i have a 95 200sx manual, and well my car shivers when im in 2nd gear, i think i kno what it is but i wanna double check with yall first.
well a while back i did a power break burn out and tires stoped spinning when i shifted and next time i broke into the tranny the flywheel was blue and purple on spots and if i remember they might have had a high spot. could this high spot be causing it not to sit flush against the flywheel causeing the shaking. pluss on hard accel the clutch will start to smell but its not from the driver at least i dont think, i just think its from sitting on those high spots. tell me what you think appreciat it greatly
i have a 95 200sx manual, and well my car shivers when im in 2nd gear, i think i kno what it is but i wanna double check with yall first.
well a while back i did a power break burn out and tires stoped spinning when i shifted and next time i broke into the tranny the flywheel was blue and purple on spots and if i remember they might have had a high spot. could this high spot be causing it not to sit flush against the flywheel causeing the shaking. pluss on hard accel the clutch will start to smell but its not from the driver at least i dont think, i just think its from sitting on those high spots. tell me what you think appreciat it greatly
Blue and purple at spots? well I work in a metal shop and know from experience that when metal changes to those colors it's from too much heat. like for instance when I grind down a piece of metal if I hold the grinder on it for a while it will cause the metal to turn blue and purple cuz of too much heat. this also weakens the metal when that happens. I'd suggest replacing the flywheel and refrain from power braking cause that is really hard on the transmission.
I have a monkey that continues the post whoring through out the night. His next stop is Pete's house where i taught him how to judo chop cracka ass thugs
Blue and purple at spots? well I work in a metal shop and know from experience that when metal changes to those colors it's from too much heat. like for instance when I grind down a piece of metal if I hold the grinder on it for a while it will cause the metal to turn blue and purple cuz of too much heat. this also weakens the metal when that happens. I'd suggest replacing the flywheel and refrain from power braking cause that is really hard on the transmission.
Mitch
well that was a while back and there was alot of people it mainly had to do with showing off but i just take it easy now. well i was think about replacing it cause i have already had it resurfaced once so i dunno how mutch they can cut it. id like to get a lightened one but cant afford one maybe one will pop up in classifieds
Blue and purple at spots? well I work in a metal shop and know from experience that when metal changes to those colors it's from too much heat. like for instance when I grind down a piece of metal if I hold the grinder on it for a while it will cause the metal to turn blue and purple cuz of too much heat. this also weakens the metal when that happens. I'd suggest replacing the flywheel and refrain from power braking cause that is really hard on the transmission.
Mitch
Yes the blue and purple are oxidation and occur at high temperature. This will not change the properties of iron but it will for Steel if the steel has been temperature treated and quenched. This is normally done for springs, chisels, tool steel, Ring gears etc. I don't think this is done for flywheels as there is no need. I don't think this will in any way affect the flywheel strength.
If you just re-surface the flywheel I think it will be just fine.
The blue and purple spots are where it has been hardened by the temperature. If you can see it on the other side of the flywheel then its time for a new flywheel.
The blue and purple spots are where it has been hardened by the temperature. If you can see it on the other side of the flywheel then its time for a new flywheel.
You can only harden hi-carbon steel and the local machine shop tells me the flywheel is cast iron. So other than annealing the cast iron you have not done anything to it. The color change is just oxide growth, not a change in the bulk material.
This raises an interesting point, if the flywheel is indeed cast iron then it may have warped the same as brake rotors do when they temp cycle. This is just an idea, but it may account for the symtoms.
You can only harden hi-carbon steel and the local machine shop tells me the flywheel is cast iron. So other than annealing the cast iron you have not done anything to it. The color change is just oxide growth, not a change in the bulk material.
This raises an interesting point, if the flywheel is indeed cast iron then it may have warped the same as brake rotors do when they temp cycle. This is just an idea, but it may account for the symtoms.
Flywheels are machined, not cast. Annealing is the process of relieving stress in a material after a cold working process to restore strenghth and ductility while lowering hardness. Yes the color change is oxide. Steel=iron with carbon content between .1-.3%. Cast iron is iron too high in carbon content to be used for anything except casting procedures.
You're helping me study for my engineering materials class. (<--- there)
Flywheels are machined, not cast. Annealing is the process of relieving stress in a material after a cold working process to restore strenghth and ductility while lowering hardness. Yes the color change is oxide. Steel=iron with carbon content between .1-.3%. Cast iron is iron too high in carbon content to be used for anything except casting procedures.
You're helping me study for my engineering materials class.
Hi james,
A question for you, is the 240SX manual to Auto swap straight forward, no body or tunnels mods, just the obvious ??
Sorry didn't mean to stress you out.
Agreed the flywheel is machined, but the material is cast iron. I suspected this from the flywheels I looked at years ago, but called my local machine shop to be sure.
Your definition of annealing is very limited. I assure you we anneal material every day thats not Cold worked.
That is an example of annealing, not a definition of all annealing.
You can have a stressed material thats not been cold worked. Cast iron has this problem, hence my comment.
Your definition of steel is also very basic.
Steels that are heat treated are tool steels, and from memory the carbon range is different from mild steel. Guess you can look that up.
Cast iron is the common name for pig iron, as made by a blast furnace.
It is the starting point for ALL steels.
Yes it becomes a variety of steels with further treatment, including stainless steel.
You make it sound like a reject material !!!
So far I have not looked anything up, but I can and have access to PHD material scientist's here if you have a question you and I cant answer.
Hi james,
A question for you, is the 240SX manual to Auto swap straight forward, no body or tunnels mods, just the obvious ??
Sorry didn't mean to stress you out.
Agreed the flywheel is machined, but the material is cast iron. I suspected this from the flywheels I looked at years ago, but called my local machine shop to be sure.
Your definition of annealing is very limited. I assure you we anneal material every day thats not Cold worked.
That is an example of annealing, not a definition of all annealing.
You can have a stressed material thats not been cold worked. Cast iron has this problem, hence my comment.
Your definition of steel is also very basic.
Steels that are heat treated are tool steels, and from memory the carbon range is different from mild steel. Guess you can look that up.
Cast iron is the common name for pig iron, as made by a blast furnace.
It is the starting point for ALL steels.
Yes it becomes a variety of steels with further treatment, including stainless steel.
You make it sound like a reject material !!!
So far I have not looked anything up, but I can and have access to PHD material scientist's here if you have a question you cant answer.
Oh you're not stressing me out. I should have put a smiley in there.
I like learning about this stuff. If you have any insights I haven't learned in my class I would gladly learn it and don't mind being wrong about anything.
Yeah annealing is a stress relieving process... period. I'm just spitting out the definition I'm trying to remember for my final next week.
I don't know what the material is of the flywheel but I suspect that the heat spots on the flywheel have caused the material to harden in those spots. This makes the clutch clamp down on material that has different hardnesses so it creates the 'shivering' he's talking about... just my theory. And if its true and he can see blue on the back of the flywheel then no amount of machining wil change it.
Tool steel is name given to steels with special properties because of their content. Tool steels can be hardened but they are not defined by that characteristic.
You're right about the pig iron, but from what I gather, it really IS reject material. Going back the the flywheel, it may be cast from iron, but it probably isn't pig iron.
And for casting iron, it should not have any stress in it that needs annealing because in hot working there is dynamic recrystallization of the grain structure. Only in cold working is there deformation of the grain structure along the axis of cold working (creating anisotropic properties).
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As far as the 240 conversion... hmm... no idea because the auto on the 240 is computer controlled... There's some good writeups on Zilvia.net about it though.
Oh you're not stressing me out. I should have put a smiley in there.
And for casting iron, it should not have any stress in it that needs annealing because in hot working there is dynamic recrystallization of the grain structure.
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Well I know that cast iron blocks that were used for years are left for a year to stabilize before machining and brake rotors that are cast iron do warp because they are still annealing/unstable depending how bad they are.
Ok I called a PHD material scientist and he says the problem is the high carbon content of the cast iron forms acircular structures that re-distribute on temp cycling. This is why the cast iron is unstable.
So maybe stress is the wrong term in this case.
The secret to good components is in the heat treatment and cool down. ( I asked about Brembo rotors and if they could be better than OEM, I have a problem with my 2003 Pathfinder rotors..)
He also said machining the flywheel will be enough to remove the problem.
(<--- there)
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