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volkswagner

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About volkswagner

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    SAM!!!!!!!

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    WA
  1. volkswagner

    "Swamp thing" JBC enduro car!

    Link to our weekends worth of fly by's. Unfortunately there really isn't any other view for spectators. https://www.youtube.com/watch?v=YpOASzj1iVs&feature=youtu.be Luckily, we were able to find ourselves being trailed by another team for a lap of their in car footage! Starts at around 19:00: https://www.youtube.com/watch?v=Wgax4wyZyR0 FYI the footage is from the group B winners of the Saturday event!
  2. volkswagner

    "Swamp thing" JBC enduro car!

    Installed a Freddy. Shortened driveline installed. Jeff had a great starter chunk for the down pipe. It didn't get us to the ideal location under the car but cleared the steering intermediate shaft nicely :-) Large items left, fuel lines/surge tank and oil lines, throttle cable, and wiring... 2 weeks.
  3. volkswagner

    "Swamp thing" JBC enduro car!

    Offerings to the racecar gods!
  4. volkswagner

    "Swamp thing" JBC enduro car!

    Grooves on the crank bearing surface of the failed cylinder. Makes the case that the bearing failed before the rod bolts let go. Although I’m sure the rod bolts stretching before failure and opening up clearances could have resulted in a bearing spin.
  5. volkswagner

    "Swamp thing" JBC enduro car!

    Kaboom! More details to follow...
  6. volkswagner

    "Swamp thing" JBC enduro car!

    Same supply, tried new plugs, grounds would be good to check.
  7. volkswagner

    "Swamp thing" JBC enduro car!

    Thought that, we switched the whole ignition over too a matchbox distributor though with no improvement.
  8. volkswagner

    "Swamp thing" JBC enduro car!

    As Carter said, our day at autoX was anything but successful. We worked all day and probably left with more questions than answers. However, that was exactly what the autoX was intended to be, a shake down. Turns out we needed it! We had so many little small issues adding up that we spent the whole day troubleshooting ourselves in circles. We were able to determine that one of our float bowl check valves was sticking closed, resulting in a dry bowl. Issue #1: check Once we solved the check valve issue we found that after a full throttle lap we die with dry bowls on both carbs... We left autoX suspecting a fuel supply issue. After checking flow through the fuel supply components and working our way back, we eventually found the root cause. Our fuel supply port from the tank was absolutely filled with dirt from the field whence it came. It's really quite amazing it ran at all! Now unclogged and running free. With the full fuel available, we were disappointing to find that on our test drives, the car felt... lacking. It took off great down low then fell flat on it's face. No go. There HAD to be another major issue. Lots of troubleshooting, lots of testing, lots of head scratching and then we finally found the embarissingly simple issue. Our throttle linkage was only giving us a wink out of the carb butterflies! The image above was our FULL throttle. A few tweaks to the linkage and viola, the power we expected was there. Just in time! We leave tomorrow. We have one last running issue with the motor that we haven't solved. Looking for suggestions. We have a persistent firing miss throughout the rev range. Rev's fine but a constant throttle input makes the misses obvious. We have changed the entire ignition system from the coil packs to a matchbox dizzy without improvement. So ignition is thoroughly ruled out. Any other ideas from the crowd?
  9. volkswagner

    "Swamp thing" JBC enduro car!

    The tow guy seemed to like it when he hooked up to pull me off the track when the fuel ran dry!
  10. volkswagner

    "Swamp thing" JBC enduro car!

    Almost enough... :-)
  11. volkswagner

    Freebird

    Valves ground, now back to the shims, uhg. Even getting the baseline measurements represented several installs and removal of the cams. The complication being that the valve pairs in each cylinder share a crab rocker arm. This means that measureing the clearance is affected by the neighboring valve. Had to install with half the shims installed, measure, uninstall, swap shims and repeat. The kid needed some practice writing numbers. He became my clearance recording technician for the evening, Took the baseline measurements and calculated the needed material to be removed from the shim pads to gain desired clearances at each location. Lucky that work has a surface grinder. Reinstalled, measured again, found a few outliers, uninstalled and re ground the stragglers. Built up now with 0.014" exhaust clearances and 0.10" intake clearances +- 0.0005: or so. Phew, glad to be dine with that... Probably had the cams in and out 10 times total.
  12. volkswagner

    Freebird

    In they go, new rings worked out and crank/piston went in. All seemed good. ARP studs that I got when I picked up the DET block. Then I started back on the head... This wound up taking MUCH more time than anticipated. The problem, these heads have shimmed valve clearances, no adjusting screw. This means that in order to get the appropriate clearances, the shims would need to be ground to thickness. I was originally not going to grind the valves because of this exact reason. Then I measured my clearances as it was. Way out of tolerance, not even consistent. This made obvious that I WOULD be grinding shims either way. So might as well make the most of it and grind valve seats first. Removed the valves and this is what it looks like, makes me glad I actually ended up doing this, the seats were so much worse than I thought. New favorite way top grind, rubber bump stop chucked in the drill, worked very well. Mucho Betteritto. Already here, better take some data for the future. 45CC in the bowl, 5CC in the cylinder. Calculates out to 10:1 compression as advertised. Nice to know how much of the compressed volume is in the head for future piston choices though.
  13. volkswagner

    "Swamp thing" JBC enduro car!

    A little late with this one but oh well its a cool shot. Jeff deep into his oil pan build. The seat cradle pre-fabbed and mounted to the seat. Large side capture plates to allow us to test fit and find the optimum heigth by jacking the seat up and down with driver in situ. Find the sweet spot and weld in place. Remaining floor filled with steel sheet. Lots of test fitting, head scratching, re-test fitting, tacking, un-tacking, more head scratching, ordering more parts, and test fitting. Finally have the harness attachment [point figured. still some more fab to complete but, straight forward from here. On to something more straight forward. Battery and fire suppression mounting. And some mandatory tow straps. Rear crossmember hard mounts arrived so Carter was able to get the rear end into place and get started on fitting the exhaust. Jeff worked on the thankless job of wirirng. All that work and not even any fun pictures to show it! Starting to look like something. Less than 2 weeks until autoX shake down, 3 weeks to race day...
  14. volkswagner

    "Swamp thing" JBC enduro car!

    We could figure out a more elegant solution if we had the time. Shimming the motor is the fastest means to the end.
  15. volkswagner

    "Swamp thing" JBC enduro car!

    Sure did! thanks again for bending it. We ended up fitting it differently than originally planned. We were going to have it rotated forward toward the top of the window frame but, we realized if we moved it back a tad we could have it fit about an inch higher by recessing it up to the roof skin. This translated to more head clearance and therefore being able to mount our seat higher.
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