LT1-LT4 Modifications 1993-97 Gen II Small Block V8

How does a cam effect gas mileage?

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Old Sep 1, 2004 | 08:34 AM
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Default How does a cam effect gas mileage?

I'm looking to ugrade my cam and heads i was wondering how it will effect fuel ecconomy. Right now i see 20/27, my engine has 62k, and i have emmissions. With our emmissions if you spend more than $600 on emmission related parts and labor, you can get a waiver so i am going to not even worry about emmissions. Also there are certain car enthusiasts who will pass you for the love of the car, or who you can pay.

Anyway i was looking at a thread and saw the 1LE, 2LE,and 3LE packages. I was looking to go with the 3LE, LT's, and pretty much all of the bolt-on's. I was just wondering how this would efect my fuel ecconomy. The 1LE is like the Hotacam and the 3LE is like the 847.
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Old Sep 1, 2004 | 03:19 PM
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More power USUALLY = Lower MPG.
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Old Sep 1, 2004 | 06:04 PM
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Originally Posted by Nova5
More power USUALLY = Lower MPG.
He's right. With the exception of exhaust upgrades and the upgrades on the intake side, pretty much everything else will worsen your gas mileage.
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Old Sep 1, 2004 | 07:08 PM
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Isn't the modern combustion engine only like 17% or 30% efficient? Not that this has anything to do with it, but just trying to remember. Any idea of how much of a loss i will have?
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Old Sep 2, 2004 | 03:29 AM
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I'm running LE heads, 3600 stall now(used to run the 3000), 3.73's, and a small Joe O. cam. Since the cam is small it helps me out with gas mileage, but I'm getting 19-21mpg with mixed driving and 17-18mpg all city/racing. I'm running the times in my sig.
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Old Sep 2, 2004 | 02:43 PM
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Wow your set up is EXACTLY what i was going to go with. I was just gonna get a LE head/cam packaged and 42lb injectors, but the same. Those are awsome times! exactly where i want it to be.
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Old Sep 3, 2004 | 03:05 AM
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42lb injectors will be too big, stick with some 30lbs. I have the le1 heads but with REV 2.0/1.56 valves. I run such a small cam because I want my car to be a sleeper(Lloyd wanted me to run the le1 cam, but I had him have Joe make me a smaller cam with less lope), and with the idle up and through a stock muffler you can't hear the cam at all. It sounds like it might have a catback and thats it. My buddy just put in the le1 cam and it sounds MEAN compared to my car. Email me if you want a soundclip of the car. a97blackformula@yahoo.com
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Old Sep 3, 2004 | 03:15 AM
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If your looking for gas mileage, buy a kia. The heads and cam will eat your mpg up, but thats any horse power in general
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Old Sep 3, 2004 | 01:47 PM
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I can still squeak out 24mpg on the highway if I baby it
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Old Sep 3, 2004 | 02:18 PM
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Originally Posted by skinnies
42lb injectors will be too big, stick with some 30lbs. I have the le1 heads but with REV 2.0/1.56 valves. I run such a small cam because I want my car to be a sleeper(Lloyd wanted me to run the le1 cam, but I had him have Joe make me a smaller cam with less lope), and with the idle up and through a stock muffler you can't hear the cam at all. It sounds like it might have a catback and thats it. My buddy just put in the le1 cam and it sounds MEAN compared to my car. Email me if you want a soundclip of the car. a97blackformula@yahoo.com
I would like a sound clip.......onebadz@earthlink.net
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Old Sep 4, 2004 | 09:47 PM
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Dont mod it if your concerned about gas mileage, its not a Honda.

Last edited by Bizzzatch350; Sep 4, 2004 at 10:28 PM.
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Old Sep 4, 2004 | 10:53 PM
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It's nothing with gas mileage like that. My TT 3000gt got 17mpg and that was fine. My dad had a truck with a 454 and it got 8mpg. I just didnt want much less than 17 is all. I think around 15mpg would be fine. I am only concerned becuase this will be my daily driver and i want to be somewhat reasonable. I'd also like to put it in the mid 11's with about $3500 which i think could be possible if i do all the work myself.
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Old Sep 5, 2004 | 12:12 AM
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skinnies,

I just sent you an email requesting a soundclip as well. I'm interested in this, and even more so with the LE2 setup. I have the cc305 right now, nice drivability, passes smog, and nice mild lope to it. But once I do smog again, I wanna try something a lil meaner. If either of those cams sound like the cc306, that'll be even more convincing
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Old Sep 7, 2004 | 05:37 AM
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MY $.02 is that I drove from here to Tallahassee Florida on a single tank of gas (had to fill up as soon as I rolled into town) when I just had headers and bolt-ons. Since I've added a stall, a big cam, and LE heads. I made the trip again a month ago, and got the exact same mileage.

Your results may vary, cruising I get the same MPG as before. When I get on it, its DEFINETLY a lot less.
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Old Sep 7, 2004 | 10:56 AM
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The more overlap in your cam the less mpg you will get. Since the stock cam has 45* of overlap if I remember correctly then you can get yourself into trouble quickly.

Rich
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Old Sep 11, 2004 | 03:34 PM
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after my cam install i got 15/23. before I got 17-18/21-22.
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Old Sep 13, 2004 | 01:27 AM
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Originally Posted by OneMeanZ
I would like a sound clip.......onebadz@earthlink.net
Guys who want a sound clip hit me up on aim "a97blackformula" is my screen name. Yahoo doesn't like attaching the big file to an email on my dialup.
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