[DeTomaso] Compression ratio estimate

[michael@michaelshortt.com]

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-p174.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