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Still Doin Time
Join Date: Nov 2004
Location: Nokesville, Va.
Posts: 8,225
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Euro 3.2 w/10:3-1 vs. Us Spec 9:3 Question
OK. Dumb question. Why can the Euro spec 3.2 with 10:3-1 static compression ratio run on pump gas, single plug when everyone tells me that you cannot exceed 10:1 static ratio?
It's my understanding European fuel quality (octane) is not as good (comparable) to US 93 octane. Is it just more aggressive cam timing that 'bleeds' some of that cyl prssure off. I've gotten very different answers from other builders.
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'15 Dodge - 'Dango R/T Hauls groceries and Kinda Hauls *ss '07 Jeep SRT-8 - Hauls groceries and Hauls *ss Sold '85 Guards Red Targa - Almost finished after 17 years '95 Road King w/117ci - No time to ride, see above '77 Sportster Pro-Street Drag Bike w/93ci - Sold |
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11-30-2004, 03:13 PM
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Irrationally exuberant
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As I understand it, Europeans got a higher octane fuel than the US.
If you actually measure the compression on factory motors (including that one) you'll find they measure less. I haven't measured it myself but I've heard this from more than one engine builder. The "10.3:1" motor probably measures closer to 10:1 or less. The Euro and US motors uses the same cams and the same cam timing. 9.8:1 was the number I've heard for the upper limit on pump gas for street use. -Chris
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'80 911 Nogaro blue Phoenix! '07 BMW 328i 245K miles! http://members.rennlist.org/messinwith911s/ |
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11-30-2004, 04:21 PM
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Registered
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Quote:
The Euro 3.2L with these higher compression had a more aggressive ignition & fuel mapping program in the DME chip than their USA bound 3.2 brothers. That and no catalytic converters and the higher octane make it work I suppose. Funny about all the comotion over the USA vs Euro 3.2 p/c. As I mentioned in my 3.2 cam thead, there is barely any visual difference b'tween the two...and one really has to stare and compare the two against each other in order to detect it....and it's not easy to do!! cheers!!
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Johnny Riz 1973 911 Custom Euro 3.2L "Sports Purpose" '10 Subaru WRX-STi Hatch - modded. RGruppe#152 Early 911S Reg.#335 |
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11-30-2004, 09:05 PM
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Registered
Join Date: Nov 2004
Location: Mi
Posts: 330
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The octane myth
It is a myth that Europe gets better gas than the US. There are two main rating systems for octane, RON and MON. Europe, or at least England where I'm from originally rates octane RON. The US uses PON which is the average of RON and MON. UK 98 octane (RON), is 90 MON or in US terminology 94 octane which is the average.
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Adrian Thompson Beater Boxster and three Volvos |
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12-01-2004, 06:31 AM
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Registered
Join Date: May 2003
Posts: 3,346
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Seeing as how all I can get in California is 91 octane I'd say 94 is higher by quite abit.
-Andy
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72 Carrera RS replica, Spec 911 racer |
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12-02-2004, 09:22 AM
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The Blue Pheonix
