THE KOMBI KONNECTION

Gabbo's Run · Posted: Wed Dec 19, 2007 5:54 pm Post subject:

thanks rob, i read you.

brian
_________________
brian and cathy

1990 T3 Goldie
Once A king always a king, once a nights enough.

Gabbo's Run · Posted: Wed Dec 19, 2007 6:21 pm Post subject:

And thank yuou also mate.

you know who you are.

brian
_________________
brian and cathy

1990 T3 Goldie
Once A king always a king, once a nights enough.

the aussie trimmer · Posted: Wed Dec 17, 2008 5:49 am Post subject:

I have always used premium in all my VW’s; I also run a fuelstar tin canister and my cars do run better on premium, so I for one will keep on useing it.
_________________
---------------------------------------------
Kev.

KK members unite, turn on your lights. (Be SEEN drive SAFE) Help someone live GIVE BLOOD

Kinga · Moderator Joined: 20 Sep 2007 Posts: 487 Location: Perth

I was told by a very reputable VW mechanic that because VW engines are air cooled, they are designed to run at much hotter temps anyway.

So there wasn't the need to do anything extra to the valve set-up if rebuilding or to use an additive.

As for premium v regular unleaded, when you actually get what you pay for I notice the difference in my late model euro car (twin turbo 6 that specifies high octane fuel use).

The problem is that most of the time the high octane fuel performs no different to the regular now days (but the price difference is getting larger). I am really discerning about where I buy premium from to make sure its worth the premium price.

As for running high octane in VW's

I used to run my dual cab on Avgas (100 octane) every now and then just for fun. It certainly ran a lot better Very Happy

_________________
Kinga

Keith D · Posted: Wed Dec 17, 2008 11:46 am Post subject:

In my Kombi there's no noticeable difference in performance or economy whether I use ULP or ULTRA.

My original handbook advises that 91 Octane petrol is the fuel requirement, which is the Octane rating of ULP.

Keith D

Brookie · Posted: Wed Dec 17, 2008 12:08 pm Post subject:

W.A. Fuel is different then the rest of Australia-almost different than the rest of the world.
Quite a few years ago when fuel prices started to rise some independants were bringing petrol in from Singapore which was selling well below local prices.
As we have only one refinery some marketing genius convinced the Govt of the day that the petrol processed at BP Kwinana was the cleanest in the world.
Subsequently legislation was passed that ONLY this formula can be sold in W.A.
This means , like nearly happened a couple of years ago when stocks got low and Kwinana had a problem, we cannot import fuel from anywhere including Eastern States..... but we can import from Canada. This is from a BP Refinery out of Vancouver which just happens to be the only refinery in the world using the same formula. Twisted Evil

People who drive some of the late model turbos and drive over from east are shocked at difference in running and many have fuel readouts and cannot believe what we have here.
Hooray for aircooled VWs- most will run somehow on power kerosene through to Avgas and Scotch whiskey also.

---------------------------------------
_________________
Kombis Keep you Younger

73 Sopru Poptop-under resto

aussiebug · Posted: Wed Dec 17, 2008 7:28 pm Post subject:

Weelll, probably NOT on Scotch wiskey - that's 60% water, so only 40% is alcohol, and ALL ethyl alcohol contains 40% used oxygen, so that means 40% of the 40% alcohol content of whiskey is not available to the engine. Better to use that to fuel yourself, so long as you aren't driving afterwards!

Even 10% ethanol (E10 petrol) makes a bug (or any carburetted engine) run 4% lean, and performance WILL suffer unless you increase the main jet size to richen the mixture back into stoichiometry (air/fuel balance).

The bug engine has hardened steel valve seats so it does not suffer from valve seat recession (leaded fuels stopped VSR in engines with "soft" cast iron heads).

The bug engine has exposed valve stems (no rubber caps), and phosphor bronze valve guides; so the valves get enough lubrication from the engine oil - they don't need the extra lubrication provided by the oily Tetra Ethyl Lead additive in leaded fuels (this lubrication was useful in cast iron heads to help lubricate valves stems).

The bug engine needs only 91RON (87AKI in the USA) octane for normal compression engines, and it doesn't matter HOW the refinery gets the 91 number. That number is only an anti-knock indicator, so buying a higher octane fuel does NOT help the engine at all.

BUT - some high octane fuels are also formulated as more dense fuels - there's more carbon and hydrogen atoms per litre, so there is a little more fuel in the fuel, if you follow that. That will make carburetted engines like the VW run a little richer, and of course we all know that richer means a little more power, so some higher octane fuels MIGHT help engines which are otherwise running a little on the lean side - but not because of the octane rating.
_________________
Rob
Rob and Dave's aircooled VW site
Repairs and maintenance for the home mechanic
http://www.vw-resource.com

liam:-) · Posted: Thu May 07, 2009 5:15 pm Post subject: