Date: Thu, 6 Feb 2014 20:59:03 -0800
Reply-To: "SDF ( Scott Daniel Foss )" <scottdaniel@TURBOVANS.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: "SDF ( Scott Daniel Foss )" <scottdaniel@TURBOVANS.COM>
Organization: Cosmic Reminders
Subject: Re: air cooled 2.0 1981 Cylinder head temp?
In-Reply-To: <BAY179-DS14D7B6975774A240B1491DA0970@phx.gbl>
Content-Type: text/plain; charset=UTF-8; format=flowed
I see..
ok, good info.
40 yrs of VW air-cooled engines ..
never melted a piston ..
or even saw one.
Plenty of destroyed engine parts...but no melted ones.
On 2/6/2014 8:35 PM, Dennis Haynes wrote:
> After the engine is warm enough for the ECU to go into closed loop O2 sensor control the Temp 2 sensor no longer has an effect on mixture for any of the O2 sensor equipped Vanagons. For the 2.1L the ignition timing is changed slightly most likely to reduce the production of NOx.
>
> Since the air cooled engines can get the heads and pistons hot enough to melt both I would pay the extra for the Premium fuel to prevent detonation.
>
> Dennis
>
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of SDF ( Scott Daniel Foss )
> Sent: Thursday, February 6, 2014 9:17 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Re: air cooled 2.0 1981 Cylinder head temp?
>
> Vanagon Type IV air-cooled engines use the same single wire sensor.
> It's possibly to get corrosion and pore conduivity where it screws in to the head.
>
> 'as always' ..VW upgraded it in the next engine..the 1.9 WBXR ....with two wires to the ECT sensor ..one a dedicated ground.
>
> pretty sure it tells more that just 'engine is warmed up' ..it tells the ECU the temp of the engine, one input it uses to decide how long to hold the injectors open, in milliseconds.
>
> premium is not really recommended in my world....exotics yes ..VW's no..
> mid-grade is fine.
>
>
>
> On 2/6/2014 5:55 PM, Stuart MacMillan wrote:
>> My '78 van had a #3 cylinder head temp sensor in the casting as part of the FI system. I think it was there just to tell the ECU when the engine was up to temp, and it was often the cause of drivability problems. Did they remove it when they put that engine in the early Vanagon?
>>
>> Sometimes you can have more information than you can deal with effectively, and it just causes stress. Maybe it's enough to be sure your engine is in tune, run premium gas to (hopefully) avoid detonation at hot temps and forget about it.
>>
>> Stuart
>> Way too many VW vans in my past
>>
>> On 2/6/14, Glen Moon <glenmoonfl@hotmail.com> wrote:
>>
>>> Rebuilt 2.0 air cooled. Having mechanic put a Dokata cylinder head sensor
>>> under #3 plug, to gauge on dash. What should the temperture be?
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