The 72 Demon Follies....

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Demonx2

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Thought I'd start a thread to share some of the ups and downs as I've "restarted" my little drag racing hobby with my 72 Demon. I bought this car as a roller in the fall of 2019 "sight unseen" out of Texas. It had been a drag car all of its life but had weathered quite well sheltered from the ravages of our northern climates (I'm near Detroit). I got it with the intentions of dropping a motor in it and going racing.

Well...that didn't quite turn out to be what happened. After getting the car, I decided to tear out the front suspension, blast and paint the engine compartment and all the suspension parts, redo the fuel system with new lines/fuel cell, stripped EVERY wire out of the car and designed up my own harnesses/custom control panel then laid every wire in the car one at a time (and it all worked including the battery in the trunk)!), all new brake lines, all new cooling system w/ dual electric fans and a separate fan on the trans cooler, etc, etc. The car's 6-pack hood was red but I had it painted with the black pattern as shown in the pics. It came with a 489 case 4.56 8-3/4 rearend with a spool, a cage and subframe connectors, and a CalTrac split mono rear suspension. The Weld Pro Star wheels came with the car too but I bought new M/T skinnies for up front. It also had Rancho 9-way rear shocks and some 3-ways up front. It also had 5-pt harnesses I had to update. And I got a cool black and red steering wheel from a buddy for it. You get the picture...I didn't actually reuse all that much besides the body and the cheap racing bucket seats it came with. I put a lot of sweat equity in the car as I just enjoy getting my hands dirty and "putting a puzzle together" building a car. My cars are not the nicest nor the fastest but I enjoy them for the hobby and "release" they give me.


This car has a somewhat mild 408 in it. 10.5CR, 850 DP on a Super Victor, Bullet SFT cam with 251/255@050 & approx .560" lift, Eddie RPM heads with some bowl cleanup, and Hooker Super Comp headers. I bought an ATI 8" Treemaster converter that stalls right at 5000 rpm. I got the trans with the car - a CRT build with a Griner RMVB. The slicks came with the car - they are 10.5W's (28" tall) and need replaced but I'll do that when they don't hook. So far, they seem to hook pretty well.

My whole intention for this car was to be a "throwback" - something I would have built in the early 70's if I could have afforded it (but of course I could not!). I wanted the look from that era (60's-early 70's) as that's what I like! Note that I built the car to be street legal so it has turn signals, horn, and the wiper motor/linkage (but I never put the arms on it). Last year was its debut and we got it to the track 3 times. Best 60' in some good air was 1.51 and best 1/8 time was 7.11. More typical is 1.54 60' times and 7.15+ at around 94 mph in the 1/8th mile. I don't run it out the back door in the 1/4 as the 4.56 axle just spins the motor well past where it makes power and I don't want to risk it! I hope to put a 4.10 axle in it soon which will likely slow it down a bit but allow me to race in the Sportsman class with (hopefully) more footbrake cars. Oh, and I have done ZERO tuning on it yet to see if the times can be improved.

Well last year was such a hoot with it the first couple times out that my boss (that's the wife for you single guys!) said we MUST drive this on the street and have fun with it. So I did what any hubby would do - and bought a set of Pro-Star look-alike rims and ET Street drag radials and welded up a short 3" exhaust w/ turndowns ahead of the axle. I put the new wheels on it with the exhaust when we drive it on the street and undo that and put the slicks back on for the track. One thing missing is the weight of the car...I have not yet had it weighed so I don't know if it's 3000# or 3500#'s or ???

OK - so that levels up what it is and how it came to be what it is. So this past weekend, Milan Dragway had an "open" day where the new owner invited you to come and make passes with no entry fee(!) to help train his new employees. So we took the car there and made a couple passes. Milan was still working out bugs (which is why it was free) and had a major issue - no timeslips or times recorded for the first hour or so! But we got a 2nd pass and were just about to make a 3rd pass (I was near the front of the staging lanes) when a guy tapped me on the shoulder and asked if I knew I had a shock problem. I said nope and got out to look and oops! The LR shock was dangling not hooked to anything down low. So that ended the day for us but we had a good time.


The track photographer must have captured some photos and posted them up so I thought you might like to see the car doing what it was bred to do.

But first, on the street....
 
So on the street, here's a couple shots...
20220530_72Demon_Church_Pic.jpg


Visiting his cousins....
20220530_72Demon_at_Dealer.jpg


And at the track last year and this past weekend....
IMG_1807.jpg


20220614_Milan_Burnout.jpg


20220614_Milan_Launch1.jpg


And then the shock whoops!!
upload_2022-6-14_20-8-3.png


I'll hope to update this periodically...!!
 
Great looking car. Very cool launch as well. Those other two cars at the dealership must be envious.
 
Sweet. Cool car!
And I like your gear choice assuming the cam/ heads stay somewhere near what they currently are, otherwise could get away with 4.30’s
 
GREAT looking car! Are you running torsion bars? If so, loosen the drivers side one a little bit. The driver's side is coming up a little more than the passenger side when you launch. Feels great to be moving down the track again doesn't it!
 
Sweet. Cool car!
And I like your gear choice assuming the cam/ heads stay somewhere near what they currently are, otherwise could get away with 4.30’s
Thx Don. You're right on the gear. I've taken it out the back door a couple of times at 11.31@115+ but the rpm was between 6700-6800 and it really was not pulling hard. I figure the 4.10 will do a couple things - probably drop the flash stall from 5000 down to something lower (directionally correct if I get a sketchy track) as well as reduce the rpm down to a bit over 6000 at the stripe. "We shall see" as "your results may vary" as they say. If I'm wrong, well, maybe try a 4.30. Or just go race and have fun whatever it runs!!
 
Thx Don. You're right on the gear. I've taken it out the back door a couple of times at 11.31@115+ but the rpm was between 6700-6800 and it really was not pulling hard. I figure the 4.10 will do a couple things - probably drop the flash stall from 5000 down to something lower (directionally correct if I get a sketchy track) as well as reduce the rpm down to a bit over 6000 at the stripe. "We shall see" as "your results may vary" as they say. If I'm wrong, well, maybe try a 4.30. Or just go race and have fun whatever it runs!!

usually about 250-300 rpm difference between those different gears.
I doubt you will see much if any difference between any of these gears on a time slip. You are right, live to fight another day, no since wringing stuff out every pass.
I shift mine at 6300
 
GREAT looking car! Are you running torsion bars? If so, loosen the drivers side one a little bit. The driver's side is coming up a little more than the passenger side when you launch. Feels great to be moving down the track again doesn't it!
Thank you! Yes, torsion bars. I'll have to take a look and see how the ride height is set. To be honest, I've been spending all my time recently on my 71 Demon and this car has taken a back seat. Partly because it's just a fun little car the way it is...but I need to get my tail in gear and working on it to tune/tweak it to get it right!

And yes, after a 29 year hiatus to raise our kids, it does feel good to be watching the tree come down and standing on it!!
 
Must be great getting back on the track for sure, I haven't driven anything since 1991 same reason, kids. We have a very similar street/strip Demon racing in our NSS class over here, Its a 340/416, (3250lbs?) very mild motor, around 10:1?, stock J Heads, a mild hyd. cam .465/.493 lift, TR with 2 x 650 Holley's, 727 with just a 3500 stall, 3.91/28" tyre combo with SS springs old school style and is now running 11.23's-28's@117-118, with 60's in the 1.54>58's, shifts@5500 traps@5800-ish. You have a much better combo than that and will be in the 10's with a change to 4.10's I reckon, as said no need to flog the motor to much past where it makes power.
 
I can absolutely relate as I took a 24 year break for the same reason. It's great to be back in it!
 
Must be great getting back on the track for sure, I haven't driven anything since 1991 same reason, kids. We have a very similar street/strip Demon racing in our NSS class over here, Its a 340/416, (3250lbs?) very mild motor, around 10:1?, stock J Heads, a mild hyd. cam .465/.493 lift, TR with 2 x 650 Holley's, 727 with just a 3500 stall, 3.91/28" tyre combo with SS springs old school style and is now running 11.23's-28's@117-118, with 60's in the 1.54>58's, shifts@5500 traps@5800-ish. You have a much better combo than that and will be in the 10's with a change to 4.10's I reckon, as said no need to flog the motor to much past where it makes power.
Thx for sharing. That gives me hope that there is more in mine. I will have to prove it to make it real!!
 
It's great to see I'm not alone in life taking over the racing from many years ago. I've shown this pic before but this was me then. This one just sits in my garage for now where it's been since 1993 . Its racing days are over and will be more set up as a fun cruiser when I get time for it.
Charger_at_Milan_13413573614030.jpg
 
You might be surprised, it might really like the 4:10. Long time with it’s tongue hanging out in top gear. Nice car!
 
Pulled the RH rear shock. Pretty obvious why there was an issue with the left one. As suspected, the bushing was just crumbled!
20220616_213652.jpg


The fix? New Calverts, of course!!
20220616_214240.jpg
 
Time for an update. We took a vacation to see our kids at the end of June so the car sat until we got back. Now it was time to do the 4.10 axle thing.

I had bought a spool from a member here so I got another 489 case and a new set of 4.10 gears and had it set up by a local axle shop. When I pulled the axles, I was happy to confirm the car has the bigger 35-spline Moser axles. Those things are a lot bigger diameter than my memory is of stock axles! So in went the new 3rd member.

20220713_185607.jpg


20220714_185010.jpg


I also lashed the valves and worked to seal up a pesky LH valve cover leak. Even with those big cushy Moroso blue gaskets and the fabbed covers, the LH cover is determined to make a mess of things. This time, I THINK I found a pinhole in a weld and put some RTV on it. But just to be safe, I also put RTV around the whole lower edge of the cyl head/valve cover joint surface. Time will tell!

Now let's get to the track and try this new rearend out. Nope, Mother Nature refused to cooperate and gave us rain for 2 weekends straight and then every track in a 2 hour radius had some special event the next weekend! Bikes, donks, you name it...no place to race. So this past weekend, it looked like it may rain on Sunday so we decided to take the car to a TnT on Saturday. I need practice and need to try a few things so off we went. We got there almost 3 hours after they opened but were able to get 5 runs in, basically limited only by the time to let the car cool a bit between runs. DA was 3780 - it was 90 degrees.

Something to note...the TC stall speed was unaffected by the 4.10 axle ratio compared to the 4.56 that was removed. Flash stall remains right around 5000 rpm. Burnouts are better as the wheel speed is obviously faster with the 4.10. The car dead hooked every pass with the rear CalTracs doing their job. Maybe the new rear shocks helped too? Not really as this car has hooked well since i got it. The car has quite good rear lift/body separation you can see here.

IMG_7508.jpg


The front end gets light but no more daylight under the tire like with the 4.56. As for performance, well, no comment on the first 2 runs other than driver error. Runs 3-5 were spent playing with shift points. In this air, each run kept improving and the last run was an 11.52/113.5 mph. That compares to its previous best with the 4.56 of 11.31/115.3 on a day with a DA of roughly 1950 (67 degree day). If I would have made another pass, I believe it would have knocked out an 11.4x so all in all, pretty happy with how it performed.

The one thing that did not change was the 1/8th mile ET is quite quicker than the 1/4 mile ET. Meaning with its 7.25 1/8 mile time, the online 1/4 mile ET estimates would put it in the 11.30's. Not much different than last year's 7.11 1/8 mile went 11.31 but the online numbers would predict 11.1x's. More to come on that. Maybe the Super Victor intake is not ideal for an engine shifted at 6300? I have an Airgap for it if I feel inclined to make the swap one day.

Because we were late getting there, I still have not done any jetting in the 850DP. It has 83/82 jets...completely backwards from what it should have but I'm changing one thing at a time and this has not yet been done. I would think something like a 79/84 might be better but changes will have to wait for the next track day.

Pic below just for fun. The track has a guy that does the water box and pulls you in and he clearly loves his job. Points at you to see if you're ready, pulls you in and stops you at the water exit, big arm wavings to start the burnout, and a big hop and pointing down track for the finish. For him, every car has John Force driving and he makes for a good time! You can see him motioning below to hold/keep the burnout going. Wish everyone had the exuberance for their job like he does!!

IMG_7457.jpg
 
Yeah....meant to post the time slip. Finish line rpm now a bit under 6100, maybe 6080 (car has 28/10.5W-15 bias slicks on it).

20220808_113611.jpg
 
Time for an update. We took a vacation to see our kids at the end of June so the car sat until we got back. Now it was time to do the 4.10 axle thing.

I had bought a spool from a member here so I got another 489 case and a new set of 4.10 gears and had it set up by a local axle shop. When I pulled the axles, I was happy to confirm the car has the bigger 35-spline Moser axles. Those things are a lot bigger diameter than my memory is of stock axles! So in went the new 3rd member.

View attachment 1715968334

View attachment 1715968335

I also lashed the valves and worked to seal up a pesky LH valve cover leak. Even with those big cushy Moroso blue gaskets and the fabbed covers, the LH cover is determined to make a mess of things. This time, I THINK I found a pinhole in a weld and put some RTV on it. But just to be safe, I also put RTV around the whole lower edge of the cyl head/valve cover joint surface. Time will tell!

Now let's get to the track and try this new rearend out. Nope, Mother Nature refused to cooperate and gave us rain for 2 weekends straight and then every track in a 2 hour radius had some special event the next weekend! Bikes, donks, you name it...no place to race. So this past weekend, it looked like it may rain on Sunday so we decided to take the car to a TnT on Saturday. I need practice and need to try a few things so off we went. We got there almost 3 hours after they opened but were able to get 5 runs in, basically limited only by the time to let the car cool a bit between runs. DA was 3780 - it was 90 degrees.

Something to note...the TC stall speed was unaffected by the 4.10 axle ratio compared to the 4.56 that was removed. Flash stall remains right around 5000 rpm. Burnouts are better as the wheel speed is obviously faster with the 4.10. The car dead hooked every pass with the rear CalTracs doing their job. Maybe the new rear shocks helped too? Not really as this car has hooked well since i got it. The car has quite good rear lift/body separation you can see here.

View attachment 1715968356

The front end gets light but no more daylight under the tire like with the 4.56. As for performance, well, no comment on the first 2 runs other than driver error. Runs 3-5 were spent playing with shift points. In this air, each run kept improving and the last run was an 11.52/113.5 mph. That compares to its previous best with the 4.56 of 11.31/115.3 on a day with a DA of roughly 1950 (67 degree day). If I would have made another pass, I believe it would have knocked out an 11.4x so all in all, pretty happy with how it performed.

The one thing that did not change was the 1/8th mile ET is quite quicker than the 1/4 mile ET. Meaning with its 7.25 1/8 mile time, the online 1/4 mile ET estimates would put it in the 11.30's. Not much different than last year's 7.11 1/8 mile went 11.31 but the online numbers would predict 11.1x's. More to come on that. Maybe the Super Victor intake is not ideal for an engine shifted at 6300? I have an Airgap for it if I feel inclined to make the swap one day.

Because we were late getting there, I still have not done any jetting in the 850DP. It has 83/82 jets...completely backwards from what it should have but I'm changing one thing at a time and this has not yet been done. I would think something like a 79/84 might be better but changes will have to wait for the next track day.

Pic below just for fun. The track has a guy that does the water box and pulls you in and he clearly loves his job. Points at you to see if you're ready, pulls you in and stops you at the water exit, big arm wavings to start the burnout, and a big hop and pointing down track for the finish. For him, every car has John Force driving and he makes for a good time! You can see him motioning below to hold/keep the burnout going. Wish everyone had the exuberance for their job like he does!!

View attachment 1715968363
I am curious; is that Super Victor ported in any way or completely stock?
 
I am curious; is that Super Victor ported in any way or completely stock?
It is not ported. When it was installed, looked at the port alignment and it was dead on perfect on each port. No overlap/underlap. So did not have to touch it and left it alone.
 
Car is working extremely well for the MPH.
Nice job !
Thx Don. It hooks well and leaves but still seems like the 1/8th and 1/4 mile et's don't align. May be that you spend a lot more time in 3rd gear and if the jetting is off, it may show up more in the 1/4 et. So plenty more tuning to do. Fortunately, the chassis seems to work so I just need to work on the engine tune.
At the Nats this weekend, only planning to be there on Saturday and it has the heavier Summit ProStar look-alike wheels and the M/T Street ET drag radials. Will be interesting to see how those hook (or not!). I figure I'd try them at about 20 psi to start.

I won't be there on Sunday for the race so it'll all be just for fun on Saturday. Are you coming?
 
This will be fun to follow and you’re having fun!!
 
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