Engine Revs
Thread Starter
Racer
Joined: Jan 2000
Posts: 252
Likes: 1
From: Pembroke Ontario
Engine Revs
HI
As some of you know I reacently purchased a 64 convertible.
I was just wondering what your cars rev at at 60mph, mine is close to 3000 rpm at 60. It is a 327 365hp 4spd, I don't know what ratio the rear end is yet. I do know that this engine has awesome torque
Thanks Cole
As some of you know I reacently purchased a 64 convertible.
I was just wondering what your cars rev at at 60mph, mine is close to 3000 rpm at 60. It is a 327 365hp 4spd, I don't know what ratio the rear end is yet. I do know that this engine has awesome torque
Thanks Cole
Racer
Joined: Jan 2004
Posts: 277
Likes: 0
From: Bellevue WA
Originally Posted by JohnZ
3000 rpm at 60 mph with 27" tires (stock diameter) is a 4.11 axle; you'd be at about 2750 rpm at 60 mph with a 3.70. 
Melting Slicks
Joined: Apr 2002
Posts: 2,620
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From: 20 forward gears to shift through in MD
Originally Posted by JohnZ
3000 rpm at 60 mph with 27" tires (stock diameter) is a 4.11 axle; you'd be at about 2750 rpm at 60 mph with a 3.70.
Assuming stock diameter tires, 4.11 yields approximately 3000 rpms at 60 mph (with a 4-speed)...
Race Director
Joined: May 2000
Posts: 12,712
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It doesn't matter what the tire diameter is. The speed/revs relationship is fixed by the speedometer gearing. Different than OE revs per mile tire will just increase speedometer error.
The revs at sixty are simply the OE tire revs per mile times axle ratio.
760 x 4.11 = 3123
760 x 3.70 = 2812
Duke
The revs at sixty are simply the OE tire revs per mile times axle ratio.
760 x 4.11 = 3123
760 x 3.70 = 2812
Duke
Team Owner
Joined: Oct 2000
Posts: 38,897
Likes: 1,927
From: Washington Michigan
Originally Posted by SWCDuke
It doesn't matter what the tire diameter is. The speed/revs relationship is fixed by the speedometer gearing. Different than OE revs per mile tire will just increase speedometer error. Duke
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Le Mans Master
Joined: Jul 2003
Posts: 6,808
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From: Westport CT
I can confirm that your data suggests a 4.11 rear end, plus I suspect you have asked because it might seem to be high (read noisy) for a gentle highway cruising speed - yup. Do you have sidepipes? Lots of "music" going on . . .
Signed, Jack with the 365 hp 4.11 rear end sidepipe vert, hoping to listen to the music soon if it EVER stops raining or snowing in the NorthEast!
Signed, Jack with the 365 hp 4.11 rear end sidepipe vert, hoping to listen to the music soon if it EVER stops raining or snowing in the NorthEast!
Melting Slicks
Joined: Apr 2002
Posts: 2,620
Likes: 0
From: 20 forward gears to shift through in MD
Originally Posted by SWCDuke
It doesn't matter what the tire diameter is. The speed/revs relationship is fixed by the speedometer gearing. Different than OE revs per mile tire will just increase speedometer error.
The revs at sixty are simply the OE tire revs per mile times axle ratio.
760 x 4.11 = 3123
760 x 3.70 = 2812
Duke
The revs at sixty are simply the OE tire revs per mile times axle ratio.
760 x 4.11 = 3123
760 x 3.70 = 2812
Duke
Race Director
Joined: May 2000
Posts: 12,712
Likes: 2,271
Nobody knows there actual speed unless they go to the trouble of calibrating their speedometers, and I doubt if anyone other than John and myself have done that.
In the context of the original question the reasonable assumption is that the indicated RPM and speed were listed.
Duke
In the context of the original question the reasonable assumption is that the indicated RPM and speed were listed.
Duke
Melting Slicks
Joined: Apr 2002
Posts: 2,620
Likes: 0
From: 20 forward gears to shift through in MD
Originally Posted by SWCDuke
...In the context of the original question the reasonable assumption is that the indicated RPM and speed were listed.
