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Thread: Cam- HP vs. gas mileage
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04-27-2006, 11:38 PM #1
Cam- HP vs. gas mileage
what I was wondering was at what point does the gas mileage drop off dramatically when going with a bigger cam? Does it happen in the 220's, 230's or bigger?
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04-28-2006, 01:27 AM #2
Anything bigger than stock will result in less gas mileage. It is more obvious when at idle, due to the increased overlap. If you spend a lot of time in city traffic, a cam of 220 or more duration will double your fuel consumption at idle and just off-idle.
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04-28-2006, 02:42 AM #3
I do not spend a lot of time at idle.........I was concerned more with cruising speeds.........is a bigger factor the lobe separation or the lift? Probably a bit of both would be my guess........anyone?
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04-28-2006, 04:31 PM #4
- Join Date
- Dec 2002
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- n/w chicago
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- 54
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- 6,932
black- 2000 nhra edition formula
my stall converter is worse for mpg than my 224 cam.
2000 nhra edition formula
a few bolt ons, 379 rwhp
11.96 @113.25
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04-28-2006, 04:41 PM #5
- Join Date
- Aug 2005
- Location
- Thornton, CO
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- 23,773
Red Tint Jewelcoat- 2008 Trailblazer SS
226/234 554/575 112 Lunati grind.
I got 27.5 MPG on the highway and 22.5 MPG around town with mostly light driving.
It was on the stock tune.2008 Trailblazer SS
Yank PTB3600, Kooks 1 7/8" LT's, 4" intake, E-fans, Magnaflow, Sonnax kit, tranny cooler, tune.
Lowered, HID's, tinted.
1999 Pontiac Trans Am WS.6 #1747 SOLD
531.1 RWHP 481.3 FT/Pounds all motor.
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05-06-2006, 05:22 AM #6
just depends. i know of a person that went from the stock cam in his 04 gto to a vinci 079 cam and 1.8 rockers. picked up 50 rwhp and 4.5 mpg.
cam specs
DUR @ .004" 272*/280*
DUR @ .050" 210*/218*
LIFT .551/.551
OVERLAP 48*
LSA 116*
he goes by jonlee on ls1gtoCold Air Intake, Muffler Delete, Vinci High Performance Dual Valve Springs, Hardened Pushrods, Yella Terra 1.85 Rockers, Some Hydropdipped Stuff, Strut Tower Brace, Some SS Badges, boost/vacuum gauge, fuel pressure gauge, some checkered stripes, drilled/slotted rotors, ZL1addons Stealth wickerbill, Ruxifey LED side markers
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