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Carb 7 Port Head


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#16 Retroman

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Posted 07 November 2018 - 11:45 AM

Ask the IPCC they are trying that too  hahha

 

Sorry could not resist

 

No doubt you will be a lot more successful than they ever will

 

I have seen heaters for SU's to stop icing



#17 Bat

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Posted 07 November 2018 - 03:17 PM

Hi,

There was a recall of a certain motorbike a few years ago due to carb icing, they fitted heaters to combat the problem.

The fact the engine is warm seems to make little diffence to carb icing. The vaporising of the petrol causes a local drop in temperature which along with the high vacuum on part throttle separates the moisture out of the air.

Cheers  :proud:



#18 nicklouse

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Posted 07 November 2018 - 03:24 PM

yep carb icing. has very little to do with the external temperature. there have been 3 different heating systems that I have seen for the good old SU. don't know how good they were.



#19 stevegrabba

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Posted 07 November 2018 - 04:28 PM

yep carb icing. has very little to do with the external temperature. there have been 3 different heating systems that I have seen for the good old SU. don't know how good they were.

 

In my case the question would be...was it really carb/injector icing?  Or was it the positioning of the air intake sensor feeling cold and overfuelling?  I guess I need to look into the correction values and set them to zero, or maybe put a woolly hat on the sensor so it doesn't feel so cold.



#20 nicklouse

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Posted 07 November 2018 - 04:31 PM

 

yep carb icing. has very little to do with the external temperature. there have been 3 different heating systems that I have seen for the good old SU. don't know how good they were.

 

In my case the question would be...was it really carb/injector icing?  Or was it the positioning of the air intake sensor feeling cold and overfuelling?  I guess I need to look into the correction values and set them to zero, or maybe put a woolly hat on the sensor so it doesn't feel so cold.

 

depends where the sensor is and what it is meant to be monitoring.



#21 stevegrabba

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Posted 09 November 2018 - 09:56 AM

Latest update guys... I spoke with the guys at SC, and they were very helpful. 

 

The first thing they asked me to check were the major fuel correction multipliers, starting with values for the 'Baro Correction Multiplier', 'Air Temp Multiplier' and then the 'Coolant Temperature Multiplier'.  Apparently the SC setup monitors external air pressure/barometer changes and then corrects fueling accordingly.  So when I have been up on the moors at 1300 ft above sea level, that could have been a contributing factor as to why it appeared to be overfueling.   

 

So I checked the 'Baro' table values and they were nothing like what they should have been, so that's one thing crossed off the 'to do or check' list.  Only about 15 more fuel correction factors, tables and charts to check afterwards...

 

FYI - They thought that the potential for it to be a 'throttle body icing issue', wasn't impossible but very unlikely.



#22 Bat

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Posted 09 November 2018 - 07:29 PM

Hi,

It does take a good lump of cold air to do it, but as your engine temp had dropped to 75 from the 90 if should have been I'd say if must have got very chilly outside!

Or you need an 88oC thermostat in there...

Cheers 






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