[s-cars] Tat..Tat Noise in Engine

[Grant Lenahan]

Ah, actually, I see. Its 89 RON.  I forget, what does that correspond 
to in RON+AKI/2?

I'm not scolding anyone, byt the way.

That said, using relatively volatile (low anti-knock properties) gas in 
a car that develops 1.something times normal compression, is simply not 
going to work all that well.  The ideal gas law says so.  Given the 
small difference between the cost of 89 and 93, i feel its false 
economy - especially if it exceeds the adjustment limit of the knock 
sensor and damages an engine. How many $0.06/ gallon savings does it 
take to buy a lower-end rebuild?

So, if RON 89 > RON+AKI/2 92, it should be fine. however, I dont get 
this "alternate" thing. It either knocks or it doesnt. Knocking every 
other week is still bad ;_0

Grant



On Jul 3, 2006, at 8:18 PM, brian hoeft wrote:

> yeah maybe lifters,, maybe injectors
>  
> but grant, i wouldnt be so quick to scold max on his fuel unless you 
> know him and the region he buys his fuel from very well.
>  
> if youre relative neighbors, maybe, but from what ive learned, simple 
> numbers like 89/91/95 whatever,, are way different on other sides of 
> the ocean, as well as other factors.
>  
> my 20v w/25 psi of rs2 boost doesnt sip anything but eastern american 
> '93, but my stage 3/4 10v 5k ran fine on '91
>  
> regardless max, unless it gets noticeably worse, tearing down and 
> rebuilding that motor will not be cheap, and youll probably sleep 
> better w/the $$$ still in your bank account.
>  
> speaking from experience w/the previously mentioned 5k,, enjoy it 
> while it lasts.
>  
> On 7/3/06, Grant Lenahan <glenahan at fastmail.fm> wrote: Wow - so many 
> unrelated issues to address!
>>
>> 1.) My first guess would be valve lifters, and if so, its no big deal.
>> 2.) 89 octane is too low for a -any- turbo car
>> 3.) rislone probably wont help anything unless your engine has been
>> gunked up.   I think you need to explain what you are thinking, unless
>> everyone but me knows already.....
>>
>> Grant
>> On Jul 3, 2006, at 7:27 PM, Max Hoepli wrote:
>>
>> > I have a MC engine in Type 44 Quattro, with turbo charger  with
>> > 285,000 km. when idling it makes a
>> > tat...tat....tat......tat.......tat...noise from top part of engine.
>> > When inside of car noise is not heard. Engine never overheats, 
>> starts
>> > immediately. Sometimes there is white smoke coming out of exhaust 
>> just
>> > after starting. I alternately fill tank with RON 89 and 91. What 
>> could
>> > problem be?...if any? Gasoline may be issue. Could Rislone additive
>> > help?
>> >
>> >
>> > Max
>> > _______________________________________________
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>> > quattro at audifans.com
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>> > ---
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>>
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