Author Topic: Calculate CB750 top speed:  (Read 787 times)

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Offline MCRider

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Calculate CB750 top speed:
« on: September 03, 2014, 08:19:40 pm »
http://www.juric.org/mopar/tools/topspeed.php

Is this calculator adequate or does it not include everything. It's for a car. It seems close for the data entered.

Other calculators for bikes want to include one of the gear ratios.
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1988 NT650 HawkGT;  1978 CB400 Hawk;  1975 CB750F -Free Bird; 1968 CB77 Super Hawk -Ticker;  Phaedrus 1972 CB750K2- Build Thread
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Offline Tempast

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Re: Calculate CB750 top speed:
« Reply #1 on: September 03, 2014, 08:31:20 pm »
It seems pretty close. My Z31 300ZX Turbo has a top speed of about 151 MPH, and with my specs
3.7 rear end
6000 RPM redline
225/50R16 tires
.8378 final drive

151.33 MPH top speed.


Wikipedia says the Shiro special was capable of 153 with no limiter, so this is pretty accurate. Most people's top speeds have been around 135-140 but their engines are far from new.

Offline Tempast

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Re: Calculate CB750 top speed:
« Reply #2 on: September 03, 2014, 08:32:20 pm »
Oh and remember power is usually the limiting factor in top speed runs. Most cars and bikes run out of breath in top gear well before their redline.

Offline PeWe

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Re: Calculate CB750 top speed:
« Reply #3 on: September 03, 2014, 10:57:32 pm »
There is a very good Excel file for CB750. Search CB750SOHC Gearing Chart.xls

Scroll down here: http://www.sohc4.net/cb750-faq/indexphp/sohc4-gearing-chart

I have edited my copy so it cover km/h as well.
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline petejohno

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Re: Calculate CB750 top speed:
« Reply #4 on: September 03, 2014, 11:46:58 pm »
Try this:         www.gearingcommander.com/

A great site for all your calculating needs. It will also display graphs etc. for multiple gearing combinations.

johno