padam
Well-Known Member
I'm getting involved in drag racing again after about 20 years on the sidelines.
My car is a 73 Charger that was originally a 318 auto car I bought in 1981. In the 80's I modified it quite a bit:
413 with 906 heads, MP 484 lift cam.
Holley 750 vac sec, Torker intake, Holley blue pump.
MP orange box and distributer. Timing is about 38 total, no vacuum advance.
4-speed, 8-3/4 sure grip 4.30 ratio.
This combo worked pretty good before,
Used to run 12.50 at ,105 mph.
8:20 1/8. With slicks and open headers.
I took it out a couple times this year, running through the mufflers and on dot Hoosier tires.
It ran pretty crappy, sounded just as bad.
So I'm trying to fix a misfire condition at wide open throttle / high speed.
So far I have replaced plugs, wires, cap, and rotor.
Compression test was decent most 160psi, lowest 150 hi 170.
I finally installed a fuel pressure gauge I've had on the shelf for 20 years, and the pressure is good at 6 psi until I floor it then drops to under 3.
I disconnected the fuel line to change the Mallory filter, and the fuel just trickled out of the line.
I have fuel cell and some bits of the foam were in the filter.
It also looks like the foam was jamming up the outlet. See pic.
I pulled the foam out and it didn't look horrible, but obviously starting to degrade.
So I'd say 25 years is pushing the limits on fuel cell safety foam.
My car is a 73 Charger that was originally a 318 auto car I bought in 1981. In the 80's I modified it quite a bit:
413 with 906 heads, MP 484 lift cam.
Holley 750 vac sec, Torker intake, Holley blue pump.
MP orange box and distributer. Timing is about 38 total, no vacuum advance.
4-speed, 8-3/4 sure grip 4.30 ratio.
This combo worked pretty good before,
Used to run 12.50 at ,105 mph.
8:20 1/8. With slicks and open headers.
I took it out a couple times this year, running through the mufflers and on dot Hoosier tires.
It ran pretty crappy, sounded just as bad.
So I'm trying to fix a misfire condition at wide open throttle / high speed.
So far I have replaced plugs, wires, cap, and rotor.
Compression test was decent most 160psi, lowest 150 hi 170.
I finally installed a fuel pressure gauge I've had on the shelf for 20 years, and the pressure is good at 6 psi until I floor it then drops to under 3.
I disconnected the fuel line to change the Mallory filter, and the fuel just trickled out of the line.
I have fuel cell and some bits of the foam were in the filter.
It also looks like the foam was jamming up the outlet. See pic.
I pulled the foam out and it didn't look horrible, but obviously starting to degrade.
So I'd say 25 years is pushing the limits on fuel cell safety foam.