Bigger Crank = less Mileage
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Member
Joined: Jun 2010
Posts: 159
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From: Hamilton, NJ
Car: 1986 Pontiac Firebird
Engine: 357ci 400hp 4BBL
Transmission: 700r4
Bigger Crank = less Mileage
I figured since this is the racing board that maybe some members have put a scat 3.75 stroker crank into their 350 engine. Myu question related to the gas mileage that you get from putting a bigger crank in. Does the Mileage really go down alot. I heard in teh past that a 350 bored .030 got 15 mpg then with the bigger crank to make it a 383 it only got 9 mpg. Is this true? thanks!
Thread Starter
Member
Joined: Jun 2010
Posts: 159
Likes: 0
From: Hamilton, NJ
Car: 1986 Pontiac Firebird
Engine: 357ci 400hp 4BBL
Transmission: 700r4
Re: Bigger Crank = less Mileage
Not the 305 I have a 350 4 bolt engine that was bored .030 over and was going to stroke it to make it a 383 but since I have only 1 car thats my daily driver I might just leave the original 305 engine in it for now until I get another 3rd gen.
Joined: Feb 2001
Posts: 13,753
Likes: 560
From: Cincinnati, OH
Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Re: Bigger Crank = less Mileage
I figured since this is the racing board that maybe some members have put a scat 3.75 stroker crank into their 350 engine. Myu question related to the gas mileage that you get from putting a bigger crank in. Does the Mileage really go down alot. I heard in teh past that a 350 bored .030 got 15 mpg then with the bigger crank to make it a 383 it only got 9 mpg. Is this true? thanks!
Senior Member
Joined: Jan 2009
Posts: 357
Likes: 0
From: Port Charlotte
Car: 90 formula
Transmission: auto
Re: Bigger Crank = less Mileage
It all comes down to the combo of parts, the fuel and ECM delivery and the overall set-up. A 400hp LS1 can get 30mpg but an older 110hp carb motor can get 17mpg. Crank length is an irrelavant factor in fuel economy. Engine set-up, design, and efficiency (i.e SPFI vs carb) make all the difference.
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