biggest bore possible

[bdrue]

i was wondering about the 440 kits around, ive seen 440 kits where u have to send in your crank to stroke it and ive seen others with just the piston and the sleeve. is it possible to make a 440 without stroking the motor?

[EXDUNER127]

yes you dont have to stroke it, but if you did it would make the motor bigger in cc's, not the bore...

[chad502ex]

anything bigger than 440 (160 over bore) should be stroked!!

:macho

chad502ex

:D

[bdrue]

where can i send in my cylinder to get it bored and sleeved? cuz the shops around my area arent very....good:grr: oh and who does balancing and how many limbs do i have to give up:p

[K_Fulk]

You can go up to 465cc's on just bore. That would be a 92mm piston. I havent seen any bigger than that.

[44oEX]

you can bore and stroke it to 511 if you want

[EPDP99]

ive seen bigger. ive seen people using the pistons and stuff out of the honda 500 utility but its a big project from what i hear. then i guess you try to stroke that. lol

[397ccEX]

How much money total do you have too look into for everything to bore it over 44o

[K_Fulk]

I have the stuff I just dont remember how much it all cost. I havent got the whole motor together yet. Its typicly more expensive. I
I'm using an aluminum sleeve for mine and had to get it nickasiled, cases need bored, And you need a custom piston, Je made some pancake style pistons for my builder. I think those were around 200 each. Think he had to get 5 at once.

[cals400ex]

Originally posted by K_Fulk
I have the stuff I just dont remember how much it all cost. I havent got the whole motor together yet. Its typicly more expensive. I
I'm using an aluminum sleeve for mine and had to get it nickasiled, cases need bored, And you need a custom piston, Je made some pancake style pistons for my builder. I think those were around 200 each. Think he had to get 5 at once.


what is the benefit of that piston and sleeve? both just to save weight?

[K_Fulk]

Originally posted by cals400ex
what is the benefit of that piston and sleeve? both just to save weight?

1. Weight
2. An aluminum sleeve and aluminum piston expand at the same rate. Very minute but helps.
3. Heat, Alluminum sheds heat faster than the steel sleeves.

I should get pics of everything.

With that big a of a piston you get a lot more head volume. And have more room to go bigger on your valves.



Also a racer from my area has a 400ex with a -1mm stroke and a 91 mm piston to stay around 450cc's. Talk about a hi revving monster. Just another route to go that isnt typically used.

[cals400ex]

what do you really suggest for drag racing applications? i am most interested in 3rd and 4th gear power. i am debating stroking it and running taller gearing. can you run those pancake style pistons with a regular aftermarket sleeve?

[K_Fulk]

I dont see why you wouldn't be able to run them with a steel sleeve. Its just a piston. Look on curtis sparks website under the 465 pure power kit. I'm sure there kit is real similar but i think they use a standard sleeve.

The big 465 kit would be pretty good for drag racing. On sparks website it says there 465 kit run right wiht there 330r.
http://sparksracing.com/center/400ex/400x_465_pure_power.htm

[RIDER11X]

Motors that go past 425cc's on bore alone seem to be less reliable due to blown head gaskets, and cylinder stud problems. However Duncan Racing is making a billet cylinder called the PC4000 that is supposed to change all of that. If I wanted a drag motor in a 400ex, I'd go with either that billet cylinder, or a 425cc bore combined with a stroker kit, to get the most reliable motor I could. Don't forget the possibilities you have with cams, higher compression, lightened flywheels, race fuel, NOS, larger carbs, porting, etc.. There is so many options out there for the serious racer. :cool:

[K_Fulk]

Originally posted by RIDER11X
Motors that go past 425cc's on bore alone seem to be less reliable due to blown head gaskets, and cylinder stud problems. However Duncan Racing is making a billet cylinder called the PC4000 that is supposed to change all of that. If I wanted a drag motor in a 400ex, I'd go with either that billet cylinder, or a 425cc bore combined with a stroker kit, to get the most reliable motor I could. Don't forget the possibilities you have with cams, higher compression, lightened flywheels, race fuel, NOS, larger carbs, porting, etc.. There is so many options out there for the serious racer. :cool:

Do you have personal experiance with any 400ex motors over 425cc's?

[cals400ex]

i have only tried the stage 2 hotcam and the TC mx grind cams. the hotcam seems to be the highest revving drop in cam that i know of. i already have an aggressive port job, FCR 40mm carb, X-6, lightened flywheel (well its on the way), etc. i don't want to run nitrous or higher compression than 11:1. i just don't know if it would be good to run a stroker or go larger on the bore, etc.

[K_Fulk]

Either way you go its gonna be fast. You could have the best of both worlds and do both. I would get a heavy duty rod for a 92mm piston. And if your gonna do that you might as well just stroke.

Why dont you want to go over 11:1 compression? Just dont want to buy race gas? There is quite a bit of power your missing out on there.

[cals400ex]

yeah, no race gas for me. there is none around here for one. for two, i really don't get into competition racing, but just race for fun. i would get a new rod either way. i may just talk to laz and see what he has to say. i think i do want to get ahold of one of those pancake style pistons though.

[RIDER11X]

Originally posted by K_Fulk
Do you have personal experiance with any 400ex motors over 425cc's?

Personally........no. But I have heard alot of 440+cc horror stories, and read quite a few on here. Enough info for me to draw an opinion on them. And, my builder, who builds many race winning motors, strongly discourages building them. He claims his 425's will outrun well built 440's. We shall see, as he is building mine.:cool:
Sorry if my opinion offended anyone.:cool:

[K_Fulk]

Just checking, personally i have had better luck with my 440 then the 425 I have now.