DOHC on MS

[s1ckdrag0ns]

i was wondering if it is possible to put a 3000gt head on my MS block. i know that the engine sits the oppistite, but with alittle fabrication, will it fit? i know the block is the same (6G72), so the head should mount up right?

also could i use the pistons out of it as well to get some higher compression?

i am in the planning stage of building a monster. need some info, thanks.

~tony

[cwic]

Cant answer ur ? but wanted to tell u that in a couple of weeks I will be doing an 1/8 at a strip. Am waiting to get my throttle bodie back and then to do a little exhaust work. I will post my times when I do it.
Clay

[sirlordoz]

There is only one thing i know about motors, and that is that i dont know anthing about makeing them run, but u maybe onto something.
If they are bassed on the same block i dont know why u counldnt. I know the honda guys do that **** all the time, but some of it dose involve some machining!
Let me know i may be down with that!
Lata

[s1ckdrag0ns]

hey lordoz,

well my main ? is not if it will fit to the block. we are correct on that at least. since it is based on on the 6G72 block, it will bolt upto it. the ? is, will it fit inside the engine bay. being that it is a DOHC, i am wondering if i would need to cut the fender wells or something.

also, i am trying to do a drop on the MS. i have a 99 XLS, which has leaf springs in the rear and torsion bars in the front.
i have blocks for the rear, but i also want to get some drop leaf springs. i was wonderin if you know where i can get some,
or get some made. im only lookin for a 2-3" drop.


cwic,

hey man let me know your times. i am going to advance my timing 2 degrees and do some more weight reduction and see what i can do. i would just be happy if ican get under 11.3. but i am anxious to see what yours soes with some mods.
good luck.

thanks,

~tony

[sirlordoz]

Ok bro! here is what i think if it fits the block we can deal with the sheet metal and **** around it and make it fit!
As for the drop if i had the leafs i would be bagged by now! but this is what u can do turn the torsions down to get the hight u want on the back, what u mintruckers do is eatehr have the spring pack dearched or take it apart so that it will sag to the hight we want. Or just throw a block under the axle and drop it that way! eather way its all easy bro! Ill trade my rear swing arm for that any day!
Lata

[offroadmedic962]

i have a question, why not see if the whole engine from the 3000gt fits if it is the same block. that would save a lot of unwanted work. second, if your going to drop your rear end do it right especially if you plan on racing it. one thing you might look at is like they suggested take out the leafs you need to drop the rear but you will need to install something like kicker bars. they are a fixed bar that runs from the spring mounting bolts on the axle to a mount on the frame. they allow suspension movement but eliminate spring wrap. and you will have spring wrap if you remove leafs from the pack.

[offroadmedic962]

just a quick note i looked at a engine rebuilder site www.rpmrons.com/mitsengines.html and they list the 3000gt soch engine as the same part number as the montero sport 3.0 sohc engine. i believe that it could be assumed that the dohc engine would drop in just as easily. maybe some wiring for the cam postion sensors but no more than for changing heads. so i would save the work and just invest in a 3000gt engine complete than to frankenstien a motor together. just my thoughts . good luck

think of the turbo charged possiblities ..... drive it like you stole it

[cwic]

dont know why it too so long to think of this but u would need a new ecu. Possibly from the 3000gt but dont know/think it will be compatible with the tranny.
clay

[LB]

If this works you should not need a new ECU.

[cwic]

dohc=2 cams per head. Stock sport engine =1 cam per head. Timing would be completly diffrent as would intake and exhaust so the stock ecu would be lost and send u to limp mode.
Clay

[LB]

The computer doesnt need to know if it has 1 or 100 cams, it only needs to know the position of them. Since they will be on the same timing belt/chain, they will all be where they should be when the computer reads the 1 sensor it needs. You are confusing mechanical valve timing with computer controled ignition timing.

[cwic]

it will also change things like the volume of air comming in and going out.at some level there will most likley be a problem with the ecu.
Clay

[LB]

Thats what the MAF is for. It determines the amount of air entering the engine. If it was a MAP sensor only then there could be problems.

Again a seperate thing from the cams. But if the extra cams pull in more air then the factory ECU can compensate for then you might have a problem, however I find that highly unlikely, and it is a simple fix anyways.

If it makes you feel any better I run the eclipse 2.4l motor in my mirage with a 1.8l mirage computer and it runs it fine as long s you use the more restrictive 1.8l MAF. With the 2.4l MAF you need to have a SAFC to adjust the fuel.

As long as you keep your stock MAF then the stock computer is calibrated to that sensor to compensate for whatever air goes through it. If you boost the motor then it might not compensate.

[Joel_CA]

OBDII is becoming more strict each model year. If an excessive amount of fuel compensation is detected- it will be sure to set a fuel trim DTC depending on what model year vehicle the modification was performed on. I'm sure there are aftermarket piggyback controllers that can get around this but as you can see with the MSD Meltdown thread, it's getting more and more difficult to tap into OBDII monitored systems without triggering some type of fault.

Joel, CA

[cwic]

no hard feelings I just always assumed that putting the montero heads on my sport would mess up my ecu. Joel if someone were to do this what would they need? the t-belt from the montero would be 1 thing and for insurance a piggy back comp but can u think of anything else? I have the 3.5 so in my case the the full size montero's heads would prob be my best option.
Clay