Unleaded vs Premium |
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Unleaded vs Premium |
Neal |
Sep 8 2003, 01:24 PM
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#1
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Member Group: Members Posts: 300 Joined: 23-April 03 From: Sammamish, Washington Member No.: 605 |
I wanted to know for a engine developed in the 70's and rebuilt in the 2000's do you think 4 octane points higher makes a difference on how the engine performs as a daily driver ?
(IMG:style_emoticons/default/icon14.gif) Attached File(s) Firef4_2Ejpg.jpe ( 60.06k ) Number of downloads: 0 |
kdfoust |
Sep 8 2003, 08:04 PM
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#2
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Senior Member Group: Members Posts: 694 Joined: 2-January 03 From: Riverside Member No.: 71 Region Association: Southern California |
I put prem in my 72 1.7. Never tried regular or medium (what's the middle grade called anyway?). I've been assuming that the engine would detonate it's self to pieces on regular.
Here's a piece for the puzzle: I used to have a '97 F150 which ran "better" on premium but got worse fuel economy. I repeated the experiment over and over switching between reg and prem. Reg~16 Prem~13. I always assumed that the engine controls ran the timing with more advance (less propensity to knock with prem) on premium thus yielding slightly better performance but worse mileage. I wasn't really "into" the truck so I never bothered to investigate the engine control system to verify that idea. How's that apply here? Simplistically would you set the timing slightly retrograde from the spec if you want (insist) to run reg - right? Have fun, Kevin |
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