3.0ltr v6 mivec into a pajero

[WACKO]

does anyone have any ino on these motors?

i have been offered one minus altenator and intake manifold. will it bolt into my 3ltr (6g72) jtop or is it a differant block? im just looking for a bit more power, and if it will bolt in and be a suitable (ie have better useable power to turn 35s) replacement i will buy it and look further into getting the other bits i would need to get it running.

cheers, Sam.

[WACKO]

hmmmmm... liking the sound of this!

"MIVEC technology was also applied to the 3-litre 6G72 V6 found in the 1995 Diamante. In the Diamante 30M, the MIVEC V6 puts out 199kW at 7000 rpm and 301Nm at 4500 rpm. Its 10:1 compression ratio requires using premium unleaded fuel. Unfortunately, this engine lasted only two years."

but if it was only available for two years i may have trouble finding parts when i need them...

some good info on the 6g series here.. http://autospeed.com/cms/A_2852/printArticle.html

Sam

[Harreh]

If your engine is a DOHC I dont believe you will have any problems setting it up but I am 90 percent certain you will need a new ECU

[WACKO]

mine is the 6g72 sohc. im 100% certain i will need a new ecu because of the mivec, but im hoping it will bolt up to my gearbox and engine mounts. have an auto sparky friend who can help me out as long al i can geta loom and comp.

i think i will buy it.... im starting to like the idea of 200oddkws in mmy paj...

[Harreh]

Well to my understanding it should bolt up, the electrical work is the issue, thus why I went SOHC for my swap

[WACKO]

do you know if there were any issues with the radiator hoses or anything like that due to the motor being from a transverse mounted arangement?

any info you may have discovered in your investigations would be appreciated.

[Harreh]

If I remember through my research ALL 6G72 blocks used the same bottom ends and the same mounting holes, so if I remember correctly it will mount to your gearbox.

I've just fit a magna 12valve where my Pajero 12 valve went, when I say just I mean about 3 hours ago and it fits fine but it's a far wack of work making it fit.

Sump, all brackets, pulley's, belts, AC, powersteering, oil filter bracket, oil pump, water pump, water pump piping.

All of this had to be swapped over, this was a 12 valve pajero to 12 valve magna conversion, so even the heads were the same, shy of a different cam profile and compression ratio the engines are the same.

Where you might run into problems is stuff like oil pump, water pump, solid piping and whatnot might not be a direct fit on the DOHC engine like it is on the SOHC engine. I cant see it being too big of a deal, I've got a manual that covers both the DOHC and SOHC versions of the 6G72 and there isn't too many differences.

Also your 12valve exhaust headers will need to go and you will need to go get a custom fab job. Triangular patters on the 24valve apparently

[Harreh]

Another thing I would be concerned with could be intake manifold not bolting on to your current one.

However I think you'll find that the intake manifold from a DOHC 24 valve Pajero will fit onto this Mivec engine.

I believe the major differences in Mivecs was CR and cam profiles

[WACKO]

thanks for that. one of the guys in my club has fitted a v3000 motor to his rally truck and knows the diferances, but like you say, its still a 12 valve. i may have found a factory intake manifold, loom and ECU, so if i can get them aswell, i should hopfully be sweet.

looking at this pic, if i use the factory inlet manifold i will have to modifiy it as otherwise it will be pointing the intake into the firewall...



thanks again.

Sam

[Harreh]

No worries mate, when I was looking at dropping a DOHC in another thing I considered was to get some DOCH exhaust manifolds and seeing if I could get them to mate up to the rest of the exhaust or get a pipe fabbed from there back.

Would be a lot cheaper then going full custom extractors, ultimately though you will be going into unkown territory, from what I can tell nobody has done this swap before.

I was considering the swap because the DOHC's are a lot more abundant round here in good nick and damn cheaper then the SOHC's.

If anything else comes to me I'll let you know. I think someone also raised an issue about the Dizzy, it might mount at the back of the block and hit the firewall, but then again on the MIVEC one I'd also expect it to be coilpack so you might get away there.

As for the pic I meant using a factory inlet from a Pajero DOHC inlet.

[jonnyjtop]

wow will be a good project its something that i think would be worth a crack at...but if your going to go to all that trouble why not put in the twin turbo 6g72 206kw in stock form i think but run a bit more boost and a aftermarket computer and will probablt get up to over 250kw @ the fly and not only will you have an unstopabble off road monster it will probably also run a low 12 quater mile!

just do it....

[WACKO]

i did contemplate the twin turbo idea, but everyone over here wants alot for their tt motors, and i got offered this one for $200. also i think the tt will have alot more wiring to sort out as the gto has a SHETLOAD of electric crap on it. spoilers etc.and a aftermarket ECU is $$ i dont wana spend. but the tt has the JAP gentlemans powerlimit on paper but id say its a bit higher in reality.
i found a couple of jtops with twin turbos in them on jap sites bout a year ago, but cant seem to find them now :(

[WACKO]

looking like radiator hoses could be an issue, they come from the rear of the engine on the mivec....

[Harreh]

Hmmm, I'm sure if theres enough clearance you can work something out with routing the hoses.

[WACKO]

its not enough of a worry to stop me going ahead, just having them there is somthing more to think about.. have found a pic of the clutch end of the engine and it doesnt seem to have a dizzy so it must run coil packs which is a plus. but with the way the hoses are will make it interesting with firewall clearance.

[NJV6]

HI Sam,

Have you seen a torque curve for this motor?

199kw is some impressive figures from a 3.0.

[WACKO]

nah havent seen a curve. keen to tho. been on a mivec forum trying to read up on them and they go on bout it reving to 8200 and mivec kicking in at 6500, so im thinking it will be quite revvy. hoping to get a vtec controller thing as it will allow me to drop the mivec point down to where i want it. on mivec site they are talking down around 4500. there is a guy with a gto local to me on the site that sounds like hes looked into most variations of the 6g72 for his gto. think hes ended up with a 3ltr quad cam mivec twin turbo. he was looking at the 6g74, but think he put it back in the pajero and is using it as a tow wagon.

[WACKO]

found this site,

http://wrenchmonkey.com/Webpages/6G74swap.html

its american and relates to the mitsi eclipse and not mivecs, but has some usefull comparrisions between the 6g74 and 6g72. looking like i might be able to turn the intake manifold around to get a foward facing plenum if it dosent clear with a 90deg at the firewall end.
the 6g74 intake doesnt fit and i dont know of any 6g72 quad cam powered vehicles with longways mounted engines , altho the 6g74 pajero intake top half may bolt onto the bottom runners of the 6g72.

Sam

[jonnyjtop]

any ideas if the box/trsf case will fit yet?? i need a rebuild or a new engine very soon too??

in regards to the plemun chamber i think you could probably get a custom made pipe that will turn in whatever direction you want even if it is 90 deg there must be a bit of room between the firewall and intake...then you could run directly into a snorkle or wherever you want..

ps yeah there is something called a mivec controller i used to have one on my mitsubishi mirage you have to get them in japan i think i was lucky enought to see one in a import caryard and they ripped it out and sold it to me (it had a mivec engine conversion)

[WACKO]

from everything i have read on other forums so far, the block should bolt straight in and up to current 6g72 bellhousing.
all 6g72s should, so thats the gto twin turbo, the mivec and the std quad cam.
so thats a few options for motors. if going the quad cam route it seems you can use the foward facing plenum top bit from the 6g74 from the pajero on the 6g72 runners.

as far as intake on the mivec motor.. i could get a custom plenum made up, but if i can use standard bits then it will cost less and be easier to find parts if i have a problem later on. im already thinking of a larger throttle body if i do the conversion, if i was to make a custom intake i would probly look into 6 small throttle bodies from the likes of a toyota 4age 20v motor that comes standard with quad throttles. easy to get them and should get ample airflow. but thats getting way to far into dream territory for me now...

but while im i dream mode... how does a 6g74 over bored to 4ltr, fully balenced and lightened with 6 throttle bodys (1 per cyl), mivec quad cam heads(ported and polished of course) and twin turbos sound? .... mmmmm power...

[WACKO]

ps yeah there is something called a mivec controller i used to have one on my mitsubishi mirage you have to get them in japan i think i was lucky enought to see one in a import caryard and they ripped it out and sold it to me (it had a mivec engine conversion)

http://www.zentac.force9.co.uk/manuals/ ... smivec.pdf

[jonnyjtop]

sounds like if you start spending money you will never stop hahaha. id do it but try keep it standard as you can because once you start you wont stop.. 6 throttle bodies? thats bmw m3 style! ..iv been there before with lots of sports cars and stopped building them for now because the opporunitys are endless..thats why i got into 4x4ing thinking yeah big tyres a little lift and thats that...but its not the case you keep wanting more...if your anything like me once you do this conversion you will wish you did turbo it while it was out..if you turbo it you will want to boost it if you boost it you will want a front mount..then bigger turbos and so on and so fourth...

bottom line is id keep it simple if you know what i mean.....thats a hard thing for me to say if you had seen some of the cars i used to drive

yeah my mivec controller was different to that it had like a lttle knob on it with no digital readings but that was a few years back

[WACKO]

from another forum...

Sorry, if it was that easy I'd have already done it to my own 3.5 quad cam pajero.

I've sused it out and it's a major.


The main problems being all the coolant pipes from the front to the rear of the motor... they'd all need to be custom built.
You'd really need to have a good look at a stock 3.5 quadcam, they you'd understand why mitsubishi never built the pajero with the 3.0 quadcam...... it's all to do with the waterpump , the coolant filler and the space between the heads where it goes.It's also very tight between the back of the heads and the firewall. Not saying it's impossible by any means but a big tricky job and really not worth the hassle when you could buy a 3.5 instead.

Oh and the reason I looked into it is because I've got spare 6G72 quadcam motors (and the 6G74 quadcam Pajero) and can't find a spare 6G74 to throw into the GTO as a "later" project.

coolant pipes dont concern me, but the filler he talks of needs some more investigation i think. still, i reckon its doable, well.. the wiring is still an issue, but when i can either find a complete car locally to look at, i will know more on that.

i agree to keep it simple jonny, especially as it will be cutting into my $$ for my OE, but IF i had lots of $$... well..... it would be nice...

Sam

[jonnyjtop]

yeah i guess it all depends on how serious you are about your pajero...keep us posted on what you decide to do...you might find it might be easier to use the heads and other bits to freshen up your current motor but you will have to get a proffessional look at it and see what you can do..

[WACKO]

more from magn1t...

There's always those little things that people don't think about too.

With the conversion shown, it will be almost imopossible to fill the cooling system completely due to the fact that the front of the motor is the highest part. It's been overcome by Mitsi with the 3.5. If it isn't full of coolant then expect the front cylinders to cook.... murphys law.


But anyway, starting off with the right vehicle is always best.

Steve

now im starting to get put off as it was ment to be a straight foward swap. im going to call him tomorro and arrange to go to his place and look at his 3.5 paj and he has his gto there aswell so i will be able to compare a few things and it will give me a better idea what im up against.

im also going to hopefully get a spare transfur in the next couple of days and start the PTO conversion. will do a proper write up on that as im doing it tho.

Sam.