Question about...

[rrauscher at nni.com]

Tim,

I was wondering what cam you are running in the 350. (I think
you once posted a CompCams). Believe it or not, with the Isky
cam that I'm running in a 327, I am also running 42deg of
timing at WOT (~12.6afr). Aluminum L98 heads. The difference
in how well the engine runs going from 36/38deg to 42deg is
substantial.

I approached this value slowly and with caution. Apparently,
with this cam and the valve timing, it likes a lot of ignition
advance. I was surprised at my results. This is supposed to be
due to an early intake closing.

It will be interesting to get some true wot afr readings. . .

BobR.

>
>Sounds like I am doing everything wrong ....
>
>160deg thermostat
>AFRs at WOT similar to the STOCK AUJP chip (curve shifted, slightly higher)

>Mega Timing
>
>Oh well.  Guess if I did it correctly then maybe I would be faster?  Maybe

>my car will live longer?
>
>I tried less timing.  I tried less fuel.  I tried less timing and less fuel.

> The car really likes this setup.  And, with 12.2's @ 112 on the stock bottom

>end I am *-NOT-* complaining.  I have seen very very few L98s do this so 
>I must be doing something right.  Very good points made about longevity. 
> This is not my daily driver ... actually hoping that I run it into the 
>ground so I have a reason to build my 420.  So, longevity is not my goal 
>here.  I'll give the car what it likes in order to get the best times out 

>of her.  Admission: What it likes and what it -needs- may be two different

>things.  Understood.  But, it runs faster with what it wants.  I know several

>others with similar combinations (we compared bins) who are running in the

>11.8's/11.9's with a 383 all naturally aspirated (and those cars are daily

>drivers).  A good point is that I want to make is that these Air/fuel ratios

>and those timing numbers are only for WOT.  They are not for daily driving.

> They are not that way for 'normal everyday driving'.  My BLMs are about 
>128 across the board and the timing is conservative.  
>
>Somehow though ... I don't think that I am running that 'calculated' AFR 
>at WOT.  I'll know in the spring when I take her to be dyno'd and get a 
>WB on it for a couple pulls.
>
>Thanks for all the info and the heads up regarding longevity.  I appreciate

>all the info.  All very good points.
>
>Does anyone have a similar setup and 30lb injectors??  What pulse widths 
>are you guys seeing at WOT (at what RPMs)?
>
>Tim
>
>At Wed, 15 Nov 2000 22:08:32 -0500, "Bruce Plecan" <nacelp at bright.net> wrote:

>
>>
>>
>>That's what they do with the 160d Thermostats.
>>Notice how they normally are a let down, in measured performance, but 
>>still
>>are in business.  They exist cause the feel fast and joe average is 
>>happy
>>with that
>>Bruce
>>
>>
>>> Seems this would be a 'trick' that unscrupulous chip makers would 
>>use. fat
>>> top end and mega timing... risking the blueprint?
>>
>>> ----- Original Message -----
>>> From: Bruce Plecan <nacelp at bright.net>
>>
>>> > Also, have said rich and too much timing feels fast yet folks still 
>>do
>>it
>>> > all the time.
>>> > It just feels so good, folks do it.
>>
>>--------------------------------------------------------------------
----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org