I recently rebuilt a motor for a friend's 1600 restoration. It's kind of a hot motor, with mahle 9.5/1 pistons, a schrick 284 cam, weber 40mm sidedrafts, and an IE reproduction 008 distributor with pertronics ignitor. I've got the timing set at ~4 degrees BTDC @ ~ 900rpm, up to `24 degrees BTDC @ 2500 rpm.
The thing doesn't run great, and I can't seem to get any adjustment of the #3 idle screw. It idles rough, doesn't have the power it should, and it backfires (popping from the tail pipe) on deceleration (engine braking).
I did not rebuild the carbs, the owner of the car did (yes, i know .
Here's my questions for all you FAQ gurus:
Do the schricks require a different valve clearance than the stock cams?
AND...
Why does the car run like muff cabbage cold ( and i mean really poorly )?
AND...
Why does it pop from the exhaust on deceleration (engine braking)?
Should I be looking mostly at the carbs, or could the valve adjustment be affecting things?
Thanks,
Chris