Clutch engagement to small spur gear ?

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Seandonato73 said:
Like mike mentioned, there are really just a few, but I wouldnt use the rovan for modeling specs, they have been know to be off.
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Damn can you measure one ?? the slot size in the spur gear ? I have it at 5.3mm wide. I made mine 5.4 just so there is more error tolerance.
evssv said:
..no..u can get hex...and the black bone style ?..u mean clutch bell??
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Uhhh ya clutch bell !
 
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Seandonato73 said:
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What is this off of ?? Mine has a diameter of 12mm !! not 15mm and the slot in the SPUR gear is 5.3mm , looks like I will need several adapters DAMN , actually I could make the slot wider for your size say 5.6mm wide and keep the 12mm diameter , I will have 2 large bearings on the shaft so there is no need to use the internal bearing on the clutch .
 

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Or just go with a name brand clutch bell and carrier as all are 54mm at the stock size option. When you bolt up each engine just use a paired clutch carrier, clutch bell,clutch and housing...should be the same ....may want to incorporate adjustable engine mounts into the dyno.....and what sean posted looks like a clutch bell from a losi...my 2.0 looks just like his in the picture
 
Rep732 said:
Or just go with a name brand clutch bell and carrier as all are 54mm at the stock size option. When you bolt up each engine just use a paired clutch carrier, clutch bell,clutch and housing...should be the same ....may want to incorporate adjustable engine mounts into the dyno.....and what sean posted looks like a clutch bell from a losi...my 2.0 looks just like his in the picture
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I think I have a solution , small adapters for various setups , I don't want to have to change out a clutch every time you use it.
the Wheel adapter (for brake HO ) has a HEX to fit a 24mm hex nut ( stock correct ?? ) then adapters that fit into the hex with a pin for direct to the motor , simple min. parts low cost.
 
Then do what you think will work for what YOUR building.....

To be honest how many engines do you think your dyno is going to see to warrant the time and money to have adapters made? I spoke to my neighbor that writes computer programs and builds robots we are going to build a dyno for my own personal car nothing else. So like I said how far do you want to go with this? A rolling bed dyno is standard for cars. Why because everything has tires and the dyno adjusts to different wheel bases if its awd. Your over engineering something that should be simple
 
Rep732 said:
Then do what you think will work for what YOUR building
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No don't get me wrong I appreciate the input ! that is a good idea BUT having to switch a clutch every time to me seems like a waste of time , but this is really for fun , I don't plan on selling it. This i why I asked about how many variations there are out there ! it seems there are more than I thought. and In that case your idea sounds better all the time so.

Is that side of the crank a taper with a key ? and threaded hole in the center ?
 
I added to my rant @buzzkill And @dougstar



And 54mm is and should be standard 5th scale size ...what im saying is if you mount a clutch carrier to your dyno everyone's 54mm setup will bolt to your dyno....also i would think you would want to keep your ratios the same with different engines so you don't have to adjust calculations everytime a new engine goes on
 
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Rep732 said:
I added to my rant @buzzkill And @dougstar



And 54mm is and should be standard 5th scale size ...what im saying is if you mount a clutch carrier to your dyno everyone's 54mm setup will bolt to your dyno
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Ahhh duhh , I did not get that , dammit now I got design more chit lol ! GOOD idea ! I like it .

do you mean the carrier and bell ? because the bell has the slotted part correct ? and now we get to how many carrier variations are there LOL ????
 
@buzzkill yes.... make your calculations around a set gear ratio and each engine will be the variable....if you have different gearing with engines at a unknown power how do you know if your going to have an accurate dyno? And don't forget you need an engine to calibrate it with....esp uses a stock zen that zen put out a claimed hp and he calibrates to that
 
Rep732 said:
@buzzkill yes.... make your calculations around a set gear ratio and each engine will be the variable....if you have different gearing with engines at a unknown power how do you know if your going to have an accurate dyno? And don't forget you need an engine to calibrate it with....esp uses a stock zen that zen put out a claimed hp and he calibrates to that
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I will have a rpm sensor on the main shaft , for wheel ( brake H.P. ) dyno you will have to add in the gear ratio into the math, for motor dyno it is a direct rpm/load calculation. Correct me if I am wrong please .
 
Direct drive doesn't need any calculations for gearing, just the correction factor.
Rep732 said:
Engine dyno im not sure of the math..but on a rolling bed they tend to put the car in a 1:1 ratio for accurate numbers.
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Then factor in rear gear ratio. A direct engine to dyno it a 1:1 ratio. That's how we did all the engines at the machine shop
 
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