need HELP fast - quick question

[peecout]

I was wondering if a 440 kit should have a lot more power than a stock 400. My bro is looking to buy one right now and the guy is claiming it has a 440 kit. My bro just bought a 416 and claims that this 440 doesnt hit as hard when he snaps the throttle. Can someone tell me if a 440 should have tons more power than a 400 with equal gearing.

[Pappy]

alot will depend on the 440, the compression and its state of tune.

properly set up and all things being equal, there wont be much difference between the 416 and 440 ...remember thats all things being equal (compression, cam, etc)

if it feels like a turd...it might just be!

[GPracer2500]

Yeah, there are just so many factors at play. Judge the quad based on how it performs, not how its specs suggest it should perform.

Tell your bro to grill the guy for details: cam, compression, jetting, etc.

[sixer3]

yes, a properly tuned 416 can walk all over a crappy-built 440 anyday, but of course the 440 nicely cared for and tuned properly will walk on the 416 or 400....make sure to get as much information out of him as you can before you buy it.....if its doesnt seem right, keep lookin, you'll find one....patience really does help here.....save it for another month or 2 and get something you know is good to save you lots in the future

[peecout]

Thanks a lot guys! He decided to pass when the guy told him that he has always wondered if it was a 440 too. He was pissed that he drove 3 hours to go look at it!! The owner told him it was the cleanest quad around and it was beat down.

[400exrules]

it seems like its harder to build a strong, yet reliable 440 motor than it is a 416

[slvrlakerdr08]

i wouldn't buy anything that has been bored or engine work done because that usually means its been rode hard and sometimes raced which is pretty hard on it and you will probably end up putting some money into it if the guy just beats it without takin care of it.

[GPracer2500]

Originally posted by slvrlakerdr08
i wouldn't buy anything that has been bored or engine work done because that usually means its been rode hard and sometimes raced which is pretty hard on it and you will probably end up putting some money into it if the guy just beats it without takin care of it.

[counterpoint]

I'd sell my bored 400EX to my best friend with a clean conscience. They're not all junk/beat-up/worn out/built poorly.

[Sonic400ex]

Isn't the 416 piston closer to the stock weight than the 440. Set up equally I would think you would get a little more pop out of the hole w/ the 416 do to the lighter piston. I may be way off but just my logic.

[krt400ex]

Originally posted by Sonic400ex
Isn't the 416 piston closer to the stock weight than the 440. Set up equally I would think you would get a little more pop out of the hole w/ the 416 do to the lighter piston. I may be way off but just my logic.

The 416 will rev faster but the 440 has loads more torque

[GPracer2500]

Originally posted by Sonic400ex
Isn't the 416 piston closer to the stock weight than the 440. Set up equally I would think you would get a little more pop out of the hole w/ the 416 do to the lighter piston. I may be way off but just my logic.

An 89mm 12:1 JE piston is actually lighter than a 87mm 12:1 JE piston. The difference is quite small though.

[Sonic400ex]

I have read that compression ratio makes a much larger difference in low end tourge vs. bore size when you are talking about a rather small difference in bore such as 416 to 440. Is this true???

[GPracer2500]

Originally posted by Sonic400ex
I have read that compression ratio makes a much larger difference in low end tourge vs. bore size when you are talking about a rather small difference in bore such as 416 to 440. Is this true???

More or less. How much more or how much less I couldn't say. Your logic is valid though.

Like you allready know, compression is a major factor in an engine's ability to produce torque. Would a 13:1 416 have more torque than a 10.5:1 440 (all else being equal)? I'd bet it would. Would a 12:1 416 have more torque than a 11:1 440? I dunno. Maybe. Maybe they'd be about the same [shrug]. I'd want to see dyno evidence of both configurations before I could say.

[acz440ex]

I am running a 10.5:1 Wiseco piston from Thumper Racing. This piston is custom made by Wiseco to Thumper specs. If I remember correctly it was less than a gram lighter than the JE I had in it. I don't know if it is design combined with weight but it definately revs quicker than it did before. You can see below all of the other mods I have done to my 440. This works great for me. I run neck to neck with slightly modified 450's. I blow away slightly modified 400's. As far as reliability goes, I can't help you there. I just built this engine a few months ago. Everyone I talked to when researching my engine said high compression is where you lose reliability. I can run on 93 pump gas.