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Old 24th October 2006, 10:02   #16
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yeah...they replaced a shim in the carb which had worn out... but this was done in the prior service and had not solved the problem of jerking....
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Old 24th October 2006, 17:31   #17
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Quote:
Originally Posted by BMW
timing must have been advanced by 2 degrees to cater to high octane value of LPG.
Can you provide detailed info on this, I am using LPG for sometime but this is a new info for me
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Old 24th October 2006, 18:38   #18
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santhoshx, which car do you have and what model?
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Old 24th October 2006, 18:49   #19
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shim that was replaced, was it a rubber thingie?

and good diagnosis vacum advance tubes are notorious with the carbed cars and they tend to play havoc with timing

wrt advance timing, what i gather is maybe for better response with LPG the guys who instal usually advance to better the response
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Old 25th October 2006, 09:26   #20
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Quote:
Originally Posted by BMW
santhoshx, which car do you have and what model?
its a 1999 Zen LX fitted with a "Star Gas" LPG kit.
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Old 25th October 2006, 11:01   #21
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santhoshx, make sure that the timing of your car is advanced to 12 degrees. The normal setting for petrol is 10 degrees.
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Old 25th October 2006, 11:42   #22
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Quote:
Originally Posted by BMW
santhoshx, make sure that the timing of your car is advanced to 12 degrees. The normal setting for petrol is 10 degrees.
i'm running 12 degrees on my zen...does help provided u use higher octane fuel (i use 91)

cheers.
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Old 25th October 2006, 12:50   #23
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Yeah that's right. 10 degree setting is required for 87 octane fuel. For higher octane fuel its better to advance timing by 2 degrees.
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Old 26th October 2006, 17:47   #24
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Quote:
Originally Posted by BMW
santhoshx, make sure that the timing of your car is advanced to 12 degrees. The normal setting for petrol is 10 degrees.
Thanks , I will check this out with my workshop and let you know their comments
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Old 27th October 2006, 02:00   #25
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Question Higher octane, higher degree?

Quote:
Originally Posted by Rice_tuner
i'm running 12 degrees on my zen...does help provided u use higher octane fuel (i use 91)

cheers.
About what you said, a little off topic but if I use 93 Octane then do I further advance the degree on my car? I drive a OHC and use Speed 97
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Old 27th October 2006, 09:31   #26
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Quote:
Originally Posted by ankitahuja
About what you said, a little off topic but if I use 93 Octane then do I further advance the degree on my car? I drive a OHC and use Speed 97
Hi,

You cannot advance the timing on your car it is controlled by the ECM. They are referring to Carburetted cars.

Viper
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