air cooled topend on liquid cooled bottom

[brentoncole]

hey my cr 80 has an air cooled motor and it is cramped in my 1999 cr80 frame blah blah and a guy is selling 1996 bottom minus the top, my question is will my air cooled jug and head fit the stud pattern and if it does can i just plug up all the radiator holes and be good to go thanks hoping for a fast response

 

[Patman]

So how would you get rid of the heat?

 

[whenfoxforks-ruled]

Vintage Bob

 

[helio lucas]

brentcole, if the cylinder studs are in the same place you might get away with it.
BUT, and this is a big BUT (with only one "T") you have to make and test it carefully. i don´t know the older engine so i cannot tell you if it work.

best is to get a air cooled engine. really. less expensive almost for sure :cool:

 

[brentoncole]

i have a running air cooled engine in my bike and it is taking up to much space, the carb, gas tank, and kick start dont fit right so i cant put on an air filter or kick start my bike and this would solve all my problems
happy fourth!

 

[Patman]

So how would you get rid of the heat?

 

[brentoncole]

is it that hard how does my current motor lose heat the cooling fins duh lol

 

[whenfoxforks-ruled]

If a guy clobbered the older air cooled motor in the newer frame, the newer motor should go in the same way. BUT, clobbering the water and air cooled motor, together, is a even WAY more bizarre and even more unlikely to work at all. And after a cup of coffee, if you have the time and materials, this clobber job is just dumb enough to work? As far as I know, its not been tried, yet?

 

[helio lucas]

yes, it has been tryed. a portuguese motorcycle brand, casal, has built some motors in the past and many people put air cooled cylinders in the new engine with 6 speed gearbox instead of 5. the new engine is lot slower than the old air cooled engine but the old gearbox was overdated, pretty much like a truck.

 

[brentoncole]

well if someone that has expierience with or owns both motors can tell me if the stud pattern is the same and if it is i will go ahead and try it

 

[Patman]

is it that hard how does my current motor lose heat the cooling fins duh lol

So you have a special kind of water cooled cylinder that has fins? :coocoo: The water cooled cylinder has water jackets, so basically you have an area of dead air that will insulate the inner mass of metal not to mention the overall thicker chunk of metal you will have.

It's pretty obvious you have no clue what I'm pointing out. Not a big deal because sometimes ya' gotta' learn the hard way. Even if it does fit it will overheat.

 

[brentoncole]

no i dont understand what u are pointing out at all is there some kind of diagram u can show me, it sounds like you dont know where the heat is going it is a solid air cooled jug and head from a 1981? cr 80
as far i as i know there is a one or two coolant passages that connect to the jug that leads to the coolant pump and then there is a hose to the radiator then back to the head and thru the jug to start over again, but my air cooled topend is solid and should sit over the passages and skip all that my bike would dissipate and accumulate the same amount of heat as the air cooled motor currently does but i would have the space i need
ehhhh :( this would be alot easier on every one if we had some close up pictures of both motors types of cr 80 motors... i am not trying to make an air cooled engine im trying to make an aircooled smaller

 

[Patman]

My bad I had you putting the water jug on the air cooled case. Now the easiest way to determine if the bases line up would be a base gasket.

 

[Patman]

Looking at the parts diagrams I still think you will have some areas that previously had coolant flowing through them that end up with air space getting seriously hot that could cause you some issues IF the parts even fit which also looking at the diagrams does not look like something that will fit. I'll also venture fitting the pipe would be an issus but less so that the other items.

 

[helio lucas]

i was just about to say about the base gasket.
anyway, i get my cylinder off the bike today and between o lot of measures here it is:
the two back studs have 78 mm between centers.
the two right studs have 82 mm between centers. both uses a steel pin while the two on the left side don´t.
the base have a step on it. we cannot see on the parts diagram but here is a pic.
total lengt of the skirt: 20mm, step is well in the middle at 10mm. small diameter is 58 bigger diameter is 68.

after writing all of this i looked at the parts diagram and see that the studs dont fit, the new engine have cylinder and head studs separated and the old model don´t...

 

[brentoncole]

interesting can the studs be swapped out

 

[Patman]

Why don't you actually try it?

 

[helio lucas]

brentcole, please look yourself the parts microfiches!!!!!
before you ask where to find, here is the link:

http://servicehonda.com/look-up-parts/03

 

[SHSPVR]

Frist of all it not possable to run CR80R Elsinore air cooled jug on a newer CR80 that water cooled buttom end and it would been a hell of lot of work just to mod and old air cooled motor to water cooled frame and are you sure you have air cooled motor in newer frame or are you just blowing smoke??.
If you do have CR80R Elsinore air cooled motor then you need find 1979 to 1982 buttom end and below is why the two will not work
Air Cooled Stroke: 41.4mm
Water Cooled Stroke: 47.8mm
Posted a few picture of you bike I love see this.