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Originally Posted by rocketir
Here is a good article on octane and why you should run premium when the manual recommends it.
http://www.superchargersonline.com/content.asp?ID=105
The 3.0l engines have a 10.2:1 CR and the 4.4's have a 10:1
Not sure if the heads and block are Aluminum? Anyone know?
MotorDave: "I think" that at your elevation you can get away without using premium. However I am not sure. Maybe someone in the mile high city can tell us.
Jes |
Rocket, thanks...pretty good art., but there are hundreds of sim. stuff on net. It is one of The arm wrestles and comes up on every car board about once per Qtr.
I live at 5K, but most of the driving in my "area" is at elevations less than that. My pitch on running an occas. tank of reg or mid-grade on Trips, was that I cannot tell the diff, power/temp/mpg etc., when that tank of less than 91/93 is run through in just hours on a haulazz deal up the interstate.
As for CR...easy to get hung up on that ratio but lots of stuff in any given motor have ancillary effects and will affect that motor's performance based on many add'l considerations. I'll dodge the debate, but remember a plethora of very fast, very high HP per CI or CC, motorcycles run on reg w/out a hiccup and most of the UJM 4 mfg'ers rec'd regular. I realize those motors are not same species as 3.0 or 4.4; my point is not to get hung up on comp.ratio, esp when normally aspirated.
I'll get out of this gas thread; buy and run whatcha want.
I use prem. usually, (93 here anywhere on Right coast), but an occas. tank of 89 or even 87, vis a vis the effect on these motors, is like peeing in the ocean, imo.
BR,md