| [ Total Views: 1416 | Total Replies: 20 | Thread Id: 107699 ] |
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 MissTB
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| posted on November 20th, 2014 at 09:19 PM |
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Swith to unleaded petrol?
Hi,
does anyone know what needs to be done so older cars can be converted to using unleaded petrol? Thank you
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BRUTUS
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| posted on November 20th, 2014 at 09:32 PM |
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Any original/standard superbug should run well on 91 ULP. Some volks prefer 95 ULP (not really necessary for original 7.5:1 compression engine -- but
may be good "insurance" if your ign.-timing is way out!). If you hear PINGING on 91 ulp, change to 95 ulp.
You shouldn't need any additives, though again some feel happier using them.
ACE 30 & 40 oils: specifically engineered for your Air Cooled VW
delivered (free del.) throughout Yarra Valley / Ranges, & Gippsland areas. Also ACE 20, 50 & 90.
FOR SALE: ACE 30, 40 etc. Oil formulations & Trade-names.
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donn
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| posted on November 20th, 2014 at 09:34 PM |
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Nothing for our old dubs, they run fine on unleaded but keep away from E10
I dream of a day when a chicken can cross a road without being asked for it's motive!
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MissTB
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| posted on November 20th, 2014 at 09:41 PM |
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Thank you both, this board is amazingly informative!
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 helbus
A.k.a.: Pete S
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| posted on November 20th, 2014 at 09:56 PM |
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Beetles were Unleaded from 1968. Nothing to do if after this date.
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AA003
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| posted on November 22nd, 2014 at 06:04 AM |
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All fuel is unleaded.
I wouldn't put 91 in my lawnmower.
Low octane fuel used to burn valves when it had lead in it.
Just do your VW a favour and put 95/98 in it. It can't hurt it.
I read it on samba, so it must be correct.
Sometimes Volkswagen dealers sell spare parts. Amazing isn't it!
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Shuffs
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| posted on November 22nd, 2014 at 06:20 AM |
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| Quote: | Originally
posted by AA003
All fuel is unleaded.
I wouldn't put 91 in my lawnmower.
Low octane fuel used to burn valves when it had lead in it.
Just do your VW a favour and put 95/98 in it. It can't hurt it.
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Same here,95 in everything,(including the mower),it costs a little bit more,but the improved economy, takes a bit of the pain away 
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Paul Smith
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| posted on November 22nd, 2014 at 03:14 PM |
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Correct me if I'm wrong but I thought any engine that doesn't have stainless steel valves and seats should have an upper cylinder lubricant like
Morrie's added to the fuel.
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helbus
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| posted on November 22nd, 2014 at 05:16 PM |
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Original cast iron heads on other models of cars ran on unleaded with no valve seats at all, with hardened valves for many years. On unleaded they
need the Upper cylinder head lubricant. Most cast iron heads now have hardened valve seats. If you converted a cast iron head car to LPG you had to
get hardened seats.
Alloy heads usually have hardened valve seats anyway, so Lubricant is not required.
My wife was recommended by someone to put a tank of 98RON in the Beetle, and the car didn't run well at all, as the timing and compression is stock,
so it is set up for 91RON. So compression ratio, timing and plugs need to be part of your fuel selection. It does all go together in a older carbie,
distributor car.
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AA003
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| posted on November 22nd, 2014 at 06:05 PM |
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| Quote: | Originally
posted by helbus
My wife was recommended by someone to put a tank of 98RON in the Beetle, and the car didn't run well at all, as the timing and compression is stock,
so it is set up for 91RON. So compression ratio, timing and plugs need to be part of your fuel selection. It does all go together in a older carbie,
distributor car.
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But pre unleaded fuel, most people ran 98. What has changed?
I read it on samba, so it must be correct.
Sometimes Volkswagen dealers sell spare parts. Amazing isn't it!
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BRUTUS
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| posted on November 22nd, 2014 at 06:29 PM |
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Well actually no.
We VW owners (economical devils) in the 60's-70's usually ran Standard (or Regular) which was 89 octane min. (and often contained more lead than
the the 98 super, but that's another story).
Or we used BP Super-Mix, with 25% Super (or whatever the minimum increment was) added to the Regular.
Use the lowest octane that will work well. Modern high octane fuel uses much higher amounts of "aromatics".
ACE 30 & 40 oils: specifically engineered for your Air Cooled VW
delivered (free del.) throughout Yarra Valley / Ranges, & Gippsland areas. Also ACE 20, 50 & 90.
FOR SALE: ACE 30, 40 etc. Oil formulations & Trade-names.
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AA003
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| posted on November 23rd, 2014 at 06:06 AM |
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| Quote: | Originally
posted by BRUTUS
We VW owners (economical devils) in the 60's-70's usually ran Standard (or Regular) which was 89 octane min. (and often contained more lead than
the the 98 super, but that's another story).
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......and they burnt out valves.
You cannot hurt an engine by running higher octane. But you can if you run lower.
Unleaded 91 is usually around 88/89.
I read it on samba, so it must be correct.
Sometimes Volkswagen dealers sell spare parts. Amazing isn't it!
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Joel
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| posted on November 23rd, 2014 at 08:32 AM |
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| Quote: | Originally
posted by helbus
My wife was recommended by someone to put a tank of 98RON in the Beetle, and the car didn't run well at all, as the timing and compression is stock,
so it is set up for 91RON. So compression ratio, timing and plugs need to be part of your fuel selection. It does all go together in a older carbie,
distributor car.
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High octane fuel is a slower burn and needs more advance,, even a bone stock engine can be tuned to run better on it, regular 91 unleaded is cats
piss.
I set my mates Superbug up to run like that as its only a weekend cruiser so stock 1600 only gets 98.
it gets better mpg now and runs slightly better but can only have 98 now
you pay more at the bowser but better economy and more power balance it out.
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jedsgpz
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| posted on November 24th, 2014 at 05:48 PM |
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The sticker inside the fuel flap on my 73 Squareback says 91RON, and I run Flashlube with 91 at the recommended mix ratio. I have been driving it as
my daily driver (up to 2 weeks ago, when I was taken out from behind) for the last 5 years, and the previous owner for the preceding 6 years.
The car doesn't ping, gets great economy, and for a dead stock engine develops good performance, uses bugger all oil between changes.
Nymeyer's VW specialists at Belmont North (near Newcastle) recommend nothing else for a dead stock engine of that era!
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AA003
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| posted on November 24th, 2014 at 05:52 PM |
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Why do you need flashlube then?
I read it on samba, so it must be correct.
Sometimes Volkswagen dealers sell spare parts. Amazing isn't it!
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jedsgpz
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| posted on November 24th, 2014 at 06:36 PM |
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Because engines run a bit hotter on unleaded than they do on leaded, and for the price it's a cheap additive!
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AA003
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| posted on November 24th, 2014 at 06:56 PM |
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| Quote: | Originally
posted by jedsgpz
Because engines run a bit hotter on unleaded than they do on leaded, and for the price it's a cheap additive!
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I haven't heard that one before. I know that they run hotter using 91, but flashlube won't make it run any cooler.
I read it on samba, so it must be correct.
Sometimes Volkswagen dealers sell spare parts. Amazing isn't it!
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jedsgpz
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| posted on November 24th, 2014 at 08:20 PM |
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No, flashlube won't make it run cooler, but will provide a measure of valve/upper cylinder lubrication that was previously provided by leaded fuel.
According to advise given to me by the reputable long time VW specialist mechanics previously mentioned, VW engines run hotter on unleaded fuel be it
91, 95 or 98, and due to a stock engine being of low compression, there is no benefit to be gained by using higher octane fuels!
These guys know their stuff, being second generation VW specialists, so I for one trust their opinions, if others don't choose to, so be it, I can
only judge on how my car performs, and as stated previously, it performs very well!
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1303Steve
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| posted on November 25th, 2014 at 09:20 AM |
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Dont buy high octane fuel from servos that have low turnover, it can go stale
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modnrod
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| posted on November 25th, 2014 at 09:58 AM |
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Or if the temp goes over lo-mid 40s with the sun on the bowser, it won't even pump.
If you're tuned to run 98 then you're inside drinking crap roadhouse coffee for hours until the pump works again.
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AA003
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| posted on November 25th, 2014 at 12:40 PM |
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| Quote: | Originally
posted by jedsgpz
VW engines run hotter on unleaded fuel be it 91, 95 or 98,
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I will have to agree to disagree on that one.
I read it on samba, so it must be correct.
Sometimes Volkswagen dealers sell spare parts. Amazing isn't it!
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