes
Well-known member
Synchro, I gave it my best 'shot'. Hard to get a good picture as it is above the rear axle. This picture is looking toward the rear of my car.
What picture ?
Y-Blockhead
Well-known member
Can't see it? I see it... I can even see it in your post.
If you can't see it go to my picture album. https://www.fordbarn.com/forum/album.php?albumid=3320
https://www.fordbarn.com/forum/picture.php?albumid=3320&pictureid=39757
Hardtimes, that drawing is Bass Ackwards. The Panhard bar available form the vendors mounts to the LR shock mount and the center section of the rear axle.
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Y-Blockhead
Well-known member
Picture where it mounts to left rear shock.
And center section.
And center section.
pooch
Well-known member
Dunno about the aftermarket Model A panhard bars, but as to a general bar, the longer the betterr so to minimise arc length change movement.
And the bar should be up hill to chassis a bit ( in height elevation) at normal riding height loaded, so its working life going over bumps is in the best arc.
And the bar should be up hill to chassis a bit ( in height elevation) at normal riding height loaded, so its working life going over bumps is in the best arc.
Synchro909
Well-known member
Thanks for your efforts, Y Blockhead but I can't get to see anything on the album either - never have on this forum. Don't know whether it's something I should do here or something should be done behind the scenes.
Does anybody else either have a picture or have a suggestion as to how Y might be able to load the pictures?
Does anybody else either have a picture or have a suggestion as to how Y might be able to load the pictures?
updraught
Well-known member
Can't see it? I see it... I can even see it in your post.
https://www.fordbarn.com/forum/album.php?albumid=3320
https://www.fordbarn.com/forum/picture.php?albumid=3320&pictureid=39757
The first link gives:
"Invalid Album specified. If you followed a valid link, please notify the administrator"
The second is blank.
In your public profile there is only statistics and contact info. Nothing else.
Other users I checked look OK.
Maybe check your "profile privacy"?
Y-Blockhead
Well-known member
Well sorry guys. I never had this problem before. Maybe it has something to do with the Ford Barn server upgrade?
Sooo, let us try Flickr... Please let me know if this works. I can see all the other pictures I posted just fine.
Sooo, let us try Flickr... Please let me know if this works. I can see all the other pictures I posted just fine.
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SSsssteamer
Well-known member
I followed this Panhard post from the beginning. Having driven our 1929 Tudor for 50 years, at 45+ mph on the country roads, the Tudor can be a real challenge to keep it on our side of the road. It always dips and dives all over the place. It has all new spring shackles, shock absorbers and the tudor is in great shape. I ordered the Panhard from Snyders (on line) on Sunday and I received it on Wednesday by USPS. Cost plus shipping came to about $150. It took about 30 minutes to install and then I test drove our Tudor. I just got back from driving on the same country roads. The Tudor showed about a 90% improvement on the dipping and diving. Body roll was greatly reduced too. It was money well spent.
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Y-Blockhead
Well-known member
Not sure how clear but...
This one shows how it is mounted to the LR Shock
and this one shows the rear axle center section
Sorry they are not clearer, hard to take pictures laying on my back...
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Synchro909
Well-known member
Thanks for the pics - clear enough for me.