idler gear chatter

[AndyB72]

[/quote]

What was the clearance on the idler gears & the primary gear out of interest & what grade of oil
[/quote]

I can't remember what the clearances are/were but they are with tolerance. The first time is just used cheap 20/50 to run it in, it now has MiniSpares 20/50 in it.

[AndyB72]

Thanks for your input guys, I'm running a MiniSpares steel road lightened flywheel, not the ultralight one.

I'm all for a bit or race car racket but this one is embarrassing and driving me mad

[swifty]

I am running a MED ultralight flywheel set up , straight cut drops and swiftune SW10 . On tickover 1000/1100 RPM it sounds like a bag of nails . Dip the clutch and the noise disappears… Shirley

[Smithmaps]

I have a newly built 1293, with a 544/643 cam, and straight cut drops.
It only has a mid range light Mini Sport flywheel, similar to the old S/T one.
It chatters like a girls 6th form. As expected.
Guy

[roger mcnab]

hi
my 750 bevel drive ducati was a noisy sod sounded like it would fail soon after being started but the mechanic said ride it and enjoy and fix what breaks when it does but it was a noisy engine and the fins did not help
cheers roger

[Spider]

If it was running an A+ Gearbox, there's always this - they are silent;-

[whistler]

If it was running an A+ Gearbox, there's always this - they are silent;-

Is this the setup on the Metro Turbo?

[Smiffy]

No but the photos from the Turbominis website......thats before it was doctored with pic's of a moke

[Spider]

If it was running an A+ Gearbox, there's always this - they are silent;-

Is this the setup on the Metro Turbo?

No, this is one I make. As best I am aware, the MT used a stock set up.

No but the photos from the Turbominis website......thats before it was doctored with pic's of a moke

Bhahahahaha,,,,,, more likely my photos ended up there !

[Smiffy]

Just like my pic's that you've doctored...........

[BAD942B]

If it was running an A+ Gearbox, there's always this - they are silent;-

Do they run about 0.003/0.004 thou preload

[Spider]

Do they run about 0.003/0.004 thou preload

When I make them, I set the preload between 1.7 and 2.0 thou. They don't need much.

[BAD942B]

Do you make them for non A plus idlers

[BAD942B]

A quick google search threw this up https://www.minimania.com/part/C-22G943 ... ncro-Pre-A

[BAD942B]

it also threw this up https://mk1-forum.net/viewtopic.php?f=3&t=36377
ZF 5 speed gearboxes from the 60s & 70s used a laygear with small taper roller bearings at each end with no problems but with quite a bit of preload

[Exminiman]

A quick google search threw this up https://www.minimania.com/part/C-22G943 ... ncro-Pre-A

Apprentley in administration https://www.minimania.com/msgThread/128 ... 20problems.

[Spider]

Do you make them for non A plus idlers

I can only do them for A+. I've looked long and had at the earlier types, but I haven't been able to find bearings with a suitable rating. As it is, those I do for the A+ have a custom bearing - not somewhere I wanted to go.

Thanks for the link to that from Mini Mania, I wasn't away they were doing them, though it's a little confusing when you follow the links to their Idler Gear, a Primary Gear comes up. I'm unsure why they say you have to use them, they are the ones with a floating bush that I'm not at all fond of,,,,

I'll also add that JKD many moons ago also offered an early type Helical Idler Gear with a dead axle and tapered rollers (Timken's I believe). They discontinued them after a short while which I suspect was down to short bearing life. As mentioned above, I can do these for A+ but only because I can fit suitably rated bearings, which protrude a little in to the machined bores in the cases for these bearings, which are considerably bigger that the early bearings. I can easily make these with bearings that will all fit in the Pre-A+ Gearboxes and Flywheel Housings, however, the bearings wouldn't match the rating on the needle rollers that they'd be replacing as so will give short life.

If you were to look at the S/C versions that have been around a while, these use a very large Cylindrical Roller Bearing, these are capable of taking big loads and of course, in this type of application, it's nearly all axial loading with next to no radial (thrust).

[MrNoo]

I have found even with the roller bearing drop gears they still will chatter, got one here with SC roller drops and it chatters away quite happily, I will add that all bearings were renewed during the build and it's cock on, I don't mind the noise, it does have a super light flywheel and a reasonably lumpy 8 port cam. I remember a lot of the Miglias chattered away when I used to race, my Se7en did too.