MPG went down the crapper
Postmaster
Joined: Mar 2005
Posts: 2,949
Likes: 6
From: Earth
Any vacuum secondary carb is only going to let as much air through as the engine needs regardless of cfm rating. A smaller or larger 4v won't make much difference in mpg.
FWIW, the Edelbrock 500 and 600 cfm carbs have the same size primary and secondary bores/venturi. There are some internal differences, maybe, besides the jets and rods.
When the intake valve closes is the single most important factor in determining a cam's rpm range. Cams with shallower ramps - i.e. large difference between advertised and .050" duration - hold the intake open longer.
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Lead Driver
Joined: Jul 2011
Posts: 8,679
Likes: 191
From: On the Edge of the Desert
I was getting 17mpg with a screwed up 2barrel. That was at 65mph with no overdrive.
Now I've got better performance parts and a more efficient intake system. So I should at least get the same.
Now I've got better performance parts and a more efficient intake system. So I should at least get the same.
Laughing Gas
Joined: Dec 2012
Posts: 801
Likes: 7
From: Toledo, Ohio
. Where did you hear about the 4* advance... I thought they did, but just wondering where you saw/heard it...
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Posting Guru
Joined: Jul 2007
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Likes: 1
110 icl is straight up, you have a 2 degrees advance if you have the 108 icl, degee the cam! Most grinds are off... And use a a/f ratio gauge... Those are the only things that will tell you whats going on....
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Lead Driver
Joined: Jul 2011
Posts: 8,679
Likes: 191
From: On the Edge of the Desert
Now I'm not sure, but I think I just achieved close to 20mpg today.... Not sure exactly what it was, but I know it was 15 or better, leaning more towards the better side.