93 replies to this topic

[m1tch]

I have already replaced the dizzy cap from a spare dizzy I had all the internals in the dizzy like the points, arm and condensor are basically new and have been setup fine, the problems only started when I cleaned the carb lol

[jaydee]

as far as i remember ADE is standard for hif38 carbs fitted on 1275 engines.
Its too lean for your setup, AAU is a good starting point, then have a RR session.

[m1tch]

as far as i remember ADE is standard for hif38 carbs fitted on 1275 engines.
Its too lean for your setup, AAU is a good starting point, then have a RR session.

Cool when I had the carb off a while back to fit the exhaust, I went round to my mates, him and his dad tuned minis back in the day, basically he had a look at my setup and said that the carb wasn't standard and said it was off a 1275, im pretty sure its just a HS4 carb though, does anyone know if the ADE needle was the stock needle for a 998? Does that mean that my carb has been tweeked then? Its odd because its also got a ported head (professionally ported inlet and knife edged runners) but it seems to have come like that from the factory, was there ever any 'special edition' engines put into minis that had porting?

Edited by m1tch, 03 July 2009 - 02:54 PM.

[jaydee]

Checkmate, racing flame and racing green are limited editions available in a 'cooper garages' setup (jonspeed head, twin hs2 carbs, lcb manifold and maniflow exhaust).
Standard needle for 998 is AAC. ADE belongs to 1275 specs.

[m1tch]

Hmm well my car is just a mini city lol my mate did say that the carb I had was the replacement of a twin carb setup, but mine only had the nasty peeshooter exhaust choking all the power lol perhaps its a cooper garage engine dropped into my car and plumbed into the stock exhaust? How can I tell its a jonspeed head?

[jaydee]

All genuine cooper conversions have a plate in the engine bay and another one inside the car bolted to the passenger floor.

[jaydee]

Its odd because its also got a ported head (professionally ported inlet and knife edged runners)

How did they realise that has been ported? They've stripped down cylinder head?

[m1tch]

Its odd because its also got a ported head (professionally ported inlet and knife edged runners)

How did they realise that has been ported? They've stripped down cylinder head?

When the carb and inlet manifold was taken off to fit the new exhaust (I had the 1 piece inlet and ehxuast manifold) you could see that the inlet was smooth and ported and if you put your fingers inside, instead of having quite blunt runners, they were worked to a much finer end for better gas flow.

What colour are the OEM 998 engines? mine is yellow, both block and head, neither seem like they have been apart. I don't know what the normal colour they were sprayed in the factory?

[m1tch]

Just gone out and cleaned the plate on the engine (the 1 next to the thermostat housing) the number is:

99H791PZ 541987

and the only numbers I can see of the actual cylnder head: 14MI

Am I to assume that the 1987 at the end of that number is the year of the engine? if so, the engine was built 5 years into the future when it was put into my car when it was built in 1982 lol

[m1tch]

Just taken this off the guesswork site (after searching about engine codes on here)

Source Vehicle : Mini
Engine type & CC : A Series 998 cc Transverse mounted
Fueling :
Engine features :
Lucas 16AC alternator with -ve Earth
1974 requirements
Mechanical petrol pump
Gearbox features :
Std. Ratio Rod Change gearbox with Pot Joints
3.44:1 final drive
A+ Gear Ratios

[lrostoke]

You are definitly running the wrong needle

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

Enter AAM , AAU , AAA , ADE , AAC into there you will see the differences.

ADE is actually a weaker needle in a 998 then an AAC which is a standard 998 needle

I would try either AAA or AAM needle, very similar profiles.

[sazal]

Hi, Ive had a few problems with my carb needle in the past (along with everything else!)

It first started when I had a stage one added. The stage 1 kit I got came from Minisport and came with an AAU needle. It wasnt running right and I had it rolling roaded and they changed the needle for an AAA, which made it run perfectly. I then had a new carb and never changed the needle (my AAA had got bent in the old carb), but the Mini was running really rough again, so I bought another AAA needle and that did the trick. There was an AEM needle in the new carb (it was a hif38 for a suzuki SJ) and it was running horribly. Even though I had all the timing done it didnt work, but the timing had been set up perfectly for the carb, but not the needle. A straight swap for the AAA sorted the problem out straight away.

Id reccomend like quite a few people on here, get an AAA needle and go from there

Ooo yeah, my mini is a 998 too, pretty much standard but with a stage 1.

[m1tch]

You are definitly running the wrong needle

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

Enter AAM , AAU , AAA , ADE , AAC into there you will see the differences.

ADE is actually a weaker needle in a 998 then an AAC which is a standard 998 needle

I would try either AAA or AAM needle, very similar profiles.

Just tapped a few needles in (not literally lol) and it seems that the AAV needle minisports suggest in their stage 1 kit is only slightly richer than the current, the AAA or AAM needles are simular but much richer and it seems that the AAU needle that mini spares recomends makes up the middle ground perhaps I should get both an AAA and an AAU needle and see what they are like?

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[m1tch]

Hi, Ive had a few problems with my carb needle in the past (along with everything else!)

It first started when I had a stage one added. The stage 1 kit I got came from Minisport and came with an AAU needle. It wasnt running right and I had it rolling roaded and they changed the needle for an AAA, which made it run perfectly. I then had a new carb and never changed the needle (my AAA had got bent in the old carb), but the Mini was running really rough again, so I bought another AAA needle and that did the trick. There was an AEM needle in the new carb (it was a hif38 for a suzuki SJ) and it was running horribly. Even though I had all the timing done it didnt work, but the timing had been set up perfectly for the carb, but not the needle. A straight swap for the AAA sorted the problem out straight away.

Id reccomend like quite a few people on here, get an AAA needle and go from there

Ooo yeah, my mini is a 998 too, pretty much standard but with a stage 1.

Awesome, I will go with an AAA needle then ....then fit the 1275 and the weber carbs lol

[jaydee]

What colour are the OEM 998 engines? mine is yellow, both block and head, neither seem like they have been apart. I don't know what the normal colour they were sprayed in the factory?

Yellow its a factory colour for the later Austin/Rover 998cc engines. 1275 were red.