what year 4.6s... - Page 2

coupe · 06-29-2005, 10:03 PM

Did a '99 GT come with an automatic? If so; then there's a flexplate for 8-bolt cranks. '99 GT's had a "Windsor" 8-bolt crank. Not to be confused with a Cobra crank though...just the GT crank w/ 8-bolt in '99. I cannot think the Mach w/ an automatic would have a different crank than a 5-speed. It's a Cobra engine isn't it?!

I remember when the 96 GT 4.6 came out: weaker than the 5.0, but more responsive to a Vortech. Any mod-motor is a good platform for unnatural-aspiration...just be judicious with boost pressure. And watch out for lean condition on the jug...that's the killer on pistons.

TheJeanyus · 06-29-2005, 10:30 PM

Quote:

Originally Posted by coupe

Did a '99 GT come with an automatic? If so; then there's a flexplate for 8-bolt cranks. '99 GT's had a "Windsor" 8-bolt crank. Not to be confused with a Cobra crank though...just the GT crank w/ 8-bolt in '99. I cannot think the Mach w/ an automatic would have a different crank than a 5-speed.

I'm just telling you what I've read - and I've read it in quite a few different places.

Quote:

It's a Cobra engine isn't it?!

No. The heads, cams, and intake are all unique to the Mach 1.

Italian LX · 06-29-2005, 11:12 PM

Quote:

Originally Posted by coupe

I cannot think the Mach w/ an automatic would have a different crank than a 5-speed. It's a Cobra engine isn't it?!

Think what you like... but it's true; the automatic Machs have a 6-bolt cast crank.

coupe · 06-29-2005, 11:50 PM

Good Grief!!! I read about it. What a disaster.

And it's got a 99 Cobra intake, 5.4L truck intake cams, and one-off exhaust cams.

QWKSNKE · 06-30-2005, 06:41 AM

Quote:

Originally Posted by coupe

Did a '99 GT come with an automatic? If so; then there's a flexplate for 8-bolt cranks. '99 GT's had a "Windsor" 8-bolt crank. Not to be confused with a Cobra crank though...just the GT crank w/ 8-bolt in '99. I cannot think the Mach w/ an automatic would have a different crank than a 5-speed. It's a Cobra engine isn't it?!

I would be willing to bet that the 'windsors' were not automatic

joker · 06-30-2005, 07:36 AM

Yep, the mach autos had a cast crank. I didnt know about the compression ratio being higher.

I have heard of early failures in supercharged gt's as well. Comes down to the tune really.

EZ SPEED · 06-30-2005, 10:03 AM

Quote:

Originally Posted by joker

Yep, the mach autos had a cast crank. I didnt know about the compression ratio being higher.

I have heard of early failures in supercharged gt's as well. Comes down to the tune really.

True about the cranks and the compression.

Evil_Capri · 06-30-2005, 10:47 AM

Most people running superchargers on Mach's seem to be fine running a good tune and anything under 9-10psi. From the research I've done on M1R, and some other sites.

Sendero · 06-30-2005, 11:58 AM

Quote:

Originally Posted by TheJeanyus

No. The heads, cams, and intake are all unique to the Mach 1.

Huh?

Heads are the rectangular style DOHC's (like the Navi's), Intake is the 99-01 Cobra piece, Cams are Navigator intake and 99-01 Exhaust.

Italian LX · 06-30-2005, 12:02 PM

Quote:

Originally Posted by TheJeanyus

No. The heads, cams, and intake are all unique to the Mach 1.

Quote:

Originally Posted by coupe

And it's got a 99 Cobra intake, 5.4L truck intake cams, and one-off exhaust cams.

Quote:

Originally Posted by Sendero

Heads are the rectangular style DOHC's (like the Navi's), Intake is the 99-01 Cobra piece, Cams are Navigator intake and 99-01 Exhaust.

Let's see if we can get a few more guesses in here... sooner or later someone's bound to get it right.

06-29-2005, 10:03 PM	#11
coupe Super Moderator Join Date: Dec 2004 Posts: 6,313	Re: what year 4.6s... Did a '99 GT come with an automatic? If so; then there's a flexplate for 8-bolt cranks. '99 GT's had a "Windsor" 8-bolt crank. Not to be confused with a Cobra crank though...just the GT crank w/ 8-bolt in '99. I cannot think the Mach w/ an automatic would have a different crank than a 5-speed. It's a Cobra engine isn't it?! I remember when the 96 GT 4.6 came out: weaker than the 5.0, but more responsive to a Vortech. Any mod-motor is a good platform for unnatural-aspiration...just be judicious with boost pressure. And watch out for lean condition on the jug...that's the killer on pistons. __________________ " If you can't explain it simply, you don't understand it well enough. " - Albert Einstein

06-29-2005, 11:50 PM	#14
coupe Super Moderator Join Date: Dec 2004 Posts: 6,313	Re: what year 4.6s... Good Grief!!! I read about it. What a disaster. And it's got a 99 Cobra intake, 5.4L truck intake cams, and one-off exhaust cams. __________________ " If you can't explain it simply, you don't understand it well enough. " - Albert Einstein

06-30-2005, 07:36 AM	#16
joker Friends Join Date: Dec 2004 Location: Southern Colorado Posts: 2,452	Re: what year 4.6s... Yep, the mach autos had a cast crank. I didnt know about the compression ratio being higher. I have heard of early failures in supercharged gt's as well. Comes down to the tune really.

06-30-2005, 10:47 AM	#18
Evil_Capri Senior Member Join Date: Mar 2005 Location: Cincinnati, OH Posts: 149	Re: what year 4.6s... Most people running superchargers on Mach's seem to be fine running a good tune and anything under 9-10psi. From the research I've done on M1R, and some other sites.