Ok, gys, all the data you need to know how fast you can go is on my web
site. I've already done all this for my Tiger and Alpine. If you want to
have some fun also down load the Cartest program located on the first page
of the web site and play with it. Has 600 plus cars with all the pariculars
for each car. Modify to suit and run you car to top speeds through the
gears. Dos program. On my web site, Use the the Lawrence E. MAyfield Icon,
go to F=ma page and browse...
mayf
At 10:11 PM 4/13/00 -0700, Greg Locke wrote:
>Ok guys. I've sat down and done my arithmetic properly regards these rather
>fast alpine/tigers. The original figures I used were from graphs I had made
>for my 4 cylinder rootesmobiles from the formulae, but the range was not
>high enough (250hp out of a 1725 engine... I don't think so).
>
>Anyway, an Alpine, with a CD of 0.45, a frontal area of 18 sq ft, and
>weighing 2400lb would need theoretically 211 hp at the wheels to do 150mph.
>211 at the wheels would prob be about 280 flywheel hp (about 75% makes it to
>the ground).
>
>I'm not sure how the much weight affects it, up at these speeds, most of the
>hp is sucked up in aerodynamic drag, though rolling resistance which is
>weight related is still significant. I can't be bothered doing the full
>calculations for that but I'd guess another 10 horsepower would be adequate
>to haul an extra 350lb of driver and whatever extra weight these engines
>are.
>
>So anyway, Eric, with 325hp you should definitely be heading for the 155mph
>mark. Scaaarrrryyyy stuff.
>
>Checking my other calculations: a vehicle with driver weighing 1100kg (2425
>lb) with 250 hp at the wheels should theoretically do the 1/4 mile in 12.4
>seconds. Jims 290 hp tiger is prob about 220 at the wheels, and a bit
>heavier at maybe 1250 kg all up (2755lb). This gives a theoretical 1/4 mile
>time of 13.5 seconds (compared with his actual of 14.7) The formula for this
>though does not include specific aerodynamic factors for diff vehicles, as
>at more "normal" 1/4 mile times wind resistance isn't having that
>significant an effect.
>
>If anyone is interested in these formulae I'll post them.
>
>I am quite scared at the thought of my new project reaching 115mph.. you
>guys are very brave. It's much safer just playing with my calculator.
>
>Greg
>
>
>----- Original Message -----
>From: Greg Locke <glocke(at)ihug.co.nz>
>To: Alpine list <alpines(at)autox.team.net>
>Sent: Wednesday, 12 April 2000 13:05
>Subject: Re: My 55 engine
>
>
>> Regards Erics 150mph alpine: From my data and graphs here in NZs rootes
>development department I
>> calculate that an alpine with 18 square feet of frontal area and a cd of
>> 0.45 will need approx 250 hp at the wheels to do 150mph. Yeeehaaa!
>>
>> It will then also do around a 12 second quarter mile.
>>
>> Greg
>>
>----- Original Message -----
>From: <SSCCRacer(at)aol.com>
>To: <glocke(at)ihug.co.nz>
>Sent: Tuesday, 11 April 2000 20:47
>Subject: Re: My 55 engine
>
>
>> Greg
>> Thanks for the data, the engine I'm useing makes 325hp stock from GM.
>(LS1)
>> And your right......YEEEEHAAAAA!!!
>>
>>
>> Eric
>
>and
>
>----- Original Message -----
>From: <TIGEROOTES(at)aol.com>
>To: <glocke(at)ihug.co.nz>
>Sent: Tuesday, 11 April 2000 21:14
>Subject: Re: My 55 engine
>
>
>> Greg,
>> Interesting numbers considering the weight is similar to a Tiger. My
>car
>> with the old engine developed around 290 bhp, just a little hotter than a
>> factory hypo-289, and with 2.88 gears I ran a 14.71 (at) 101mph.
>> Jim
>>
>
>
>
>
L.E. Mayfield
124 Maximillion Drive
Madison, Al. 35758-8171
ph: 1-256-837-1051
http://home.hiwaay.net/~lemayf
Sunbeam Tiger, B9471136
Sunbeam Alpine Bonneville Land Speed Racer,
'66 Hydroplane Drag Boat (390 FE)
This archive was generated by hypermail 2b30 : Tue Sep 05 2000 - 08:56:19 CDT