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Old 01-22-2003, 11:25 PM   #1
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C3 mpg info

Since my 72 is a distance cruiser, I'm interested in decent mileage more than track performance. So I'm putting together a profile of C3's that get 20 or more mpg on the highway. Any one interested check this.
http://temp.corvetteforum.net/c3/roa...ae_profile.htm
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Old 01-23-2003, 02:19 PM   #2
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Re: C3 mpg info

Quote:
Originally posted by biltogo
Since my 72 is a distance cruiser, I'm interested in decent mileage more than track performance. So I'm putting together a profile of C3's that get 20 or more mpg on the highway. Any one interested check this.
http://temp.corvetteforum.net/c3/roa...ae_profile.htm
Are you thinking about a gear change? Different carb?

Good to see you here, Rudy.
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Old 01-23-2003, 08:15 PM   #3
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I'm gonna bump the compression with RPM heads, and sometime install a 200R od tranny.

I've been working on a self designed plenum for a Performer manifold. Actually the 2nd version. I've routed the intake runners differently and have so much more vacuum draw to the carb now that I'm re-engineering the air bleeds. During October and November it would cruise just on air bleed idle gas to 35 mph. With an out of the box manifold it would start using throtle jet gas at 25-30 mph.
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Old 01-24-2003, 10:33 PM   #4
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Quote:
Originally posted by biltogo
I'm gonna bump the compression with RPM heads, and sometime install a 200R od tranny.

I've been working on a self designed plenum for a Performer manifold. Actually the 2nd version. I've routed the intake runners differently and have so much more vacuum draw to the carb now that I'm re-engineering the air bleeds. During October and November it would cruise just on air bleed idle gas to 35 mph. With an out of the box manifold it would start using throtle jet gas at 25-30 mph.
Wow! You are very talented, Rudy. What is the most MPG you can expect to get out of her?
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Old 01-27-2003, 10:31 PM   #5
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Quote:
Originally posted by biltogo
I'm gonna bump the compression with RPM heads, and sometime install a 200R od tranny.

I've been working on a self designed plenum for a Performer manifold. Actually the 2nd version. I've routed the intake runners differently and have so much more vacuum draw to the carb now that I'm re-engineering the air bleeds. During October and November it would cruise just on air bleed idle gas to 35 mph. With an out of the box manifold it would start using throtle jet gas at 25-30 mph.
WOW!!! I wish I knew how to figure that out!

Have you considered going the FI route? I have a little experience with installing FI into older vehicles, including my Jeep and a LT1 into a C3.

If you need a hand, I'll help out as much as I can, just holler.
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Old 01-28-2003, 12:20 AM   #6
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Thanks Tim, I have kind of a secret ambition to get the same cruising mileage as an FI car. I'll keep pecking away at it. Actually my plenum design mimmicks an FI manifold principle. If you looked at the chart I made, you'll see that it's not impossible.
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Old 01-28-2003, 01:36 PM   #7
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I noticed some of the mpg ratings were equal to those of a FI car. If everything works out like you plan, I would patent your design and try selling it. You could be the next Edelbrock or Weiand!! That would be cool.
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Old 02-05-2003, 01:09 AM   #8
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I was getting 15 mpg
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Old 02-09-2003, 09:23 PM   #9
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i had about 22mpg on the highway with a 327 holley 600 and 3.08 gears.

i changed carbs and now i dropped down to about 17mpg (if i keep my foot out of it)
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Old 02-12-2003, 02:59 AM   #10
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I was getting 12ish
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Old 02-17-2003, 10:53 PM   #11
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Quote:
Originally posted by BubbleHead
......If everything works out like you plan, I would patent your design and try selling it. You could be the next Edelbrock or Weiand!! That would be cool.
That's great. I will order 10,000 Regelin's and run old man Edelbrock right out of business!

Nothing like gettin in on the ground floor.
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Old 02-17-2003, 11:17 PM   #12
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Old 02-18-2003, 07:59 PM   #13
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Quote:
Originally posted by Rich's75
That's great. I will order 10,000 Regelin's and run old man Edelbrock right out of business!

Nothing like gettin in on the ground floor.
ME TOO!!! I'm ready to be rich!
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