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  1. M

    circle track rear gear ratio info needed

    Mcodecuda’s suggestion is a good and the simplest place to start. A more complicated but more accurate solution for your car would be to find out what the top speed is for the class and track you plan on racing on. Then use an online gear calculator to determine what ratio will have your engine...
  2. M

    Good idea to have a baffled oil pan?

    The issue isn't whether your car runs in the 12s, 11s or 10s. The issue is how many G forces you generate. For most cars maximum Gs occurs during the launch. A hard launch with a clutch or a transbrake can easily produce more than 1 G of force even in a 12 sec car. If you combine that with...
  3. M

    Any smog experts out there?

    I'd try the simplest solution even tho it probably will cost you another inspection fee. Is there any chance taking it to a different inspection station would make a difference?
  4. M

    [FOR SALE] 1971 Plymouth Duster

    In Minnesota a few years ago I purchased a 1970s motorcycle on an auction with no title. MN DMV only required a prepaid insurance bond from a major insurance company for their book value of the motorcycle, and then they issued a brand new Minnesota title in my name. Minor hassle, not very much...
  5. M

    You're best guess please.

    With 9.2 compression and no blower I'd say the engine might get to 325 hp. With the somewhat modest 10 psi I'll say 525 hp. But you could easily push up the boost another 5 psi and get well into the 600s. Since this seems to be a well built engine with the right combination of parts, you...
  6. M

    Cabin Sound Deadening

    If I was a smart___s, I would tell you to swap the engine with an electric motor. But... I won't do that. From my own experience even the best sound insulated car will become loud inside with a loud exhaust. So the exhaust will be the best place to work to solve the problem. You need a...
  7. M

    Rocker Shafts

    I have ruined several sets of hard chromed rocker shafts by using needle bearing rocker arms even with a high volume oil pump and 70 PSI oil pressure. However I do use fairly strong valve springs with 500 lbs of open pressure. I switched to bushed rocker arms and have had no trouble since...
  8. M

    Duster Driveshaft length causing Vibration?

    According to the FAQ on Dennys Driveshaft website: How much slip travel should I have? https://www.dennysdriveshaft.com/frequently_asked_questions.html#faq_id10 You may have other issues as well, but you clearly have way too much travel on the slip yoke. You push it all the way into the...
  9. M

    Solar Panels, for CIVIL discussion

    I agree, if you want solar panels on your property go for it. I have considered it myself, if only to stop paying the ever increasing taxes and fees all levels of gov't are putting my my utility bill. Even my small suburban town has recently added a usage tax onto my bill in addition to sales...
  10. M

    Axel shaft hot

    Good question! That is such an obvious thing I never would have thought of suggesting to check the exhaust. As have most others here have already mentioned, I immediately expect it to be a bad bearing. My only thought about that, is it takes very little roughness in a bearing to produce heat...
  11. M

    Question does stall convertor rpm happen between shifts ?

    I have an 8 in converter that stalls at 5,200 in my drag car. I'll shift at 6,500 and by the math it should drop back to 3,800 from 1st to 2nd shift. But in reality it only drops back to 5,000 or so. 2nd to 3rd shift should drop back to about 4,400, but also only goes back to 5,000. It...
  12. M

    Any advantage to using U-Joint girdles vs straps?

    Price is more important than performance on all factory cars and they use straps. Performance is more important than price on all professionally built race cars and they use girdles.
  13. M

    Any advantage to using U-Joint girdles vs straps?

    As you have already mentioned, most folks would say they are stronger and the additional strength is good insurance in any application. I think girdles are easier to make sure the bolts are tightened evenly. Straps can be tightened slightly off center if you're not careful. They might make it...
  14. M

    Wheelies - Hypothetical Combo

    I'll point out that quickness of the car has little to do with it's ability to wheelie. We have a fellow at our track that pulls a two foot wheelie every launch in his mostly stock pontiac GTO and only runs in the high 12s. Whereas I can only get about 3 inches of air in my mid 9 sec Duster...
  15. M

    anyone build cabins?

    It looks like you are building not a guest cabin but an entirely separate living quarters. Is that how you would expect it to be used? Your guests won't have to come see you at all and they can simply live out there for possibly weeks. That would be more like a "mother-in-law" quarters...
  16. M

    What is this tool thread? Take a guess. Stump the Toolman!

    That is a tire chain installer and remover tool.
  17. M

    Mecum Thursday, Another Duster goes for big bucks

    It is on my bucket list to someday buy a quality car at one of these auctions. Can somebody verify how the fees work? Using this car as example, the buyer pays $73,700 for the car and another 12% buyer's fee for a total walkaway price to the buyer of $82,500. (and gov't sales tax, title fees...
  18. M

    "Mopar 10 commandments"

    Thou shalt not install Chevrolet style rear facing / cowl opening hood scoops on a Duster.
  19. M

    This guy must have thought he was so clever!

    Or maybe some wise guy just set up the photo and posted it as a joke, to get some attention and mouse clicks at his website.
  20. M

    Backfire on deceleration?

    Very nice explanation. On some older big single cylinder motorcycles we would often get a loud exhaust pop if you closed the throttle suddenly upon deceleration. The solution was always to richen up the carb. I like your explanation on what was really going on, thx.
  21. M

    Max HP debate

    I'd recommend a short fill of hard bloc for a race engine, even tho you already said no to that. Cooling would not be a problem for the short duration of run time at a dragstrip. A street engine is rarely run at full power and also would not have a cooling problem, assuming you have an...
  22. M

    Ive become Mr Smith

    Thank you and best wishes to you!
  23. M

    Ive become Mr Smith

    I was adopted as an infant and raised by good folks. They provided everything I needed and taught me a work ethic in their business. But nothing about real life, or living. What I needed was a mentor. Someone that cared but was also not responsible for my upbringing. If you can become a...
  24. M

    No bloody A.B.C or D

    Oh Ho... Mirror Mirror... I think the cast enjoyed the different uniforms in that episode, I especialy liked Uhura in this one. Nice touch to put that on the model, you must have a dark side to your personality! I can't remember if the Enterprise was shown with that logo in the original...
  25. M

    440 cam selection question

    Have a look at the Mopar purple shafts on the Mancini website. Mopar Performance ''Purple Shaft'' Camshaft Kit I agree with everything RustyRatRod already said. With that 2X4 intake manifold and heads combination indicates this is clearly a throwback street showcar. More show than go as...
  26. M

    Guess the HP

    My mistake, I thought it was an 850 CFM carb. Well then I'll adjust my total HP guess up to 630 at 6,100 rpm, with the torque still 610 at 4,400 rpm. Now I think your limiting factor will be the cam duration. You will prably be able to spin it up to 7,000 if you wanted but you will need a...
  27. M

    Guess the HP

    610 TQ at 4,400 rpm 570 HP at 5,600 rpm I think your HP curve peak will be limited by that small carb. But it will also make the car much more drivable at lower rpm, if this is for a street car.
  28. M

    Freeing up a frozen block ??

    I learned a lot as a kid from just taking thing apart. The harder it was the more fun it was. I think it is still fun to take things apart, unfortunately the wife expects me to put them back together again, nuts. jos51700 is exactly right, this is really good practice for when you might...
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