Recent content by MinnesotaMopar

  1. M

    Is it ok to copy a W5 head and make it better or are we just mad at Speedmaster

    It is my laymans understanding of copyright and patent law is that you cannot make an exact duplicate of something and sell it, or even give it away for free. You can produce a similar product with some differences and sell it. Just because it performs the same function and is interchangeable...
  2. M

    speedmaster stuff pulled from Summit racing shelves

    And yet even with all the objections to China stealing our product designs, I find it disappointing that so many people here are happy to photocopy wiring diagrams, service manuals and all sorts of copyrighted written documents and publish them online for free.
  3. 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...
  4. 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...
  5. 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?
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. 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...
  13. 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...
  14. 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.
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