Horsepower rating - Snowmobile World : Your #1 Snowmobile Forum

blackknight · 01-16-2002, 10:21 PM

Does anyone know how much horsepower the old 521cc motor made? *A dealer told me that the sled made 98 horse. *Does this sound too high to anyone? *Mike

P.S. *Anyone hear if winter is ever going to get here? Sad, but with this crap I'm ready for spring already. *

greygoat · 01-16-2002, 11:54 PM

BlackKnight
Your dealer is in the Ball park,i have a 85 plus with
that engine and used to talk to the boys at FAST,
they told me those engines made around 96hp.I gave
mine a .049 sqish, polished exhuast ports and geared
down to 22-38 from 26-38,no overdrive in these babies.
This old sled is fast,it will run about 155km if you give her
a little room,and it used to out drag every thing up until the
94Machs came out. I still have it and keeping it as a collector
as 85 was the first production independant front end for bombi as far as i know.
* * * * * * * * * * * * * *hope that helps
* * * * * * * * * * * * * * * GREYGOAT

rotaryvalvesrule · 01-16-2002, 11:57 PM

THE FIRST FOUR YEARS OF PRODUCTION THE 521 MADE ABOUT 88 HORSE. THE 85-88 MODELS HAD 40 MM CARBS. IN 89 THEY GOT DETUNED BECAUSE OF THE 583 IN THE LINE-UP.

blackknight · 01-17-2002, 12:18 AM

Thanks guys. *If you know of any sites showing these numbers let me know. *

Greygoat, I have a 1986 Plus that when new just destroyed everyone I rode with. *But that was then. **

*Thanks. *Mike

800MXZ · 01-17-2002, 05:53 AM

I used to have 86 F Plus. Greatest sled I have ever own!!! Bought used for $1300. When new, the guy took it to HRP and had Brad Hullings do the treatment! Pipes, porting, 580 big bore, 44 carbs K+Ns, the whole works! I bought it, filled it with gas, and took it out on our lake and could smoke the new Wildacats and VMax 750s all day long!! WIsh I still had that old tank!

MXZr · 01-17-2002, 08:02 AM

hello Greygoat, I believe the first production IFS SD was the 1981 (or 1980?) Blizzard 5500 MX

greygoat · 01-17-2002, 09:34 AM

Mxzr
You could be right there,but i rode one of those Blizzards
a freind had and his wasn't much of a sled.Do you think we should count it.
* * * * * * * * * * * GREYGOAT

rotaryvalvesrule · 01-17-2002, 11:12 AM

DYNOTECH HAS STOCK AND MOD HP RATINGS FOR THE 521. THEY ARE INCLUDED IN VOLUME 1 ISSUE 1. THEIR ADRESS IS 8 APOLLO DR. BATAVIA NY 14020. THOSE ARE GOOD MOTORS. MY BUDDY HAD AN 87 THAT CHEWED 650 INDY'S AND WILDCATS. GOOD LUCK.

Lasse · 01-18-2002, 04:50 PM

Hello * *

As far as I know, the ROTAX 521 cc Engine came in four (4) different versions.

they were called as followed:

* 532 * ( Safari Grand Luxe LC *-86 )
* 534 * ( I think this is the same engine as 537, but with Magnesium crank case ! )
* 536 * ( Formula Plus 89-92 )
* 537 * ( Blizzard 9700 83-84 , Formula Plus 85-88 , Formula Plus 500 -90 , Formula Plus-X -91 )

Hp example:

-87 Formula Plus , *"537" * 2*VM40 *= about 95 Hp. / 7800-8000 rpm
-90 Formula Plus , *"536" * 2*VM34 *= about 60 Hp. / 6900 rpm
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Does anyone know which type of RV-disc and jetting that were mounted in these two sleds ? :

* Formula Plus 500 *-90
* Formula Plus X *-91
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Sorry about the grammar and spelling ! *

permafrost · 01-18-2002, 04:58 PM

I used to have a 87 form plus it kicked a$$. *What a change from my 78 olympique, lol