hi Dalmeny

Re tooth count: 10 seems to be the new norm, with the advent of pre engaged in the mini. My understanding ( so others please feel free to correct) is the tooth count between 9 and 10 can both be correct, but the chamfer/shape of the teeth (should!!!!) be slightly different profile..... think along the lines of the different ratios you can achieve in drops gears 23/30/24 24/30/23 etc,,,

so theoretically the teeth count is not an absolute BUT this assumes the slight mods have been made so the teeth slot and mesh well.

so original starters and interia type replacements tend to be 9 teeth as per KLAS

the pre engaged types usually 10 teeth.

11 teeth,,,,,???? not sure , again not IMPOSSIBLE but not usual in a mini

all starter motors i have are pre engaged, and recount the teeth to verify. all 3 i have at hand have 9 teeth. all made in the 1990s type M79.

_________________
Rover 214 atm ....

If someone knows more about the relationship between pre engage / pinion count etc, it would be good to get more info.... KLAS's info seems to disprove the pre -engaged more likely to be 10 teeth theory.

maybe quite interesting, i searched for hi torque starters here in Germany. the only dealer who states numbers says his hi torque starters all have 9 teeth, no matter if for pre engaged or inertia ring gear. the difference is the diameter, 25mm for pre engaged, 29mm for inertia

_________________
Rover 214 atm ....

Been doing a bit of homework on the starter. It looks like what they use in some Toyota's with a suitable pinion gear to suit the application and obviously the mini mount screwed on the end. My Auto sparky has already come up with a pinion gear that is one millimeter bigger in diameter and a better profile match, still 11 teeth. Ring gear will be here in 8 days I'll get it fitted work out the pinion once the flywheel and starter are set up again.

_________________
Dalmeny

Did you get a response from MED, I have used them many times in the past and never had a problem with them or their products.
I am sure they would be willing to get it sorted.

Grant

_________________


100% Pure A Series Turbo
Morris - The Original RedBull Racing

Yeah, no problems with MED always quick to reply and receive goods within 8 days. Obviously they only saw pictures, but that's the right pinion gear as far as they use (with the 9 tooth and 29mm diameter). They couldn't see a fault just wear and tear. Hard to argue this far away. New ring gear 30 pounds plus 35 pounds shipping. The only thing I have to work out with the engineer is how we fit it. The original set up has 6 grub screws drilled and tapped where the ring gear meets the flywheel i.e half the thread in the ring gear and half in the flywheel. Or just tack weld in 6 places. The pinion gear can be sourced locally.

_________________
Dalmeny

All the `Matics had the ring gear just tacked on. Ditto the current Minispares light race Mini flywheel
If you weld it on, space the tacks equally and of equal length or you will have more metal removal to balance it.
I was amazed how far out of balance a brand new Minispares flywheel was recently.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Ring gear arrived today. Not bad 6 days from UK, order date 14/7.

_________________
Dalmeny

Better than auspost!

_________________
Zulu...

1967 mini Cooper S

I too have been getting "big noises" from my aftermarket starter. Mine's one of these.
http://www.powerlite-units.com/products/rac468/

Bearing in mind that it is for a Verto flywheel, the pinion is about 29mm dia. and 11 tooth.

The issue here seems to be the pinion clashing with the face of the ring gear, rather than taking the top of the teeth off the ring gear.

Interested to hear what people think of this particular variation on the problem!

_________________
'68 Deluxe w/Metro engine

Yeah same starter and pinion gear as mine. But, is your ring gear inertia or pre-engage. When ordering the ring gear from MED it had to be a pre-engage ring gear.

_________________
Dalmeny

Mine is a pre engaged ring gear, as it is a verto (and the power unit came with a pre-engaged factory starter).

_________________
'68 Deluxe w/Metro engine

First think I would do is power up the starter on the bench and make sure it is throwing out. If it is pull the pinion out and measure the distance from the mounting plate to the end of the pinion gear and compere the measurement from the flywheel housing to the ring gear. Or, jam the pinion gear out as far as it will go with a spacer, mount it back to the flywheel housing and have a look through the grommet hole with a camera.

_________________
Dalmeny

Thanks- - good idea - will do.

BTW It seems there is an inertia starter ring gear (107teeth) for Verto and a pre-engage ring gear (129teeth) (for Verto). My previous post suggested that a Verto flywheel was for pre-engaged only - which some readers would know is not correct. This is from the old Mini Kingdom catalogue....

_________________
'68 Deluxe w/Metro engine