[DeTomaso] headers

Daniel C Jones daniel.c.jones2 at gmail.com
Mon Jan 7 19:05:35 EST 2019


>  IIRC, the Euro GTS headers-exhaust were considered the best although
they lost a reported 50 hp

It was the ANSA muflers that lost the 50 HP (compared to both Magnaflow
mufflers and open headers.  Surprisingly, the GTS headers weren't too bad
on peak power but gave up a bunch of peak torque (25 to 35 ft-lbs depending
upon the engine combination) due to the short primary and collector
lengths.  That's compared to a conventional Mustang long tube 4-into-1
headers with 1 3/4" diameter primaries and 3" diameter collectors.

> I need to purchase a new set for a 4v.  Tri wye or big bore.

The Euro GTS headers aren't really tri-y headers.  They are just 4-into-1
headers with a short tri-y collector.  They have primaries that are too big
and a collector that is too small but, in our testing, performed a little
better than the other 4-into-1 shorty headers we tested with (also too
short) conventional collectors.  Note that we did not test the Mind Train
4-into-1 headers.  I'd stay away from the Hall big bore which had the worst
collector.

I believe a real 4-2-1 tri-y full length header would gain back that peak
torque without sacrificing the peak power.  I've got a design that looks
like it will fit the Pantera chassis and something I think I can use to
test the concept on the dyno but when I'll  find the time to complete the
project is unknown.

> I have heard a handful of anecdotal stories of problems with Wilkinson’s
system

Those were the best of the off-the-shelf Pantera exhaust systems we tested
due primarily to the mufflers working much better than the original ANSA
units.  Kelly Coffield's custom stepped 180s were probably the best Pantera
exhaust we tested:


http://www.the351cforum.com/download/file.php?id=145&sid=28f9f95e76a6e46cbf253c192d9c2e26&mode=view

Note the small ID collector works on the 180s because no adjacent firing
pulses are paired together in the same collector.  The of-the-shelf Pantera
180s I've seen have had way to large of a collector.

> I have a pair of headers for 2v heads is someone needs them.

I've been slowly gathering 2V parts to test on the dyno.  If no one snags
them, I might have a use for them once the new dyno 390C is built.

Dan Jones
-------------- next part --------------
   >A  IIRC, the Euro GTS headers-exhaust were considered the best
   although they lost a reported 50 hp
   It was the ANSA muflers that lost the 50 HP (compared to both Magnaflow
   mufflers and open headers.A  Surprisingly, the GTS headers weren't too
   bad on peak power but gave up a bunch of peak torque (25 to 35 ft-lbs
   depending upon the engine combination) due to the short primary and
   collector lengths.A  That's compared to a conventional Mustang long
   tube 4-into-1 headers with 1 3/4" diameter primaries and 3" diameter
   collectors.
   > I need to purchase a new set for a 4v.A  Tri wye or big bore.
   The Euro GTS headers aren't really tri-y headers.A  They are just
   4-into-1 headers with a short tri-y collector.A  They have primaries
   that are too big and a collector that is too small but, in our testing,
   performed a little better than the other 4-into-1 shorty headers we
   tested with (also too short) conventional collectors.A  Note that we
   did not test the Mind Train 4-into-1 headers.A  I'd stay away from the
   Hall big bore which had the worst collector.
   I believe a real 4-2-1 tri-y full length header would gain back that
   peak torque without sacrificing the peak power.A  I've got a design
   that looks like it will fit the Pantera chassis and something I think I
   can use to test the concept on the dyno but when I'llA  find the time
   to complete the project is unknown.
   > I have heard a handful of anecdotal stories of problems with
   Wilkinsonas system
   Those were the best of the off-the-shelf Pantera exhaust systems we
   tested due primarily to the mufflers working much better than the
   original ANSA units.A  Kelly Coffield's custom stepped 180s were
   probably the best Pantera exhaust we tested:
   A [1]http://www.the351cforum.com/download/file.php?id=145&sid=28f9f95e7
   6a6e46cbf253c192d9c2e26&mode=view
   A
   Note the small ID collector works on the 180s because no adjacent
   firing pulses are paired together in the same collector.A  The
   of-the-shelf Pantera 180s I've seen have had way to large of a
   collector.
   > I have a pair of headers for 2v heads is someone needs them.
   I've been slowly gathering 2V parts to test on the dyno.A  If no one
   snags them, I might have a use for them once the new dyno 390C is
   built.A
   Dan Jones

References

   1. http://www.the351cforum.com/download/file.php?id=145&sid=28f9f95e76a6e46cbf253c192d9c2e26&mode=view


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