Maddog10 Posted March 28, 2010 Just wondering if any of you guys knew what a 450 MX bike compares to as far as power to weight ratio goes? Like maybe some sports car or something like that. I was going to use the comparison to for a project for school. Thanks in advance. 👍 Share this post Link to post Share on other sites
Santan9 Posted March 28, 2010 well at 255 lbs and 55 HP, its got a 4.6:1 HP ratio. so you would need the specs of other "toys" in order to figure out their ratio. my dad got a 2010 camaro SS. its 3900 lbs and 425 HP. thats a ratio of 9:1, so I dont think any cars would be in the same range. a 2010 mini cooper is 2600 lbs and 118 HP, thats a ratio of 22:1 I have a nitro RC race car that weighs about 9 lbs, and has 3 HP, thats a 3:1 ratio which is amazing. a 2010 mclaren f1 car weighs 2500 lbs and has 630HP, thats a ratio of 3.8:1 thats pretty close to the crf450. a yz 125 is 208 lbs and 32 HP (more peak than a yz250 believe it or not), so thats a ratio of 6.5:1 a 2004 pontiac montana minivan weighs 3700 lbs and 185 HP, ratio of 20:1 (horrible!) a 2010 cbr1000 weighs 440 lbs and has 178 HP, ratio of 2.4:1 a 2010 Ski-Doo MX Z Adrenaline 800R is about 450lbs and has 151 HP, ratio of 3:1 I just did all sorts of things and its hard to find something with the same ratio as a crf450. 1 Share this post Link to post Share on other sites
ebeck Posted March 28, 2010 I always use twice that of a Z06. Share this post Link to post Share on other sites
2strokenut My Rides (3) Posted March 29, 2010 well at 255 lbs and 55 HP, its got a 4.6:1 HP ratio. so you would need the specs of other "toys" in order to figure out their ratio. my dad got a 2010 camaro SS. its 3900 lbs and 425 HP. thats a ratio of 9:1, so I dont think any cars would be in the same range. a 2010 mini cooper is 2600 lbs and 118 HP, thats a ratio of 22:1 I have a nitro RC race car that weighs about 9 lbs, and has 3 HP, thats a 3:1 ratio which is amazing. a 2010 mclaren f1 car weighs 2500 lbs and has 630HP, thats a ratio of 3.8:1 thats pretty close to the crf450. a yz 125 is 208 lbs and 32 HP (more peak than a yz250 believe it or not), so thats a ratio of 6.5:1 a 2004 pontiac montana minivan weighs 3700 lbs and 185 HP, ratio of 20:1 (horrible!) a 2010 cbr1000 weighs 440 lbs and has 178 HP, ratio of 2.4:1 a 2010 Ski-Doo MX Z Adrenaline 800R is about 450lbs and has 151 HP, ratio of 3:1 I just did all sorts of things and its hard to find something with the same ratio as a crf450. A CRF450 does not make 55 hp and not at 255lbs. I think dry is 226? 226/51= 4.4:1 2010 KTM 250SX 208/50= 4.2:1 2010 YZ250 218/47= 4.6:1 Most 250 2-strokes built in the last decade are around the same power to weight ratio as the CRF450. What's makes a 450 so special?👍 Share this post Link to post Share on other sites
Santan9 Posted March 29, 2010 A CRF450 does not make 55 hp and not at 255lbs. I think dry is 226? 226/51= 4.4:1 2010 KTM 250SX 208/50= 4.2:1 2010 YZ250 218/47= 4.6:1 Most 250 2-strokes built in the last decade are around the same power to weight ratio as the CRF450. What's makes a 450 so special?👍 yeah but what does dry weight have to do with anything? who runs their bike dry.... but you could be right about the 55hp thing, im not 100% sure what the stock is, maybe 50 hp? and youre right, most dirtbikes are very close to the same ratios. Share this post Link to post Share on other sites
Santan9 Posted March 29, 2010 actual 2010 crfr 450: 235 lbs with all fluids, 51hp. ratio of 4.607:1 pretty close to my original numbers which I had estimated 👍 and for some reason I thought he said crf450x. Share this post Link to post Share on other sites
2strokenut My Rides (3) Posted March 29, 2010 yeah but what does dry weight have to do with anything? who runs their bike dry.... but you could be right about the 55hp thing, im not 100% sure what the stock is, maybe 50 hp? and youre right, most dirtbikes are very close to the same ratios. Bike without gas is what I meant. You can add what, ten pounds to all those weights? According to the last MXA test it was at 51hp. Share this post Link to post Share on other sites
2strokenut My Rides (3) Posted March 29, 2010 actual 2010 crfr 450: 235 lbs with all fluids, 51hp. ratio of 4.607:1 pretty close to my original numbers which I had estimated 👍 and for some reason I thought he said crf450x. I thought it would be unfair to portray the CRF450 at a fatass 255lbs🤣 Share this post Link to post Share on other sites
SpiritWalker Posted March 29, 2010 A CRF450 does not make 55 hp and not at 255lbs. I think dry is 226? 226/51= 4.4:1 2010 KTM 250SX 208/50= 4.2:1 2010 YZ250 218/47= 4.6:1 Most 250 2-strokes built in the last decade are around the same power to weight ratio as the CRF450. What's makes a 450 so special?👍 Were I live and race the 250 2 strokes are ran in the same class as the 250 4 strokes. And any one with an open bike can race with the 450s. I would think from your numbers the 250 2 stroke would dominate that class, but for some reason they don't. I have a 250 2 stroke and a 450, My 450 seem a lot faster to me. Imo. I still love my 2 stroke though, always will. Share this post Link to post Share on other sites
SpiritWalker Posted March 29, 2010 well at 255 lbs and 55 HP, its got a 4.6:1 HP ratio. so you would need the specs of other "toys" in order to figure out their ratio. my dad got a 2010 camaro SS. its 3900 lbs and 425 HP. thats a ratio of 9:1, so I dont think any cars would be in the same range. a 2010 mini cooper is 2600 lbs and 118 HP, thats a ratio of 22:1 I have a nitro RC race car that weighs about 9 lbs, and has 3 HP, thats a 3:1 ratio which is amazing. a 2010 mclaren f1 car weighs 2500 lbs and has 630HP, thats a ratio of 3.8:1 thats pretty close to the crf450. a yz 125 is 208 lbs and 32 HP (more peak than a yz250 believe it or not), so thats a ratio of 6.5:1 a 2004 pontiac montana minivan weighs 3700 lbs and 185 HP, ratio of 20:1 (horrible!) a 2010 cbr1000 weighs 440 lbs and has 178 HP, ratio of 2.4:1 a 2010 Ski-Doo MX Z Adrenaline 800R is about 450lbs and has 151 HP, ratio of 3:1 I just did all sorts of things and its hard to find something with the same ratio as a crf450. The new 2011 ski-doo xp 800r e-tec has 155+ hp. It's one wicked sled. Share this post Link to post Share on other sites
2strokenut My Rides (3) Posted March 29, 2010 Were I live and race the 250 2 strokes are ran in the same class as the 250 4 strokes. And any one with an open bike can race with the 450s. I would think from your numbers the 250 2 stroke would dominate that class, but for some reason they don't. I have a 250 2 stroke and a 450, My 450 seem a lot faster to me. Imo. I still love my 2 stroke though, always will. They can run in both classes here. You can't dominate with only 2 manufacturers selling them... Share this post Link to post Share on other sites
Maddog10 Posted March 29, 2010 well at 255 lbs and 55 HP, its got a 4.6:1 HP ratio. so you would need the specs of other "toys" in order to figure out their ratio. my dad got a 2010 camaro SS. its 3900 lbs and 425 HP. thats a ratio of 9:1, so I dont think any cars would be in the same range. a 2010 mini cooper is 2600 lbs and 118 HP, thats a ratio of 22:1 I have a nitro RC race car that weighs about 9 lbs, and has 3 HP, thats a 3:1 ratio which is amazing. a 2010 mclaren f1 car weighs 2500 lbs and has 630HP, thats a ratio of 3.8:1 thats pretty close to the crf450. a yz 125 is 208 lbs and 32 HP (more peak than a yz250 believe it or not), so thats a ratio of 6.5:1 a 2004 pontiac montana minivan weighs 3700 lbs and 185 HP, ratio of 20:1 (horrible!) a 2010 cbr1000 weighs 440 lbs and has 178 HP, ratio of 2.4:1 a 2010 Ski-Doo MX Z Adrenaline 800R is about 450lbs and has 151 HP, ratio of 3:1 I just did all sorts of things and its hard to find something with the same ratio as a crf450. Thanks for all your calculations Santan. Good gas for you 👍... I didn't have time to look them up and knew someone on here would have some info on it. 1 Share this post Link to post Share on other sites
Santan9 Posted March 29, 2010 The new 2011 ski-doo xp 800r e-tec has 155+ hp. It's one wicked sled. yeah ive heard good things about that e-tec. and the MXZ adrenaline 800r is one of the top 5 sleds of 2010, plus its a 2 stroke!! after a 4 stroke dirtbike, I would never buy a 4 stroke sled. 2 stroke all the way! Share this post Link to post Share on other sites
Chas_M Posted March 29, 2010 Comparing power to weight ratios in motorcycles vs cars doesn't mean much or at least is misleading until the rider's weight is added to the total vehicle weight. Share this post Link to post Share on other sites
Maddog10 Posted March 29, 2010 Comparing power to weight ratios in motorcycles vs cars doesn't mean much or at least is misleading until the rider's weight is added to the total vehicle weight. It's just for a speech in my Public Speaking class in which nobody knows anything about MX or MX bikes so its just somethin to give them a reference. They won't question it. lol Share this post Link to post Share on other sites
busted bones Posted March 29, 2010 well at 255 lbs and 55 HP, its got a 4.6:1 HP ratio. so you would need the specs of other "toys" in order to figure out their ratio. my dad got a 2010 camaro SS. its 3900 lbs and 425 HP. thats a ratio of 9:1, so I dont think any cars would be in the same range. a 2010 mini cooper is 2600 lbs and 118 HP, thats a ratio of 22:1 I have a nitro RC race car that weighs about 9 lbs, and has 3 HP, thats a 3:1 ratio which is amazing. a 2010 mclaren f1 car weighs 2500 lbs and has 630HP, thats a ratio of 3.8:1 thats pretty close to the crf450. a yz 125 is 208 lbs and 32 HP (more peak than a yz250 believe it or not), so thats a ratio of 6.5:1 a 2004 pontiac montana minivan weighs 3700 lbs and 185 HP, ratio of 20:1 (horrible!) a 2010 cbr1000 weighs 440 lbs and has 178 HP, ratio of 2.4:1 a 2010 Ski-Doo MX Z Adrenaline 800R is about 450lbs and has 151 HP, ratio of 3:1 I just did all sorts of things and its hard to find something with the same ratio as a crf450. The only way that YZ125 has more peak is if the YZ250 has a blown engine. A YZ250 has around 44-45 hp at 230 lbs which is 5.1:1 Share this post Link to post Share on other sites
Santan9 Posted March 29, 2010 The only way that YZ125 has more peak is if the YZ250 has a blown engine. A YZ250 has around 44-45 hp at 230 lbs which is 5.1:1 yeah now that you mention it, I regret saying that... I knew it sounded wrong. i went to a site that I cant find now and it had dyno charts of supposedly a yz125 and 250, while the 250 had a broader powerband, the 125s was steeper and went 1-2 HP higher at its peak. im guessing the site was wrong... or im wrong, maybe it was a 250f? Share this post Link to post Share on other sites
SpiritWalker Posted March 30, 2010 yeah ive heard good things about that e-tec. and the MXZ adrenaline 800r is one of the top 5 sleds of 2010, plus its a 2 stroke!! after a 4 stroke dirtbike, I would never buy a 4 stroke sled. 2 stroke all the way! My buddy just snow checked a 2011 xp800 xrs e-tec. They dyno'd them at 163hp. I have an '09 arctic cat D&D cfr1000, 196hp. I'm with you 2 stroke sled's all the way! Share this post Link to post Share on other sites
KcDavis My Ride Posted March 30, 2010 I just watched "On Any Sunday" again. On the movie, he was talking about a dirt track bike at 80hp and 300lbs would be like if your family car had 2000 hp. Now, I imagine a family car in 71 was quite a bit heavier than today....but you can still appreciate the comparison! Share this post Link to post Share on other sites
Shawn_Mc My Rides (2) Posted March 30, 2010 yeah now that you mention it, I regret saying that... I knew it sounded wrong. i went to a site that I cant find now and it had dyno charts of supposedly a yz125 and 250, while the 250 had a broader powerband, the 125s was steeper and went 1-2 HP higher at its peak. im guessing the site was wrong... or im wrong, maybe it was a 250f? it was a 250F. The reason they are faster around a course is because the power sticks to the ground far better with a four stroke than a two stroke. The tire has time to re-hook to the ground between power strokes. Dynos and track tests are completely different animals. Strap this on. CR500 with a port and polish, carb bored and other goodies. 72 hp @ 232 pounds. 3.2:1 👍 Share this post Link to post Share on other sites
