Stroker GTs? - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

smavid · 07-19-2002, 06:28

i was just thinking, they might stroke the 5.4 out to 5.8 for the GT, or GTHO.....

does anyone know if that might be an actual possibility?

hmmmm DOHC 351 BA GT

FM · 07-19-2002, 06:35

5.4 is a stroked 4.6... Can't see a 5.8 happening myself...

smavid · 07-19-2002, 06:50

hmm yeah i was thinking the bottom of the piston might be a bit too close to the bottom of the cylinder already with 5.4 so stroking further might not be possible (i'v never even heard of a stroker kit for 4.6 mustang engines larger than 5.2, let alone 5.4)

then again, i dont really know the bore/stroke of the mustang engine so i cant really say. maybe a bit of boring could get it to 5.8

ChuBBz · 07-19-2002, 06:57

Theres chance of a Supercharger.....
i mean....... it HAS to be the most powerful production car to come out of australia for it to really make its mark. Otherwise they'll just be playing catch up (as usual)
Im sure GP's got something up his selves.

Cobra · 07-19-2002, 10:18

So the 5.4L we are getting is just a stroked All-Alloy 4.6L from the mustang? Is this the same engine as was seen in the GT40 concept?

mkoesel · 07-19-2002, 11:13

Quote:

[QB]
i was just thinking, they might stroke the 5.4 out to 5.8 for the GT, or GTHO.....

does anyone know if that might be an actual possibility?

hmmmm DOHC 351 BA GT
[/QB]

The 5.4L already has a very undersquare bore geomery. The
stroke is over 100cm. Stroking it would increase piston speed
beyond what is reliable.

Quote:

[QB]
then again, i dont really know the bore/stroke of the mustang engine so i cant really say. maybe a bit of boring could get it to 5.8
[/QB]

Both the 4.6 and 5.4 have a 3.552 in. bore. The stroke of the
4.6 is 3.5433 in. and the stroke of the 5.4 is 4.165 in.

There are no stroker kits for the 5.4 and all stroker kits for the
4.6 use a stroke smaller than the 5.4 stroke.

The largest modular I have heard of is 5.9L (so yes you can get
to 5.8L). But, this was built out of an Aluminum 4.6L block bored
to 3.7 in. and actually used a 5.4L crank, machined quite a bit,
and used very short rods. Not suitable for production, but its an
interesting setup.

The 5.4L block cannot be bored because there is no Aluminum
version (yet

). The iron block cannot be bored because there is
not enough material used in the casting around the cylindar
walls. Aluminum blocks use thicker walls because the aluminum
is not as rigid as iron. Soon, there will be an Aluminum 5.4L
block -- in the upcoming GT 40. No word yet whether it will be
limited to this motor only, or will be used in other 5.4L motors
later. But, if it does, then you could theoretically bore this block
to 3.7 in. and get 5.9L, just as in the motor above, but you would
be able to do so with the stock rod length. But I don't expect a
setup like this from Ford anytime soon (if ever). It will probably
be something for the aftermarket, just as the bored 4.6L motors
are today.

Quote:

[QB]
So the 5.4L we are getting is just a stroked All-Alloy 4.6L from the mustang? Is this the same engine as was seen in the GT40 concept?
[/QB]

There are three supercharged modular motors in use in the US:

The new Cobra uses a 4.6L 4V at 390hp/390lb-ft
The Lightning truck uses a 5.4L 2V at 380hp/450lb-ft
The upcoming GT40 uses a 5.4L 4V at 500hp/500lb-ft

If they use any of these in your Falcon GT, it will probably be
be a 3V version of the Lightning motor. This would probably
make over 400hp no problem.

Another possibility (as I've heard rumored a lot) is a non-
supercharged 5.4L 4V. This is what I would like to see. It would
probably be similar to the very limited (300 units) 5.4L 4V motor
used in the 2000 Cobra R in the US. This motor was rated at
385hp and 385lb-ft, but many of the cars make over 400 on the
dyno.

clintsimau · 07-19-2002, 18:38

What im told Ford are going to stay away from the Supercharging and keep to the original force fed application (Turbo's)

Which is good otherwise they can be admitted to following in Holdens traits which we Ford men NEVER want!
I believe the 5.4 stroker is much faster and produces more than enough power that a 351, the 5.4 is a rev motor with alot of torque just like the 4.1 (250 Xflow) it has alot of torque!

Although it would be great to see the 351 in the GTHO again, especially when you can buy one and then after market bore it to a 383, or even a 400!!! which wouldnt be bad either!! :)

FM · 07-19-2002, 19:21

Quote:

Originally posted by Cobra
So the 5.4L we are getting is just a stroked All-Alloy 4.6L from the mustang? Is this the same engine as was seen in the GT40 concept?

I doubt we'll see an alloy block for Barra. Either way it doesn't fuss me. As long as the horsepower & relaibility are there I'll be a happy chappy..

Cobra · 07-21-2002, 01:24

Ohh, I was under the Impression that our V8s were to be All-Alloy? Like you though I don't really care as long as the power and reliability is there.

MADNC_8 · 07-21-2002, 05:40

i was sure it was all alloy too but yeah reliability is the main thing hey and besides in a few years if we really want the alloy donk we can allways go buy one and fit it in hey!!!