Yes we have used pressure tranducers and plug temps to tune with. Thats actually a funny story. we had three engineers in our shop and four laptop computers monitoring plug tip temperature, in cylinder pressure transducers and a multitude of other things. It looked like a gaming convention around the dyno room that day. Bottom line is, You cant tune off plug temp and you can learn some things with in cylinder pressure transducers but its an all consuming project and not one to be taken lightly. You really have to amass a couple months or years worth of data and only after you have a well established base line can you effectively draw a conclusion to any given changes. All to often we look at computers and software to give us the answers almost intuitively. Well, that just does not happen. With any new measuring device comes a learning curve and only after years and years of accumulated data and experiences are we proficient enough to make tuning changes based off that data.cboggs wrote:Wow,..
nice thread starting here, ..
Port shape Plays a significant role in the shock wave tuning
and it's effects.
Darin makes reference to shape, .. consider the difference in port shape from
a 23* small block head to a SB2.2 port.
The 23* is very low, has sharp corner radius and some very severe changes in
shape and area. The SB2.2 on the other hand has a very gentle sloping port
to the valve with a large corner radius, no sharp bends and no
severe changes in shape. The SB2.2 has a much better shock wave pulse.
Darin, .. have you used the pressure transducers in the chamber to
measure chamber pressure?, . . the one that is built into a spark plug??
Can't the data give an indication of cylinder filling and shock wave effects?
As for test pressure, .. it's been hashed over and over here several times.
here's what I have found, .. I use the standard 28" for most tests, ..
and sometimes do a second test at 40" to check for turbulence.
I didn't find any use flowing above 40" for anything, .. I tried over 50" on
some DRCE stuff and SB2.2 and didn't really find anything, ..
in fact buy following the turbulence is bad theory I hurt some heads.
Curtis
After three days of tuning, we where right back where we started. Just not enouph time to acumilate data to work off of. If you use them every day, they could be a great tool.
Nothing is as simple as it looks. Its always twice as expensive and takes twice as long as you originally thought!