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Primary and Secondary pipes on extractors/headers 

 

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 Post subject: Primary and Secondary pipes on extractors/headers
Posted: Fri Dec 03, 2004 10:59 am 
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With extractors for the 4.0L I6, is it better to have bigger or small primary and secondary pipes? Reason I ask is that there are three I'm currently looking at (won't mention names, but here's the specs):

*A - Primary: 43mm, Secondary 48mm.
*B - Primary: 41mm, Secondary 48mm.
*C - Primary: 38mm, Secondary 44mm.

Or do you have to look at more than just these sizes?

 

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Posted: Fri Dec 03, 2004 12:40 pm 
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from what i have been told a genral street car needs the smaller primaries
while the race cars ie super saloon cars run teh bigger primaries

 

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Posted: Fri Dec 03, 2004 1:32 pm 
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Thats exactly right,

Smaller and more restricted pipes will increase low and mid end torque/power

Longer less restricted pipes will give you less power down low, but increased high end torque, Yes.. for racing.

 

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 Post subject: Re: Primary and Secondary pipes on extractors/headers
Posted: Fri Dec 03, 2004 1:42 pm 
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twr7cx wrote:
Or do you have to look at more than just these sizes?


This is true also. Pipe length (primary and secondary) number of bends, type of bend (mandrel or press), design of header (6-2-1, 6-3-1 etc) are also major factors.

 

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Posted: Fri Dec 03, 2004 5:50 pm 
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Ok, if what Frank said first (and what Slicer backed) is true, then the Pacemaker Compeition headers are the way to go for street driving, as they are C, with the smallest Primaries and Secondaries.
B is the normal Paceies and A is some Genies (I think) that I found on eBay.com.au...

 

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Posted: Sun Dec 05, 2004 11:27 pm 
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JMM race series run a 6-2-1 set up with 35mm primaries at an average of 356mm long and 48mm secondaries at an average of 675mm long just as a comparison. The rule of thumb gas flow at your desired peak RPM should be between 280-300 feet per second

 

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Posted: Mon Dec 06, 2004 3:36 am 
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so the best option over all extractors
would be pacemaker competiton headers right?
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Posted: Mon Dec 06, 2004 10:34 am 
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vsixtyfour wrote:
so the best option over all extractors
would be pacemaker competiton headers right?


No, over all the affordable ones, Pacemakers are the best (especially there competition ones). But then there's other companies like HM, JMM and a few other who also make some, but there's are double the price! Not sure if there better though...

 

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Posted: Mon Dec 06, 2004 11:59 pm 
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With only my JMM's and a slightly bigger cam I actually had more power on the dyno last saturday that a fair few other modded cars running mild cam ie wade 1004 and comparible headers. It all comes down to what TWRXZOIUFLH7 said............Price. I paid $645 for mine in only black finish

 

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Posted: Tue Dec 07, 2004 5:17 pm 
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Jaysen wrote:
With only my JMM's and a slightly bigger cam I actually had more power on the dyno last saturday that a fair few other modded cars running mild cam ie wade 1004 and comparible headers. It all comes down to what TWRXZOIUFLH7 said............Price. I paid $645 for mine in only black finish



wat model jmms did you have and dose any one recomend hpc coating

 

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Posted: Tue Dec 07, 2004 10:39 pm 
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Ive got race series ones, and I wouldnt reconmend HPC coating based on performance, as you wont notice any. It looks good but at such a cost I decided to pass

 

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Posted: Tue Dec 07, 2004 11:36 pm 
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sorry to hijack, but whats a set of pacemakers gonna set me back?
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Posted: Wed Dec 08, 2004 11:35 pm 
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anywhere up to about $550 for the 4480's and $450 for the 4499's

 

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