[DeTomaso] automotive related questions!

[asajay at asajay.com]

It takes two revolutions to complete four strokes for all eight  
cylinders, yes.  Each cylinder must make four strokes:  Intake (piston  
goes down), compression (piston goes up), ignition (piston goes down),  
exhaust (piston goes up).  So you see, exhaust only happens every  
-other- time the piston comes up, so the crank has to make two  
revolutions to complete one cycle.

:)

Asa Jay

Quoting Dave Londry <davel at emspace.com>:

> 8 cyl every 2 revs or 720 degrees??
> dave
>
> Paul - Home wrote:
>> I have a few guesses and they are only guesses because the standard
>> Chevy firing order also supports crossing the banks to get 180 degree
>> headers.
>>
>> 1. It didn't fit well in the body work
>> 2. They just didn't care to optimize that closely
>> 3. They were running a flat crank which doesn't need to cross banks.
>>
>> For reference they are called 180 degree headers because each exhaust
>> pipe will output once every 180 degrees of crank rotation.
>>
>> Paul
>> #9270
>>
>> michael frazier wrote:
>>
>>> Thanks for the info.  Any response on the 2nd question?
>>>
>>> Michael...it was in the 30s last night and the 50s today.  Looking  
>>>  for a winter project since it's too cold to go outside.
>>>
>>> (2nd question: After looking at photos of GT-40s, Lolas, McLarens,  
>>>  Chapparals, etc, I noticed the Ford poweredvehicles used 180s   
>>> while the Chevy powered ones did not (generally). Any thoughts   
>>> about that? Boat type headers?
>>> I asked about building a set of Pantera headers like that awhile   
>>> back. You could run longer tubes, a crossover pipe,
>>> less connectors and simpler build while still getting the zoomy   
>>> racy look for those who go just for that. Any thoughts on that one?)
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>
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