TheSamba.com :: View topic - non-FI head on FI engine

Mon Aug 18, 2008 3:24 pm

The engine in my '78 bay used to be fuel-injected. the PO's mechanic, some 20 years ago, replaced the heads (well, at least the left one), and used non-FI head instead. needless to say, the engine was converted to dual Solex configuration, and was abandoned several hundred kilometers later because it didn't work right.
I'm trying to rebuild the FI system, and I need to mount the CHT sensor (temp-sensor II).
Before you will tell me the obvious solution- I will not replace the existing head, and even if I wanted to, there are only 2 Fuel injected type 4 2.0L engines in this part of the world, and the other guy won't sell me his... shipping a head from the US to here, is a mess.

My Question is- Can I drill and tap M10X1 hole for the CHT sensor somewhere on the Head? Is there a place in a non-FI head with enough "meat" for the drilling? Has anyone done it before?

This is what the head looks like:

[img]http://www.jeepolog.com/forums/attachment.php?attachmentid=8058&d=1201375263[/img]

Many thanks,

Asaf.

(BTW, my resto thread in a language most of you will not understand is here- http://www.jeepolog.com/forums/showthread.php?t=21250 )

Mon Aug 18, 2008 5:22 pm

Hi Asaf,

Wow, that is an interesting link, the pics are cool though.

You can put the sensor where the later engines had it by enlarging the left front tin retainer screw hole just ahead of the manifold.

Keep at it, looks like an interesting project.

Tue Aug 19, 2008 4:15 am

If I get you right, the issue with this location is that there is no "meat" there- it is drilling into a fin, meaning the sensor will be in the air flow, not in the Aluminum. I fogured that I can use a chunk of Aluminum, make a slot in it, drill and tap it, and put the slot on a cooling fin, with the sensor screwd in. but this is m last option.

Asaf.

Tue Aug 19, 2008 4:44 am

asafk wrote: If I get you right, the issue with this location is that there is no "meat" there- it is drilling into a fin, meaning the sensor will be in the air flow, not in the Aluminum.

That's where the factory put the sensor on all late model US spec Buses. The sensor itself doesn't have all that many threads on it, so it doesn't need much to bite into. The stock location is best.

Tue Aug 19, 2008 3:18 pm

like this?
(I know that the picture is of somthing else, just trying to figure out the idea)

Do you have a picture of that later model head with the sensor location?

Asaf.

Tue Aug 19, 2008 3:46 pm

Here ya go, OG temp sensor II location on a '79 US spec 2.0L longblock.

Tue Aug 19, 2008 4:10 pm

Cheers..
:D

That's what I'll do.

Asaf.

Thu Aug 21, 2008 2:08 pm

the result...
drilled and tappet as shown above. I didn't drill all the way, only the 7.5mm needed for the sensor. that leaves about 2mm behind it, so it wouldn't be in the air flow.

Asaf.

Thu Aug 21, 2008 3:17 pm

Nice job, but there isn't any need to worry about it being in the airflow, the head of the sensor is anyway. If you notice from my pic, the hole is drilled all the way through.