How Many CC’s

[garry inglis]

eden that icalculator is like a level maths up north here we used to skive that lesson to go fishing

[eden]

That's because 0.785 has been rounded down its actually 0.78539816339

yup
still if your going to be bothered to work it out you may as well do it correctly rather than rough estimate.

[rosscla]

3 decimal places is a rough estimate?

The calculated result varies by 0.1 cc ...

[Darrell Taylor]

a basic acu method of calculating cubic capacity is bore x bore x stroke x 0.785

so 64 x 64 x 60 x 0.785 = 192.92 cc

that's wrong!


use this
https://lambretta-images.com/tuningh/po ... alculator/
or this
https://www.scooterhelp.com/tuning/defs.ccs.html
or this
https://www.icalculator.info/mathematic ... lator.html
or this
http://www.revetec.com/Calculators/Engi ... ator-2.htm

They all give the same result, 193.01943395806632 which most like mine round up to 193.02.

Its not wrong .... its what it said it was A BASIC ACU method that all acu motor sport events work to
what cc is a GT240 70 bore 62 stroke OR YOUR GT250 71 bore 62 stroke then ?

[eden]

a basic acu method of calculating cubic capacity is bore x bore x stroke x 0.785

so 64 x 64 x 60 x 0.785 = 192.92 cc

that's wrong!


use this
https://lambretta-images.com/tuningh/po ... alculator/
or this
https://www.scooterhelp.com/tuning/defs.ccs.html
or this
https://www.icalculator.info/mathematic ... lator.html
or this
http://www.revetec.com/Calculators/Engi ... ator-2.htm

They all give the same result, 193.01943395806632 which most like mine round up to 193.02.

Its not wrong .... its what it said it was A BASIC ACU method that all acu motor sport events work to
what cc is a GT240 70 bore 62 stroke OR YOUR GT250 71 bore 62 stroke then ?

That all depends on how many decimal places you use when calculating it which depends on how accurate you want the result to be
To answer your questions though, I again refer you to any one of the four links above

[Darrell Taylor]

blimey
a 240 thats a 238.6
and a 250 thats a 245.47
so how many decimal places is that calculator working to
yup
still if your going to be bothered to work it out you may as well do it correctly rather than rough estimate.

[eden]

GP200 is the NAME of a model of lambretta. the 200 refers to its CC which is actually 198
lambretta Li150 ......................... actual CC 148
GSXR 600 ................ actual CC 599
etc etc

Your point..... actually pointless!

OP was

Suzuki 185 (64mm) piston and a 115x60 crank. What would the CC’s be?

PS I dont know which 250 your referring too but one of them is 248.94 and another is 250.15 I'm sure your capable of working out whats in them nob head!

[Darrell Taylor]

referring to these that you requoted earlier,, catch up... bennie

what cc is a GT240 70 bore 62 stroke OR YOUR GT250 71 bore 62 stroke then ?

but you didnt answer and asked me to check on one of your calculator so i did ,whats the problem .... you asked and was getting all out a shape about a few decimel places on a cc calc so ive replied

not pointless to you ,,,yeah a 200 model is a 198cc ive no problem with that, but a man who wants to pull rank on a few decimel places should and at least follow his own lead on what he puts out there , bit like when 30 was never 30 ...

[eden]

You are such a clown, lol
It's "Benny" numb nuts!


What this 30? 5 years ago though so your selective memory is excusable I suppose.
Mr oh I will change the dyno setting after the event so it compares better to different dyno the same day and then claim the dyno is comparable lol.
As YOU say below, just a base run with no changes from road set up. Before the change to dyno settings it was over 30, had you forgot?
You publish dyno runs on your motors but don't send the motors out with the same settings you run them up on the dyno with. One came here last year to sort out why it was flat on its arse and was found to have a crazily big main jet in it, After just a 5 minute ride and re-jetted it was nice and he went away happy. You should have more confidence in your work



Jog your memory?

Nice wide power curve for a non reed original barrel with static timing in touring trim, One day I will have to put this barrel back on the road, then again as I'm now running barrels with better curves with reeds and programmable ignitions I cant see me ever needing it.

[Meds1]

Let piston diameter in mm =d
Let stroke in mm =s

CC = d x d x s x ( 11/14000) use as many decimal places as you like