180 degree headers WAS:Re: Turbo header design

[Jemison Richard]

I've got a car and a bike (both 4 cyl) with 180 degree cranks.  If you're
interested.

rick

> -----Original Message-----
> From:	Shannen Durphey [SMTP:shannen at grolen.com]
> Sent:	Friday, January 08, 1999 12:38 AM
> To:	diy_efi at efi332.eng.ohio-state.edu
> Subject:	Re: 180 degree headers WAS:Re: Turbo header design
> 
> diy_efi at efi332.eng.ohio-state.edu wrote:
> > 
> > <snipperoo>
> > 
> > >Clarence,
> > >  This is easily done with an inline four having a 1-3-4-2 firing
> order,
> > >as you just pair cyl's 1-4 and 2-3 together.  Commonly done in NA
> > >headers and OEM manifolds too.  However, true 180 degree headers on a
> V8
> > >typically take up a lot of space.
> > >   The only firing order i am familiar with is for a GM engine, which
> is
> > >1-8-4-3-6-5-7-2.  Picture the cyliders as two rows (which they are):
> > >
> > >     1     2        you can see that #1's 180 degree partner is #6,
> #8's
> > >     3     4        is #5, #4's is #7 and #3's is #2.
> > >     5     6
> > >     7     8
> > 
> > #1 and #6 are 180 degrees apart on the distributor, not the crank. #1
> and #4
> > are 180 degrees apart on the crank. Aren't they? What cylinders are
> grouped
> > together with NASCAR 180 degree headers?
> > 
> > Jon
> > 
> > <snip>
> Suppose it would make things easier to include "cam" or "crank". #6
> is  180 cam degrees from #1.  Means that #8 reaches TDC at 630 crank
> degrees.
> 
> Anyone willing to answer some "flat" crank questions off list?
> Shannen