9 replies to this topic

[cooperd70]

I read all of your posts and replies on others posts with great interest along with your YT videos. Thank you very much for sharing your knowledge with everyone in the community.

My car is a 1990 998 that came fitted with the Cooper Conversion at point of sale (so Cooper stamped head, twin carbs etc). In the Cooper documentation that came with the car it states to run BP6ES plugs with a gap of 35 thou. I am about to replaces the current old set of BP6ES plugs and leads. Would you agree to the gap sizing? I had read somewhere else that the gap should be set to 0.81mm/32 thou on this setup.

Ignition is standard (inc ballasted system) with the exception of an Accuspark electronic module (kit 8 / 45D + Baseplate for 59D) being fitted in place of points.

If anyone else has experience I'd appreciate your comments

Cheers all

[ACDodd]

0.025”.

Ac

[cooperd70]

Consice and to the point. Thanks AC 👍

Edited by cooperd70, 01 August 2024 - 04:09 PM.

[ACDodd]

👍

Ac

[cooperd70]

AC - my car used to run perfect.  Since last years MOT its a right cow to try and drive around town at 30mph.  Pull out onto a A-road and it pulls strong through the rev range and up through the gears without issue.  Trying to keep it at 30mph in town/village on part throttle is the issue.

 

I noticed that when it was taken (not by me) for the MOT it initially failed on excessive CO and then passed again straight after.  I wasn't told this at the time.

 

I assume that they weakened the mixture off to pas the MOT and now its too lean?!?

 

It has twin 1 1/2 SU's and so its going to a friend who can setup/tune carbs, but how can I stop this happening again?  I don't want to have the car fettled each year after MOT time?

 

Cheers

[ACDodd]

It simply needs tuning properly, likely will need a pair of custom needles to fuel properly from legal idle tomteansion to part throttle.
What you’re describing is simply the carbs are not properly calibrated to fuel the engine at part throttle running. This is not fixed by rocketing up the mixture screws, properly profiled needles will sort this along with the correct springs etc.

Ac

[NWG13]

Hi AC another one for you as I’m new to this mini scene and is my first project car which I picked up from a friend so any knowledge would help.

I’m based near Heathrow airport and am looking for some contacts regarding tuning of the mini.

Back in August I was having issues with back firing. This resulted in a breakdown which led to the AA taking to the car to a garage thinking it was the distributor cap and arm. This was solved and replaced.

Another month goes by and still not running 100% and couldn’t get started without the choke. After another week at the garage got the mixture correct but found the carb was gunked up and needed an overhaul as was in a bad state with flats spots and stalling unless in high revs.

Which brings me to the last two weeks got a brand new hiff 44 SU carb for my engine swapped 1275 1980 mini and a new air filter. Fitted it all and now starts and runs but finding it has flat spots. In idle it will rev and then go back to normal. Took it on the road and 1st gear it starts slow like it’s about to stall then kicks till about 10mph. Then has to go into second. In second will reach 15 maybe before it flats and no matter how much you put your foot down it won’t go any quicker unless you move to the next gear.

Any suggestions on how to tune to solve this or anyone in the area as closest place to help is Croydon which isn’t ideal when it’s not running well.

[cooperd70]

Cheers AC! It'll need bringing along to you at some point

[ACDodd]

Ok the problem here is that the people you have working on the car do not know how to tune it.

You need this tuned properly to get the car to perform well/how it should. I am fully booked until July/august.

Take it to Downton Motor engjneering they are in reading and should be able to get the car baslined, however it will very likely need fully dialling in to get the best results.

Ac

Hi AC another one for you as I’m new to this mini scene and is my first project car which I picked up from a friend so any knowledge would help.

I’m based near Heathrow airport and am looking for some contacts regarding tuning of the mini.

Back in August I was having issues with back firing. This resulted in a breakdown which led to the AA taking to the car to a garage thinking it was the distributor cap and arm. This was solved and replaced.

Another month goes by and still not running 100% and couldn’t get started without the choke. After another week at the garage got the mixture correct but found the carb was gunked up and needed an overhaul as was in a bad state with flats spots and stalling unless in high revs.

Which brings me to the last two weeks got a brand new hiff 44 SU carb for my engine swapped 1275 1980 mini and a new air filter. Fitted it all and now starts and runs but finding it has flat spots. In idle it will rev and then go back to normal. Took it on the road and 1st gear it starts slow like it’s about to stall then kicks till about 10mph. Then has to go into second. In second will reach 15 maybe before it flats and no matter how much you put your foot down it won’t go any quicker unless you move to the next gear.

Any suggestions on how to tune to solve this or anyone in the area as closest place to help is Croydon which isn’t ideal when it’s not running well.

[Designer]

Hi,

 

Is there a group/anyone in the Surrey area that has booked AC for a tuning session and has spare spaces. for a bog standard 998cc.

 

Paddy.

Edited by Designer, 09 March 2025 - 08:18 AM.