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670 ho vs mach 800
- the race to the 1/8 end
started by 670HOMAN
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January 11th 2008 at 9:33 PM
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670HOMAN
Junior Member
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145 Posts 
Group: Members
Member Since: May 17th 2007
Location: sault ste. marie, ontario, Canada
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would u belive it...a 670 walked over a mach 800 ...was done on the lake today..both sled are running mint cond...670 took the 800 off the line on a 1/8 m... of a stretch out ...
94 formula z with a 99 mxz 670ho motor
99 MXZ 670 HO (body got runned over)
94 wildcat 700 (sold)
91 rxl 650 (cooked)
91 indy 500 (wrecked)
87 exciter (sold)
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Site Supporter
Group: Site Supporters
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January 11th 2008 at 9:33 PM
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Xindyracing500X
Junior Member
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250 Posts
Group: Members
Member Since: January 4th 2006
Location: Canton, New York, USA
Current Sled: 1998 XLT Sp 600
2008-2009 Miles: 600
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both stock?
1998 XLT 600 Special
1991 Indy 500- sold
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January 11th 2008 at 9:36 PM
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670HOMAN
Junior Member
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145 Posts
Group: Members
Member Since: May 17th 2007
Location: sault ste. marie, ontario, Canada
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yes they were....670 was rebuilt with wisco's..800 was org..
94 formula z with a 99 mxz 670ho motor
99 MXZ 670 HO (body got runned over)
94 wildcat 700 (sold)
91 rxl 650 (cooked)
91 indy 500 (wrecked)
87 exciter (sold)
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January 11th 2008 at 9:36 PM
[ Modified January 11th 2008 at 9:37 PM
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FireCat59
Senior Member
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3113 Posts 
Group: Members
Member Since: February 3rd 2007
Location: Camden, NY, USA
Current Sled: 05 F7 SP
2008-2009 Miles: 800
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The Mach must have been running on 2 cylinders then, hard to believe but if you say so.....got a vid?
"Who cares about triples, I could hit myself in the face with a frying pan and feel just as good as riding 10 miles on xtra 10." hahaha
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January 11th 2008 at 9:36 PM
[ Modified January 11th 2008 at 9:40 PM
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Snowguy0001
H20 Pro
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183 Posts
Group: Members
Member Since: January 6th 2008
Location: Hanover, USA
Current Sled: RMK 800 02'
2008-2009 Miles: 50
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I belive it, those ski-doo's with the rotary valves are pretty wicked
when the rev chassie came out they actually produced three rev 800s with rotary valves and they decided it was too much for an average trail rider
2002 rmk 800
Slp twins w/STINGERS!
vforces
simmons ski's
shorty seat
8"wheels
4" pivot
ski-doo bearings on crank
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January 11th 2008 at 9:36 PM
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97xlt600
Average Member
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680 Posts 
Group: Members
Member Since: November 8th 2006
Location: Yale, michigan, USA
Current Sled: 1997 xlt
2008-2009 Miles: 370kaboom
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Do they have studs??
1997 xlt 600 trips beat a pair every time... IF they hold together!!!!
1992 wrangler lifted a lot of fun.
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January 11th 2008 at 9:37 PM
[ Modified January 11th 2008 at 9:38 PM
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670HOMAN
Junior Member
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145 Posts
Group: Members
Member Since: May 17th 2007
Location: sault ste. marie, ontario, Canada
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lol funny ...thats what eveyone was saying...sorry no vid..but wish i had.. Quote originally posted by 97xlt600
Do they have studs??
yes both had 192
94 formula z with a 99 mxz 670ho motor
99 MXZ 670 HO (body got runned over)
94 wildcat 700 (sold)
91 rxl 650 (cooked)
91 indy 500 (wrecked)
87 exciter (sold)
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January 11th 2008 at 9:41 PM
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670HOMAN
Junior Member
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145 Posts
Group: Members
Member Since: May 17th 2007
Location: sault ste. marie, ontario, Canada
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Quote originally posted by Snowguy0001
I belive it, those ski-doo's with the rotary valves are pretty wicked
when the rev chassie came out they actually produced three rev 800s with rotary valves and they decided it was too much for an average trail rider
mee too i belive it..lol i seen it..
94 formula z with a 99 mxz 670ho motor
99 MXZ 670 HO (body got runned over)
94 wildcat 700 (sold)
91 rxl 650 (cooked)
91 indy 500 (wrecked)
87 exciter (sold)
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January 11th 2008 at 9:43 PM
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FireCat59
Senior Member
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3113 Posts
Group: Members
Member Since: February 3rd 2007
Location: Camden, NY, USA
Current Sled: 05 F7 SP
2008-2009 Miles: 800
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It sounds so dam farfetched. whats the catch?lol 800 vs 670 ho. Both have the same set-up? Maybe if it was a longer race the Mach would've aten it up but idk. Whats the weight difference between the two???
"Who cares about triples, I could hit myself in the face with a frying pan and feel just as good as riding 10 miles on xtra 10." hahaha
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January 11th 2008 at 9:45 PM
[ Modified January 11th 2008 at 9:46 PM
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670HOMAN
Junior Member
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145 Posts
Group: Members
Member Since: May 17th 2007
Location: sault ste. marie, ontario, Canada
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Quote originally posted by FireCat59
It sounds so dam farfetched. whats the catch?lol 800 vs 670 ho. Both have the same set-up? Maybe if it was a longer race the Mach would've aten it up but idk. Whats the weight difference between the two???
lol thats the catch....about 75 lbs
Quote originally posted by 670HOMAN
Quote originally posted by FireCat59
It sounds so dam farfetched. whats the catch?lol 800 vs 670 ho. Both have the same set-up? Maybe if it was a longer race the Mach would've aten it up but idk. Whats the weight difference between the two???
lol thats the catch....about 75 lbs
no maybe 50lbs
94 formula z with a 99 mxz 670ho motor
99 MXZ 670 HO (body got runned over)
94 wildcat 700 (sold)
91 rxl 650 (cooked)
91 indy 500 (wrecked)
87 exciter (sold)
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January 11th 2008 at 9:48 PM
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FireCat59
Senior Member
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3113 Posts
Group: Members
Member Since: February 3rd 2007
Location: Camden, NY, USA
Current Sled: 05 F7 SP
2008-2009 Miles: 800
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Think it would make that much of a difference??
"Who cares about triples, I could hit myself in the face with a frying pan and feel just as good as riding 10 miles on xtra 10." hahaha
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January 11th 2008 at 9:53 PM
[ Modified January 11th 2008 at 9:54 PM
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600xcsp
village idiot
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1340 Posts 
Group: Members
Member Since: February 14th 2006
Location: cambridge, ontario, Canada
Current Sled: 05 600xcsp
2008-2009 Miles: 150
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50 pounds shouldnt have comprimised the race that much
ice snow or grass ill still kick your a**
i dream in black and white but ill kick your a** in living colour
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January 11th 2008 at 10:22 PM
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evan-lowrider
I HATE POOs and CATs
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730 Posts
Group: Members
Member Since: January 12th 2006
Location: collingwood, ontario, Canada
Current Sled: 2003 rev 440x
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i bet they both blew up and transformed into space ships 
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January 12th 2008 at 1:01 PM
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Revten
Starting Member
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47 Posts
Group: Members
Member Since: February 18th 2007
Location: Webster, ny, USA
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sh!t happens lol, not my sled by the way
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January 12th 2008 at 1:59 PM
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obee
Average Member
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763 Posts
Group: Members
Member Since: May 22nd 2006
Location: Orillia, On, Canada
Current Sled: 1997 Polaris Xcr 440
2008-2009 Miles: 2600
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I'd love to know which Lake in Ontario you were on, seems to me all of Ontario has been under a warm spell for the past week, the lakes weren't safe in the first place, then a solid week of above 10 degree weather wouldn't have helped it. Unless you guys are completely oblivious to the lack of ice.
Quote originally posted by BRP-4-LIFE
Before I continue, if I don't keep this sled for the whole season, I promise to never sign on to Snowmobile Fanatics again.
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January 12th 2008 at 2:23 PM
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enticer
driving slow is a waste of life insurance
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777 Posts
Group: Members
Member Since: March 7th 2006
Location: dakota, il, USA
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i have seen many 670s get eaten alive by many 600s. xcsp and zrt 600. i find it hard to believe that a 140 hp sled loosing to a 100 hp sled
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January 12th 2008 at 2:38 PM
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Revagade800x
Formerly known as luvsnowncold
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3046 Posts
Group: Members
Member Since: September 16th 2002
Location: Bangor, Maine, USA
Current Sled: 2006 Renegade 800 X
2008-2009 Miles: 1000
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Quote originally posted by Snowguy0001
I belive it, those ski-doo's with the rotary valves are pretty wicked
when the rev chassie came out they actually produced three rev 800s with rotary valves and they decided it was too much for an average trail rider
Hmm, I haven't heard of this before, I doubt thats true because look at those new 800R's motor putting out 149-151 HP way more then 800 with Rotary valves could produce.
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January 12th 2008 at 9:51 PM
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TeamSki-doo
Junior Member
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156 Posts
Group: Members
Member Since: August 29th 2004
Location: Hamilton, Ontario, Canada
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just to let you know a 670 puts out about 125hp
95 Mach 1 670
02 MXZ 800
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January 12th 2008 at 9:56 PM
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670HOMAN
Junior Member
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145 Posts
Group: Members
Member Since: May 17th 2007
Location: sault ste. marie, ontario, Canada
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Quote originally posted by Revagade800x
Quote originally posted by Snowguy0001
I belive it, those ski-doo's with the rotary valves are pretty wicked
when the rev chassie came out they actually produced three rev 800s with rotary valves and they decided it was too much for an average trail rider
Hmm, I haven't heard of this before, I doubt thats true because look at those new 800R's motor putting out 149-151 HP way more then 800 with Rotary valves could produce.
there both the same yr of sleds.....99
94 formula z with a 99 mxz 670ho motor
99 MXZ 670 HO (body got runned over)
94 wildcat 700 (sold)
91 rxl 650 (cooked)
91 indy 500 (wrecked)
87 exciter (sold)
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January 12th 2008 at 9:58 PM
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FireCat59
Senior Member
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3113 Posts
Group: Members
Member Since: February 3rd 2007
Location: Camden, NY, USA
Current Sled: 05 F7 SP
2008-2009 Miles: 800
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Polaris 600's are putting that out now. By the way, for you triple guys, that would be a "twin" 600 as well.  lol
"Who cares about triples, I could hit myself in the face with a frying pan and feel just as good as riding 10 miles on xtra 10." hahaha
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January 13th 2008 at 8:40 AM
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Revten
Starting Member
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47 Posts
Group: Members
Member Since: February 18th 2007
Location: Webster, ny, USA
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i beleive it, he said that the 670 had wiscos, probably piped and jetted.
hey 670 man do u know if the 670 cylinders have to be coated?
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January 13th 2008 at 10:08 AM
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MACHZRider
"!nmad !rettilps neelps pu deeps"
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447 Posts
Group: Members
Member Since: November 17th 2007
Location: West Chester, PA, USA
Current Sled: 2002 Arctic Cat ZL600 EFI
2008-2009 Miles: 712
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January 13th 2008 at 10:36 AM
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craigalen13815
Junior Member
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189 Posts
Group: Members
Member Since: November 23rd 2007
Location: norwich, New York, USA
Current Sled: 2008 MX-Zx 800R
2008-2009 Miles: not enough
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Alright, as I have ridden both I feel I probably have a better idea about this than most.
First off, regular 670's were good to 125 horse or there abouts. They were a strong motor.
In 1998 ski-doo came out with the summit x. Ski-doo almost always introduces new engines in the summit chassis first. Fewer summits sold, less warrenty claims should there be a problem. The summit x had the 670 ho motor in it. It was a conventional 670 engine with a different rotary valve profile and 44 mikunis. There were a few other changes but those were minor. Then in 1999 ski-doo went all out with the last version of the S-chassis. The mx-z 670 ho. Same motor in the 98 summit-x. Amsnow was claiming 138 horsepower out of this sled.
I owned one. My father owned a mach-z with the 779 triple. They were side by side to about 90, before the mach-z really came on.
The race he suggested was a 1/8th mile. 660 feet. I believe every word of what he says. On the 1320, I think the mach walks away. Anthing beyond that is mach-z territory.
Weight in these sleds is irrelevnt. They were both bricks.
Enticer, I would love to see the dyno sheets for a 100 hp 670 ho and a 140 horse mach-z.
Rotary valves went away for only one reason. The rotary valve intake had to be mounted very high on the jug which ment the carb had to be mounted even higher. The switch from lake racing and ice-racing to bump racing (I.E. Snowcross, hillcross,) made mounting the engine lower in the sled more desireable. It promotes a lower over all center of gravity. Rotory valve engines are still being manufactured my ROTAX today. They are just no longer used in sleds.
And for the record. If all else being equal, (displacement, bore, stroke) a rotary valve motor will always outperform a reed valve motor. Rotary valve engines breath better.
Now I have a question for those of you reading this, can you tell me who introduced the rotary valve engine in a snowmobile first?
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January 13th 2008 at 1:30 PM
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Bmxican
Turbo Rider
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2695 Posts
Group: Members
Member Since: February 14th 2006
Location: Maple Plain, Mn, USA
Current Sled: 2006 Switchback FST
2008-2009 Miles: 3400
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i find that kinda weird.
last year when i had my Fusion 600, i raced my buddy with his 99 Mxz 670 H.O.
i spanked him royally from one side of the bay to the other with a top speed of 102 mph on speedo.
"You Must Be Fast.. 'Cause I Was Hauling Ass When I Passed You"
2006 Switchback FST
2007 Switchback FST
2006 Fusion 600 H.O.(Sold)
2005 Yamaha Yz 125
1987 Indy 440
http://www.snowmobilefanatics.net/bmxican
[black] Never Knock On Deaths Door... Ring The Bell And Run Away![/black]
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January 13th 2008 at 6:57 PM
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gbaronet
Average Member
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841 Posts
Group: Members
Member Since: November 16th 2002
Location: Kitchener, Ontario, Canada
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Had my share rotary's, and a good running 670ho is no slouch, that said..
My guess is 800 was spinning like a mad, not a lot of room to make up lost lenghts in 660ft.
Your obviously getitng better transfer and traction it the hole.
The first Rotarys were OMC i believe.
When in Doubt, gas it
01 XCR 136 Edge 12k stock
00 XCR 136 Edge Flannery/HTG
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