Chris Taunton
True Classic
Some of you know Gus (asparaGus) as Split Pea. I picked him up from George in Portland last November and have been fixing small things while using him as my daily driver. I understand that a previous owner and Xweb member built the warm 1300 engine with a PBS cam (of some sort), custom made 4 into 1 headers, Bosch electronic ignition from a '79 X1/9 ,and a 32 DMTRA carburetor.
I have been chasing a horrible flat spot the whole time. It revs to about 4300 rpm and hits a wall, almost like a rev-limiter. If I release the throttle, the engine picks up speed a little. Best power comes at about 90% throttle. I have replaced the distributor with a Marelli SE100 from MWB (the centrifugal advance was stuck in the Bosch distributor, and the installation of the Marelli is cleaner) and experimented with ignition timing and carburetor jetting. The engine runs much better than when I picked up the car in the low and mid rpm ranges, but will not rev.
Has anyone else experienced this problem? What was the eventual solution?
I have been chasing a horrible flat spot the whole time. It revs to about 4300 rpm and hits a wall, almost like a rev-limiter. If I release the throttle, the engine picks up speed a little. Best power comes at about 90% throttle. I have replaced the distributor with a Marelli SE100 from MWB (the centrifugal advance was stuck in the Bosch distributor, and the installation of the Marelli is cleaner) and experimented with ignition timing and carburetor jetting. The engine runs much better than when I picked up the car in the low and mid rpm ranges, but will not rev.
Has anyone else experienced this problem? What was the eventual solution?
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