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fuel type??

darth510

darth510

New member
Hi have read some old posts but want to be sure, having only drove my 'new' 924 a few miles since ownership i have not had to fuel it, what type of fuel do i use? unleaded or super 97/98 ron? also do i need to use an additive of some kind?? it is a 1984 924 lux, never thought to ask when i bought her!!
 
Hi Hayden
All Porches from about 1975 onwards will run on standard unleaded. (The orginal source of that statement is from a Porsche engineering document BTW - I have a bookmarked link somewhere but found it on a google search)

Allegedly running Optimax or similar gives either better performance or better fuel consumption (not both!!).
My new 944 has had a catalytic fuel convertor fitted at some time - don't know why - doesn't seem to make any difference to the performance. I'll tell you if it gives super mpg when I've run the first tank-full through. As it stands at the moment it looks like the normal 23/24 round town and about 27/28 on a longer run.

 
I have owned 3 924's.
A Lux (for 10 years) in which I only used basic unleaded and never needed anything other than a new head gasked, a common fault in N/A 924's after 100K miles. I did 200k in it.

A Turbo 3 yaers and only basic unleaded exept when thrashing it big time in the Isle of Man. No probs.

An 'S' for 8 months again basic unleaded.




 
thanks a lot for that, i was getting a bit worried about waht fuel type to use, my wife runs the optimax in her renaultsport 172 and it does give better performance, will use that then, was just worried about the additive side of things-didn't fancy changing the valves!!!
 
Most engines with alluminium heads are safe with unleaded petrol because they have hardened valve seats inserted whereas iron heads have seats cut into the iron.

Very high compesiion engines can suffer with low octain fuel but that affects the pistons and the first sign of trouble is pinking.

Almost all cars built from the mid '70's onward can be used with lead free with the notable exeption of the dear old BMC 'a' and 'B' series.Lets face it they were designed in the 1930's!

Basic rule of thumb for 924's. Use ordinary unleaded from a branded (Esso, Total, Shell. BP. etc.) supplier. If you are going to blast it down an autobahn or do a trackday fill up with Optimax etc.

Don't worry, just drive.
Geoff
 
Ref, 'tin' based pellets to put in your petrol tank.

I knew an industrial chemist and his comment on the pellets was - " I cannot see how an inorganic substance such as tin can have any effect on an organic substance such as petrol".
 
Neither can I, but he needs to read back over the years and look at history.
The Broquet device was orginally developed as a war-time system by British scientists of the day and was used in Hurricanes and Tanks sent to Russia. It apparently enabled them to fly/run on very poor quality petrol (mogas) the Russians were using instead of Aviation spirit (Avgas)
Does it work? Well yes - A number of years ago I ran (confession time now!) an Mg metro fitted with the stuff. Ran unleaded in my ownership for 45k miles and after me another 35k with someone else I knew. Ran very sweetly in that time, before it eventually died from BMC tin-worm.

The company had (still does AFAIK) a guarantee that if you suffered an engine failure while using their product they would replace the engine. Again AFAIK they have never paid a claim and their device is still available.
Not knowing any better when I bought my first early 924 I looked into it. It was expensive for the 2.0 litre pack and I found out after research that in any case, unlike the BMC valves, the Porsche/Audi unit (my '79 version still had Audi rings on the cam-cover,) simply didn't need it.
Googling 'Broquet' will produce the information you want if you are interested.
HTH
 
OK never been in the echelons of MG Metro ownership, but did have a Studio2 [:'(]

As for the 924, having owned 2 and never ran the 1st one on anything but UL fuel I have so agree that the ally head with the hradened seat is never going to have a problem with 95, 98 RON sticker inside the cap or not, have to admit I put in the odd full tank of 98 super in this one every now and again, but I also do that with my 2.0l TD Vectra just to clean it out every so often.
As it stands I don't know anyone with a 924 that has had a problem using UL fuel without addatives
 
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