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Stuartzickefoose Samba Post Whore
Joined: February 07, 2008 Posts: 10350 Location: SoCal for now...
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Posted: Mon Jan 21, 2019 11:40 pm Post subject: Thermostat fan controlled external oil cooler, replace flaps? |
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Hey all. Late model t4 engine.
I was wondering if I put a thermostat controlled external oil cooler in place, can I safely run without a thermostat on the flaps on the stock 2.0?
Thanks! _________________ Stuart Zickefoose
2011 Jetta Sportwagen TDi 6 speed manual
206-841-7324
[email protected] |
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SGKent Samba Member
Joined: October 30, 2007 Posts: 41031 Location: Citrus Heights CA (Near Sacramento)
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Posted: Mon Jan 21, 2019 11:42 pm Post subject: Re: Thermostat fan controlled external oil cooler, replace flaps? |
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yes. The cooling of the cylinders and heads is different than the cooling of the oil. _________________ “Most people don’t know what they’re doing, and a lot of them are really good at it.” - George Carlin |
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airschooled Air-Schooled
Joined: April 04, 2012 Posts: 12722 Location: on a bike ride somewhere
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Posted: Mon Jan 21, 2019 11:55 pm Post subject: Re: Thermostat fan controlled external oil cooler, replace flaps? |
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Flaps prevent over-cooling of cold heads, cylinders, and pistons. By allowing those parts to heat up faster, we achieve thermal homeostasis faster, when the engine expands to seal best, run best, and last longest.
The oil cooler, even thermostatically controlled, wouldn't manage the thermal expansion and warm-up of the engine metallurgy. We see this on a CHT and oil temp guage, since head temps respond instantly to load, and oil temps take a while to react to speed.
Your choice what to do here.
--
You'll always need the left flap in place, no matter what, on an air-cooled T4.
See "Type 4 Flap Trick" by Colin "Amskeptic," from his upcoming book.
The flap, in the "fully warmed up" position actually designates flow the oil cooler which would otherwise be under-cooled.
See ya on the road!
Robbie _________________ Learn how your vintage VW works. And why it doesn't!
One-on-one tech help for your Volkswagen:
www.airschooled.com |
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Stuartzickefoose Samba Post Whore
Joined: February 07, 2008 Posts: 10350 Location: SoCal for now...
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Posted: Tue Jan 22, 2019 2:03 am Post subject: Re: Thermostat fan controlled external oil cooler, replace flaps? |
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Figured. Thanks guys. _________________ Stuart Zickefoose
2011 Jetta Sportwagen TDi 6 speed manual
206-841-7324
[email protected] |
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Wildthings Samba Member
Joined: March 13, 2005 Posts: 50348
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Posted: Tue Jan 22, 2019 6:19 am Post subject: Re: Thermostat fan controlled external oil cooler, replace flaps? |
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If you are driving it during the cooler months a working flap system is a must. A cold engine will have more gas and water condensing on the cylinder walls and will be less thermally efficient. |
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orwell84 Samba Member
Joined: May 14, 2007 Posts: 2539 Location: Plattsburgh, New York
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Posted: Tue Jan 22, 2019 6:28 am Post subject: Re: Thermostat fan controlled external oil cooler, replace flaps? |
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I ran for years without a thermostat until a late fall camping trip where we let the engine idle a long time in below freezing weather to run the gas heater. After a long day of hiking we came back to find the crankcase full of gas and had to scramble for some oil and change it.
With the thermostat in cold weather, the oil temp will peg at 180. On cold spring or fall mornings, it really improves drive-ability after starting. |
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