Direct C51
Well-Known Member
It appears my previous thread on the topic went from how to modify an intake for better mixture distribution to a debate about EFI and batteries.
So, here is what I did and the results. Below you will see the original (standard) intake design and how I modified it. The intake "plenum" before the split to each head went from about 3 cubic inches to a little over 30 cubic inches. My EGT spread went from 150 - 200 degrees in cruise to about 50 degrees. With a little carb heat applied, my cruise EGT spread is less than 15 degrees. With the old design, my #2 cylinder would run so rich that it would start to misfire at certain power settings, now my #2 EGT is right in the middle of the other 5. This was an absolute success, especially after 6 months of doing everything I could to try to fix it, including all of the suggestions by the Corvair experts.
So, here is what I did and the results. Below you will see the original (standard) intake design and how I modified it. The intake "plenum" before the split to each head went from about 3 cubic inches to a little over 30 cubic inches. My EGT spread went from 150 - 200 degrees in cruise to about 50 degrees. With a little carb heat applied, my cruise EGT spread is less than 15 degrees. With the old design, my #2 cylinder would run so rich that it would start to misfire at certain power settings, now my #2 EGT is right in the middle of the other 5. This was an absolute success, especially after 6 months of doing everything I could to try to fix it, including all of the suggestions by the Corvair experts.
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