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PostPosted: Mon Jul 16, 2018 7:02 am 
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EFI Slant 6
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Joined: Thu Jan 13, 2005 1:01 pm
Posts: 367
Location: waynesboro PA
Car Model*: 72' Dart Swinger / 62' Valiant
So, I posted a reply yesterday and apparently it disappeared. So here we go again :D

Rob, The Valiant is basically ready. I need to re-jet the carburetors and set the Caltracs and then load it on the trailer. I'm not making any other changes till I get some more passes. The control arm bushings were completely gone in some and broke in little pieces in others so hopefully it really tightens the front end back up. I remember feeling like the car was swaying a lot more than normal but thinking it was only the low tire pressure. Hopefully the new bushings help with that swaying.

Thanks for the help on the Valiant Greg. I definitely had a good time working on the car, hanging out and going for an early evening cruise in your Dart. Its always a good time having you stay here with us. It definitely is more fun working on these things together...... If it wasn't for working with my Dad, none of my cars would be running. :lol:

Dennis, I might be able to put the car on the scales before this weekend. Is there a different way to set the caltracs with 4 wheel scales? If not I will just set them like you suggested before and see what happens.
I had the tires up over 14lbs of pressure to start with accidentally. (I checked the in the morning but forgot to check them before the first pass and it was much hotter). At 14 lbs it spun very badly. Then I dropped to 9 lbs and it improved so I dropped to 8lbs and it seemed a little better. All of the videos i posted were with 8 lbs of air pressure. I didn't go any lower because it was swaying so much on the top end.

I'm looking forward to seeing everyone this weekend and hopefully getting this thing dialed in a little better on the launch.

_________________
Ryan Covalt
62 Plymouth Valiant Race Car 2170# 11.22 @ 115.86 MPH 1/4 Mile Best
72' Dart Swinger Street Car, 4 spd, 3330# 14.061 @96.58 1/4 mile Best


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PostPosted: Mon Jul 16, 2018 9:27 am 
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Joined: Thu Oct 17, 2002 7:27 pm
Posts: 11914
Location: Park Forest, Illinoisy
Car Model*: 68 Valiant
Air pressure is something you'll need to play with as you get the car less violent, especially if it's wandering around downtrack.

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PostPosted: Fri May 10, 2019 5:17 pm 
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Turbo Slant 6
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Joined: Mon Jan 12, 2015 5:55 am
Posts: 798
Location: Brightwood, VA
Car Model*: 1965 Plymouth Belvedere I
Could you use a pair of these from a Dodge pickup? You could flip them and clamp (on top) them wherever you needed to on the axle. Admittedly, they are a little clunky for a race car but may be good for test purposes.
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-Matt
http://www.MattmansMopars.com
Strive for Excellence, not Perfection.


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PostPosted: Fri May 10, 2019 10:12 pm 
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EFI Slant 6
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Joined: Thu Jan 13, 2005 1:01 pm
Posts: 367
Location: waynesboro PA
Car Model*: 72' Dart Swinger / 62' Valiant
I need to post some pictures of how the suspension is set up now.

We added 3" blocks to lower the rear of the car. I don't think I could add any more space with blocks because it would put the spring hardware lower than the wheel and if a tire went flat it would dig into the ground.

We added 1" extension to the front coil over set up so it would bring the front up and still keep the softer spring settings.

We clamped a leaf spring upside down to the back 1/2 of the spring to stiffen it up and pull the back down another inch.

With the extra distance gained in the rear suspension (because of the lowering blocks) we were able to add the longer and much stronger Rancho shocks. These are far stonger than the other shock i've used and really seem to slow everything way down in comparison with the other shocks I tried.

All of these things seemed to make the car hop far less. Problem is I only got 1 full power launch to test it before it broke. It seemed far improved so hopefully once I get the engine figured out I can get back to testing.

I do need to raise the shock mount on the back to help get a couple more inches of shock compression.

_________________
Ryan Covalt
62 Plymouth Valiant Race Car 2170# 11.22 @ 115.86 MPH 1/4 Mile Best
72' Dart Swinger Street Car, 4 spd, 3330# 14.061 @96.58 1/4 mile Best


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PostPosted: Sat May 11, 2019 2:14 am 
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Joined: Mon Oct 21, 2002 11:08 am
Posts: 13081
Location: Blacksburg, VA
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Congrats on the initial success, Ryan. This would (will!) be a feat of engineering when you get it solved, if it's not already. It looked much less bouncy to me when I saw the good run. Here's to the next set of super fast and not-so-hoppy runs. You will lose the excellent nickname, though... ;)

Cheers,
Lou

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PostPosted: Tue May 14, 2019 8:24 pm 
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EFI Slant 6
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Joined: Thu Jan 13, 2005 1:01 pm
Posts: 367
Location: waynesboro PA
Car Model*: 72' Dart Swinger / 62' Valiant
Thanks Lou,

As much as I liked the nickname last year and had fun with it...... I think i'd be glad to lose the name Hoppy this year. :lol: Looks like the changes were big steps in the right direction. Hopefully I can correct a few things with the shocks and make it better.

I pulled the intake and headers off tonight and found one pipe was nearly broke off at the flange and the intake gasket had split in 2 places over the exhaust ports. I cleaned the carbs out (didn't really find anything wrong there) but the linkage has far too much play. I ordered some new linkage to hopefully fix the weber setup and get that dialed in. I haven't been able to find any extremely obvious cause of the engine miss, but hopefully it was from a combination of the carburetor linkage moving and the exhaust/gasket issue. One of the low speed carb jets may have had the tiniest piece of dirt in it too. Hopefully these things fix the engine issue and I can get the car back to full power next race.

_________________
Ryan Covalt
62 Plymouth Valiant Race Car 2170# 11.22 @ 115.86 MPH 1/4 Mile Best
72' Dart Swinger Street Car, 4 spd, 3330# 14.061 @96.58 1/4 mile Best


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