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Recent content by ads22

  1. ads22

    Choosing gear ratios for a weekend racer/street car

    First does look a bit tall, it's about like 2nd on my VW, but I think a lot will depend on the low RPM tractability of the engine, and exactly how/where the car will be used. I didn't do the math for you, but ratio spacing looks reasonable by eyeball. You are generally looking for a decreasing...
  2. ads22

    REM Polishing transmission gears and final drive?

    My fwd transaxle is a VW manual shift (020) gearbox, so all power transmission, including final drive, is via conventional helical gears on parallel shafts. I'm convinced through reading that REM finishing does an excellent job in dramatically increasing fatigue life, and most probably...
  3. ads22

    Insulation of Car Exhaust

    Years ago a friend and I fitted an aluminum exhaust pipe to a Triumph Spitfire sports car. It was incredibly loud -inside the car - compared to the same system with a steel pipe. The only explanation we could come up with was that the much lower modulus of elasticity of the aluminum was...
  4. ads22

    REM Polishing transmission gears and final drive?

    TVP - Thanks! I've contacted REM for their tech info. An obvious fear re the REM data is that, given the large scatter of automotive dyno results, it is so easy to "cherry pick" an outstanding result. And no marketing department worth its salt would fail to do so, at least to some extent...
  5. ads22

    REM Polishing transmission gears and final drive?

    Has anyone seen objective data re driveline loss reduction via the so-called "REM" micropolishing of transmission or final drive gears? I've seen some claims that are kind of hard to believe, and wonder if anyone here has any actual data? I'm rebuilding a fwd transaxle for road racing and...
  6. ads22

    DC generator braking for engine dyno

    Sacem: I like the idea of mounting the reduction unit on the generator, that certainly eliminates the transmission loss variable. Depending on the inertia of the generator armature, how much you can gear it down and still absorb the power, and how happy your engine is at sustained high revs...
  7. ads22

    Different bore/stroke within same engine

    Well I guess I'm only half gullible, since I did type "supposedly" :) I did dimly remember the long and short ports, are they really as much different as the intake trumpet lengths in that photo? Some of the engine development was done here in Richmond, VA USA at the former Reynolds Product...
  8. ads22

    Different bore/stroke within same engine

    Long ago, road racing V8s with IR fuel injection often had long and short induction trumpets, which supposedly were for the purpose of broadening the power band. It pretty obviously would do that, at the expense of peak power. Whether it was optimum, I don't know, but they won a lot of races...
  9. ads22

    DC generator braking for engine dyno

    In my engineering school ME lab we had a dyno just as you described, a very old, very large DC generator (can't remember how many kW) mounted on bearings, connected to a big resistor bank electrically - and to a Toledo scale via a torque arm. My senior project involved testing a racing engine...
  10. ads22

    4-VALVE HEAD - OPTIMUM PORT VELOCITY??

    V114: If you're mostly looking for trends, either the regular or the plus version should do fine. The plus version is mostly convenience enhancements. If you're going to actually model your engine in detail, you might want to consider the pro version as mentioned by Ron Hamp. I think it's a...
  11. ads22

    4-VALVE HEAD - OPTIMUM PORT VELOCITY??

    V114: I'd like to toss in a suggestion. Why don't you get one of the available engine simulator software applications (available from www.performancetrends.com among others) and do a rough model of your engine. You can then play with a lot of variables and get a feel for how they interact. No...
  12. ads22

    Life of wide-band O2 sensor with leaded fuel

    Does anyone have knowledge as to the expected useful life of a Bosch wide-band O2 sensor used on a race engine running leaded fuel? I've heard everything from "a few minutes" to "several seasons of racing" and am thus totally confused. Assuming that there really is a huge range of life, I'm...
  13. ads22

    Ballpark Engine Lubricant Oil Flow Rate

    Oops, sorry, 2 gpm. Got me! Al
  14. ads22

    Ballpark Engine Lubricant Oil Flow Rate

    The applications engineer for Setrab Heat Exchangers gave a high side estimate of 2 gph, which surprisingly (to me anyway) gave a pressure drop of only 1.5 psi across a smallish (10 row) cooler, so it looks as if pressure drop is not a problem for me in this application. Thanks! (I'm still...
  15. ads22

    Ballpark Engine Lubricant Oil Flow Rate

    Can anyone give me a guesstimate of my lubricating oil flow rate to help me size an oil cooler and calculate plumbing system losses? Engine is a VW A1 (Rabbit, Scirocco) 1600cc 4 cylinder, 5 main brg, solid lifters, bearing clearances slightly bigger than std (~.002"), running SAE 30 or 50 oil...
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