Jay Leno's Take on the 426 Street Hemi

[Fleet 500]

This is fun to watch. A 1970 440 Dodge Challenger VS a 2007 Dodge Charger SRT-8...
1970 Challenger 440 vs. 2007 Charger SRT-8 - Video

[Matra et Alpine]

Originally Posted by Fleet 500

This is fun to watch. A 1970 440 Dodge Challenger VS a 2007 Dodge Charger SRT-8...
1970 Challenger 440 vs. 2007 Charger SRT-8 - Video

Loved the sound .... BUT .... what's the point ?
A heavily modified 70s car versus a lightly modified modern.
What rubber are they runnung ?
Wonder how many ACTUAL mods ? lightened perhaps ?
Please, Fleet, if you want to post these try to be balanced and recognise that your reputation means it raises objections

[Fleet 500]

Originally Posted by Matra et Alpine

Loved the sound .... BUT .... what's the point ?
A heavily modified 70s car versus a lightly modified modern.
What rubber are they runnung ?
Wonder how many ACTUAL mods ? lightened perhaps ?
Please, Fleet, if you want to post these try to be balanced and recognise that your reputation means it raises objections

I wouldn't call mild head porting heavily modified.

As you said, more info should have been mentioned (axle ratio, other mods, tires, etc).

But I figured it was worth watching for the sound alone.

[harddrivin1le]

Originally Posted by Fleet 500

I wouldn't call mild head porting heavily modified.

As you said, more info should have been mentioned (axle ratio, other mods, tires, etc).

...and you personally disassembled the engine and examined every component in order to verify that's the only mod that was done (since the car was built nearly 40 years ago).

Assuming the OEM exhaust manifolds are retained, a 440 MOPAR needs a serious cam, blueprinted heads and racing fuel to run with a a new SRT-8 - even though the SRT-8 is a lot heavier (e.g. 4,200 pounds).

The SRT-8 engine makes 425 Net HP and there is some evidence to support the fact that it is (truly) "under-rated).

The 440-6 pack produces 330 SAE NET HP per Chrysler (1971 information) and both Hale's formula and dyno tests on production line stock examples support that rating.

Thus, the best 440 would require about 100 HP worth of mods in order to match the output of a bone stock SRT-8 6.1 liter hemi.

[harddrivin1le]

Originally Posted by henk4

if you had actually bothered to read the comment, you would have noted that he WAS talking about the engine in race spec.....which at best could produce 480 BHP....which is by all means poor for a seven liter car....

http://i218.photobucket.com/albums/c...g?t=1204578338

See the results under the "FORD" column?

Those were obtained with a freshly and professionally rebuilt 427 "low riser" Cobra engine that was devoid of all engine accessories and exhaust (tested like the Chevy engine shown in the photo). It was also fully blueprinted to NHRA specs and yielded an ACTUAL CR of 12:1. It was over-bored by .020" and fitted with a slightly warmer cam grind as well as the more efficient "header style" exhaust manifolds that wouldn't fit between the Cobra's frame rails.

As tested and when optimally tuned, that Ford engine made a best of 460 GROSS HP. Those figures were obtained on the 110 octane racing fuel that was required to support that high CR in those old, inefficient heads.

460 Gross HP would equate to something on the order of 400 Net HP in the "as installed" configuration - assuming reasonably efficient mufflers were employed.

That's a long way from the 550 claimed HP and it's also a good distance from 480 HP (NET).

550 HP is POSSIBLE in a 427 Ford, but only with a very radical cam grind, an even higher CR, full headers and various internal mods to keep it together at higher RPM.

550 HP is about what the full tilt 427 NASCAR racing engines were producing in the mid to later 1960s. Obviously the production street engines made far less.

[454MAG]

Originally Posted by Matra et Alpine

Loved the sound .... BUT .... what's the point ?
A heavily modified 70s car versus a lightly modified modern.
What rubber are they runnung ?
Wonder how many ACTUAL mods ? lightened perhaps ?
Please, Fleet, if you want to post these try to be balanced and recognise that your reputation means it raises objections

Stock 440 challenger vrs stock srt-8 Charger I think the Charger whould take the victory flagP.S The one in that clip is not a stock car!!

[454MAG]

Nice match up but lets be fair

[harddrivin1le]

Originally Posted by 454MAG

Stock 440 challenger vrs stock srt-8 Charger I think the Charger whould take the victory flagP.S The one in that clip is not a stock car!!

It wouldn't even be close.

PRODUCTION LINE STOCK 440 Challengers had a hard time breaking through the 14.0 @ 101 MPH mark.

Some of the old magazine tests show somewhat faster results, but it's well documented that most of the "press cars" from that period were specially prepared (e.g. blueprinted engines fitted with warmer than stock cams) examples that were purpose-built to impress the press.

Here is a video of a documented stock 440 6 pack Superbee (along with several other "muscle car legends), which is roughly 125 pounds heavier than a 440 Challenger. At most that weight deficit might add 1/10th and 1 MPH to the results (vs. the Challenger with the same engine). A bone stock SRT8 would walk all over that sloth.

MUSCLE CAR 1/4 mile shootout Dodge Ford Chevy AMC Pontiac - AOL Video

[Kitdy]

Originally Posted by harddrivin1le

It wouldn't even be close.

PRODUCTION LINE STOCK 440 Challengers had a hard time breaking through the 14.0 @ 101 MPH mark.

Some of the old magazine tests show somewhat faster results, but it's well documented that most of the "press cars" from that period were specially prepared (e.g. blueprinted engines fitted with warmer than stock cams) examples that were purpose-built to impress the press.

Here is a video of a documented stock 440 6 pack Superbee (along with several other "muscle car legends), which is roughly 125 pounds heavier than a 440 Challenger. At most that weight deficit might add 1/10th and 1 MPH to the results (vs. the Challenger with the same engine). A bone stock SRT8 would walk all over that sloth.

MUSCLE CAR 1/4 mile shootout Dodge Ford Chevy AMC Pontiac - AOL Video

What is a blueprinted engine and what are warmer/radical cams?

[nota]

Originally Posted by Kitdy

What is a blueprinted engine and what are warmer/radical cams?

How to blueprint a 1970 Falcon GT-HO

[Fleet 500]

This is a fun review to read of a 1968 Dodge Charger R/T with 426-Hemi. From the magazine "Speed & Supercar," Aug., 1968.