Both engines run (ran) quite well on unleaded regular without ethanol. The 216 is an original with no service other than tuneups at 45,xxx miles. i first encountered this issue with the (stock) '54 235 iin my '52 two-door in the late 1980s, buying discounted gas from a CITGO station that proved to be an ethanol mix. In the 1990s in Illinois, whenever we (inadvertently) filled the 216 with an ethanol mix, it would strangle and behave as if it were vaporlocking from a cold start. After i realized what was causing the problem, we have studiously avoided ethanol.
Someone mentioned in another discussion that the jet size would need to be increased by 27 percent to use ethanol successfully. Is this a matter of "trial and error" for each specific case? Can specific larger jets for the Rochester be purchased over the counter, or must they be drilled? What happens to performance and economy with larger jets when ethanol is not available?
God's Peace to you.
d
Inliner #1450
