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998Cc Engine’S Idle Speed At 1100Rpm


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#1 kmckmc

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Posted 16 July 2018 - 12:55 AM

This 1987 998cc Mini has gone through some upgrades.

MG Metro cam/electronic dizzy for fast road/flowed CAM4180 cylinder head/freeflow header and 1.75” exhaust/HIF36 carb

Now the idle speed is around 1100-1200rpm.

Is this expected?

Thanks.

#2 dyshipfakta

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Posted 16 July 2018 - 07:09 AM

Just adjust it down abit with the adjuster screw on the carb. If you can’t could be a small leak somewhere

#3 Retroman

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Posted 16 July 2018 - 10:22 AM

The idle should be more like 900/950

 

What needle have you in the HIF38 ?

 

Has the mixture and timing been set ?

 

It should have a dyno run to set it up correctly as it is modified and they are all different



#4 kmckmc

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Posted 16 July 2018 - 12:21 PM

The Mini should have done a dyno run, but it did not.

The adjuster screw was adjusted but the idle speed could not run smoothly at 1000rpm.

So, it is not true that using a fast road/race camshaft would definitely raise the idle speed?

I suppose a standard needle in HIF38.

Thank you.

#5 dyshipfakta

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Posted 16 July 2018 - 12:45 PM

Mg metro cam is pretty well mannered. You need fuelling set up properly. Worth checking for air leaks though




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