Most hp from a 400ex
Jan 20, 2000 | 11:41 AM
#1
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Weekend Warrior
Joined: Oct 1999
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What is the most hp anyone has seen come from a 400ex. I mean bored, stroked, cam, the whole nine yards... What is the most possible HP. I am trying to proove to someone about there HP they can make. Also if someone had a website showing some monster Fire breathing 400ex's let me know!
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Jan 20, 2000 | 04:28 PM
#2
Pro Rider
Joined: Nov 1999
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I don't want this to sound wrong....
So here is the answer to your question....
I have yet to see any actual instances of fire breathing 400ex's ..(the 440 kit seems pretty good).But I would think that your question is best answered with...How much Money do you want to spend..??..I would guess that a totally worked machine...including a major overbore...cam...port...carb...intake...pipe...val ves..etc...would easily produce 70-75 hp.maybe more( maybe?)..But there is so much to think about...and I really could be wrong..because by the time your done with all this work...you really don't have a 400 anymore. About the only part of the 400ex engine that would be original would be the block. The only way I am sure of getting this kind of HP in "bursts" Would be a nitrous kit of some sort.
I'm sure there are people out there that have or have seen some pretty worked motors stuffed into quads.... So good luck with that screamer!!
So here is the answer to your question....
I have yet to see any actual instances of fire breathing 400ex's ..(the 440 kit seems pretty good).But I would think that your question is best answered with...How much Money do you want to spend..??..I would guess that a totally worked machine...including a major overbore...cam...port...carb...intake...pipe...val ves..etc...would easily produce 70-75 hp.maybe more( maybe?)..But there is so much to think about...and I really could be wrong..because by the time your done with all this work...you really don't have a 400 anymore. About the only part of the 400ex engine that would be original would be the block. The only way I am sure of getting this kind of HP in "bursts" Would be a nitrous kit of some sort.
I'm sure there are people out there that have or have seen some pretty worked motors stuffed into quads.... So good luck with that screamer!!
Jan 20, 2000 | 06:19 PM
#3
Pro Rider
Joined: Aug 1999
Posts: 328
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I have a dyno chart for a 400EX with some work done to it. Peak hp was 40.5 at the rear wheels. Mods list is - 440 cc 89 mm 12.5:1 piston, cam, exhaust, intake kit, stock carb, and porting. A stock motor was on the chart for comparison and it peaked at 29.5 hp.
The above post is right about how much money do you want to spend. I would guess that running alcohol on this motor with a higher compression would boost the hp number into the 50's. Anything higher would indeed not be a 400 anymore. And yes, things like a turbo, nitrous, etc., would change things dramatically. The question is then... how long would it LAST??? Can you say grenade???
[This message has been edited by SandmanBlue (edited 01-20-2000).]
The above post is right about how much money do you want to spend. I would guess that running alcohol on this motor with a higher compression would boost the hp number into the 50's. Anything higher would indeed not be a 400 anymore. And yes, things like a turbo, nitrous, etc., would change things dramatically. The question is then... how long would it LAST??? Can you say grenade???
[This message has been edited by SandmanBlue (edited 01-20-2000).]
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