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Hello guys,

I'm about to restart my rebuild engine which the followings species



1293
SW5
Twin HS4 with Swiftune trumpets
fully ported head
straight cut gearbox etc..

Can someone tell me the right needle choices ??

Thank you very much

Burlen recommended M as a starter for this spec to me

M is a standard needle for most stock Coopers, S's, and 1100s

H6 is very slightly rich for all the above

6 is quite a bit richer...

I'm guessing you have slightly raised compression, and, some cam in it too..I'm think #6s will be a better match for that motor.....

Any needles you select, will only be a starting point......It needs to be set up on a rolling road by somebody that knows what they are doing......Same for the Dizzy curve........

I hope you are planning on some good air filters, running without them, can trash a motor pretty quickly.......

I had 6's in modified according to Vizard HS2's (i.e behaved like HS4's) in my ex-Cooper S that made 73 hp at the wheels.

Hello Guys

Many thanks for your help

Can someone give me equivalent with swinging needles??

Thank you

Here some more pics of the little beast!

New HS4s come with AAKs (or at least mine did), which I would guess will suit a fairly standard 1275.

AAAs are a fair bit richer and are commonly recommended for a typical tuned 1275 with a bit more cam/compression/etc.

The AAA (swinging/bias) is pretty close to the 6 (fixed), just a touch richer in the middle. This is a useful resource:

http://www.mintylamb.co.uk/suneedle/

As above though, every engine is different and a proper setup on the rollers is the way to be sure.

Hello Guys

We gonna setup the engine with a AAA at least for the engine lapping

AC dodd was talking about the ABD ? which is leaner

I'm not looking for the top performance at the moment but to be safe for the first 500 miles

.....

Hello Guys

I think I will start with the AAV which is the leaner to avoid to wash bores

And maybe evolve to ABD after?