CPI "LIGER" Cylinder project
Posted: October 18th, 2010, 8:34 pm
Ok guys here some pictures of my cylinder, just snaped some pictures but have not put a degree wheel on the cylinder yet
The cylinder has been cut down 5mm on the bottom side because the piston was to far down the cylinder.
Calvin admitted to miscalculating the cylinder height
So we had to adjust it by removing 5mm of material.
It was spun on a large lathe and did it with a expanding mandrel to keep it square to the bore.
In some of the pictures you can see that the bottom of the intake floor started to window from removing so much material.
This gets filled with the spacer plate that will get shaped to the floor of the intake.
To avoid this their are a couple options.
-Use 86 cases, they are 5mm shorter than the other years.
I should have done this since I do own 86 cases but we did not realize that the piston was going to be 5mm down the bore on my 93 and had already relieved the cases for the larger skirts and the cases had already been relieved for the +6mm stroke on the crank.
Plus we didn't realize 5mm would take us into the floor of the intake.
Second option which I believe is going to be available in December is a different piston with the pin height moved 5mm.
The only bad thing is I do not know how many pistons he has ordered but I will bet that it will not be as many as he has for Sabertooth cylinders which is the style that I am running.
So in the far future you may end up ordering 10 pistons(min order) from wiseco if these cylinders don't take off for the cr500 guys and Calvin quits carrying them.
One advantage(in my opinion) of my setup will be the crankcase compression will be higher.
There were some questions before on the coolant inlet and outlets on these cylinders. I will say that my opinion is still out weather it will flow enough.
The factory inlet is about .680ish the cpi cylinder fittings are about .600 and look like .625 will be easily accommodated.
There is flow directed thru both the cylinder and cylinder head with most of it directed thru the head which makes the most since to me.
Cooling is not a large factor for me since I run alcohol but a gas motor would need some good cooling.
I think if I ran a gas motor for long lengths of time cooling would need to be addressed. I think I would talk to RK Tek about having him machine a head for this cylinder that would have large inlet and outlets.
I do not believe a dual outlet head is available and they do not have head stays.
I do believe these motors should have head stays and I will be looking into fabricating something that will work as a head stay.
You will also notice on a couple picture that the exhaust port has some grinding on it. This is because the port floor has been raised with weld because of the +6mm crank and the fact that the piston will be open to the crankgase area at top dead center. So at BDC the piston crown will sit slightly lower than the bottom of the port, but his is not a big deal because flow is most important before the transfers open.
Season has come to close for me and I have allot of things going on around the house so I am going to be pushing this project off for awhile to take care of them so I may not have any real updates for a while probably toward the end of winter before I get hot and heavy into this.
here the pics
The cylinder has been cut down 5mm on the bottom side because the piston was to far down the cylinder.
Calvin admitted to miscalculating the cylinder height
So we had to adjust it by removing 5mm of material.
It was spun on a large lathe and did it with a expanding mandrel to keep it square to the bore.
In some of the pictures you can see that the bottom of the intake floor started to window from removing so much material.
This gets filled with the spacer plate that will get shaped to the floor of the intake.
To avoid this their are a couple options.
-Use 86 cases, they are 5mm shorter than the other years.
I should have done this since I do own 86 cases but we did not realize that the piston was going to be 5mm down the bore on my 93 and had already relieved the cases for the larger skirts and the cases had already been relieved for the +6mm stroke on the crank.
Plus we didn't realize 5mm would take us into the floor of the intake.
Second option which I believe is going to be available in December is a different piston with the pin height moved 5mm.
The only bad thing is I do not know how many pistons he has ordered but I will bet that it will not be as many as he has for Sabertooth cylinders which is the style that I am running.
So in the far future you may end up ordering 10 pistons(min order) from wiseco if these cylinders don't take off for the cr500 guys and Calvin quits carrying them.
One advantage(in my opinion) of my setup will be the crankcase compression will be higher.
There were some questions before on the coolant inlet and outlets on these cylinders. I will say that my opinion is still out weather it will flow enough.
The factory inlet is about .680ish the cpi cylinder fittings are about .600 and look like .625 will be easily accommodated.
There is flow directed thru both the cylinder and cylinder head with most of it directed thru the head which makes the most since to me.
Cooling is not a large factor for me since I run alcohol but a gas motor would need some good cooling.
I think if I ran a gas motor for long lengths of time cooling would need to be addressed. I think I would talk to RK Tek about having him machine a head for this cylinder that would have large inlet and outlets.
I do not believe a dual outlet head is available and they do not have head stays.
I do believe these motors should have head stays and I will be looking into fabricating something that will work as a head stay.
You will also notice on a couple picture that the exhaust port has some grinding on it. This is because the port floor has been raised with weld because of the +6mm crank and the fact that the piston will be open to the crankgase area at top dead center. So at BDC the piston crown will sit slightly lower than the bottom of the port, but his is not a big deal because flow is most important before the transfers open.
Season has come to close for me and I have allot of things going on around the house so I am going to be pushing this project off for awhile to take care of them so I may not have any real updates for a while probably toward the end of winter before I get hot and heavy into this.
here the pics