[DeTomaso] Cross over exhaust tube?

[GW]

Sometimes screwing things up can really teach you a lot. I have posted 
these before but when I built these headers they were a screw up.

http://www.rc-tech.net/cars2/ts/d2.jpg

Engine run showed a huge difference cylinder to cylinder directly 
related to collector sequence. Collector sequence was primaries 2 into 
one then secondaries 2 into 1.

Miss match of firing order in primaries 2 into one caused a HUGE discrepancy
Difference in egt's directly related to firing order and collector sequence:
http://www.rc-tech.net/cars2/panttransam/1905/ex/run%20dec8%202008%20.jpg

Miss match in secondary sequence undetectable!!

So here would be my assessment; not fact but belief from what I have seen.

-Unless you use 180's you can not match cylinder to cylinder per firing 
order
-Once collected into 4, any gains you have to equalizing pressure would 
be minimal and probably un detectable and may not exceed the normal 
differences which already exist

I certainly don't believe it would harm anything, but I don't see any 
measurable gains.

Gary


A set of 180's where cylinders are matched



Tom Borcich wrote:
> Check this out....interesting.
> http://www.pim.net/42206RR30.jpg
>
> I've not see a cross over tube on the exhaust of a Pantera...is there any benefit?
>  
> Tom
>  		 	   		  
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