noice wrote:I run open headers and only when I shift the powerglide do I ever see a flame come out of the exhaust. I don't think your idea of the EGT's not being accurate is right. I try to keep it at 1200F in the 1/4 mile and I record the highest temperature hit in the run. If you really need to tune it correctly, get an O2 meter and calibrate it to methanol and run it to like .90 lambda.
I'm not talking about flames coming out of the end of the exhaust.
What I said was, "You can be overly rich and the EGT will read high because the fuel is burning in the tube where the EGT probe is.
The probes are usually placed between 1 1/2" to 2" from the flange.
Mine are 2 inches from the flange.
Ordinarily if your temp is a little high you're a little lean and can adjust accordingly.
But if you're mixture is overly rich you'll see excessive heat at the probe.
In that case if you were going by EGT's alone you'd assume lean, tune it richer, further compounding the error.
That's what I was talking about with that guy from Texas with the Ron's system.
He refused to acknowledge that the plugs are read differently with methanol than gas and insisted it was lean when in fact it was rich.
He kept fouling plugs, eventually washing down the cylinders, gave up and sold the Ron's system.
I also set my EGT monitor to read the max temp on a pass.
My old motor seemed to like around 1175F or so but that had a full 2.5 points of compression higher and had domed pistons.
With the 130 pill in the fuel system this motor was running around 1200F.
Is anyone out there using an O2 sensor with methanol?
I seem to remember there's a problem there...I think there's an issue because of the oxygen that's already in the fuel but I'll look into it.
I looked into it before and but it seems to me there was an issue.
If I remember correctly that's why I didn't pursue it any further.
But, again, I'll look into it some more.
Thanks for the link.
Thanks for the info on the coating on the Autolites'
I'm not sure why NGK eliminated the gold coating on the grade I use.
I'll look for a Bosch catalog, sounds like a great resource.
Amen to "dummy at the auto parts store" comment.
I call it the "fast food autoparts" phenomenon...
Very cool on the lawn mower plug.
I never would have guessed that would work.
I've actually got one boot closer to the primary than I would like.
My chassis was built around a hemi.
Since I run a wedge I had to build my own headers and that's just the best I could do for that port.
I made the mistake of "bigger is always better" thinking and made the zoomies out of 2 1/2" diameter tubing! LOL
1/4" smaller would have made life way easier and cheaper but man do they look impressive. LOL
I built them with my little mig welder but I ground all the welds flush.
People will ask how I managed to get all those contours in one piece.
I even welded a Hooker Header tag on them to further confuse people.
It worked, more than once I was ask what part number that "set" was. LOL
Anyone else want to chime in?
Like maybe a mechanical fuel injection expert?
Do we have anyone on this forum who has a mechanical fuel injection business?
Hmmmm...seems to me we have someone on the forum who was in that line of work...
But at least my push rods are right...
Let's let bygones be bygones. I acknowledged you were right.