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mender

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mender last won the day on February 8

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  1. mender

    Reground Camshafts

    Them literary references trip up a lot of folks.
  2. mender

    Reground Camshafts

    The more you look, sometimes the more you find that is wrong. I have found rare engine parts for people on this forum that they've looked for with no success for up to a year; took me less than five minutes but I'm used to doing searches like that. That's why I said I could get 95% of the specs in a day (OEM replacement cam specs in a catalog) or in a week (more thorough search of specific applications and sources, i.e. "BMW E30 series Restoration Bible", W72 Trans Am 6.6 engine specs and part numbers, etc.)
  3. mender

    Reground Camshafts

    http://mywikimotors.com/m20b25/ M20B25 camshaft specs : duration – 256 deg, valve lift – 10.1 mm. First place I looked but I can look further if you like. I have ninja google skills for engine stuff. More here: http://bimmersport.co.nz/topic/22422-m20-camshafts/ And: 256 degree cam advertised for sale: New factory-spec camshaft for the 325i M20 engine. BMW cross-reference #11 31 1 716 138 Fits the following M20-equipped cars: -E30 325i -E28 528i -E34 525i *Note: Does not fit the m20 cylinder head found in 325e ('eta', M20b27 w/#200 head).
  4. mender

    Teach me about leak down tests

    I read that as a burnt exhaust valve, rings usually show up as a group issue. Could be though.
  5. mender

    Reground Camshafts

    Hmmm, something else we have in common; my dad raced flatheads in the '50s and had his tricks for more rpm ...
  6. mender

    Reground Camshafts

    We won't get into lofting lobe profiles...
  7. mender

    Statistically Speaking, Fuel Capacity

    "McCarthy said the engine’s fuel economy was so good compared with his previous V-8 engines that he was able to skip two planned fuel stops during the Baja event, which helped him win the class." Apparently it is, and not just in Champcar. Lots of big name races have been lost in the last mile when someone ran out of fuel.
  8. mender

    Teach me about leak down tests

    Interesting that they didn't give us the results from the dyno test before the torture testing, only that it was just shy of the advertised numbers after. Mainly proof that modern engines wear better than they used to due to much cleaner burning and subsequently less carbon in the oil. 13% is a little high, within the range that I would be taking the heads off for a look. Most likely a valve sealing issue.
  9. mender

    Reground Camshafts

    It's tech's responsibility to have the specs on-hand if they are needed to enforce the rules. If they can't, just assume that everyone is guilty and raise VPi by 50 points across the board. We talked about stuff like this years ago.
  10. mender

    Reground Camshafts

    Easiest would be to check for stock lift at the valve. Getting the stock specs isn't as hard as some here think, I could probably get 95% of the pertinent cam specs in a day and the rest in a week.
  11. mender

    Anyone have Aero questions?

    At the top of the reply box you'll see a bold capital A with a line under it. That's where the colour options are. Highlight the text you want to change and select the appropriate colour (green for sarcasm, red for irony, I usually use blue for "edits") and click - done! And my wife is a teacher so I get to help mark papers. I apologize for editing your post for punctuation and such but I can't help it! I suspected that's what you were getting at, and it sounds like you're referring to an exhaust blown diffuser with your warm air and downforce example. I'll let the expert sort this one out for you.
  12. mender

    Anyone have Aero questions?

    I run the ducting for the rad exit air up and through my hood, it made a noticable difference in the high speed (120+ mph) stability of the car from the reduction of front end lift.
  13. mender

    Anyone have Aero questions?

    You forgot the green font ... If not, let's hear why you think otherwise.
  14. mender

    Statistically Speaking, Fuel Capacity

    For 500 point cars, it seems that it's all about the free parts - which makes sense because that's all they can use unless they want to get laps (which is a choice that I think is worth considering). For the low VPi cars, it's about the combination of what we can get for our points, and leaving out one of the parts of the endurance racing equation puts a limit on how equal we can make our cars with points. At some point, more points via a lower VPI doesn't make up for the free parts and/or fuel capacity difference. For low VPi it's about the selection; for high VPi cars it's about the free parts.
  15. mender

    Statistically Speaking, Fuel Capacity

    If fuel was on the table for points, teams like Good, Bad and Ugly would have to choose between going fast and going long. And unlike all the freebies for the 500 points cars, the fuel capacity thing has never been about free fuel but instead fuel for points. Not free; something has to be given up to get fuel. A fundamental difference in perception there. P.S. When did it become necessary to make sure an SC300 was the fastest car?
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