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I have an 86 Spider which was converted to Dellorto's. All of the FI components have been removed and the engine is now a bare 2L. I replaced and rings, (jugs were good) resurfaced the valves and installed new Euro cams. The valves are set at .018 and .021, the valve timing is right on at 102 and the distributor is set at the mark on TDC (P). Everything seems right but when I try to start it it will only pop and backfire through the exhaust. It is getting good fire and fuel and I checked the seating of the valves by running some air into the cylinders with a differential pressure tester (good). There is a lot of blowby into the block but I am guessing that is because the rings have not been seated yet. I am now to the carbs but am not sure they would cause this problem.
Does anyone have any ideas, I'm all out.
Thanks,
Dave
Does anyone have any ideas, I'm all out.
Thanks,
Dave