[DeTomaso] Pictures

[Daniel C Jones]

I have a couple of magazine articles on the Pantera Si from the 1991
timeframe.  Both are powered by 5.0L HO EFI engines but one is fitted with
the HO intake and one is fitted with a tubular GT-40 intake manifold.   The
one with HO intake lists the engine as

 305 bhp @ 5800 RPM
 333 lb-ft @ 3700 RPM
 11:1 compression

A stock 5.0L HO would have been rated at 225 HP @ 4200 RPM and 300 lb-ft @
3200 RPM with a 9.0:1 compression ratio and mass air EFI.  The article
mentions a different cam and pistons (required to get the 11:1 compression
ratio) along with larger valves for the heads (which would have been E7TE
truck heads unless they were swapped) and intake work.  Before the GT40
intake became available it was common to extrude hone or cut apart, hand
port and re-weld the HO intake.  The article which shows the GT40 tubular
intake quotes the same power and torque figures.  Presumably they switched
to the Ford Motorsport GT40 parts rather than continue re-working the HO
parts.  In the same timeframe, Ford sold an emissions legal "GT-40 Street
Legal Parts" kit rated at 270 HP using the SAE J1349 gross HP standard.
That kit consisted of the cast aluminum Cobra version of the tubular GT40
intake, cast iron GT40 heads, 1.6:1 rolller rockers, 65mm throttle body 24
lb/hr injectors, fuel pump, stainless steel tubular shorty headers and
underdrive pulleys.  A similar "GT40 Street Heat" kit was sold with 1.7:1
roller rockers and rated at 295 HP.  Essentially the same parts were used
on the 1993 Mustang Cobra but with a milder cam and rated at 235 HP net,
though the HO had dropped to 205 HP.  The 20 HP drop of the ase HO has been
attributed to a milder version of the HO, mass air (more restrictive than
the earlier speed density) and a revised SAE net HP test.

Dan Jones

On Tue, Oct 13, 2015 at 1:44 AM, Charles McCall <charlesmccall at gmail.com>
wrote:

>    All the Pantera SI's received the 5.0 motor as shown in the photo. I've
>    seen a bunch and they all have the same intake. They also have the same
>    tubular rear. They made just over 300hp if I remember correctly. I've
>    driven a couple and that figure would be about right.
>    A
>    Of the 4 Si targas, 2 had Getrag 6-speeds as opposed to ZF's. The
>    yellow one was one of them.
>    A
>    The Factory switched from 351C to 351W sometime around 1987 in the
>    GT5-S production. Then for the Si they switched to the 5.0
>
>
>
>
-------------- next part --------------
   I have a couple of magazine articles on the Pantera Si from the 1991
   timeframe.A  Both are powered by 5.0L HO EFI engines but one is fitted
   with the HO intake and one is fitted with a tubular GT-40 intake
   manifold.A A  The one with HO intake lists the engine as
   A 305 bhp @ 5800 RPM
   A 333 lb-ft @ 3700 RPM
   A 11:1 compression
   A stock 5.0L HO would have been rated at 225 HP @ 4200 RPM and 300
   lb-ft @ 3200 RPM with a 9.0:1 compression ratio and mass air EFI.A  The
   article mentions a different cam and pistons (required to get the 11:1
   compression ratio) along with larger valves for the heads (which would
   have been E7TE truck heads unless they were swapped) and intake work.A
   Before the GT40 intake became available it was common to extrude hone
   or cut apart, hand port and re-weld the HO intake.A  The article which
   shows the GT40 tubular intake quotes the same power and torque
   figures.A  Presumably they switched to the Ford Motorsport GT40 parts
   rather than continue re-working the HO parts.A  In the same timeframe,
   Ford sold an emissions legal "GT-40 Street Legal Parts" kit rated at
   270 HP using the SAE J1349 gross HP standard.A  That kit consisted of
   the cast aluminum Cobra version of the tubular GT40 intake, cast iron
   GT40 heads, 1.6:1 rolller rockers, 65mm throttle body 24 lb/hr
   injectors, fuel pump, stainless steel tubular shorty headers and
   underdrive pulleys.A  A similar "GT40 Street Heat" kit was sold with
   1.7:1 roller rockers and rated at 295 HP.A  Essentially the same parts
   were used on the 1993 Mustang Cobra but with a milder cam and rated at
   235 HP net, though the HO had dropped to 205 HP.A  The 20 HP drop of
   the ase HO has been attributed to a milder version of the HO, mass air
   (more restrictive than the earlier speed density) and a revised SAE net
   HP test.
   Dan Jones
   On Tue, Oct 13, 2015 at 1:44 AM, Charles McCall
   <[1]charlesmccall at gmail.com> wrote:

     A  A All the Pantera SI's received the 5.0 motor as shown in the
     photo. I've
     A  A seen a bunch and they all have the same intake. They also have
     the same
     A  A tubular rear. They made just over 300hp if I remember
     correctly. I've
     A  A driven a couple and that figure would be about right.
     A  A A
     A  A Of the 4 Si targas, 2 had Getrag 6-speeds as opposed to ZF's.
     The
     A  A yellow one was one of them.
     A  A A
     A  A The Factory switched from 351C to 351W sometime around 1987 in
     the
     A  A GT5-S production. Then for the Si they switched to the 5.0
     A

References

   1. mailto:charlesmccall at gmail.com