Search results

  1. P

    Low vacuum - should I ditch my vacuum advance distributor?

    It's easy to modify the distributor for slightly more advance. There's lots of threads here which describe how the advance works and how to modify it. Going from 28 to 34 degrees will be quite the change in performance too. The intake swap could add a couple inches of vacuum, which might be...
  2. P

    Low vacuum - should I ditch my vacuum advance distributor?

    Vacuum advance has a lot more effect than just economy. Throttle response, part throttle cruise, gear changes, idle quality and the way a stick car behaves at low rpm are all affected by vacuum (load based) advance. I use my efi to control the timing on my dart, and it's an entirely different...
  3. P

    Low vacuum - should I ditch my vacuum advance distributor?

    Depends on which system. The 6al-2 programmable would allow for a custom map including vaccum advance. I wouldn't suggest it for a street car though, since MSD durability is a forever looming question mark.
  4. P

    Low vacuum - should I ditch my vacuum advance distributor?

    I've been doing a ton of looking into the same thing for another engine of mine. The low vac cans are now unobtanium. The choice is either some sort of programmable unit (msd or progression ignition seem to be it - $535-550) or dealing with a poor tuneup. If the car is meant for track only...
  5. P

    340 Chugging instead of Reving

    I think you're onto something with the reluctor. I'm not familiar with that distributor, but is it possible the pickup wiring is backwards? I seem to remember if it's flipped, you'll get more "advanced" spark when looking at the rotor and reluctor relationships to the cap and pickup. The spark...
  6. P

    No oil pressure at idle

    I run a HV pump with a stock oil pan on my 360/408. Never have I had an oil pressure problem. 70psi cold idle, 40psi hot idle. Bearing clearances are in the .0028-.0031 range and timed oil to the heads (not a fully grooved cam core). HV will provide more PSI at a lower RPM than a standard...
  7. P

    engine trouble, oil pressure diving

    Mechanical or electric gauge? Auto or manual trans? First, I'd check oil level, then filter. Next, I'd pull the valve covers and check the rockers for preload/lash and look for signs of abnormal wear. Then I'd probably pull the intake to check the lifters. The only things that cause...
  8. P

    FABO looks different this evening.

    I never would have guessed a group of old guys still driving old cars would hate change so much! :rofl: It's different, but I don't think it's worse. Except on mobile my thumb isn't long enough to reach the "new posts" button..
  9. P

    CLUTCH HELP

    That sounds about right. Nothing is flexing? Any chance you could take some pictures of your clutch lever at rest and then when the pedal is fully pressed?
  10. P

    CLUTCH HELP

    At rest, how much space between the throwout bearing and the fingers on the diaphragm? I run a diaphragm clutch in my 833, and it has a VERY narrow adjustment window. At rest, I have maybe .030-060" gap, otherwise it won't fully release with the pedal on the floor. Also a good idea to have...
  11. P

    Anyone got a match ???

    My particular experience was with a mid 80's dodge, but it used the same 'family' of alternators as our cars. The alternator I was using was capable of well over 40 amps (180, I think?) and it definitely hit around 40v. I replicated the issue in my driveway later (I was broke and couldn't afford...
  12. P

    Anyone got a match ???

    I had an alternator before that would peg when revved. Was a bad alt with an internal short. At first it would go the other way, but then I reversed the field and it would peg. Sadly, the first time it pegged I hit my flashers and headed for the shoulder. Guess what 40+ volts does to...
  13. P

    Ignition Control to Distributor

    Both. The reluctor wheel induces a current into the pickup coil. The two wires come from the pickup. There isn't a dedicated role for each wire, neither is a positive or ground, both wires are needed in order to "read" the signal.
  14. P

    Definition of insanity

    Gonna be seeing a lot more of the door from the driver's seat than the rest of the car. A buddy in college lost some hubcaps. Couldn't find a matching pair. Couldn't afford all 4. So he ran 2 of each on either side. "no one sees both sides at the same time" became a common refrain from then on.
  15. P

    340 Engine Shake

    Two things: 1) 340s are rare and come at a price premium. So it will always be worth more with a 340. 2) People with only a passing knowledge of Mopars will always think a 340 is better, or more special than a 360 in some mythical way that can't be replicated by anything but a 340. I'm with...
  16. P

    340 Chugging instead of Reving

    ^agreed with above. Check the easy things one at a time then get into the heavier lifting.
  17. P

    340 Chugging instead of Reving

    I once had a ohc engine thst I screwed up the cam alignment on, advanced something like 14deg (about 1 timing tooth) and it would rev to about 2800 and then pop, fart, spit and buck. Completely different engine, but similar behavior, so I wouldn't ignore the cam timing... Just my take.
  18. P

    74 power wagon dream truck...

    fuel distribution and tolerances can explain cylinder-to-cylinder variance as well. Not all detonation is audible either - knock sensors will pick it up LONG before it becomes audible. I learned it the hard way with a turbo 2.2 many years ago. My top ring came out like dust, I then later cracked...
  19. P

    Possibly the DUMBEST street sign ever!!!

    That's not exactly what happened. The real story is that for years McDonalds customers had been injured by their too-hot coffee. Coffee that they served at 180-190 degrees F. Why so hot? Because it takes longer for someone to drink, meaning fewer free refills. Mrs. Liebeck was the passenger in...
  20. P

    stripping a patina Duster hood

    Neutralizing acid makes water and salt. Salts aren't ever good for corrosion protection or paint adhesion. The pros seem to recommend rinsing the ospho before it dries, or re-wetting the surface with ospho and while it's still wet, clean thoroughly with soap and more water. The water...
  21. P

    How does cid make power?

    LOL, to an extent. Two horses will get there quicker, and pull more, but typically not faster ;) But this is what the "horsepower" figure is derived from: work. Speed is just the result of work being done to mass.
  22. P

    How does cid make power?

    Torque is not accurately measure unless one stops the engines acceleration. The rate is used to simulate a car accelerating, and the torque is backed out of the force required to hold that rate. But the actual torque spit out and graphed is not what is measured.. It can't be, otherwise the...
  23. P

    408 hyd roller, too much spring pressure?

    That graph basically only shows a difference in spring rate, because conical are non linear. The resonance is still the same, and the loads will be more difficult to hit. In a perfect work, a conical or beehive would have a wire diameter that varies with the od of the coil, that's the only way...
  24. P

    How does cid make power?

    I'd argue suspension is what gets the 60. Traction and initial acceleration is what cuts it short. Just as an illustration, lots of fast cars leave on the converter well past peak torque. This is because they want to be deep in the revs to get max work as early as possible. Clutch cars will...
  25. P

    408 hyd roller, too much spring pressure?

    Doesn't work that way. Less mass will literally lower thr loads or the amount of compression (lift). Ive designed hundreds of springs in the past couple decades, and unless you go to some super exotic material this is exactly how it works. Ovate wire can allow beehive geometry through without a...
  26. P

    How does cid make power?

    I'll also say that it still 'depends'. I agree that 'low rpm hp' engine is exactly what you get with a 'torque' motor. The reason 'it depends' is because dynos can run at various rpm rates, and that rate can have a significant effect on the outcome. A slow ramp rate will let a lazy build look...
  27. P

    How does cid make power?

    But also, torque is meaningless. It's a force. It's measured instantaneously. It doesn't have anything to do with how well the engine can accelerate - that's why the HP measure exists. Without it, we cannot relate to what happens 'per unit time', meaning we can't figure out how the engine will...
  28. P

    How does cid make power?

    This is a better question, and comparing 318 vs 360 and 360 vs 408 is the right approach because the engines are all limited by what can be put on top, either by budget or availability. It's not like we can go out and buy aluminum W2 heads ready to bolt on. The only good offset heads out there...
  29. P

    408 hyd roller, too much spring pressure?

    BH's DO require lighter components. The synergy is that their shape has an intrinsic weight loss from a smaller retainer. The requirement stems from the fact that you're losing spring mass. Less mass means less energy the spring can absorb - there's no free lunch.
Top