Engine Size

[rcturner]

If you do the math supplied in the tech specs for our Spyders, the engine size calculates to 1005 or 1006 CCs. Does anybody know what the real size is or why BRP advertises 998 ?

 

[Bob Denman]

:shocked: could you show the Math? I had it worked ou to 998 when I played with the specs...

 

[retread]

They rounded up the dimensions in their specs, actual displacement is 998 cc.

john

 

[boborgera]

Maybe they just like the sound of 998, Like Chevy liked 327 over 330, or 396 over 400.
OR it ''Really'' is 998 point something,? hyea:

 

[ARtraveler]

I will just watch on this one. :roflblack:

 

[otter28169]

Does it have to do with insurance regs? I know the 500SS that ski-doo put out a few years back was actually closer to a 600 cc engine. I know that it is cheaper to insure a 500 liquid cooled twin than it is a 600 LC twin. It sounded less silly when I said it in my head:banghead: but I will post it anyway.

 

[otter28169]

(3.1416/4)*(97*97)*68*2=1005 cc
((3.1416/4)*(3.82*3.82) *2.68 *2)*16.387 =1006 cc

There is only one conclusion.
The Rotax engine has only 1.986 cylinders, instead of 2.

:2thumbs::roflblack::roflblack::roflblack::roflblack::roflblack::roflblack:

 

[docdoru]

FIM measurement in Bonneville, UT Salt Flats: 960 cc.

 

[rcturner]

:shocked: could you show the Math? I had it worked ou to 998 when I played with the specs...

Volume is (PI()*r SQR)*stroke for each cylinder and times 2 for total displacement

 

[scooterexpress]

these post here all look greek to me.

 

[boborgera]

these post here all look greek to me.:roflblack:

Geek !:gaah:

 

[scooterexpress]

ok i'll give you that "geek" but sure looks like "greek"writing on the wall to me.:roflblack:

 

[Bob Denman]

...Sounds like Math to me... :gaah:

 

[boborgera]

...Sounds like Math to me... :gaah:
View attachment 60531

:thumbup:

Would be easier to just put a 1007cc sticker over the 990 one, I'm sure that will impress the other
bikers, Back in the 60's The STP oval sticker would add to any car at least a 50 hp gain. And as a side benefit, you couldn't hold a screwdriver with your fingers.:roflblack:

 

[Bob Denman]

I always thought that size really only mattered if you let it bother you... :shocked: :roflblack:

 

[otter28169]

Did they account for the altitude? If I am ryding the continental divide, do I have more displacement than when I ryde in New Orleans?

 

[jerpinoy]

998=3x3+(3x3)+(4x2):roflblack:

998=2x449:roflblack:

998=3x332.5:roflblack:

:roflblack::roflblack:

 

[retread]

Displacement formula I've been using over 50 years; .7854 X bore squared X stroke X number of cylinders.

john

 

[rcturner]

Displacement formula I've been using over 50 years; .7854 X bore squared X stroke X number of cylinders.

john

It comes out the same. 1005 cc

 

[rock]

i agree with you...i think ill just sit back n take this in....