Miata Mailing List: December 1997, Message #19
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From: 	Keith Tanner <keith@miata.net>

Subject: Re: Setting timing at 21 

Date: 	Mon, 1 Dec 1997 08:56:20 +0000



>        I was talking to my miata mechanic, I told him that I had the timing

>set at 14, and was considering putting it up to 18 since I am using 93

>octane all the time anyway, he said as long as I was going to run 93 octane

>gas then I could just go ahead and put it to 21, in his words, " You'll be

>amazed"



The timing on a Miata is a compromise between low-end torque, detonation

resistance, and hig-end power.  At least, that's what I've decided from the

various information available.



The further the timing is advanced, the more low end torque you'll get.

But your engine will need higher octane, and you'll start to lose on the

top end.  18 degrees may have more torque than the more usual 14, but it

also loses out on the upper end of the rev range.  21 would go further that

way - probably more torque, but your engine will not be happy revving at all.



I wonder - if you advance the timing enough, can you get the engine to spin

the other direction? :)



Keith

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