2.5 timing

[David Borg]

What is the max advance timing set by merc ?

Its a 1992 175hp 2.5 carb

thanks in advance

[tinker060]

Depends on a number of variables. Compression, grade/type of fuel and port timing are right at the top of the pile. I would think that 25 degrees BTDC would be about max for a stock motor. Best keep an eye on the top of the pistons for signs of detonation if you are fooling with timing and don't have a lot of experience in this direction.

Good Luck,

Jon Wright

[T-REX]

What da hell U no about a stock mota??????:eek: :eek: .........Now I see why yo stuff os so much slower den Prof O/Bs stuff!!!;)

[tinker060]

TRex, I thought the same thing when I was posting the reply but you did not have to point it out in public.:p

Jon

[David Borg]

<TABLE class=tborder cellSpacing=1 cellPadding=6 width="100%" align=center border=0><TBODY><TR title="Post 1035465" vAlign=top><TD class=alt1 align=middle width=125>tinker060</TD><TD class=alt2>Depends on a number of variables. Compression, grade/type of fuel and port timing are right at the top of the pile. I would think that 25 degrees BTDC would be about max for a stock motor. Best keep an eye on the top of the pistons for signs of detonation if you are fooling with timing and don't have a lot of experience in this direction.

Good Luck,

Jon Wright</TD></TR></TBODY></TABLE>
thanks but what I meant was what timing does the factory set the motor at as when I checked it was at 18 btdc is this the norm??

[drasticplastic]

Yep, 18* is normal then the high speed spark advance box will advance it more.

[David Borg]

<TABLE class=tborder cellSpacing=1 cellPadding=6 width="100%" align=center border=0><TBODY><TR title="Post 1035938" vAlign=top><TD class=alt1 align=middle width=125>drasticplastic</TD><TD class=alt2>Yep, 18* is normal then the high speed spark advance box will advance it more.</TD></TR></TBODY></TABLE>

Many thanks