Re: MAP signal dampening

[Tom Sharpe <twsharpe@mtco.com>]

232-244 @.050, 10 deg separation, 4 deg adv. Lotts of torque, Brodix heads on a
6" rod 406 SBC, 10.45CR +003 deck. No ping, 34 total wot, 44(+10) cruse, 20
idle-2K, retards under 2500 rpm w/ throttle application, 28deg@3500 all in by
5K, 2 deg retard @ 6K. NO EGR.  Tom

Programmer wrote:

> What kind of cam you runnin' ? Are you getting PING cold or hot ?
> What's your compression, FP, etc.....blah, blah....there's a lot of factors
> to consider, including EGR flow. Cold spark bias is 20 B, hot is 10B.
> The overall timing map looks generally normal, but WOT spk is limited. Tip
> in spark is also limited--
>
> Lyndon.
> -----Original Message-----
> From: Tom Sharpe <twsharpe@mtco.com>
> To: gmecm@diy-efi.org <gmecm@diy-efi.org>
> Date: March 13, 2000 8:54 PM
> Subject: Re: MAP signal dampening
>
> >
> >
> >Programmer wrote:
> >
> >> Advance is the big key--but that's just MO.
> >> Here's the rule of thumb I've used:
> >> Cam duration of 270--set initial to 12BTDC 700 RPM Idle
> >>                              280--set to 14 BTDC    1100 RPM
> >>                             290 --set to 16 BTDC    1200 RPM
> >>                             300   as high as 19 BTDC   1400 RPM
> >>                            310    18 to 20 BTDC.   1500 RPM
> >> Limited by hot starter kick of course <g>... Limit total to 34 if
> >> compression is raised. Higher compression can stand higher
> >> duration and lower idle RPM as base. Takes a lot of playing around--but
> not
> >> too much to nail it right. Optimum advance varies with engine
> design...but
> >> should basically be dialed all in around 3500 RPM.
> >
> >Do you need to set the timing back at tip-in to prevent ping?? (I would
> think so
> >- 20 deg at wot at 2k rpm seems a lot.)  rgds Tom (PS Mine does)
> >
> >
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