500 CC piston kit

[Alex]

I am building a 500 cc engine with bigger piston and cilinderkit.

[ds450power]

whos making these cylinders? 102mm bore? and what is the cost

[TNT]

We run a 495, JSR out of wichita, ks has them. We never epoxied down the port are you going to? In theory it should gain more Tq if thats what you want. We have a very torqued quad tunned for mx, around 50 hp 36 tq lots of throttle response and light weight it will tire you down if not in good shape. We held up fairly good to HON's, Suks, KTM's @ 60+ hp/38+ in Open A nats. I really think a stroker would have woke the bb up and made us more competitive but afraid of the reliability. Then again seen lots others blow bb motors too. We had a steel sleeve made, best way to go imo. CP piston.

[ds450power]

why run a sleeve and not a cast cylinder that has nickasil lining?

[soyo]

Quote: Originally Posted by ds450power

why run a sleeve and not a cast cylinder that has nickasil lining?

well cost is one, but if done properly it will last just as long....and im curious what compression you are running TNT?? most of my builds are close to 15:1...just didnt know whos done that yet and if it liked it or not, have you played with different deck heights on the can ams? seems to be .030" total squish is a good "safe" number on most other quads...not sure what the ds is from the factory as i havnt cracked one open yet but my list of goodies keeps getting bigger sitting here!!!

i also plan to test on a dyno every single part as i can, from bone stock to all out...i say by febuary i should have some good results...i am totally new to the can am stuff so lots of reading and studying first....lol

i also would like to see your dyno sheets before and after if ya wouldnt care to share, unless there in the dyno section? also just curious of what you have tested on the dyno? thanks, jerod

[TNT]

We run a 13:1 for reliability. Theres lots of pros and cons to plated cyls vs sleeve. We chose the sleeve due to cost got tired of replacing or plating cyls and we can always bore the sleeve up if it gets damaged.

[Alex]

TNT what do you mean by " We never epoxied down the port are you going to?"
What port do you epoxy?

[Alex]

I am using a nickasil cilinder 102 mm.
Only thing that slows down my work is that we are getting a baby as we speak. :-)

[TNT]

I was referring to the intake port, epoxy it down to gain velocity for better atomizing of fuel. The bb way I see it won’t see as large of an affect by doing this. Here’s my theory why:

Since more bb vacuum air volume is being displaced on the intake stroke the difference in pressure or delta P between the intake port and combustion can is smaller. More volume of air moves slower and when the volume of air in the cylinder moves slower the vacuum pressure is reduced. The no epoxy intake port is larger and moves slower too, pressure is reduced. So what we have here is two low pressure areas that do not want to move air to mix fuel effectively.

If you epoxy down the port properly into a cone that reduces pressure further, then the pressure will be lower at the port, combined with a higher vacuum pressure in the can results in a higher delta P, fuel atomization. Again, as far as delta P, the 450 will see better results than the 500 that has to move a larger volume of air slower, but I would wonder if since the 500 is moving more air volume if the effect is the same. I think the MAP sensor will also sense the increase in velocity and deliver more fuel, a larger injector, TB, would also make sense.

One could see better results on the compression stroke with a higher compression piston since the pressure in the can is higher. I would think decking the head would produce better results both intake and compression since the delta p is closer to the injector and intake port.

Congrats on the baby…Keep it away form racing so you don’t end up broke like me. J

[rrguy]

if anyone looking for a 100mm cylinder with cp custom piston an gaskets $675 or $600 ea for 2

I want to try 1 but IMO 97 bore an short stroke I would want to stroke before you bore, or combo stroke. Stroke has many benefits as long as you don't go extreme.1 IMO reliable, 2less risk of heat an 3 cylinder issues 4 The combustion chamber design for the original diameter 5 easy to get standard cylinder, 6 common pistons, 7 broad powerband. On a 05 450r 94mm with long stroke a bigger bore works great.

Yet if anyone looking for a 100mm cylinder with cp custom piston an gaskets $675 or $600 ea for 2 or makle offer.

I asked woods an rossier an they both said its allot of work trying to deck the canam better to just get a different piston?

The head has big long ports, with their angle, not sure much you can improve by just opening them up epoxy can help the velocity but also the flow by raising the floor an redirecting the port to flow through the intake valves better. So a head with better flow will be good for the 450 or 500. with fuel injection you don't have to worry about fuel atomization like on a carburetor setup, but velocity still fills the cylinder better an the right port design help prevent backflow.