LOL.... C'mon, I'm pretty easyI just simply state facts of what the E.T. slip showed when I collect it on the return road....
It was said with 'tongue-in-cheek' .......... :burnout: Go > 318 ~ 2-Barrel
Just how quick were the 273 Commando's in the Quarter-Mile.
- Thread starter 69 Cuda 440
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It was said with 'tongue-in-cheek' .......... :burnout: Go > 318 ~ 2-Barrel
AJ/FormS
68 Formua-S fastback clone 367/A833/GVod/3.55s
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Yeah, if you check the chart, the 2bbl,single exhaust,low compression teener, was factored at 170 hp(.53hp/cid). If you built it to 273-4bbl specswhich made .76 hp/cid, then your teener would be around 240hp. That's an easy 30hp over the 210 factored 273. That, from 45 extra cubes. ,EDIT That is to say; build the teener to .76hp/cid. The .76 hp/cid is a pretty easy target to hit. It makes a 340/258hp; and a 360/274hp: easy/peasy.Course that's all theory.
Notice that the 340/258hp engine is pretty close to the 264 hp required to go 12.7 in that 2900 lb A.One might surmise that you could actually detune the stock 340/275hp engine, or the chassis.
Or, alternatively, a 360/274 hp engine could do the trick with a lessor suspension. But then, we already know that 360s get into 12s, with modest suspensions, or heavier As.
Notice that the 340/258hp engine is pretty close to the 264 hp required to go 12.7 in that 2900 lb A.One might surmise that you could actually detune the stock 340/275hp engine, or the chassis.
Or, alternatively, a 360/274 hp engine could do the trick with a lessor suspension. But then, we already know that 360s get into 12s, with modest suspensions, or heavier As.
In 1965,
The 'best' 1965 273/235 HP Barracuda {Torque-Flite} cars were running
right around 14.05 @ 97 MPH while classed in 'F/SA'
The 'best' 4-Speed cars were hitting 13.90's @ 99 MPH while classed in 'F/S'.
No 'legal' cars were running lower than that.
The 'best' 1965 273/235 HP Barracuda {Torque-Flite} cars were running
right around 14.05 @ 97 MPH while classed in 'F/SA'
The 'best' 4-Speed cars were hitting 13.90's @ 99 MPH while classed in 'F/S'.
No 'legal' cars were running lower than that.
AJ/FormS to be a little nitpicky, I don't see .96 hp per cubic inch race engine territory, maybe they way they did in the 60's. Now days 1.5:1 and above is in the race only territory. 1:1 is more like slightly hot street engine, decent cam 4bbl and headers gets you there.
And the 45 more cubes of a 318 doesn't make hp
If you build a 318 to commando spec it would put out similar hp just at lower rpm with more torque.
And the 45 more cubes of a 318 doesn't make hp
If you build a 318 to commando spec it would put out similar hp just at lower rpm with more torque.
AJ/FormS
68 Formua-S fastback clone 367/A833/GVod/3.55s
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I think you misunderstood.
The spec. I was referring to,is the .76hp/cid. Ergo; .76 x 318 =241.68 hp.
I could see how you made the jump.Post #77 edited.
As to the .97, well that was referring to the 273;ergo, .97 x 273 = 264 hp. This would indeed be a race273.
I agree that 1.1 on a 360, which being 396 hp. would not be a race engine, but certainly a pretty hot streeter.
On a 360, 1.2 hp/cid is still streetable(430hp),cuz in a 2900 lb A, it could easily go 12.7 on street suspension, a stockish TC, 3.55s and probably on skinny street tires.
The whole aim of the story was in response to poster 273, who in post #71, stated " My current 273 should run 12's.. ", and in his Avatar is an early Barracuda. For this to happen, the story applies; 2900 lbs, 264 hp, and a race chassis, minimum ET of 12.7sec. Chryslers empirical data is hard to argue with. Since he said "should",I was merely trying to help him achieve his goal(s).
The spec. I was referring to,is the .76hp/cid. Ergo; .76 x 318 =241.68 hp.
I could see how you made the jump.Post #77 edited.
As to the .97, well that was referring to the 273;ergo, .97 x 273 = 264 hp. This would indeed be a race273.
I agree that 1.1 on a 360, which being 396 hp. would not be a race engine, but certainly a pretty hot streeter.
On a 360, 1.2 hp/cid is still streetable(430hp),cuz in a 2900 lb A, it could easily go 12.7 on street suspension, a stockish TC, 3.55s and probably on skinny street tires.
The whole aim of the story was in response to poster 273, who in post #71, stated " My current 273 should run 12's.. ", and in his Avatar is an early Barracuda. For this to happen, the story applies; 2900 lbs, 264 hp, and a race chassis, minimum ET of 12.7sec. Chryslers empirical data is hard to argue with. Since he said "should",I was merely trying to help him achieve his goal(s).
Sneaky Pete,
What I remember from back in 1968.
When the traction was too good, the 273 would 'lag' off-the-line with the
stock Flywheel.
We got a Schieffer Flywheel 'heavy-wheel' which was 38 lbs. We still used a
Weber Clutch-Disc {9 1/4"} with a Borg & Beck Pressure Plate.
It kept the Rev's up when coming off the line.
And we came up with a 'home-made' Traction Bar, made from Channel-Iron
{3" Width x 18" Length}.
It worked fairly well.
What I remember from back in 1968.
When the traction was too good, the 273 would 'lag' off-the-line with the
stock Flywheel.
We got a Schieffer Flywheel 'heavy-wheel' which was 38 lbs. We still used a
Weber Clutch-Disc {9 1/4"} with a Borg & Beck Pressure Plate.
It kept the Rev's up when coming off the line.
And we came up with a 'home-made' Traction Bar, made from Channel-Iron
{3" Width x 18" Length}.
It worked fairly well.
All with a cam with intake specs of .415 lift and 203 degrees duration at .050.
My totally stock (exc electronic ignition) 273 2 barrel 65 Signet ran a 17.00 with 2.76 gears- in late 80s at 75/80 near Frederick MD
clifcuda65
Old Mopar Geezer
The STOCK 273 Flywheel from my 65 273 weighed 19 lbs 7.6 oz... I replaced the 273's 9.5 assembly with a factory 340 10.5 clutch/flywheel/bell housing assembly!
And the 10.5 340 flywheel weighed 30lb 3oz... And that's why I previously said I loved the way it now launches!!!
Also I use a Borg & Beck Pressure Plate & and my bullet proof SS Z-Bar (I use to break those early a-body z-bars)
Just for chuckles.. The 273 Bell housing was 28 lbs 8.6 oz...
And the 340's Bell housing was 12 lbs 2.4 oz
So I even saved about 5 lbs... Just saying :cheers:
That Sounds Correct
Nice looking Z bar and link right there!
Clif-Cuda-65
Excellent Post.
I remember back in late-1967, the first time I helped my Father pull that
heavy 'Bell-Housing' off my Mother's Barracuda.
You're right on, as it was one Heavy Freak. Unfortunately, we put it back on
in those days.
Nobody made those 'Z-Bars' back then. You had to modify your own by
trick fabrication.
clifcuda65
Old Mopar Geezer
Thanks 69 Cuda 440
After I had broken some of those stock Z-Bars, I did come up with an easy trick... They flex so much at the ends and go out of round because they are so very "THIN" that they then crack! All one needs to do is make a steel ring and press them on at each end... See Pic as it is self-explanatory! (Modified Stock 273 Z-Bar)
The only real reason I made a new one out of SS is when I did the Bell Housing swap, the original did not fit, so I machined one with the modification incorporated as part of it, but made it from Stainless because I had it laying around and it was tougher material !!! (Stronger even then the Modified OEM Z-Bar)
Oh Yeah, Not only those Bell housings were Heavy Freaks... But so was the A-833 4 speed... I now run with a Passon All Aluminum A-833... Now it's even easier to service the clutch disk... (And Lighter 82 lbs vs. 117 lbs) :cheers:
Clif-Cuda-65 :coffee2:
'WOW' ...... Es Muy Bonita !!
Awesome thread. Thanks for info. to all.
All this reiterates to me how lucky I am to own a commando equipped early a body and actually was fortunate enough to grow up with my dad tinkerin with his. Not the fastest in the world but wow they still bring smiles per mile or 1/4 mile.
Oldschoolcuda
All this reiterates to me how lucky I am to own a commando equipped early a body and actually was fortunate enough to grow up with my dad tinkerin with his. Not the fastest in the world but wow they still bring smiles per mile or 1/4 mile.
Oldschoolcuda
Late 1968
We swapped out the 4.56 Gears in my Mother's 1967 Barracuda {4-Speed} and
went up to 4.89 Gears.
To help the Top-End we also went from 26" tall 'Goodyear' Slicks to the
M & H Racemaster 'Cheater-Slicks' which were 27" tall.
She was hitting 14.20's @ 98 MPH, and was cleaning up for Class Trophy
at the end of 1968.
For a little more Traction, we added Shackle-Extensions {1 1/2"} and solid
Leaf-Spring bushings {with grease fittings} , 'rear' Torque-Boxes and
'Drag Shocks' {50/50} for the rear.
We swapped out the 4.56 Gears in my Mother's 1967 Barracuda {4-Speed} and
went up to 4.89 Gears.
To help the Top-End we also went from 26" tall 'Goodyear' Slicks to the
M & H Racemaster 'Cheater-Slicks' which were 27" tall.
She was hitting 14.20's @ 98 MPH, and was cleaning up for Class Trophy
at the end of 1968.
For a little more Traction, we added Shackle-Extensions {1 1/2"} and solid
Leaf-Spring bushings {with grease fittings} , 'rear' Torque-Boxes and
'Drag Shocks' {50/50} for the rear.
one would think that the commando with 3.55's would be worth more than a second on this..... kind of strange.
Or put one in an early a body which is essentially a go cart & you will be quick. Get rid of the bullshit early-a exhaust manifolds & you will be fast.
Everyone has documented times from the early days which were fast for the time.
Add modern rubber, tuning, and a few other basic mods that everyone else has done to a SB except to a 273 because their production run was limited and you will have a quick high revving exciting little setup.
AJ/FormS
68 Formua-S fastback clone 367/A833/GVod/3.55s
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I have a 273 kicking around. Since the mid 70s. Never gave it a thought. I bought it for 2 things; the rocker gear, and the 904 trunion tranny. Stuck em both on a 340, and swapped it into a 65 Valiant wagon. I didn't have $500 in it. Boy-O-boy did that little wagon go. Right up until the tranny started slipping. I dropped a slanty into it and sold it to my brother.He was 10 years younger than me, and wasn't into fast cars.He loved motorbikes. Yup that 273's been taking up floorspace for 40 years! Where has the time gone?
Obviously into nothing productive if that little 273 has been banished into oblivion by a misguided owner. Damn shame. LOL.
Free it from purgatory & sell it.
Yet another 273 thread pigged up "by 360 is best" BS. An answer to a question never asked.
AJ/FormS
68 Formua-S fastback clone 367/A833/GVod/3.55s
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Sorry boys.
clifcuda65
Old Mopar Geezer
Oh Well... I hear that a lot... But, So What... I like MY 273 4bbl's... I have had two... First One was my 1965 Dart GT Charger 273 w/4speed... BRAND NEW out of Brads Motors Fall River MASS.
Got it the same day the 65 model year hit the Show Rooms (White with Red interior) And it was QUICK, for a 273... Made a lot of NEW Proud Mustang Owners fear Darts that sported the Single LARGE Black Exposed Resonator Tip (early ones did not have the stainless tip)... And the Sound that came from it !!!
My 2nd 273 4bbl was a Commando "S" Barracuda w/4speed I purchased in 1973 for $400.00 from the original owner... I thought about putting a 340 in it... but the 273 has endured and it Surprises many Peeps when they hear it or see it launch... Keeping in mind, it's a 273 CID!!!!!!!!!!!
I for one like the 60's... And I'm proud to show my 65 Cuda... Even if my car and "I" belong in a museum!!! (I LIKE This THREAD):blob:
Geezer Clif of Az. :coffee2: (I need my Caffeine)
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