Date: Tue, 24 Sep 2013 16:49:41 -0700
Reply-To: neil n <musomuso@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: neil n <musomuso@GMAIL.COM>
Subject: Re: Temp II Sensor, Engine Hot.
In-Reply-To: <5242128C.3070701@turbovans.com>
Content-Type: text/plain; charset=UTF-8
Hey Scott. Great tips thanks.
The symptom: very small amount of coolant leaking out of the expansion
bottle vent. Maybe the blue cap is failing but I've always wondered if
the paddle type coolant pump I installed is as efficient (in design)
as it could be. An image of the pump I replaced:
https://lh4.googleusercontent.com/-6jrPG6_niXU/TAvb5hXKSjI/AAAAAAAADLo/WBZgyw0nGL0/s721/Plastic%2520Impeller%2520.jpg
Looks like the "volcano" type impellers you refer to but you can see
the wear at impellers. From what I've read online, assuming this is
the original OEM pump, the vanes on this type of pump can come apart
when it gets worn out.
I'm not using the stock pulley. Coolant pump pulley is from a VR6
engine (to allow for a simple single belt "AC delete" setup)
I'll compare pulley diameters.
Based upon this from the Digifant Pro training manual:
------
"The coolant temperature sensor provides correction during engine
starting and warm up."
..... The resistance signal it produces is used by the control unit to
determine:
The amount of cold start and warm-up enrichment
Ignition timing and idle stabilization during warm-up
When the oxygen sensor, idle stabilization and full throttle
enrichment functions are activated"
-------
sounds like I drew some inaccurate conclusions.
So based upon the last line above, the ECU requires input from the
temp II sensor at all times?
Neil.
On Tue, Sep 24, 2013 at 3:30 PM, Scott Daniel <scottdaniel@turbovans.com> wrote:
> My digifant manual doesn't say anything about Temp Sensor II having no
> affect after engine is fully up to temp.
> I have never heard of anything like that, or ever had a reason to think
> that.
>
> Is there a symptom or problem you are working on ?
>
> yes ....the impeller wheel on the water pump can be various types.
> I never recommend the paddle wheel style ..
> only the 'volcano' shaped one - plastic or metal.
>
> on I4 engine conversion the water pump pulley diameter matters..
> too large and flow is not enough. Have not had a problem with too small a
> pulley and too fast flow or cavitation.
--
Neil n
Blog: tubaneil.blogspot.ca
'88 Westy http://tinyurl.com/c8rlw6p
'81 VanaJetta 2.0 "Jaco" http://tubaneil.googlepages.com/
Vanagon VAG Gas inline-VR Engine Swap Group:
http://tinyurl.com/d7gd5ej
