Chain Heat Testing

[standfast]

Originally Posted by Gene

I believe that Brian King uses one piece chains and recommends to his customers that they acquire the tool (rivet master?).

Not the same thing. We are already using rivet masters. I am talking about factory built one piece chains that come in a closed loop.

I went out again yesterday with the car and put on another 100 miles or so. I was using the bilge blower I got to try out. It is putting out pretty good airflow over the chain but I still managed to burn up another masterlink. Was rolling at about 85mph for around 7-8 minutes. O-rings were gone after that. Unacceptable so it's time to go back to the drawing board. I think I am gonna change the gearing in the RPM. I think that could be a lot of the problem. I currently have 6.2:1 in the RPM and I can make my 1st gear useful again and slow down the chain. Hell, even my second gear is hardly ever used. I may try using something close to 4.5:1 and keep the car a lot lower RPM when running the high speeds. Not sure how much I can get away with before the low end take off starts to suffer. I guess I can simulate it right now by taking off in second or third. Shouldn't be a problem though.

[busasandrail]

Any room for some bigger sprockets and a longer chain? Thou I agree that slowing the chain down will help, Adding some additional chain length should also help.

[yoshi]

Originally Posted by standfast

Not the same thing. We are already using rivet masters. I am talking about factory built one piece chains that come in a closed loop.

I went out again yesterday with the car and put on another 100 miles or so. I was using the bilge blower I got to try out. It is putting out pretty good airflow over the chain but I still managed to burn up another masterlink. Was rolling at about 85mph for around 7-8 minutes. O-rings were gone after that. Unacceptable so it's time to go back to the drawing board. I think I am gonna change the gearing in the RPM. I think that could be alot of the problem. I currently have 6.2:1 in the RPM and I can make my 1st gear useful again and slow down the chain. Hell, even my second gear is hardly ever used. I may try using something close to 4.5:1 and keep the car a lot lower RPM when running the high speeds. Not sure how much I can get away with before the low end take off starts to suffer. I guess I can simulate it right now by taking off in second or third. Shouldn't be a problem though.

Any pics of your setup?

[standfast]

I can post some pics tonight but it is the same as what is in my build thread with a bilge blower above the CS sprocket with a section of aluminum tube that is smashed down to direct airflow over a larger area of chain.

Right now I am turning 9k at 85mph which is way too much. The black sinister car has about the same amount of reduction as me and is close in RPM as well.

Basically, if I can stop using first gear and just use second for awhile it would simulate going down from a 6.2 reduction to a 4.5 since the total reduction is almost exactly the same at 18:1 for those gearing combos. If I can get away with that I can move my top speed WAY up and cut down big time on the chain speed during the high speed cruising situations that is burning up the chain. It shouldn't be a problem but I am gonna go out and try starting in 2nd for awhile (esp in hairy situations) and see what happens. Obviously I don't need the car to run 150mph but it will keep my chain speed much lower when I am running 80-90mph.

If I switch to something like 4.5:1 in the box I will be running around 6500RPM at 85mph instead of 9000RPM. Should make a big difference in heat buildup.

[Gene]

Yeah, I know King customers make up chain, I was asling about the tool 'cuz I don't know what it's called.

How many links are you running and what size? I haven't found that. Slowing down chain speed should help too.

[bajaBrothers]

What does that do to your powerband? Are you going to be sacrificing power potential of the motor by keeping it in the lower rpm curve? Very interesting topic and great experiment.

[standfast]

It just means I will feel like I am starting in second gear from my current setup and everything will shift about a gear up so when I get into a 80-90 mph section that I would hold for a long time, I won't be spinning as much RPM.

[bajaBrothers]

sounds good, try it. I am going to try my 6:1 gears and see how my motor pulls it. I have the 8:1 right now and have gobs of low end torque but max out at about 86 mph. This is with a cvt of course.

[standfast]

Yeah, I have the 6.3 gears in mine right now and want to go to the 4.7's but he doesn't have them in stock right now and the gear cutter is having some health issues or something like that so I am kind of stuck. Anyone here have 4.7 gears for a RPM box that they want to get rid of? I want to make this change asap but it looks like I am gonna be waiting. Next race is on the 25th of this month so I don't know if I will have them by then either.

[pwerwagn]

Lets just stick a new chain on it for the race and turn the dripper system on and hope for the best!!!