[DeTomaso] Header mock-up

Ken Green kenn_green at yahoo.com
Thu Sep 26 14:00:04 EDT 2019 

 I recently was told, but didn't confirm, that equal length headers only have a benefit if the lengths are very accurate.  I don't recall the reasoning, but I assume it has something to do with the lengths of the pulses in each tube and and how they combine in the collector?    This theory may be based on an inaccurate understanding?
Tri-Y headers seem to be popular in NASCAR, not sure why.  Maybe they better cobmine the tubes that are closest to 180 degrees apart.
Did Dan Jones ever look at headers in his engine build comparisons?

Ken

    On Thursday, September 26, 2019, 9:46:11 AM PDT, Corey Price <coreyjprice at gmail.com> wrote:  
 
 Mike,

Unfortunately the vendor who is selling the coyote headers came out with them after I bought my header fab parts and so here I am. The cost of their headers is astronomical too. I have pictures of them so I can kinda see what they are doing. I can TIG weld and fabricate, so I'll just do my own thing here. 

I also like being able to choose my own collector, materials, primary diameter, flanges, V-band connectors, etc. 

I'll be working on the layout to get a bit better equal length primaries as I stated. I was aware of the forward bends. This pic was just a proof in concept of a mock-up using PVC pipe. 

Corey

> On Sep 26, 2019, at 9:20 AM, Mike Drew <MikeLDrew at aol.com> wrote:
> 
> Yes, do you have a set of standard (NOT stock) Pantera headers you can emulate? Like Hall headers?
> 
> They typically have quite a bit more vertical height to accommodate the forward bends necessary to achieve equal length. Typically the pipe emanating from the rearmost cylinder initially turns forward, before then turning 180 degrees to the rear. This dictates a certain amount of vertical height so the bends aren’t impossibly sharp. 
> 
> I know there are several other Panteras already running Coyote engines. Somebody is producing headers for them. Why not just get a set of those? You have so much other work that needs doing, I think this problem is best solved with a credit card! :)
> 
> Mike
> 
> 
> 
> Sent from my iPad
> 
>> On Sep 26, 2019, at 08:06, Mirril McMullen <mirrilm at earthlink.net> wrote:
>> 
>> Nice!
>> 
>> For bonus points can you try making them equal length?
>> 
>> /\/\
>> 
>> 74L 6859 WAYBAC
>> 
>> -----Original Message-----
>> From: DeTomaso [mailto:detomaso-bounces at server.detomasolist.com] On Behalf
>> Of Corey Price
>> Sent: Thursday, September 26, 2019 10:29 AM
>> To: Detomaso List
>> Subject: [DeTomaso] Header mock-up
>> 
>> I'm putting a Coyote in my Pantera, and fabricating my own headers. I'm
>> using PVC to mock it up. I'll work on it more to see if I can get a little
>> more equal length design, but I thought I'd share.
>> 
>> Corey
>> 
>> 
>> 
>> _______________________________________________
>> 
>> 
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> 
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-------------- next part --------------
   I recently was told, but didn't confirm, that equal length headers only
   have a benefit if the lengths are very accurate.  I don't recall the
   reasoning, but I assume it has something to do with the lengths of the
   pulses in each tube and and how they combine in the collector?    This
   theory may be based on an inaccurate understanding?
   Tri-Y headers seem to be popular in NASCAR, not sure why.  Maybe they
   better cobmine the tubes that are closest to 180 degrees apart.
   Did Dan Jones ever look at headers in his engine build comparisons?
   Ken

   On Thursday, September 26, 2019, 9:46:11 AM PDT, Corey Price
   <coreyjprice at gmail.com> wrote:
   Mike,
   Unfortunately the vendor who is selling the coyote headers came out
   with them after I bought my header fab parts and so here I am. The cost
   of their headers is astronomical too. I have pictures of them so I can
   kinda see what they are doing. I can TIG weld and fabricate, so I'll
   just do my own thing here.
   I also like being able to choose my own collector, materials, primary
   diameter, flanges, V-band connectors, etc.
   I'll be working on the layout to get a bit better equal length
   primaries as I stated. I was aware of the forward bends. This pic was
   just a proof in concept of a mock-up using PVC pipe.
   Corey
   > On Sep 26, 2019, at 9:20 AM, Mike Drew <[1]MikeLDrew at aol.com> wrote:
   >
   > i>>?Yes, do you have a set of standard (NOT stock) Pantera headers
   you can emulate? Like Hall headers?
   >
   > They typically have quite a bit more vertical height to accommodate
   the forward bends necessary to achieve equal length. Typically the pipe
   emanating from the rearmost cylinder initially turns forward, before
   then turning 180 degrees to the rear. This dictates a certain amount of
   vertical height so the bends arenat impossibly sharp.
   >
   > I know there are several other Panteras already running Coyote
   engines. Somebody is producing headers for them. Why not just get a set
   of those? You have so much other work that needs doing, I think this
   problem is best solved with a credit card! :)
   >
   > Mike
   >
   >
   >
   > Sent from my iPad
   >
   >> On Sep 26, 2019, at 08:06, Mirril McMullen
   <[2]mirrilm at earthlink.net> wrote:
   >>
   >> Nice!
   >>
   >> For bonus points can you try making them equal length?
   >>
   >> /\/\
   >>
   >> 74L 6859 WAYBAC
   >>
   >> -----Original Message-----
   >> From: DeTomaso [mailto:[3]detomaso-bounces at server.detomasolist.com]
   On Behalf
   >> Of Corey Price
   >> Sent: Thursday, September 26, 2019 10:29 AM
   >> To: Detomaso List
   >> Subject: [DeTomaso] Header mock-up
   >>
   >> I'm putting a Coyote in my Pantera, and fabricating my own headers.
   I'm
   >> using PVC to mock it up. I'll work on it more to see if I can get a
   little
   >> more equal length design, but I thought I'd share.
   >>
   >> Corey
   >>
   >>
   >>
   >> _______________________________________________
   >>
   >>
   >> Detomaso Email List is not managed by POCA
   >> Posted emails must not exceed 1.5 Megabytes
   >> DeTomaso mailing list
   >> [4]DeTomaso at server.detomasolist.com
   >> [5]http://server.detomasolist.com/mailman/listinfo/detomaso
   >>
   >> To manage your subscription (change email address, unsubscribe,
   etc.) use the links above.
   >>
   >> Members who post to this list grant license to the list to forward
   any message posted here to all past, current, or future members of the
   list. They also grant the list owner permission to maintain an archive
   or approve the archiving of list messages.
   >
   _______________________________________________
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References

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   2. mailto:mirrilm at earthlink.net
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   5. http://server.detomasolist.com/mailman/listinfo/detomaso
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