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-   -   unleaded gas for early 911's? (http://forums.pelicanparts.com/porsche-911-technical-forum/146143-unleaded-gas-early-911s.html)

993.986. 01-28-2004 07:54 PM

unleaded gas for early 911's?
 
I'm sure this has probably been addressed before but I was wondering if it would be OK to use today's unleaded fuels in an early (72-ish) 911? Would you have to change valves first? I remember adding some foul looking liquid to my 71 240Z with each fill-up when I could no longer find leaded premium (whether it really did anything I don't know but I got 244,000mi on it before moving on). Thanks for your patience SmileWavy

pwd72s 01-28-2004 07:57 PM

I think that Porsche valve seats are hard enough to handle unleaded...works for me, anyway...

350HP930 01-28-2004 07:58 PM

Most early aluminum heads will have no problems with unleaded since the seat inserts are much more durable than the cast variety in iron heads which are the most in need of a coating additive.

HarryD 01-28-2004 07:59 PM

Gosh I hope it's ok since that is all I can get.

I asked Steve Weiner this question a few years ago and he assured me that I would be ok.

pwd72s 01-28-2004 08:00 PM

Quote:

Originally posted by 350HP930
Most early aluminum heads will have no problems with unleaded since the seat inserts are much more durable than the cast variety in iron heads which are the most in need of a coating additive.
That's what I meant to say..;)

Tim Walsh 01-28-2004 08:12 PM

If it's a 72 then you get away with regular unleaded (87) because it's such a low compression.

jluetjen 01-29-2004 04:27 AM

Sure -- I do it all the time! Even with a 9.9:1 CR. Not a problem!

azasadny 01-29-2004 09:54 AM

I always run unleaded (I believe 83 octane) in my '74 with a 2.7L CIS. I've never had any problems. I do put in a bottle of Techron every third fill-up during "driving season" (April through November).

CarreraS2 01-29-2004 12:02 PM

Bruce Anderson had a little piece in Pano a few years ago about this. From what I recall, ALL 911s have valve seats that are plenty hard enough to take unleaded gas, no problem.

Same for all 914s.

I think even the later 356s were ok. You had to go back pretty far to start to get to the cars that needed leaded, and as I recall, even those would last a long time on unleaded.


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