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1.7 with Weber progressive; temp sensor options?
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lawryrg
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PostPosted: Sun Jun 26, 2022 9:42 am    Post subject: 1.7 with Weber progressive; temp sensor options? Reply with quote

Greetings, I'm seeking advice on options for a temp sensor / gauge to monitor cylinder head temp / oil temp on my 79 Westy. I've seen lots of temp sensor discussion for FIs but am seeking an option for my setup.
Any advice is greatly appreciated!
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crownline
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PostPosted: Sun Jun 26, 2022 10:02 am    Post subject: Re: 1.7 with Weber progressive; temp sensor options? Reply with quote

Cue can of worms opening.
I don't monitor head Temps but I have the drain plug temp sensor for my type 4 engine. I use it only as a Guage as to see what the average temp is over time. Is it the best spot? (cue the can of worms) It works for me.
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danfromsyr
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PostPosted: Sun Jun 26, 2022 10:31 am    Post subject: Re: 1.7 with Weber progressive; temp sensor options? Reply with quote

while true that the FI has a Temp-II sensor.. it's just a basic engine temp (is it cold or warm or hot) to calculate the needed fueling maps.

but a cylinder head temp gauge is independent of whether you have FI or a Carb..

if you want to monitor cylinder head temps.. do just that..

/open can of worms
now if you have Fuel injection and a cylinder temp gauge you can make minor adjustments to the fueling to reduce head temps by modifying and modulating the temp-II signal that the ECM receives with a potential meter..
/close can of worms
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Wildthings
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PostPosted: Sun Jun 26, 2022 1:59 pm    Post subject: Re: 1.7 with Weber progressive; temp sensor options? Reply with quote

Since progressives tend to run rich, versus FI which tends to run lean, a cylinderhead temperature sender is not as important with a progressive, but can be nice to have anyway.

Note: An oil temperature sender will not tell you much about the combustion process. Oil temperature tends to be rpm dependent, whereas head temperature tends to be load dependent.
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lawryrg
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PostPosted: Mon Jun 27, 2022 6:10 am    Post subject: Re: 1.7 with Weber progressive; temp sensor options? Reply with quote

Thanks fellas.

My objective is to monitor how hot the engine is running vice performance related concerns. Its so hot here in Florida I need to ensure my engine is as cool as possible. Exclamation

Can you recommend a specific oil temp and cylinder head temp setup that works well for you?
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Wildthings
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PostPosted: Mon Jun 27, 2022 6:34 am    Post subject: Re: 1.7 with Weber progressive; temp sensor options? Reply with quote

Set your timing to 28° BTDC (or maybe a degree or two less) at 3800+ rpm, hoses removed and plugged and use an exhaust analyzer to get you air fuel mixture to 12.5:1 or lower when at full throttle, and drive at night if the ambient temperature gets above 100°F during the day. That is about the best you can do. Also choose an oil like a 10w40 over a 20w50 to maximize oil flow through the cooler and go with synthetic because it can better handle the heat.
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SGKent Premium Member
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PostPosted: Mon Jun 27, 2022 7:10 am    Post subject: Re: 1.7 with Weber progressive; temp sensor options? Reply with quote

you won't be able to really monitor the engine other than trends. I pull oil temp from the sump on the taco plate because it tells me if I am pushing the engine too hard. I monitor cyl head temps on #3 how ever it is more for if an event like a plastic bag got sucked into the engine and covered the fan inlet. It also tells me if i am pushing the engine too hard. I also have a voltage meter, and oil pressure gauge. I tend to watch the oil pressure gauge more than any other gauge. As long as the engine has 10 PSI per 1000 RPM life is good.
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Wasted youth
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PostPosted: Mon Jun 27, 2022 9:16 am    Post subject: Re: 1.7 with Weber progressive; temp sensor options? Reply with quote

None of what I am about to say will answer your question, so just skip this blathering...

My understanding of Cyl. 3 temperatures relates back to the Type 1 engine before the oil cooler was moved away from the air path. I have read a few times of people with Type 4 engines continuing to express concern with that cylinder, but I am unclear why.

Monitoring temperatures is not something I do because I don't demand from the bus, beetles or vans any more than they are capable of, and that is done using Butt Dyno. Keeping ALL air seals, grommets and tin IN PLACE with the factory cylinder compression ratio, regular oil changes and valve adjustments, and keeping the engine tuned up has given me many miles of dependable service in a Mediterranean climate.

Having an adjustable timing light, the LM2 analyzer and The Samba people for advice and tips has resolved probably every mistake I used to do. I still have trouble now and then, and sometimes it takes awhile to figure things out.

Yesterday it was 104*f where I live and I drove the air-cooled Vanagon a lot and will soon take it in for a smog check. Not worried about anything.
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borninabus
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PostPosted: Mon Jun 27, 2022 4:06 pm    Post subject: Re: 1.7 with Weber progressive; temp sensor options? Reply with quote

an oil temp gauge is a great thing to have on an air cooled vw.
the "best" place for it on a T4 is the "taco plate".
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Wasted youth
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PostPosted: Mon Jun 27, 2022 6:16 pm    Post subject: Re: 1.7 with Weber progressive; temp sensor options? Reply with quote

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orwell84
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PostPosted: Mon Jun 27, 2022 7:24 pm    Post subject: Re: 1.7 with Weber progressive; temp sensor options? Reply with quote

I like gauges. I started with just an oil temp gauge and it was great for telling me when I was pushing too hard. I also have a cht and oil pressure gauge. Pressure gauge was useful for diagnosing a low pressure issue. Now I just glance at them from time to time. I think the #3 might run a little hotter because of flap for the oil cooler (on a type 4). Maybe not.
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