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,? :ohyea:

[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::roflbla ck::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:
60531

[boborgera]

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

[dabreitbach]

Its a french thing. They always had screwey math.:dontknow::dontknow:

[boborgera]

It comes out the same. 1005 cc


Then we can only conclude, That the Same engineer who did the math on the size of the gas tank,
Did the did the measurements of the bore and stroke, :joke:

Wheres Colombo when you need him?.:roflblack:

[stillriding]

Then we can only conclude, That the Same engineer who did the math on the size of the gas tank,
Did the did the measurements of the bore and stroke, :joke:

Wheres Colombo when you need him?.:roflblack:

And they asked him to decide where to place the air stem on the RT's rear wheel.

[boborgera]

And they asked him to decide where to place the air stem on the RT's rear wheel.


Yep, That guy is a jack of all trades.. And you know how the rest of it gos .......:rolleyes:

[Bob Denman]

It's the Metric system just messing with us again! :gaah: :shocked:

[Fusionfool]

...Sounds like Math to me... :gaah:
60531
Hmmm, I never saw that one.
I remember Gary Gnu 1960's The Great Space Coaster joke of the day:
When you are cruising down the hi way in your canoe, and you get a flat tire.
How many pancakes does it take to shingle the roof of a dog house?
Answer: Ice cream has no bones ;)

[bikeguy]

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 ?

The answer to the puzzle is in post number 5 of this thread.

http://www.spyderlovers.com/forums/showthread.php?33198-Actual-displacement&highlight=displacement

Don't ask me how Scotty knows this but I'd bet he's right. Maybe he'll check in and tell us.

Cotton

[NancysToy]

The answer to the puzzle is in post number 5 of this thread.

http://www.spyderlovers.com/forums/showthread.php?33198-Actual-displacement&highlight=displacement

Don't ask me how Scotty knows this but I'd bet he's right. Maybe he'll check in and tell us.

Cotton
Early spec sheets were not rounded off as later ones were.

[boborgera]

So, With that,
I guess everyone will have to cancel their orders in the 1005 cc decals. :rolleyes::rolleyes:

[Spy+]

Its a french thing. They always had screwey math.:dontknow::dontknow:
Maybe an Italian thing too.. I have a 696 Ducati...lol..

[boborgera]

997.6 cc decals are now available.


Plus I guess there will be the inevitable "BRP gyped me out of 0.4 CC and I want my money back" threads.



They don't have a leg to stand on, If anything they owe BRP,
The decals on their Spyders say 990. :roflblack:

[boborgera]

Its a french thing. They always had screwey math.:dontknow:


I think it was a French Astronomer who did the new measurements, Of Pluto.:roflblack:

[NancysToy]

They don't have a leg to stand on, If anything they owe BRP,
The decals on their Spyders say 990. :roflblack:
990 is the engine series designation for the GS/RS. The RT has the 991 engine series. It is not the displacement. Confused yet?

[boborgera]

990 is the engine series designation for the GS/RS. The RT has the 991 engine series. It is not the displacement. Confused yet?


I know that,
What i was referring to is the decal! on the Bodywork.

[NancysToy]

I know that,
What i was referring to is the decal! on the Bodywork.

Yep, that's what the decal refers to. Goofy, huh?

[Chupaca]

Don't you always round up if it is over 5... That would make it a 1000... Like all 50cc bikes are only 49cc's. :roflblack:

[Bob Denman]

I'm going back to bed if all of this Math keeps popping up...:shocked:

[dave01]

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

Time for a class action suit. I paid for 998 cc's and feel ripped off. Lol

[Bob Denman]

Some of the old NASCAR Boys must have running the calipers... :roflblack: