Two Stroke Motocross

Two Stroke Motocross Forum => General Two Stroke Talk => Topic started by: JETZcorp on March 22, 2010, 02:54:55 PM

Title: They should make MX four-strokes like THIS!
Post by: JETZcorp on March 22, 2010, 02:54:55 PM

Normally, a four-stroke engine is a bit of a turd.  That's pretty-well agreed here.  However, There have been times in the past when some companies have made four-strokes that are truly insane.  Why have we never seen a turbocharged dirt-bike?  Sure, it's not allowed in official competition, but I think it would still sell on the novelty value.

Group B Rally Cars Sound (1983-1986) (http://www.youtube.com/watch?v=5UYUP4U3L6U#)

Title: Re: They should make MX four-strokes like THIS!
Post by: msambuco on March 22, 2010, 05:09:30 PM

How cool is this? (insert Taco Bell dogs voice)

Title: Re: They should make MX four-strokes like THIS!
Post by: offroader on March 23, 2010, 10:39:08 AM

A turbo on a db would hit to hard on spool up not to mention the packaging nightmare.There are some turbo xr's and rmz's and yfz 4 junks that have been turboed for dune riding.Might just as well by a cr or kx 500.

Title: Re: They should make MX four-strokes like THIS!
Post by: offroader on March 23, 2010, 10:40:08 AM

I should have mentioned that those 80's vintage rally cars were insane.

Title: Re: They should make MX four-strokes like THIS!
Post by: JETZcorp on March 23, 2010, 02:30:10 PM

They were insane, and that's what makes them awesome.  I wouldn't mind owning a 4T if the power came on like a bomb and there was a big sound of blow-off whenever you let off the gas to shift.  Besides, the power delivery couldn't possibly be worse than a Suzuki TM400.

http://articles.superhunkyforum.com/4/18 (http://articles.superhunkyforum.com/4/18)

Title: Re: They should make MX four-strokes like THIS!
Post by: offroader on March 23, 2010, 04:43:01 PM

Yep the Audi quattro's ruled the rally roost back in the day.Saab used to make a 2t street car.You should hear one of them.Pretty cool!

Title: Re: They should make MX four-strokes like THIS!
Post by: JETZcorp on March 24, 2010, 12:07:26 AM

Oh yes, they had a really nice sound.

Saab 96 2-stroke singing (http://www.youtube.com/watch?v=dXVRdSbKDT8#)
black 93 2-stroke saab on dyno (http://www.youtube.com/watch?v=fFPjY_shAUU&feature=related#)

Title: Re: They should make MX four-strokes like THIS!
Post by: rdub934 on March 24, 2010, 04:46:51 AM

That is awesome! I have wondered if their has ever been a 2stroke car in modern times. Those things sound down right nasty, in a good way. Does anyone have any performance specs?

Title: Re: They should make MX four-strokes like THIS!
Post by: Chris2T on March 24, 2010, 10:23:30 AM

how come turbo's are praised when they give 4 strokes some of the same characteristics that 2 strokes are badmouthed for - lack of bottom end torque, lowered reliability, increased gas consumption. My Saab 9-3 is turbo charged with a very mild amount of boost, maybe 6-8lbs. At that level turbos have advantages, but when you start dialing in serious boost it becomes a grenade. I'd much rather have a 2 stroke.

There's some videos on youtube that show 4t singles that were turbo'd, not many though. You thought 450F's were unreliable and expensive without turbo, imagine with a turbo? You could easily double the horsepower though, if you can afford it..

By the way, lots of youtube videos showing turbo'd 2 strokes, especially snowmobiles ;-)