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 Post subject: Automotive math
PostPosted: Sun Mar 14, 2004 10:12 am 
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Joined: Sun Feb 23, 2003 4:16 am
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Location: Ontario, Canada
There are a few questions that keep coming up, so hopefully this will answer some of them.

Displacement

Pi x radius of the bore squared x stroke x # cyl.
since displacement is expressed in cubic centimeters, then dimesions must be also in cent.
Example:
74mm bore becomes 7.4cm. Radius would be 3.7cm
3.7 x 3.7(radius sq) x 3.14(pi) = 42.986
42.986 x 7.7(stroke in cm.) = 330.9968
330.9968 x 3 (# of cyl) = 992.99046

Want to put 4.39's in your car, but don't know what it will do to your cruise RPM?

RPM = MPH x axle ratio x 336 / tire diameter.
fifth gear in our trannies is .76-1, so the final drive in fifth is .76 x selected ratio(4.10, or 4.39) Auto trans. are 1-1 in 3rd. gear.
Example
RPM = 60 x 3.12(4.10 x .76) x 336 / 22.74 (185 60 14 tire dia.)
RPM = 2766

Don't know what axle ratio you have, but have a tach?

Axle ratio = RPM x Tire dia. / MPH x 336


1 KW = 1.34 HP

Hope that helps.


Last edited by suprf1y on Wed Sep 27, 2006 9:03 am, edited 1 time in total.

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PostPosted: Fri Apr 02, 2004 10:17 pm 
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Location: Wayne, New Jersey 07470
various automotive calculations

http://www.bgsoflex.com/auto.html


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PostPosted: Sat Apr 03, 2004 5:49 pm 
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Location: Portugal - Lisbon
sweet ;)
keep it going

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 Post subject:
PostPosted: Sun Apr 04, 2004 8:06 pm 
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Quote:
sweet
keep it going


OK, here you go...

http://www.prestage.com/Car+Math/default.aspx


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PostPosted: Thu Mar 17, 2005 8:30 pm 
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IF I change my tires and wheels to 17" How off will my Speedo be? Check below

http://www.miata.net/garage/tirecalc.html

My Car Weighs 1800lb wit me in it, How Much HP do I need to put on the ground to run 10's????? see below

http://www.torinocobra.com/horsepower.htm

What other Cars have the Same Bolt pattern as mine?

http://www.wheelcollision.com/cta.htm

Looking for Parts in Junk Yards
http://car-part.com/


A few I have book marked

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 Post subject:
PostPosted: Tue Mar 22, 2005 3:58 pm 
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Here is some Extra info I got for the 88 Sprint

Exterior Dimensions & Weight
Metro Coupe Sedan Turbo coupe
Curb Weight - Manual (lb.) 1565 1565 1620 1620
Wheelbase (in.) 88.40 88.40 92.30 88.40
Length (in.) 144.50 144.50 148.40 144.50
Width (in.) 60.20 60.20 60.20 60.80
Height (in.) 53.10 53.10 53.10 53.10
Track Front (in.) 52.60 52.60 52.60 52.60
Track Rear (in.) 51.20 51.20 51.20 51.20


Info pulled from Below Link
http://autos.msn.com/research/vip/overv ... b=0&sub=-1

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PostPosted: Wed Sep 27, 2006 8:56 am 
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This has a lot of good links, I think it should be a sticky!!!! :twisted:

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 Post subject:
PostPosted: Wed Sep 27, 2006 1:13 pm 
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And so it shall be..

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PostPosted: Wed Oct 25, 2006 2:28 am 
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Here is a Link to find out what you would do ROUGHLY in a 1/4 mile if you only did the 1/8 mile.There are MANY different calculators here.
http://www.wallaceracing.com/Calculators.htm

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 Post subject: Re: Automotive math
PostPosted: Mon Aug 25, 2008 1:34 pm 
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Wow, this helps so much. I used to know all of these calculations, because I learned them from my grandfather years ago (he owned a transmission shop for 35 years). But, I've long since forgotten them. Thanks superf1y! And thanks to Kento for the bookmarks. I added them to mine as well.

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