top speed of 318 duster?
#2
Mopar Lover
Back in 1980 I had a 1972 Dodge Demon 318 2 barrel carb auto trans w 2.73 rear gear, this thing had about 75,000 mile on it at that time... 112 MPH Wide Open, Out over Desert Hwy 395... That was it!!! and with its tong hanging out..
#3
A 3.23 may have been better for speed for that car. May be counter-intuitive, but it would bring more torque in the 100-110 range.
#6
Mopar Lover
I dont understand the question?????.......If you take a stock 426 hemi 440,413 wedge 383,360, 340,318,273,225,173... and the red line is 5,000 rpms or even 5500rpm and they all have the same rear gear ratio and the same gear ratio in the transmisson,, then outcome will be the same????,,,,True...The only difference would be that the bigger cubic inch engines would get to that speed quicker...and be more fun to drive...Bill...Am I right???
Last edited by pro-tech; 02-16-2014 at 02:23 PM.
#8
Mopar Lover
Better check your timing..LOl There are some good running 318s out there he also didnt specify 2 or 4 barrel carb. The old trooper cars ran good but if they ran them in pursuit for more then a few miles the #5 & 7 pistons would melt down and burn a hole through...So with that inside information ( I worked for the chrysler dealership) my friends would out run the cops all the time and get away because they were running big blocks and were modified...It was so funny to me to hear the cops tell the story of the pursuit and all the time i knew who it was they were chasing...Until one day they got him because he wrecked his car when drunk and being chased...Bill
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bigblock (02-16-2014)
#9
I dont understand the question?????.......If you take a stock 426 hemi 440,413 wedge 383,360, 340,318,273,225,173... and the red line is 5,000 rpms or even 5500rpm and they all have the same rear gear ratio and the same gear ratio in the transmisson,, then outcome will be the same????,,,,True...The only difference would be that the bigger cubic inch engines would get to that speed quicker...and be more fun to drive...Bill...Am I right???
Speedometers is the last indication of how fast you are really going when you compare car to car. That is, each car has different speedometer errors, partly due to manufactring tolerances, partly due to tire differences from stock. 118 on the fury may be 110 mph real, whereas 112 on the Dart may be 105 real. Nobody knows. Best way to eastimate speed is with an electronic tach, tire rolling resistance, and gear ratios. Even this can have errors due to tire expansion, and other factors.
#10
I dont understand the question?????.......If you take a stock 426 hemi 440,413 wedge 383,360, 340,318,273,225,173... and the red line is 5,000 rpms or even 5500rpm and they all have the same rear gear ratio and the same gear ratio in the transmisson,, then outcome will be the same????,,,,True...The only difference would be that the bigger cubic inch engines would get to that speed quicker...and be more fun to drive...Bill...Am I right???
Not really. More power equals more oomph up high to propel the car faster. Go extreme: think about a walkman motor in a Mopar. Same gears and everything as the 440. think it has the same top speed? You’ll not get a factory /6 to reach the same top speed a 426 wedge can; the juice just isn’t there.
#11
Mopar Lover
Got it ...So what you are saying is you will never red line a 318 in high gear if you are running tall gears because of resistance/drag on the car...It's like the song says its to the floor and there aint no more... I still think it is a bogus question there are to many varibles to give a accurate answer...Exhaust, fuel delivery,gear ratios, ....Its like when kids look at a car and say wow look how fast this car will go because the speedometer goes to 160MPH...Why would you ask a question like that???? You can make it as fast as you want if you've got the money to do it...Just saying
Last edited by pro-tech; 02-17-2014 at 07:28 PM.
#13
It takes some horsepower to go fast
I dont understand the question?????.......If you take a stock 426 hemi 440,413 wedge 383,360, 340,318,273,225,173... and the red line is 5,000 rpms or even 5500rpm and they all have the same rear gear ratio and the same gear ratio in the transmisson,, then outcome will be the same????,,,,True...The only difference would be that the bigger cubic inch engines would get to that speed quicker...and be more fun to drive...Bill...Am I right???
#14
Mopar Fanatic
5000 revolutions of anything going through a transmission with a ratio output (ex. 5000 in to a transmission and coming out 1000 rpms it's 5 to 1). Same rearend gears at 3.23 revolutions gives the same top speed no matter the driving force. The BIG KEY here is getting that engine with same ratios to actually reach 5000 rpms. That's where the elephant engine has the capability over the 318.
#15
68 Barracuda, 2.76 318 auto. 135MPH, clocked by my buddies Charger RT with a 160MPH speedo. The front end was slowly moving up and down at that speed. Didn't try it again.
Edit: Not a stock motor or exhaust.
Edit: Not a stock motor or exhaust.
Last edited by Lostviking; 09-29-2023 at 12:42 PM.
#16
Super Moderator
There is an equation for air resistance x speed but I’m not sure how it works. I do know that it can multiply hp required by two just for a small increase in speed. I’d say a stock 318 couldn’t pull 5000 rpm with a 2 Series gear in even an Abody.
#17
Mopar Fanatic
I know when they did top speeds in my 2010 Dodge Challenger SRT 6 speed, top speed was attained in 5th gear. 6th gear slowed the rpms down too much and speed went down. The 6th gear was good for gas mileage only.
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