After a year and a half of hanging around in the shadows here, I finally took delivery of a new VS Speedster this week.
The car looks fantastic, but driving it has been less than fun so far. It's about what I expected for a new build after reading 18 months of stories here. I'm really glad I did my homework first, or this would have been pretty discouraging.
The stock VS 1915 (with external oil cooler and fan) starts right up, idles steady, and accelerates smoothly when cold, but everything starts falling apart as it warms up. Lots of popping and coughing, rough running at low revs, and it sometimes stalls when I get off the throttle after runs of even a few minutes at 50-70 mph. On the freeway this morning, top speed was 70 mph with my foot to the floor, so I got off at the next exit and limped home. Usually, a blip of the throttle will return a normal, steady idle.
The fuel lines between the two carbs are lying on top of the tranny, so, as an experiment, I've wrapped them in rubber pipe insulation and will try the same run tomorrow to see if there's any difference. If so, I'll reroute them higher up.
As usual, Kirk is having me take the car to a local air-cooled VW guy for sorting. On the phone with the local guy, I mentioned Empi HPMX's and he groaned. "It runs OK when cold," I said. And he said, "They all do."
He thought everything needed a reworking (jetting, timing, etc.) and doubted the problem was vapor lock. But I'm wondering, if not vapor lock, how can the engine run pretty well when cold and fall apart when hot? FWIW, the temp gauge on the dash never got above mid-way while driving. It stays way at the left end of the scale no matter how long the engine idles after a cold start (over 15 minutes) and only moves into the normal range if the car is driven.
Pix and progress reports to follow.