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Old 07 Mar 2011, 07:51 am
Jim Crugnale
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Default fuel type in new tl w/ sh awd

The manual says that regular gas can harm the engine. Any real
expert, including Porsche engineers, say that the only reason auto
manufactures say to use premium fuel is to support the horse power
rating. If Porsche engineers say you can use regular gas in a
Porsche, I would think it would be ok in an Acura.

But the phrase "regular gas can harm the engine" - how? Any truth to
this claim?

Thanks!
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  #2 (permalink)  
Old 08 Mar 2011, 06:13 am
pj.chris@verizon.net
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Default Re: fuel type in new tl w/ sh awd

On Mon, 7 Mar 2011 05:51:52 -0800 (PST), Jim Crugnale
<jcrugnale@amh.org> wrote:

>The manual says that regular gas can harm the engine. Any real
>expert, including Porsche engineers, say that the only reason auto
>manufactures say to use premium fuel is to support the horse power
>rating. If Porsche engineers say you can use regular gas in a
>Porsche, I would think it would be ok in an Acura.
>
>But the phrase "regular gas can harm the engine" - how? Any truth to
>this claim?
>
>Thanks!


This comes up all the time. The correct answer is YES it CAN harm the
engine. The higher the compression ratio and combustion pressures
inside the cylinder, the higher the octane rating of the fuel must be
to prevent a condition called detonation from developing. Unlike
normal combustion, which is a controlled (but very fast) burn of the
fuel/air mixture in a wave across the cylinder, detonation is an
actual explosion, causing hammer blows to the inside of the cylinder.
However, most modern high compression engines control the spark
advance, valve timing and fuel injection via a series of sensors. If
the sensors detect the sound of "knocking (detonation)" in the engine
when fuel of too too low octane is being used in the engine, the
computer will adjust things to stop/limit the knocking. IF you drive
the engine gently, you most likely will not hurt the engine, but your
ability to drive the car as designed is gone. Just one heavy
acceleration with a defective knock sensor and the engine can be
toast.

So, running fuel below 91 octane in the engine means you are relying
on these sensors to catch detonation and pre-ignition quickly enough
to protect the engine from damage. You are betting on them working
perfectly. If you blow a hole in a piston, bend a connecting rod or
burn and swallow a valve, you're looking at a new engine. Compare the
cost of a new engine with the additional cost of 91+ octane fuel over
87 over the life of the car and you'll see it is worth protecting the
engine.

Run it on 91 or better, enjoy the power without fear of blowing the
thing up.

If you are ever caught having to use regular fuel, don't fill the
tank, drive the engine as gently as possible and get premium into the
tank as quickly as possible. Continue to drive gently until the
second fill up.

One last point. Don't run regular and dump octane extenders into the
tank to get you to "premium". You are relying on perfect mixing,
perfect proportions by volume and compatability with the fuel system,
especially the injectors. And, ironically, it is more expensive than
running premium.

Paul


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  #3 (permalink)  
Old 08 Mar 2011, 08:17 am
Tegger
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Default Re: fuel type in new tl w/ sh awd

Jim Crugnale <jcrugnale@amh.org> wrote in news:e4bcfc0c-aae1-4ac4-b531-
391d857eb5ae@w9g2000prg.googlegroups.com:

> The manual says that regular gas can harm the engine. Any real
> expert, including Porsche engineers, say that the only reason auto
> manufactures say to use premium fuel is to support the horse power
> rating. If Porsche engineers say you can use regular gas in a
> Porsche, I would think it would be ok in an Acura.
>
> But the phrase "regular gas can harm the engine" - how? Any truth to
> this claim?
>
> Thanks!




What pj.chris says is substantially correct.

What Porsche and Honda do inside their engines have nothing to do with one
another; apples and oranges, as they say. Honda designed the TL's engine to
use 91-octane on a regular basis, not 87-octane. Therefore, 91 is what you
should use.

The use of 87-octane is permissible if that's all that's available at the
time, but you should not use it as a matter of course.


--
Tegger
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  #4 (permalink)  
Old 08 Mar 2011, 07:31 pm
Elmo P. Shagnasty
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Default Re: fuel type in new tl w/ sh awd

In article
<e4bcfc0c-aae1-4ac4-b531-391d857eb5ae@w9g2000prg.googlegroups.com>,
Jim Crugnale <jcrugnale@amh.org> wrote:

> The manual says that regular gas can harm the engine. Any real
> expert, including Porsche engineers, say that the only reason auto
> manufactures say to use premium fuel is to support the horse power
> rating. If Porsche engineers say you can use regular gas in a
> Porsche, I would think it would be ok in an Acura.
>
> But the phrase "regular gas can harm the engine" - how? Any truth to
> this claim?
>
> Thanks!


"regular gas can harm Acura's reputation".

But: the computer will tell all. If OBD shows indications of the
"wrong" fuel, Acura can and probably will use that to deny appropriate
warranty claims.
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  #5 (permalink)  
Old 14 Mar 2011, 04:27 pm
John
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Posts: n/a
Default Re: fuel type in new tl w/ sh awd

On Mon, 7 Mar 2011 05:51:52 -0800 (PST), Jim Crugnale
<jcrugnale@amh.org> wrote:

>The manual says that regular gas can harm the engine. Any real
>expert, including Porsche engineers, say that the only reason auto
>manufactures say to use premium fuel is to support the horse power
>rating. If Porsche engineers say you can use regular gas in a
>Porsche, I would think it would be ok in an Acura.
>
>But the phrase "regular gas can harm the engine" - how? Any truth to
>this claim?
>
>Thanks!


I asked that question to the Mercedes salesman that sold me a 500SL
and his answer was that I only don't get the same performance. It will
not damage the engine.
May be they have sensors that Acura doesn't or may be the salesman
doesn't know much about cars.

John
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  #6 (permalink)  
Old 14 Mar 2011, 07:11 pm
pj.chris@verizon.net
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Posts: n/a
Default Re: fuel type in new tl w/ sh awd

On Mon, 14 Mar 2011 17:27:19 -0400, John wrote:

>On Mon, 7 Mar 2011 05:51:52 -0800 (PST), Jim Crugnale
><jcrugnale@amh.org> wrote:
>
>>The manual says that regular gas can harm the engine. Any real
>>expert, including Porsche engineers, say that the only reason auto
>>manufactures say to use premium fuel is to support the horse power
>>rating. If Porsche engineers say you can use regular gas in a
>>Porsche, I would think it would be ok in an Acura.
>>
>>But the phrase "regular gas can harm the engine" - how? Any truth to
>>this claim?
>>
>>Thanks!

>
>I asked that question to the Mercedes salesman that sold me a 500SL
>and his answer was that I only don't get the same performance. It will
>not damage the engine.
>May be they have sensors that Acura doesn't or may be the salesman
>doesn't know much about cars.
>
>John


And if you check their warranty, you will find that running regular on
anything but an emergency basis will void the warranty on the engine.
Their sensors are no better than anybody elses and salesman wouldn't
know detonation and what causes it if he/she tripped over it.
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