Do you think 50hp can be reached on a 440?

[Mobile Dyno]

It's time for a rebuild on my 440ex. I have some mods in mind and may try to reach 50hp on a none stroked 400ex. Anyone seen a 50hp 400ex all motor (No NOS/Turbo)? Just wondering

I'm at 42hp now;)

[underpowered]

anything is possible. i have seen a 416 hit 40, so an extra ten should be doable with the extra 19cc's.

you could get a different cam profile, possibly a custom ground one, an FCR carb over teh 450r you have now, some different porting, larger valves, different exhaust, custom piston. if you wanted to get really into some ceramic bearings throughout to reduce friction, and some other stuff. plus i am sure you know it all depends on who/how the motor was put together and broken it will make worlds of difference in HP numbers. I would love to see you try it, i would love to get 50 horse out of my 426, or even know what i am at right now.

[JDMThoughts]

More compression will get you there, 12.5:1 leaves room left on the table. There is a conversion chart for how much power increase is possible with the addition of going up one full compression point. I wanna think it is something like 2-3% increase in power as well as torque. If your at 42. maybe a full compression point with a better matched cam will help, assuming your porting can keep up with the cam flow characteristics. I have seen people in automobiles have too much cam and a head that just doesn't keep up along with people who run to little compression and way too much cam. I am sure you could figure it out.

[Ruby Soho]

im upper 30's with my 406. so its diefinatly possible

[Pipeless416]

Originally posted by Ruby Soho
im upper 30's with my 406. so its diefinatly possible

:huh im not starting any hp debates but i find upper thirties on a 406 with a cam and a jet kit hard to believe..

[oldskoolex400]

yea i dont see that happening with just a cam and jet kit, with even an 11:1 weisco......

[CHEVYZ]

Possible with alot of trial and error, but not likely. If you get some good parts in high 40s should be very achievable.

[Ruby Soho]

Originally posted by Ruby Soho
im upper 30's with my 406. so its diefinatly possible

its close to 36.

not quite, probly around 34 if i tested it

i didnt mean like 38-39 if you know what i mean.

i have a question also, how can you check your compretion ratio

[oldskoolex400]

what is done to your motor then? are you just assuming 36 horsepower, it sounds like it, are you sure thats a stage 3 cam, or did the previous owner just tell you it was near 40 with a stage 3 cam?

with all the work mobile dyno has done and he is only at 42 horsepower, you have that done and assume your motor is 36? i takes more work that you have done just to get to 36...... just sounds like you are unsure of alot of stuff spouting a number out, but who knows...

[oldskoolex400]

dude you have stock exhaust, i call BS now, i thought you had a pipe, lol my 400 was around 35 lol and it had quite a bit of motorwork done, theres no way yours is 36 or even 34!

[Ruby Soho]

ok, whatever man i really dont care. thats what i figuired it was and i dont care if you think its BS because it probably is BS. i really dont care. that was my educated guess and i guessed wrong. whatever.

[Ruby Soho]

and yes, he said it was around 40hp when i bought it. and i thought it couldnt be.

and yes i know its a stage 3 cam, because when i had to put in a new head gasket i had to take out the camshaft. obviously.

i dont mean to argue but i just guessed, and people always assume people are trying to BS around here and try to be cool and tell everyone there engine is faster than the other persons. im not like that, i honestly thought that it could give me somewhere in the 30's. and 27 is stock no? if it is then i can see it being in the 30's. sorry for the trouble

[oldskoolex400]

you should have asked to see dyno sheets...lol

[Ruby Soho]

Originally posted by oldskoolex400
you should have asked to see dyno sheets...lol

i did ask him for them, and he didnt have them on hand so i called him the next day to see if he could mail them and he never did. i asked for all papers on it. i got screwed for the paper work of it, and the head gasket blew a week after i bought it. because the topend was not torqued when re-assembled. its been fine for over a month now and i checked the part #'s on the parts and its all there.

anyways, sorry for hijacking your thread mobile dyno

[oldskoolex400]

ill give you 30, thats it though, without a high comp piston that cam really doesnt shine, not a big difference, my 400 had a yoshi pipe, open airbox, jetting was right on spot, 416 11:1 JE piston, stage 2 HC, and a XC ported head and was only 36ish with all this work it was only mid 30's, and in your first post you said you believe your 400 to be high 30's....lol thats some pretty bad info




btw upper 30's is 38 39 mid 30's is 34 35 36

[Ruby Soho]

i have a wiseco .040 piston, does that count as a high comp piston?

[oldskoolex400]

good luck breaking 50 mobile! if you manage it you need to post the dyno sheets up

[oldskoolex400]

i have a wiseco .040 piston, does that count as a high comp piston?

the size of the bore has nothing to do with compression.... so no it doesnt count really you can get stock compression pistons in a larger bore size....

[BSTURDIVANT]

Go with a CP 13 to 1 and I'll send you a cam, springs, and valve cover (Way over .400 lift and requires the cover and rockers to be ground to clear) test it and post the results!!! it will be close!

[bayou boy]

50 would be sweet. even mid to upper 40's would be nice. good luck. please keep us informed:D