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So I spent a bit more time this weekend working on the Tunebug. I dove into my recurring noise issue (sort of a ticking, pffft-ing, heard under load). The car seems to be running fine otherwise -- though I don't have much of a frame of reference to know as I've never driven anything like the Tunebug before.
Here's what I've done over the last month or so:
* Tuneup (points, timing, carb sync). Car is running well as far as I know.
* Timing is set to 28*BTDC at high RPM (with all advance in), as checked with vacuum advance plugged and engine revved. This is conservative for this motor, but should rule out pinging.
* Drove the car with the vacuum advance plugged (both sides) to see if that was having a strange effect. No change at all.
* Wondered about the header hitting the car where it passes through the frame. Wrapped the edges of the frame with a bit of cut-off fuel line, figuring the rubber line would muffle the sound if that was the culprit. No change in the sound at all.
* Thought it was an exhaust/intake leak issue, had a LBC mechanic install new gaskets (Payen) and check everything. Made no difference.
I'm running out of things to check. I may call the mechanic back and get the car back to him. It wasn't running when I brought it down last time (I had pulled the carbs already) so I couldn't make the noise for him. A quick test ride with more experienced ears might help.
I've had a few others listen to the noise, and so far there have been no insights.
Here's what I've done over the last month or so:
* Tuneup (points, timing, carb sync). Car is running well as far as I know.
* Timing is set to 28*BTDC at high RPM (with all advance in), as checked with vacuum advance plugged and engine revved. This is conservative for this motor, but should rule out pinging.
* Drove the car with the vacuum advance plugged (both sides) to see if that was having a strange effect. No change at all.
* Wondered about the header hitting the car where it passes through the frame. Wrapped the edges of the frame with a bit of cut-off fuel line, figuring the rubber line would muffle the sound if that was the culprit. No change in the sound at all.
* Thought it was an exhaust/intake leak issue, had a LBC mechanic install new gaskets (Payen) and check everything. Made no difference.
I'm running out of things to check. I may call the mechanic back and get the car back to him. It wasn't running when I brought it down last time (I had pulled the carbs already) so I couldn't make the noise for him. A quick test ride with more experienced ears might help.
I've had a few others listen to the noise, and so far there have been no insights.