'84 1200 engine for a '82 GW

[slabghost]

There is a cam comparison thread here somewhere.

 

[joedrum]

1200 cams lift is lower and the duration is bit longer than the 78-79 cam witch is the mildest cam and 12oo next mildest followed by 1100 cam ..and then 75-77 cams as most aggressive with high lift and long duration also

 

[canuckxxxx]

Well, I have suffered a bit of a setback. Managed to gouge my finger real good taking 5 stitches to close it up. :head bang: :crying: Might be a few days before I get back to the oldwing.

image

• canuckxxxx
• Jul 5, 2015

 

[canuckxxxx]

Anyway, I was taking the left head off when I cut myself. I don't know what you can tell from looking at the combustion chambers but here it is. This is after about 500 km of highway riding yesterday.

image

• canuckxxxx
• Jul 5, 2015

 

[joedrum]

the plugs seem to be burning rather good ...and this is with your single dft ...pic shows a lot brian ....the project is costing blood sacrifice already ...

 

[canuckxxxx]

joedrum » Sun Jul 05, 2015 5:59 pm[/url]":1zujjoi5]
the plugs seem to be burning rather good ...and this is with your single dft ...pic shows a lot brian ....the project is costing blood sacrifice already ...

Yes, I think the single carb fueling is right on for the 1100. And I think that head looks pretty good, although I will tell better when I try to lap the valves.

Something that puzzles me is that the cylinder walls show very little wear, in fact the hone marks are still clearly visible and yet I was losing compression past the rings. :headscratch: Could it be that the rings wear much faster than the cylinder walls resulting in larger than spec end gaps?

Here is a shot of cylinder #4

1100 cylinder walls 1

• canuckxxxx
• Jul 5, 2015

Blood sweat and probably tears Joe. There is almost as much blood on my garage floor as oil and coolant, :smilie_happy: :smilie_happy:

Brian

 

[slabghost]

Next time ask first and one of us will tell you that getting cut is not fun and you will leak. More than likely you have a thin but hard glaze build up in the cylinder that no longer allows the rings to seat properly. Joe had to work hard getting the glaze out of the motor on Jyd.

 

[ekvh]

Interesting, and not to thread steal, but what would cause the glaze? Additives?

 

[slabghost]

ekvh » Mon Jul 06, 2015 6:24 am[/url]":3pb7oa1l]
Interesting, and not to thread steal, but what would cause the glaze? Additives?

I really don't have any idea what causes the glaze. But it is a common byproduct of combustion in higher mileage motors. With the high temperatures of combustion it could even be a build up of sand dust. Like the glaze on pottery. All I know for sure is with enough use every gasoline motor get's glazed cylinder walls.

 

[joedrum]

glaze is a problem ...and the only discount to boxer or horizonal clylinder layout ...it tends to build up on bottom part of cylinders and the top are cleaner ..

 

[canuckxxxx]

slabghost » Mon Jul 06, 2015 4:02 am[/url]":bnpjbweg]
Next time ask first and one of us will tell you that getting cut is not fun and you will leak.

Been working on cars and bikes most of my life and earned my living as a tradesman so I don't need to ask you what it's like to get hurt. :cheeky:

 

[slabghost]

canuckxxxx » Mon Jul 06, 2015 7:02 am[/url]":32djk5gw]

slabghost » Mon Jul 06, 2015 4:02 am[/url]":32djk5gw]
Next time ask first and one of us will tell you that getting cut is not fun and you will leak.

Been working on cars and bikes most of my life and earned my living as a tradesman so I don't need to ask you what it's like to get hurt. :cheeky:

No offense meant Brian. Just having a little fun trying to make light of the incident. I've been fixing machines my whole life and still do. I could actually feel that cut when I saw the finger. I've had all four fingers on my right hand crushed too.

 

[canuckxxxx]

Got a lot of time on my hands but can't stay out of the garage so playing around with the parts I now have laying around. :headscratch: :headscratch:

Something that fascinates me about the 1200 heads is that the intake ports are a close match with the runners on my single carb setup. About 1 1/4" for the port vs about 1 3/16" for the runner.

single carb runner vs 1200 port

• canuckxxxx
• Jul 6, 2015

Seems to me the whole intake would flow better with every thing being the same diameter.

Thinking, what if I put the 1100 rocker assembly on the 1200 head. The ends of the rockers seem to line up with the ends of the valve...to the naked eye anyway.

1100 rocker on 1200 head

• canuckxxxx
• Jul 6, 2015

intake valve

1100 rocker vs 1200 intake valve

• canuckxxxx
• Jul 6, 2015

exhaust

1100 rocker vs 1200 exhaust valve

• canuckxxxx
• Jul 6, 2015

The fly in the ointment is that the centre oil passage on the 1200 head goes to the hydraulic thing rather than the middle bolt hole.
1200 head

1100 rockers on 1200 oiling issue

• canuckxxxx
• Jul 6, 2015

1100 head

1100 rockers on 1200 oiling issue 2

• canuckxxxx
• Jul 6, 2015

Wonder what would happen if you put a 1200 head with 1100 rocker/cams on an 1100 with my single carb.

Brian

 

[joedrum]

thats a big fly brian and would strave the cam for oil ... the bigg ports at the head will not hurt anything at all ... and will create more volume in the tight turn already ...id say 1100 head would be better than 1200 head ..in my opinion

 

[ekvh]

I'm pretty sure Dan looked at swapping cams to 1200 heads and was stymied with no easy way.

 

[canuckxxxx]

joedrum » Mon Jul 06, 2015 4:40 am[/url]":39phrd6a]
glaze is a problem ...and the only discount to boxer or horizonal clylinder layout ...it tends to build up on bottom part of cylinders and the top are cleaner ..

So, Joe, should I sand the bottom of the cylinders on that 1200 I have sitting her?

 

[canuckxxxx]

slabghost » Mon Jul 06, 2015 5:06 am[/url]":1h4d7z9s]

canuckxxxx » Mon Jul 06, 2015 7:02 am[/url]":1h4d7z9s]

slabghost » Mon Jul 06, 2015 4:02 am[/url]":1h4d7z9s]
Next time ask first and one of us will tell you that getting cut is not fun and you will leak.

Been working on cars and bikes most of my life and earned my living as a tradesman so I don't need to ask you what it's like to get hurt. :cheeky:

No offense meant Brian. Just having a little fun trying to make light of the incident. I've been fixing machines my whole life and still do. I could actually feel that cut when I saw the finger. I've had all four fingers on my right hand crushed too.

Slab, you have helped me many times and you didn't deserve such a nasty response from me. I should have known you were kidding. :head bang: :head bang:

Brian

 

[slabghost]

No problem Brian. My sense of humor get's a little strange occasionally. The humor in my comment is actually in the fact that no one plans to get hurt so can't ask ahead of time.

 

[canuckxxxx]

Made some progress today :music: :music: got some boxes for parts from Costco :smilie_happy:

 

[canuckxxxx]

Forgot pic

image

• canuckxxxx
• Jul 7, 2015