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Aluminum Sprockets
Posted: January 23rd, 2011, 8:56 pm
by AlisoBob
I always run Ironman sprockets.... always.
But my XR650 has an aluminum Renthal.
So today I'm out riding my Hondapotums with Eric and Pecker, we stop... and I notice my chain is tight.... really tight.
It wasent like that when we left.
So I get home and its still tight. I go in and have dinner and come out to readjust it.... and now its fine.
Question? Could the heat of high speed riding cause the aluminum sprocket to expand enough to tighten the chain, which would cause even more heat, leading to even more expansion and increased tightness?
Weird, huh? Another reason to run steel sprockets......
Posted: January 23rd, 2011, 9:54 pm
by fastkart
I run aluminum sprokets on the kart, which I know is different, but still the same. I've never had a chain go tight, except when I get a bend in the axle which causes only a tight spot. I would also think any expansion would have to be measured in the thousandths of an inch. Hard to believe a sprocket expanding enough to mess with the chain adjustment.
I'd be looking at the adjustment stuff to ensure everything is staying tight.
Posted: January 23rd, 2011, 10:02 pm
by AlisoBob
I hear ya Karty, but your sprockets are much smaller, correct?
The sprocket felt warm to the touch, but it cooled... the chain tension decreased...
Weird shit...
Posted: January 23rd, 2011, 10:05 pm
by fastkart
Yeah, they're smaller, I run 26-29. They're also made of 'flavor of the day' aluminum, some if it's junk, some of it's decent. I've pulled them off immediately off the track and had to wear a glove to handle them and the chain has been good.
I agree though, weird.
Posted: January 24th, 2011, 7:19 am
by seanmx57
Oring or standard? I think you have a chain issue.
Posted: January 24th, 2011, 8:19 am
by AlisoBob
DID O-rang.
Heat is not going to cause the chain to shrink.
I ordered a Ironman .... done.
Posted: January 24th, 2011, 8:32 am
by Gmbond
Could the sprocket be out of round? Tight in one spot possibly...?
Just a guess here really
Posted: January 24th, 2011, 8:34 am
by seanmx57
Time will tell
lack of lube can tighten a chain up. Doubt that is the case with the oring though
Posted: January 24th, 2011, 9:03 am
by AlisoBob
Brit thinks I'm high....
I'm blaming Al Gava ... His koodies musta' rubbed off on me.
Posted: January 24th, 2011, 2:37 pm
by seanmx57
AlisoBob wrote:Brit thinks I'm high....
X2
Posted: January 24th, 2011, 3:24 pm
by pstoffers
seanmx57 wrote:AlisoBob wrote:Brit thinks I'm high....
X2
X491
Posted: January 24th, 2011, 3:32 pm
by MojoScojo
Posted: January 24th, 2011, 3:44 pm
by 2strokeforever
i just run them real loose, and everything works out great, except everyone with a bone tight chain telling mine is too loose
Posted: January 24th, 2011, 4:17 pm
by lewisclan
Ive riped teeth off of the rear more that once on the BRP
Posted: January 24th, 2011, 4:19 pm
by seanmx57
(10-6 m/m K)
Aluminum 22.2
so .00000222 is the Linear Temperature Expansion Coefficient
purdy small Id say unless you are running some super HOT sprocket..........
http://www.engineeringtoolbox.com/linea ... -d_95.html
Posted: January 24th, 2011, 4:32 pm
by AlisoBob
