Spacer plates for EGT's

General engine tech -- Drag Racing to Circle Track

Moderator: Team

Post Reply

Spacer plates for EGT's

Post by RyonPro1 » Tue Aug 05, 2003 11:12 pm

Hello Mr. Stahl,
I had a question about the spacer plates that you put on to read EGT's before the headers. Do you need to place the probe in a certain place or area? Or are you just looking for a consistant readings. For instnace, if you had your engine on the dyno and had one reading with dyno headers, then had different readings at the racetrack with the race headers? Is that what your trying to get away from? That way with the spacer you can try different headers and get your EGT reading from the same source every time. Just trying to understand, I hope I was clear. Thanks for your time.
Shawn Ryon

User avatar
Site Admin
Site Admin
Posts: 1002
Joined: Mon Apr 21, 2003 2:43 pm
Location: Kalamazoo, MI

Post by speedtalk » Wed Aug 06, 2003 12:03 pm

I sent an email to Jere for as answer. Thanks, Don


EGT readings

Post by jere » Mon Aug 11, 2003 10:31 am

Hello Shawn,
The objective is to place the thermocouples in exactly the
same place relative to the exhaust valve for each cylinder.
There are numerous issues that can change the EGT readings
from the dyno to the race track. First of all, optimum
jetting on the dyno is seldom optimum jetting on the race
track. Same for ign timing. The shorter the track, the
more the difference between dyno and race track. Fuel
distribution on the race track (tracks under 3/4 mile) will
never be the same as on the dyno. One of the advantages of
the thermocouples in a spacer plate, is the ability to
change headers on the dyno and not disturb the thermocouple
situation. Stahl Headers may have the only available dyno
data analysis software that allows you to see the EGT's
clearly due to the graphing method.

Post Reply