Cam- HP vs. gas mileage

**Liquifire** · 04-27-2006, 11:38 PM

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?

**MNR-0** · 04-28-2006, 01:27 AM

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.

**Liquifire** · 04-28-2006, 02:42 AM

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?

**nhraformula** · 04-28-2006, 04:31 PM

my stall converter is worse for mpg than my 224 cam.

**Mr. Luos** · 04-28-2006, 04:41 PM

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.

**mrr23** · 05-06-2006, 05:22 AM

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 ls1gto