BEX 283

[terry]

Does anyone have any history on BEX 283.......I have it from the present to the mid eighties? On another note, can anyone tell me the approximate RPM of a D2 equipped Bristol at 75 MPH in 4th gear? Phrased differently, is an overdrive a practical necessity if cruising at 75 MPH for extended periods is anticipated? Thanks, T

[AC Ace Bristol]

Terry.
   
   besides what is in/on the ACOC register, in Randell Baselt's register date Dec 1991, It has BEX283 as owned by R Romanansky, and refers to ACtion 7-83,
   (Romanansky ..997,Oakland Avenue.Plainfield NJ,07060  USA)
   also refers to Hemmings for Sale  2/91
   
   ACOC register refers to Ex ... J Capuk 1982, then R Romansky 83.
   
   Confirms left Thames Ditton 17/04/1957  Bright Blue/Met Red destined for Columbus /Ohio............. The name R Hagen is also associated with BEX283.
   
   Not sure if any of the above is new or confirms what you already know..[;)]..Hopefully it just might give you a new lead which generates more History on BEX283.........
   
   Good Luck with your Quest..
   
   Keith..[:)]

[terry]

Thanks, that does help by clearing up the Columbus, Ohio question. Thanks, T

[shep]

Hi Terry, my Ace Bristol pulls 6000 rpm in top with a fly screen and Dunlop L section 15 x 550 racing tyres. That equates to about 120 mph, so 70 would be about 3500 rpm. Busy but bearable, and about 22 mpg from experience. Avon tyres have a smaller rolling radius so would max out at 6000 rpm but only about 112 mph. With the full windscreen, I doubt we would reach 6000 rpm in top and would hit the wall at about 110 mph? I hope that helps, and best regards, Andy.

[AC Ace Bristol]

.
   Terry.
   
   I agree with Andy, I was led to believe a guide for a Ace Bristol 100D/D2 running on 16 inch wheels with Avon tyres  was approx
   19 / 19.5 miles per hour per 1000 rpm.
   
   I usually go by the rev counter as 20mph /1000rpm,  makes easy reading...  2000rpm =  40mph, 3000rpm   = 60mph,  3500rpm =70mph,  5000rpm = 100mph ,  6000rpm = 120mph.
   
   Overdrive will reduce revs, improve fuel consumption and be less noisey hence more comfortable on long journy's and less stressful on the engine.
   What diff are you running..[?].....3.9 .[?].....4.3  .[?]
   this will also have a bearing on speed per 1000rpm.
   
   Cheers
   
   Keith...[:)]

[shep]

Working out the rolling circumference of a Dunlop 5.50 x 15 tyre with 659mm dia as 2.0705m per revolution, and 10mph being 268m per minute, I calculate we need 129 wheel revolutions per minute at 10 mph. If at that speed we know the engine is turning at 500 rpm, and top gear is 1:1, then the diff ratio would be 3.87:1 which allowing for my approximations is close to 3.9:1
   Am I right?

[AC Ace Bristol]

.
   .
   According to Road & Track road test 183 AC ace Bristol D-2.
   Mph / 1000rpm in 4th   is  20.2 mph.
   
   According to Autocar road test AC Ace Bristol on  7th Nov 1958.
   Mph / 1000rpm in 4th   is  20.18 mph
   
   
   According to Motor road test 19/59 of AC Ace Bristol D2 26th Aug 1959
   Mph /  1000rpm in 4th  is  19.75 mph
   
   Confirms my guide of 20mph /1000rpm and substantiates Andy's
   mathematics of 10mph per 500rpm... [;)]...[:)]..
   
   Keith..[:)]

[3.5 Pints at the Bar]

But shouldn't we allow for tyre expansion due to rising temperature? Okay, I'll leave the room quietly :)
   
   75mph in 4th gear = 3750rpm approx. going by the above data. Seems a little high revving for cruising. An over-drive may extend engine life, as well as the other benefits Keith mentioned.