Can anyone please tell me if there are any differences between an A+ and A series drop gear.

I have an A+ 1275 on a 4syncro box and am getting a nasty rattle from the drop gears.

Im running minisport straight cuts with 5thou clearance on the idler gear thrust washer. Primary gear clearance im undure of but was within specs. There is not any excessive crank endfloat but when I put my foot on the clutch the rattle goes away...

Any ideas would be greatful

Tia rodney

_________________
The best part of fixing your mini is the test drive

Minis..

1976 van daily drive
1975 van
1968 deluxe in the shed
1967 deluxe high strung 1310
1959 austin healey sprite

A+ gears are much finer teeth. They won't mix & match, you need to run one set or the other. A+ maybe quieter, I dunno.
Primary gear rattle is most common when running a big cam with a light flywheel. Increasing idle speed helps.

_________________
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.

Ah cool cheers doc.. im running normal a drop gears. She also has a 286 cam and med lightened flywheel.


Cheers

_________________
The best part of fixing your mini is the test drive

Minis..

1976 van daily drive
1975 van
1968 deluxe in the shed
1967 deluxe high strung 1310
1959 austin healey sprite

yes you`ll get a rattle because of the straight cut gears in the box,,, as soon as you put your foot on the clutch the gearbox gears basically stop turning,,, therefore the s/c gears stop chattering.

chattering away at idle with the foot off the clutch with a 6-speed dog box with s/c drop gear set is brain-draining

& yes the A+ gear-sets were produced to help keep noise at a lower level,,, different helical cut on the teeth specifically to help keep them quieter,,, but as the good Doc suggested they cannot be "Miss-matched

even if you tried you won`t get them to miss-match

also the A+ idler is a much larger diam shafts (either side) than the early A-series idler.

this goes with that at Susan

_________________
No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

Ahh Ha !
Now I understand the ad. Couldn't get the gist of mixing a skirt with a top and all that went with it, what did that have to do with the jingle ! Now you have explained it in terms I understand I now get the catch line !

_________________
'78 1275 LS (Under Repair, Dependant #1's car)
'72 GT Powered Clubman (Mine)... Under (re) construction