[DeTomaso] [Fwd: Re: automotive related questions!]

Dave Londry davel at emspace.com
Wed Dec 10 17:42:47 EST 2008


720/8 = 180 ??

asajay at asajay.com wrote:
> 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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