[DeTomaso] Compression ratio estimate

[Larry - Ohio Time Corp]

<<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