Quote:
Originally Posted by thecheese429
I was wondering if anyone had done tests on this, then decided to do my own. I have a 4 banger, so changing gaps across the board is not time intensive at all.
I changed the gaps, and then checked the vacuum. Then I changed the gaps, and checked the vacuum again. Here's the data:
Code:
Gap (inches) Vacuum reading (In. Hg)
Test 1: .025 16
Test 2: .040 16.5
Test 3: .045 16.7
Test 4: .050 16.7
Test 5: .060 16.9
Test 6: .080 16.7
No, my gauge doesn't have decimals, but the needle moved so little between tests that I figured I should use decimals.
My question is how this relates to FE. Does higher vacuum mean higher efficiency? |
Interesting results!
I quess you measured the vacuum at idle?
Did you notice any difference in RPM?
I'm just quessing, but maybe different gaps causes different ignition advance and that causes different rpm and also different vacuum
