con rod

[CrawlinClodKiller]

Seems like most blown motors are where the con rod breaks. I am looking into haveing some titanium con rods made. That way when the motor weres out you just replace the piston. My reason for doing this will be evedent eventually. I am going to see just how much power I can really squeeze out of a motor. If it works the way I hope I will post a complete build up that will probably blow alot of peoples minds.

 

[k0m0d067]

I have several broken motors, and yes, pretty much all of them have failed due to a con-rod or the con-rod boss/post breaks off of the crank...

 

[ShiftPoint]

Hi,

This sounds like it might be a good idea. I don't know much about these motors, not even sure what a con rod is except from pictures. What I am thinking is titianium may not be the best choice. Ti is strong for its weight but if you don't care about the weight of this part then there are stronger materials I believe stainless steel is stronger. I would at least look into what the best material is for this if you haven't already.

I had an idea fro a project something like what your talking about I was thinking about usng solid state cooling to cool the motor. Thermal electric cooling or peliter junctions they are mall chips that you can run on 12 v dc they get super colld on one side and really hot on the other if you reverse the poliarty the oppsite sides get cold and hot. I have wondered about mounting one or more of these on or in a cooling head (you could have a cooling head made to hole these) might just be able to keep the temp about anywhere you want it. Down side is they need a battery and they require a lot of power, not sure how long a battery would last but might be worth a try

http://www.google.com/search?hl=en&q=peltier+junctions

Good luck keep us posted,

John

 

[CrawlinClodKiller]

Yes I know all about pelts. I hadn't thought about useing them. I don't think it would be a good idea though. If the motor is hot enough to need a pelt to cool it, the problem with that is the pelt is really only gonna cool the head. The rest of the motor would still be way to hot. A pelt is only cable of transmitting a certain wattage of power translated to heat. You would need a very large/heavy pelt in order for this to work. Running off a batt would not be good. First off most batts can not transmitt enough current to support a pelt that size. Second even if it could the batt would not last long at all. You also would have the problem of lots of extra weight near the back of the truck, course if you mount the bat up front it would counter act it. As to the material of the con rod. The stock one is aluminum with brass bushings. I feel this is done to keep it light weight. The brass bushings are used because they are a soft metal so they give a little to lessen impact of the piston going up and down. Problem with that is that they wear out too. My solution to that is to find a small flat roller bearing that is designed to take the side loads like that and be pressed into the conrod like the bushing. Sorry for such a long post but I wanted to cover all bases. Beleive it or not I am very knowledgable on many subjects. heh heh

 

[ShiftPoint]

Hi,

Perfect, I didn't know what the con rod was made of, ti is almost twice as strong as ALU (if i remember right and weighs about 60% heavier. Sounds like the right material to me.

The TE coolers do require a lot of power, their low voltage high current devices, I don't know too much about how much cooling power they have but I would think it would help, like I said the down side is the power requirements I do know they take a lot of current. A good LiPo woud do the trick but I just don't know how long it would last.


I think I have a chip around here I might rig one up just for grins and see what it does someday. Another problem with them now that I think about it is he heat sink for the hot side of the chip.



John

 

[Jeremy]

Never had a condrod fail on me .. I did have a crank pin break .. that might be from the c rod tho not sure

 

[CrawlinClodKiller]

I think the pins break cuz the brass bushing gets worn then catches on the pin breaking it. Not sure just a thought.

 

[Jeremy]

Most likely what caused it