[DeTomaso] Compression ratio estimate

Tue Aug 13 14:13:06 EDT 2013

I know that the powder used in reloading ammo is not classified as an explosive, and I assume there is some technical definition based on burn rate.  When selecting a powder you may want a fast powder for a target load, or a slower powder to maximize energy.  The difference may be in micro (or nano) seconds, but there is a very real difference in the outcome.

Ken

________________________________
From: Boyd Casey <boyd411 at gmail.com>
To: Melanie Disco <michael at michaelshortt.com> 
Cc: Jack Donahue <demongusta at me.com>; "detomaso at poca.com" <detomaso at poca.com> 
Sent: Tuesday, August 13, 2013 9:40 AM
Subject: Re: [DeTomaso] Compression ratio estimate

No need to explode about it! LOL

On Tue, Aug 13, 2013 at 8:40 AM, michael at michaelshortt.com <
michaelsavga at gmail.com> wrote:

> I don't think that this is worth a semantics discussion Larry, you know
> what I meant.
>
> The official definition ( of 12 offered, this #1) is.
> ex·plode  (k-spld)v. ex·plod·ed, ex·plod·ing, ex·plodesv.intr.
>
> 1. To release mechanical, chemical, or nuclear energy by the sudden
> production of gases in a confined space:
>
> Whether ignited by a spark or by pressure (as in a diesel), the fuel indeed
> explodes and that explosion is what drives the piston down. IMHO,"burn"
> does not fully convey the mechanical reaction which occurs. Merely burning
> fuel doesn't have the same word power or descriptive power of the
> intensity, especially when put in the content of a Formula One engine which
> at 18,000 revolutions per minute caused by 144,000 little explosions.
> Perhaps in an Isetta, but in an 8,000 hp funny car, my Pantera and even my
> weed wacker, I can hear these very rapid "explosions" which are caused by
> fuel being burned in a sudden manner in a confined space = definition.
>
> Michael
> On Aug 13, 2013 8:21 AM, "Larry - Ohio Time Corp" <larry at ohiotimecorp.com>
> wrote:
>
> > <<lower octane fuel will explode more easily.>>
> >
> >
> > I am not happy with the word Explode. There are no explosions in a motor.
> > It
> > is a very rapid burn. The same thing is true when you shoot a gun. There
> is
> > no explosion, but a very rapid burn.
> >
> >
> > Larry (details) - Cleveland
> >
> >
> >
> >
> > -----Original Message-----
> > From: detomaso-bounces at poca.com [mailto:detomaso-bounces at poca.com] On
> > Behalf
> > Of michael at michaelshortt.com
> > Sent: Monday, August 12, 2013 11:19 PM
> > To: Jack Donahue
> > Cc: detomaso at poca.com
> > Subject: Re: [DeTomaso] Compression ratio estimate
> >
> > The more squishy it gets, the higher the compression.
> >
> > This is the volume is 64 at the bottom and 8 at the top, the comp ratio
> is
> > 8:1
> >
> > But if the bottom volume is 120 and the top volume is 10, the comp ration
> > is
> > 12:1
> >
> > The reason that higher comp engines need prem fuel is that it is less
> > volatile, meaning that it takes more to set it off, where, lower octane
> > fuel
> > will explode more easily.
> >
> > Dieseling is a byproduct of fuel being set off by pressure rather than by
> > spark, so you want fuel that reacts more to spark and less to pressure, a
> > diesel engine doesn't even use a spark, all the fuel is exploded by
> > pressure
> > after the first reaction that is helped alone by the glow plug to get it
> > started.
> >
> >
> > Michael
> >
> >
> >
> > On Mon, Aug 12, 2013 at 11:10 PM, michael at michaelshortt.com
> > <michaelsavga at gmail.com> wrote:
> > > It is the difference in volume of the cylinder space at the bottom of
> > > the stroke and between the volume at the top of the stroke.
> > >
> > >
> > > Michael Shortt
> > >
> > > On Mon, Aug 12, 2013 at 11:02 PM, Jack Donahue <demongusta at me.com>
> > wrote:
> > >> Could someone DEFINE "compression ratio"?
> > >> On Aug 12, 2013, at 6:33 AM, Jeff Detrich wrote:
> > >>
> > >>> http://store.katechengines.com/whistler-compression-ratio-tester-p17
> > >>> 4.aspx
> > >>>
> > >>> Maybe find a shop with one of these?
> > >>>
> > >>> Jeff
> > >>> 6559
> > >>>
> > >>>
> > >>> On Sun, Aug 11, 2013 at 10:02 PM, Boyd Casey <boyd411 at gmail.com>
> > wrote:
> > >>>
> > >>>> Dear fellow Panteraians,
> > >>>> I have a question for the more technically savvy . Is it possible
> > >>>> to come up with an estimate of your pistons compression ratio by
> > >>>> measuring the cylinder compression? As I have mentioned before I
> > >>>> bought my car from the estate of a gear head who owned several auto
> > >>>> parts stores and he spent allot of money on my Pantera when it was
> > >>>> his. He was apparently a fan of Hall Pantera because allot of the
> > >>>> Pantera goodies he bought appear to be Halls ( and there were lots
> > >>>> of Hall literature and parts lists) The engine has roller rockers
> > >>>> and Hall big bore headers and an in unidentified cam. Since I have
> > >>>> not been inside the engine ( and don't want to until I need too) I
> > >>>> am trying to find out as much as I can and if there are any
> > >>>> forensic techniques for coming up with an educated guess as to the
> > >>>> engine components I would appreciate hearing about them.
> > >>>> Boyd
> > >>>> _______________________________________________
> > >>>>
> > >>>> Detomaso Forum Managed by POCA
> > >>>>
> > >>>> DeTomaso mailing list
> > >>>> DeTomaso at poca.com
> > >>>> http://poca.com/mailman/listinfo/detomaso
> > >>>>
> > >>> _______________________________________________
> > >>>
> > >>> Detomaso Forum Managed by POCA
> > >>>
> > >>> DeTomaso mailing list
> > >>> DeTomaso at poca.com
> > >>> http://poca.com/mailman/listinfo/detomaso
> > >>
> > >> _______________________________________________
> > >>
> > >> Detomaso Forum Managed by POCA
> > >>
> > >> DeTomaso mailing list
> > >> DeTomaso at poca.com
> > >> http://poca.com/mailman/listinfo/detomaso
> > >
> > >
> > >
> > > --
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Michael L. Shortt
> > > Savannah, Georgia
> > > www.michaelshortt.com
> > > michael at michaelshortt.com
> > > 912-232-9390
> > >
> > >
> > > This email is protected by the Electronic Communications Privacy Act,
> > > 18 U.S.C. Sec. 2510-2521, is confidential and may be legally
> > > privileged.  If you are not the intended recipient, you are hereby
> > > notified that any retention, dissemination, distribution or copying of
> > > this communication is strictly prohibited.  Please reply to the sender
> > > that you have received this message in error, then delete it.  Thank
> > > you
> >
> >
> >
> > --
> >
> >
> >
> >
> >
> >
> >
> > Michael L. Shortt
> > Savannah, Georgia
> > www.michaelshortt.com
> > michael at michaelshortt.com
> > 912-232-9390
> >
> >
> > This email is protected by the Electronic Communications Privacy Act, 18
> > U.S.C. Sec. 2510-2521, is confidential and may be legally privileged.  If
> > you are not the intended recipient, you are hereby notified that any
> > retention, dissemination, distribution or copying of this communication
> is
> > strictly prohibited.  Please reply to the sender that you have received
> > this
> > message in error, then delete it.  Thank you
> > _______________________________________________
> >
> > Detomaso Forum Managed by POCA
> >
> > DeTomaso mailing list
> > DeTomaso at poca.com
> > http://poca.com/mailman/listinfo/detomaso
> >
> >
> _______________________________________________
>
> Detomaso Forum Managed by POCA
>
> DeTomaso mailing list
> DeTomaso at poca.com
> http://poca.com/mailman/listinfo/detomaso
>
_______________________________________________

Detomaso Forum Managed by POCA

DeTomaso mailing list
DeTomaso at poca.com
http://poca.com/mailman/listinfo/detomaso