Hi .
Mr Peterson wrote the following email to the list almost 2 years ago. I am
about to face the same problem in fitting a 4 bbl manifold to a built 302 for
my Tiger. I tried to send the email direct,but it bounced back from the
target server as undeliverable(daemon) mail. I am forwarding it to the entire
list for the Tiger community's feedback.
<<Mailing List: Sunbeam Tiger Owners
Back to Index Next MessageDate: 31-Mar-1997 03:39:30
From:
Subject: Temp Senders
When putting a new motor in my Mark 1 Tiger one of the other changes
which I wanted to make was the upgrade to a 4 BBL carb and manifold.
Since I had COBRA manifold laying around I decided it would be a
good match to the new cam being used. One of the problems encountered
however, was the Tiger temp sensor would not fit into the smaller
sensor hole used on the COBRA intake. After having no luck finding a
suitable adapter for the sensor, I found a temp sensor used on other
ensor hole. Taking a resistance
measurement of both sensors at room temperature however showed a
difference in the resistance measurements so a check would need to be
made of the temp gauge readings vs actual temps to understand if the
sensor was giving incorrect readings while in use. Using a Type K
thermocouple and an Omega temperature readout the following data was
obtained.
T/C location- inside upper radiator hose at radiator connection (ie
after the thermostat)
Engine at idle
160 F thermostat used GAUGE READING T/C READING
START ---- 66
120 88
140 (60C) 102
155 118
170 166
176 (80C) 172
185 179
194 (90C) 190
200 196
212 (100C) 212
225 223
As can be seen by the data, the sensor is fairly accurate at the upper
ranges and the thermostat not being opened could account for the
deviation at the lower ranges. It appears that the above temp sender
is an acceptable replacement for the "real" Tiger sensor, at least on
a Mark 1, when a smaller sensor is needed. However, (time for the
disclaimer), I only tested 1 sensor and while it is probably
indicative of the lot, this has not been tested. If anyone has any
questions or wants to point out errors in my testing let me know.
A final note; I obtained the sensor from JAE in Santa Barbara 805
967-5767. They are Lotus specialists, but carry many British parts
that can be used on Tigers, (ie clutch and brake cylinders, SU fuel
pumps, oil gauge lines, fittings, sensors, etc), and are very
reasonable in price.
Jay Peterson>>>
I have three questions
1) The temp sender hole on the COBRA manifold,is that the same size that is
common to american cars Ford performance manifolds or was it an oddball size
from a real Cobra?
2)You described the placement of the themocouple. I assume that this device
adjusts the voltage the sensor sends and is somehow wired into the harness.
3)Is there a generic temperature sender that can be located in the same
manner as the thermocouple and completely assume the function of the sender
and enable the manifold hole to be blocked off? Would this be desirable?
Thanks for your input
Tony Frisbey
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