[DML] Re: Failed emmissions AGAIN
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[DML] Re: Failed emmissions AGAIN



Detonation in simple terms is the knock or pinging sound that you here on occasion if you 
lug the engine or try to accelerate quickly in 5th gear while the engine rpm is below 1500
it is sometimes called dieseling. it is caused when the air fuel mixture ignites prematurely 
or before the sparkplug fires. the ignition source is usually the combination of high 
combustion air temps and or hot carbon deposites on the top of the piston igniting the 
fuel mixture.

Dennis

--- In dmcnews@xxxxxxxxxxxxxxx, "tuxr" <tuxdarby@xxxx> wrote:
>
> Thanks very much for the info on this, I've been using 93 for this 
> car and my previous, will switch to 87 tomorrow.  Since I put 650 
> miles a week going back and forth to work, this is a real cost 
> savings.  The forum is great for stuff like this to those of us that 
> aren't very mechanically inclined.  But I had what might be a stupid 
> question: What do you mean by "less chance for detonation"???
> 
> --- In dmcnews@xxxxxxxxxxxxxxx, "Tom Niemczewski" <tomciodmc@xxxx> 
> wrote:
> >
> > Hello Dan
> > 
> > That is a very good question. And the answer to that would be that 
> whoever 
> > wrote the Owner's Handbook must have made a mistake or just forgot 
> to 
> > mention that in YOUR book. I say "your" book because mine clearly 
> states 
> > that in the USA 87 should be used and that 91 was for Europe. 
> Maybe I have a 
> > later version of the book that was updated.
> > Anyway, in the Owner's Book that I have there is a mention of that 
> on page 
> > 40. Right on top, on the right side of the page. Here's an EXACT 
> copy of 
> > that:
> > 
> > Fuel Requirements
> > USA
> > Your De Lorean is designed to operate at factory specifications at 
> UNLEADED 
> > GASOLINE only of at least 87 anti-knock index (R+M/2) (91 research 
> octane 
> > number)
> > 
> > Is this a bulletproof enough source? :)
> > 
> > Of course you might say that "at least" means that it can operate 
> on 93. And 
> > you will be right. It CANNOT use anything less that 87 because it 
> will cause 
> > damage. Anything more that 87 CAN be used. 93 CAN be used without 
> causing 
> > immediate damage to the engine but it is a great waste of money 
> and if the 
> > engine is designed to operate on 87 then 93 is not as good for it. 
> The 
> > higher the octane number the less chance for detonation but at the 
> same time 
> > combustion temperatures are higher.
> > Use 87! Your car will be much better with it in the long run.
> > And the most important thing - 93 IS NOT BETTER than 87. It is 
> just 
> > DIFFERENT! The names "premium" or "super" are just clever 
> marketing by the 
> > oil companies to make the customers feel that they are getting 
> something 
> > better that is worth the higher price. In reality they are just 
> the same but 
> > meant for different engines. The car I have here in Europe runs on 
> 95 (RON) 
> > about 91 (R+M/2). It was designed for that gas. DeLorean was 
> designed for 91 
> > (RON) which is 87 (R+M/2)
> > 
> > I hope this clears things up for you a bit. And don't forget to 
> check page 
> > 40 in the Manual.
> > 
> > 
> > Tom Niemczewski
> > vin 6149 (in Poland!)
> > tomciodmc@xxxx
> > www.deloreana.com
> > 
> > 
> > 
> > ----- Original Message ----- 
> > From: "Dan" <djdanwilson@xxxx>
> > To: <dmcnews@xxxxxxxxxxxxxxx>
> > Sent: Saturday, December 17, 2005 10:20 AM
> > Subject: [DML] Re: Failed emmissions AGAIN
> > 
> > 
> > > --- In dmcnews@xxxxxxxxxxxxxxx, "Tom Niemczewski" 
> <tomciodmc@xxxx> wrote:
> > >>
> > >> One of the reasons for your failed emissions might be the 
> prolonged
> > > use of
> > >> premium fuel.
> > >
> > > Tom, here's another good question for you, or for anyone else 
> that can
> > > address it:
> > >
> > > The DeLorean was manufactured to be sold in the United States 
> with the
> > > exception of the 100 or so cars in the 17000 VIN series which 
> were for
> > > Canada, right? The car was not technically for sale in Europe. 
> That
> > > being the case then why would American cars intended and 
> destined for
> > > sale in the U.S. market come with Owner's Handbooks that 
> reference the
> > > European 91 octane rather than the U.S. 91 octane?
> > >
> > > If the 91 octane referenced in the DeLorean Owner's Handbook was 
> the
> > > European 91, and not the U.S. 91,
> >
>








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