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1999 Skidoo mxzx 440 with 98 big block 700 liberty Project

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  #1  
Old 01-02-2009
westman995
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Default 1999 Skidoo mxzx 440 with 98 big block 700 liberty Project

Ok as ive talked about before, i wanted to put the 700 big block liberty engine into my 99 mxzx 440 race chassis. And as you know the clutch blew up on the 440 which i believe to have also took out a crank bearing or possibly more. So i am starting to think of the 700 in the 440 chassis again. This will require some custom work, but i think it will be pretty sweet in the end. Right now the two things im worried about is the mounting, and exhaust pipe. There are a couple things in the way as far as mounting, but i think its very doable and shouldnt be too hard to get it in there, but i will need some help and ideas to do this. Ive got the 440 out of the sled, so im ready to start messing with this. If it starts looking like more than i want to do, then i guess ill just see whats up with the 440 and drop it back in there if its not too bad.
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  #2  
Old 01-02-2009
westman995
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As long as the engine is tilted right, the carbs will have no problem clearing the jackshaft. The 440 air box carb boots look to be the same length apart, with bigger boots from a 700 mxz or something, i think the stock 440 air box might work with it.

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  #3  
Old 01-02-2009
westman995
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This is the thing i am most concerned with, the steering shaft is most likely going to be in the way. The liberty engine seems much longer than the 440 doo engine. The mounting bolts are way farther apart also. So i will need to do some adding onto the motor plate as well as tipping the engine somehow.


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  #4  
Old 01-02-2009
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First things first..... get your MXZ apart and start cleaning. Take it to a car wash, go to the store get some "foamy engine bright" and soak it down, and spray it out. The engine bright will clean the oily residue and you can start over. You cant undertake a project like this going through all the oil and sludge.
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  #5  
Old 01-02-2009
westman995
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Quote:
Originally Posted by Kevin Garceau View Post
First things first..... get your MXZ apart and start cleaning. Take it to a car wash, go to the store get some "foamy engine bright" and soak it down, and spray it out. The engine bright will clean the oily residue and you can start over. You cant undertake a project like this going through all the oil and sludge.
Ya im gona have to clean it again. I had the thing pretty clean before the winter started, i dono how it got so damn dirty again already.

Thing looked pretty good before the engine went in it haha

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  #6  
Old 01-02-2009
Polaris1man
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Westy, it's time to build a ditch banger for yah, get a IQ chassis, and drop a modified 440 motor in it
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  #7  
Old 01-02-2009
westman995
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Quote:
Originally Posted by Polaris1man View Post
Westy, it's time to build a ditch banger for yah, get a IQ chassis, and drop a modified 440 motor in it
I would love to do that, but if i put in a modified engine id want it to be bigger than a 440, a stock 440 race engine is nice for what it is and can keep me happy enough for the ditches.

Let me know when you find an IQ i might be able to buy.. haha
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  #8  
Old 01-02-2009
westman995
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I think im gona need some help with this really. I dono how im going to make the mounts for it. The stock mount is made so you can move the whole mount and adjust it, so if the clutch/belt alignment isnt 100% it shouldnt matter as long as its close to where i cand adust it like that.

But does anyone have any ideas how to mount it? Im thinking i need the engine tilted to clear the carbs, and a new y-pipe. Or possibly just raise the whole engine up til everything clears, not sure how much that would be. I think that might also work.
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  #9  
Old 01-02-2009
westman995
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Ok ive got some idea on mounting the engine, not sure if it will work or not. I would like to not destroy any of the 440 parts, id like to keep all the 440 parts intact so they are still usable at a later time if need be. My idea involves cutting up the 700 motor mount, which i obviously wont use for anything else at this point, only if i were to sell it. But i could use it maybe. I dono if this is a good idea, or if it will even work at all. Just ideas.
I am hoping i can get some feedback on this, see what you guys think.

Here are some pics, i hope you can understand what i am trying to do. The 440 plate is the one with mounts attached to it, and the 700 is the bigger one, as im sure you know.

700 plate


440 plate


This is what i was talking about when i said you can adjust the placement of the engine with the mounts on this thing, so i should have a little room to adjust if its not 100% perfect, i hope.
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  #10  
Old 01-02-2009
westman995
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Now this is what i was thinking of doing to the 700 plate, cutting it out around the motor mount holes, as pictured in red, or about like that. And then i would set that plate on top of the 440 plate. It will give it some height to clear the jackshaft, if i dont tilt the engine and just raise it, it will clear both the carbs, and the y-pipe looks as it will clear the front support, and the pipe will either fit on it, or with little modification it will fit right. How does that sound? I wish i could just bolt the two plates together, but i dont see any room to do that, so i might have to get it welded, which will in turn make the 440 plate useless for the 440 if i need to put it back in. Motor plates arent usually too expensive tho. I need some feedback on this. Let me know. I havent checked for sure if it sits the engine high enough with that plate under there or not. But does it seem as if it would work fine if i do that? It should be strong enough? The two pto side motor mount bolts will be going through both the 440 plate, and the 700 plate, so it should give some more strength to it, but the other side both will only be going through the 700 plate. I think it should be strong enough with the two bolts through both plates, and then prolly weld the two plates together all around it, and maybe even in the middle of the 700 plate where its cut out, give it lots of strength.


Last edited by westman995 : 01-02-2009 at 09:02 PM.
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  #11  
Old 01-02-2009
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Sorry...I cant answer any questions until you get that pig cleaned up
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  #12  
Old 01-02-2009
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Quote:
Originally Posted by Kevin Garceau View Post
Sorry...I cant answer any questions until you get that pig cleaned up
Haha ill try and get it cleaned up pretty soon, i know its so much nicer working on a clean sled.
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  #13  
Old 01-03-2009
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You got a good Aluminum welder in mind??
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  #14  
Old 01-03-2009
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its worth a try? to bolt the 700 plate onto the 440 plate. before you cut anything, get some wood shims or nuts the same thickness as the plate, put them under the engine on the 440 plate, see how the hood closes, how the carbs fit, exhaust fit.
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  #15  
Old 01-03-2009
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And see where the pipe and can sit in the engine bay
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  #16  
Old 01-03-2009
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take you time and use mock ups before you cut anything.
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in a time of deciet telling the truth is a revolutionary act. george orwell.

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nothing goes like 3 holes.

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  #17  
Old 01-03-2009
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Just buy a Polaris.






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  #18  
Old 01-03-2009
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^^ he had one, but made swiss cheese out of the tunnel, dang ski doo lovers.
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  #19  
Old 01-03-2009
westman995
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No welder in mind, but i am sure i can find one. I asked a friend if he knew anyone, he thinks he does. So we will see. Shouldnt be much to get it welded up?

Ya im trying to mock it up first, but those would be my ideas. What if it doesnt raise it enough, what could i use to shim it up just a little bit more?

The thing is i dont have an exhaust pipe right now. I set my 440 pipe and can in there to see how it fit, knowing the same exact chassis came with 6-7-800 engines, the pipes will fit the same place as the 440 pipe, just the others will be bigger. The 440 pipe looks so damn close. I feel that if i got a doo pipe, it might be tight, but it could almost fit with no mods, I might have to cut up the y-pipe maybe, i dono but taht wouldnt be the worst thing.

One thing i just thought of, is the doo pipe. The skidoo engines all have rave valves. Is that pipe going to work on my non-ves engine?
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  #20  
Old 01-03-2009
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Pipes are made specifically for an engine. Why do you think aftermarket pipes are different for every application? The difference is the motor, not fitting the chassis. If you could simply swap pipes, then aftermarket pipes would just be for the chassis.
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  #21  
Old 01-03-2009
westman995
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Quote:
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Pipes are made specifically for an engine. Why do you think aftermarket pipes are different for every application? The difference is the motor, not fitting the chassis. If you could simply swap pipes, then aftermarket pipes would just be for the chassis.
Ya i know, but i was only thinking of making it fit til i remembered it had no VES, and the doo pipe i wanted to make fit the sled has valves.. I figured a doo pipe would prolly work ok. But now i remember the VES crap.. So im not sure if its going to work right.
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  #22  
Old 01-03-2009
westman995
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Do you think there will be enough cooling for my 700 with the stock 440 cooling set up?
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  #23  
Old 01-03-2009
westman995
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Well.. Im thinking twin pipes would fit under the hood, possibly. But i really want a single. Just how damn finicky are the twin pipes? I dont wana fuck around that much with getting it to run right.
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  #24  
Old 01-03-2009
westman995
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Ok checked some stuff up, shimmed it up to size that the plate would add. It is not enough. Should i still use the 700 plate? What should i use to add to it? If i give it more height, it looks very good that it will clear that steering shaft and i can leave it un-modified, which would be nice. Im not exactly sure how much height i need in between the 440 plate and the engine bottom, but ill get that measured up and see. Things look lots better when its raised up far enough. Right now i am wondering how do you measure center to center of clutchs or whatever? I want to use the stock 440 belt, i should be able to right?
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  #25  
Old 01-03-2009
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Westy, I would suggest selling the poo 700 and finding a 6, 7, or 800 doo out of a zx chassis. You should be able to get one for a bout the same price as you get for the 700. They should be easy to find, and should be a drop in application.
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