K1 sounding rough
 

Anyone else's k1 sounding rough? Or just mine?:cry: at middle to high speed it starts, picked it up and when it gets to that point a horrible vibration goes through the car, I had a look and tried different things, and I've narrowed it down (i think)to the spur/slipper assembly, at that point I noticed if I held either side,(the nut on either side) it had 1mm play, is that normal? Also does anyone have ideas on what this could be?

Not the driveshafts rubbing on diff outputs is it??
When in your hand you will have lots of droop

Try your bearings one fit be on the way out?

Drive shafts not rubbing, car is brand new 1st use, so doubt bearing gone, but I will change and see, does no one else have that play in slipper assembly?

Tried changing bearing, also took both belts off and still the horrible vibration so must be coming from the middle somewhere :(

have you got your belts too tight?

Is it buckled wheels? Had this in the past

I thought the belts may be a problem so I took the belts off, still did it, so that rules the wheel theory out to. I appreciate all the help to, it feels like I've tried everything :cry:

Impossible to guess but most likely is a poor mesh between the pinion and spur gear. Try these first. Maybe a bit of damage to the pinion thats hard to see.

Try taking the front belt off and running it, this would tell you if you have a problem with the front. If its still vibrating take the rear off and reattach the front. If it vibrates with both then its the spur gear assembly.

yes
 

mine did. there should be a little play in the spur assembly but not to much. Loosen the belts and check the gear mesh, I stripped a spur 4th time i ran it so i guess it was a dodgy spur or something got in it. new spur fitted and all ajusted and much smoother/faster and quiet to.

anyone want to sell a K1?

have you also checked the motor for brg failure.

A lot of team drivers at our club didn't put the belt seperator fence between the front and rear belt on the layshaft. This caused their car to sound rough because the belts were rubbing against eachother.

I found it a little loud too but it wasn't the car it was the electronics. I don't want to mention the brand but I swaped out the new esc for a old one and less sound. Another thing I found was that my motor wasn't installed square to the spur gear so my pinion wasn't meshing well. All that being said such a large spur will always amplify the gears meching.

pm sent ...

I had that problem, with the slipper moving side to side. Just left it. I also had a terrible vibration, and I had noticed my rear belt tensioner had came loose, and im sure that the belt was slipping and making the vibration, make sure the locking nut is tight once the rear belt tension is set other wise it vibrates loose. The spur gear mesh sounds rubbish where ever it's set, I've put a durango spur in for now a lot quieter. Guna try the rw spur I think.

Name and shame Mr p!

Mine dont sound smooth, changed spur and pinion for new still no joy, belts fine motor bearings fine. Hoping Rw spur will cure.............

durango spur question
 

Hello all and especially rossi25rc,

Does a Durango spur fit without any modification?
Wich one did you use , the 102 one?
If so, does that fit because that's 4 teeth bigger than the
Schuey one.

Greetings

Hans

My K1 sounds very smooth and quiet. My layshaft does have a little float, which is preferable to it being tight in the bearings, so I dont think this float is causing the vibration.
I'd guess it is your spur / pinion combination. Is it a new pinion, and if so, it'll be worth trying different spur gear. Where abouts do you race?

They can sound rough if built incorrectly i think. I'm sure a slack or tight mesh will be the most likely cause.

Slack or tight belts could be a problem.

Also the belt seperator not being fitted or fitted incorrectly can cause a problem.

It is also possible to build the lay shaft up so the slipper plate locking pin is fitted incorrectly, this can cause noise and excess slipping.

Also a slack slipper will cause noise / vibration.

Overtightening the motor clamp or fitting a dirty motor can may cause problems.

I have to say after building / driving many different belt cars, this one has an excellent drive train and mine is super smooth and drives like a shaft driven car with an unbelievable amount of drive.

I absolutely love my K1...

Durango spur
 

I used an 87 tooth that a friend had spare as I stripped the schue one, no modifying went straight in, just buy a rw spur.

all tho I would like to know why there is such a big spur on the k1? Probly something to do with internal ratio? Someone explain it?

ratio
 

Hello all,

Yes, the big spur is there because of the internal ratio.
The K1 has a ratio of 1,8 hence the big spur.
What motor and pinion are you running with the 87 spur?
I think running stock is an option with a 87 spur, modified I think you
would need a 95/98 spur

Greetings

Hans

I'm runing 10.5 with 21 pinion.

Just a note on the RW Spurs that were tested at the weekend and run perfect, these spurs do not flex no where near the amount the Schumacher own brand do, also they are 4mm not 5mm thickness , these are also lighter than the Schumacher version, over a couple of grams and stronger. Sizes from 94 to 98 are available and will make smaller but as the discussion on ratio it may not be viable.

Please contact :

[email protected]

Thanks

i tested the new rw spur on my k1 sunday and like steve said it works perfect :thumbsup:

Are they any quieter than the stock spur gears?

Haven't run mine in anger yet but changing to RW spur at home certainly made it seam quieter when I tested in the garden. I've always used RW spurs in my cars when I can. And I like a nice quiet car :D

Who has these in stock ? Thanks

mine are very quite members at are club have said how nice and quite mine sounds while going round the track ive done 2 meetings running the new rw spur gears for the k1 cant fault them :thumbsup:

so its the spur gear thats the issue ?
Im using a schuy pinion on mine and its sounds terrible, im guessing the pinions are made by neal and the kit spurs in china!
Has anyone else noticed there front belt getting a little hairy on rh side like its rubbing on something?
Mines built as kit front diff shimmed one each side.

We have found with only one shim per side the diff will move side to side. Add shims to ensure not too much movement

Ive also just built a K1 for somone and noticed the front belt actually binds into the front diff outer covers....could the front belt of just been made a tad too wide? anyone found a cure for this?

you need to be 100% sure you have the diff side guards with the chamfer to the belt side

will need to check that...must admit cant remem if that stated that in the manual....great build and in the end only missing one screw lol

I done it other way round :blush:

Hi Guys just built my K1, and it sounds like a bag of nails. All electrics are new so now dirty motor or and grit ect in the car. The noise is coming from the Mesh on the spur pinion. the spur looks to have very blunt teeth it doesn't look to mesh well at all. It looks like the Spur gear has been poorly machined or cast.

If one plays aound with the mesh it will quieten down but not as quiet as one might expect. I think it is down to the Shape of the teeth on the Spur.

Its only doing laps round the living room at the moment.

So is it a case of needing a RW gear?

Yes it doe's theres a picture in the manual (step A9)

page 8 step 9A

Mine didn't run yet but is already noisy once motor and pinion have been fitted.

RW spurs will be quieter as always and going for a 95 might help
setting the mesh better, more loose but I think the alloy chassis does
act as a very efficient speaker.

Will report once set properly and run.

The car is amazing.