Triumph GT6 And Spitfire Message Board: Idling/Timing

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Idling/Timing

Posted by Louis on 6/25/2009, 11:03 am
70.51.172.87

Hello !

If anyone could shed some light over this, id'be much appreciated:

Haynes book specs indicates 4 ATDC degrees for idle timing on GT6 engines (USA cars).

UK's specs is 13 BTDC for 100 octane gas (!) and 7 BTDC degrees for 97 octane.

My '68 GT6 was shipped from the factory to Canada so I'm guessing it's a USA spec car, so idle timing should be 4 ATDC (the engine is original).

Now my questions:

1-Is there a different spec for USA cars depending on the octane rating used ?

2-I add a bottle of STP booster to every fill of 91 gas (best I can find around here). Now how does that excatly affect the octane level in the thank ?

3-Tried a Colortune plug and find out that the mixture is too rich, wich I suspected since all the plugs where fooled with black powder. Got that special tool to adjust the needle but turning it CCW doesn't change a thing. Any clues ?

Thanks !

Responses:

Re: Idling/Timing - Glen 6/25/2009, 5:09 pm
Re: Idling/Timing - Louis 6/25/2009, 9:13 pm
Re: Idling/Timing - Steve Smith 6/26/2009, 8:16 am
- Re: Idling/Timing - mark radz 7/13/2009, 7:01 pm
Re: Idling/Timing - Louis 7/14/2009, 9:12 pm

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--Previous Message-- : Hello ! : : If anyone could shed some light over : this, id'be much appreciated: : : Haynes book specs indicates 4 ATDC : degrees for idle timing on GT6 engines : (USA cars). : : UK's specs is 13 BTDC for 100 octane : gas (!) and 7 BTDC degrees for 97 : octane. : : My '68 GT6 was shipped from the factory : to Canada so I'm guessing it's a USA : spec car, so idle timing should be 4 : ATDC (the engine is original). : : Now my questions: : : 1-Is there a different spec for USA : cars depending on the octane rating : used ? : : 2-I add a bottle of STP booster to : every fill of 91 gas (best I can find : around here). Now how does that excatly : affect the octane level in the thank ? : : 3-Tried a Colortune plug and find out : that the mixture is too rich, wich I : suspected since all the plugs where : fooled with black powder. Got that : special tool to adjust the needle but : turning it CCW doesn't change a thing. : Any clues ? : : Thanks ! : : : : :

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