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i dont know if this has already been asked and its kinda a pain to search through all the posts an crap on here. so i know the KL family has a 84.5 mm bore. what is the max bore you can do to the klze? And what other engines are good to swap in the mx3 theres only so much you can do to the klze, so im looking for mad increase of hp. like 300hp.. i think i might be doing another swap if i can get a diff engine.

You won't make much on an overbore, to be completely honest. There are gains to be made, but the money would be better spent elsewhere...

300 HP NA btw? It'll be expensive. I'm shooting for 250 and that's expensive as is... Your biggest "bang for your buck" gains will be heads, cams, and exhaust.

your going to want kl turbo or bp turbo, easiest/cheapest way of getting those kind numbers. klze for the v6, and the bp for the 4 cylinder are the most common swaps. anything else and your going to be getting into alot of custom work/expense, youll also be walking on unknown ground so you wont have much if any help from anyone else...

You want to male a jump from 130hp to 300hp? Take it one step at a time. Jumping 70hp is a huge jump for that little car. Ya its not comparatively fast compared to what's on the road today as compared to when I swapped my ze back in 2003, but she ain't no slouch. People around here seem to have a hard time to get a ze to run right, and you can't get a simpler swap than that.

There's a few old threads about boring out a k8, I think they say either 2.0 or 2.3L max, the sleeves get too thin at that point. Ya the outside is the same dimensions, but the internal is made different. For what you'll pay in parts and machine labor, a KL would be cheaper. You still have to remove the engine. Also boring out only increases horsepower, not torque, so you'll still going to have 115ft-lbs until you stroke it, and that's apparently not cheap work. Look at MR.SPANKY he's got a stroked k8 turbo, but he hasn't been around in years. You'll also need to be able to tune it since no OEM combo will be setup for that.

If you're looking at non-conventional swaps, you better have a machine shop and a welder, or a big big wallet. Search around on those, highly suggested againt cause in the end, you'll have just a cut up mx3 that can't roll on its own wheels. and only worth as scrap. There's many, many people that talk and try non-conventional swaps, and the only person to prove me wrong is the guy that did the Mazota MX3.

ya thats what im saying. like what are other types of engines that will be good for the mx3 other than the ze. and im not to worried about machine shops, etc. my uncle owns a shop and has all that kinds of stuff, so boring, PP tuning etc is all for free. just basically looking for something with more HP than the ze and that i can add to it. so ill be saving some money. but at the same time i dont wanna bore it and make the walls to thin either ha. i want to turbo myze and nitro but ive heard alot of ppl say that the ze cants handle it? like i have Larger injectors, full exhaust, ss headers, throttler spacers, fuel pump, k8 cams. not sure if i need to upgrade thoes?. probinator ecu, k8 chipped ecu. ( depending on what one i want to stay installed or which one is better).

People have done FE3T,f2t, Toyota 4g I think it is (mazota), but really, they all seem pointless. People go f3et because the motor and trans is better to handle over 500hp. A 300 bpt would be basically bolt in and could do it all day long. 1000hp kls exist, it all comes down to how much you want to spend. Look at the goldmember turbo kl. If you want to be different, than so be it, but your demands to go a different motor for 300hp isn't really beyond what's capable with a k or b series.

More power than a ze stock, stock, 200hp. High hp 4cyls are making about the same, but less torque. Ya the k20 can easilly make 240hp I think with cams and k-pro but kpro is $1500 in itself. Not really a savings.. could look at the s2000 f20/f22 maybe? Other options would be factory turbo 4cyls. Spend big bucks for a speed3 motor and trans? Next would be v6s. Maybe the vg30 out of a maxima? Honda accord/acura tl 3.0 and 3.2l v6? They don't fit well in hondas, maybe the mx3 will take them better? Vw vr motor?

Dude, options are out there, but its not up to decide. Besides for the 3 motors I mentioned that have been done, that's all we know have been done.

Must be nice to have familly that will do that all for free. Even in parts,you'll need engine and trans, ecu and harness, order custom axles if your uncle can't make those. Trans linkages, convert to cable shifter and or clutch, depending on that the trans uses.. Convert to a manual steering rack if not pipe everything over if the rack doesn't get in the way, more fun if the accessories are on the other side with the new motor. Hopefully nothing gets in the way of the brake booster. Reroute or delete the AC if you have it, remove cruise. May have to move the rad or get a new one. Mew custom motor mounts of course. There's plenty of things, little and big you'll have to deal with...

thanks for the post dude.. tons of options. this is why i like getting different opinoins cause ive had some ppl tell me that its impossible to get 300hp from the ze or even 250-280.. thats why i was thinking a diff engine.. but if i can get close to 300 out of my ze than ill go that route.. i know you can get a bit more by boring but i wasnt sure if it would be worth it on the ze.. theres just so many opinions out there just cant decide on what one is right or wrong lol.. like last year i was gonna get a twin turbo rotory engine and put it in the mx3 and i was told that its nearly impossible to get it in the engine bay.

To help put it into perspective I'd talk with johnmx3ze (John). He turbo'd his car and has a lot of experience with it. I'm sure he can point out the pros and cons and maybe give you a few pointers. His work logs may help as well. Cheers, The Guy Who's Not Here Anymore.

ha ha i got that one dan.. ya get outta here lol

If you want a different motor look at the KJ out of the millenia S. It would be a wiring nightmare but comes supercharged and with some porting and polishing it can make close to 300 with the stock SC. But if you are looking to make a mazda engine 300whp N/A you are asking a lot, there is always a 20B :/

it is attainable if you don't mind your compression to be so high you have to run alcohol instead of pump gas.

There's a guy here in denmark, he had a 311hp n/a klze mx3.. I'll see if I can get some info on his engine..

i've done my best trying to translate this:

KLZE engine with:

- another ECU. klze chipped. (he was talking about MS when i spoke with him)
- decat
- different exhaust backbox
- injectors
- bigger cooler (NISSENS)
- oil cooler with fan and thermo sensor
- fuelpump. Walbro 255.
- different clutch (ACT)
- lightend flywheel
- headers from US
- different sparkplugs (think he said it was denso iridium)
- HT leads
- different type of ignition
- different fuel sensor
- bigger fuel filter
- bigger fuel pipes and hoses
- extra vaccum chamber
- egr removed
- FPR
- intake over bore
- lightend crank and pulley
- 3" stainless exhaust, tig welded (SIMONS)

here's some pictures you might find interesting. the text under the links is his image description translated.

http://www.bilgalleri.dk/uploads_xl_wm/ ... 1_10:12:12
Now has the intake been over bored and the flow looks right now.

http://www.bilgalleri.dk/uploads_xl_wm/ ... 1_10:12:12
Heads has been glass blowed (dont know the right term), machined, valve seats has been formcut, oversize intake and exhaust valves ca. 1mm (metric), racing valve springs, sanded (im not sure that is the right term) and pressure tested. it'll be nice.

http://www.bilgalleri.dk/uploads_xl_wm/ ... 1_10:12:12
I've ordered some things from US, Pistons and rods is rated at 10.000 rpm and 900 hp max.

hope you guys can use it, or at least understand my translation.

his car has been in a magazine called VMAX (DK's most popular tuners mag.) as a readers car.

as a bonus i know he has done a 450HP klde turbo. but i cant find specs on that.

Im not asking for the ze to be N/A making 300+hp. I know id have to do forced injection. But i dont think i'll go turbo. I will do a supercharger. I hate the leg turbo gives off

that spec list i just came with is making 311 hp in a NA ze. i think that it could be done at almost the same price as turboing or super charging, if you all ready got a ze in the car..

but i found some specs on his turbo project.. (just if people is interested)
here goes:

I'll keep my car for a while, cause i've just started my turbo project.

Called 3.345 KL-DE Singel Turbo Will bee Good hehe
Everything is split apart or blown glass ..

28/1-2009: Has there been ordered.

- Head gaskets set. (JAPAN)
- HKS Timing belt kits.
- K1 rods. (USA)
- Toga rod Bearings. (USA)
- JE / Pistons. (USA)
- Toga Main Bearings. (USA)
- Valves. (USA)
- Toga oil pump. (USA)
- Toga Water Pump. (USA)
- Turbo kits. With a Turbo T70
- Turbo Manifold off (USA)
- 540 jets from Nissan. (JAPAN)

Cylinder heads are pressure tested, grinded and assembled ..

lol well sh*t i might just stay N/A might save some big bucks