MicroSquirt.com read only forum (Jan.15,2018)

flyguyeddy,
I put a simple BOSCH water ccolant sensor in the heat exchanger nearest to cylinder (Citroën 2CV). Max temperatur is not more than 70°C.
http://megasquirt-de.serviceline.ch/suc ... r-mini.jpg
This place is good for coldstart warm up enrichment but not perfect for fastest response when you'll use it as gauge for danger driving conditions. The time delay is 5 to 10s.
Another slight disadvantage is maybe that it cools faster down than combustion chamber. --> The priming pulse is not perfect.

I guess best allround place is at cylinder head (fin) near exhaust valve: Representive starting temperature and short delay for warm up and extreme hot peaks.

»Horst

flyguyeddy wrote:what are you using for a "coolant" temp sensor and how are you running it? i thought that maybe oil temp would do nicely, but im sure it operates at a higher temperature than coolant.
anyone got any ideas?

you volkswagen people should chime in here

A buddy of mine runs his just under the cylinder heads in a small bracket or just hangs there. My old CIS thermo time switch was mounted in the pic below. It's not in the oil flow but it did gather the oil temp and motor heat. This is where I'll mount my new sensor for wam up. I'll just re tap it. My other buddy who is building a kit also with me will have his in the oil deep sump.

I used the stock vw head temp sensor and put a mini rotary pot from Radio Shack in parallel w/ the stock resistor (too lazy to take the resistor out). I then dialed in the pot to give me a reasonable temp range for descent tunablility within the range of the warm-up bins. Seems to be working nicely. Of all the methods (and I've tried most all of them), I think my next best choice would be the oil because the heads heat up pretty quick, almost too quick...

Regardless, if the range of your sensor isn't what you need, just throw a variable pot on there and if the curve is relatively close to that of a gm sensor, you'll be in luck.

Mike