Date: Wed, 23 Aug 2017 20:11:19 +0000
Reply-To: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject: Re: oil pressure problem on my 1983 air-cooled
In-Reply-To: <331031ca-7812-2652-6187-50d401b58ffc@picasso.ucsf.edu>
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If you still have the degree plate near the fan you should be able to see the timing advance as you rev the engine. On the Non California models just disconnecting the vacuum advance will change the distributor to centrifugal advance only and reduce the total advance available. Try that and see if you can set it to 34-35 at 3,500 rpm. Then just set the idle speed to compensate for where the ignition timing lands at idle. For the oil cooler it can be done with the engine in place. Just remove the fan housing to get the oil cooler off and fabricate a block off for the air ducting. I use copper tubing at the engine due to the close proximity of the exhaust and other hot parts. Aeroquip socketless hose from the oil thermostat to the cooler element, -08, (1/2").
Dennis
From: Christophe Guilbert [mailto:cguilbert@picasso.ucsf.edu]
Sent: Wednesday, August 23, 2017 1:50 PM
To: Dennis Haynes <d23haynes57@hotmail.com>; vanagon@GERRY.VANAGON.COM
Subject: Re: oil pressure problem on my 1983 air-cooled
Thanks Dennis.
You guessed it, I removed the ERG, Yes cylinder head is over 400 most of the time.
My van is a California model so the timing is 5deg ATDC, taking into account that I have no ERG, reducing the timing down to 35 degrees would means what ? 40 (35+5) ATDC or 30(35-5) BTDC ?
I have a secondary oil cooler in the front already in place , I just did not had time to connect it yet using PTFE stainless braided line and plate sandwich (with thermostat). I love your setting but it appears to me that you need to remove the engine to install it. I will certainly do that during my next engine rebuild. I will connect the second oil cooler this week, do I still need to change the timing knowing that the temp will be fixed ?
Thanks so much for the help.
Chris
On 08/22/2017 10:58 PM, Dennis Haynes wrote:
Your engine is overheating terribly. Your oil temp should be around 200 or lower. Cylinder head temps are probably well over 400. Most likely your EGR system is missing or not working. As a fix you need to get the ignition timing down to about 35 degrees total advance. Consider getting a real oil cooling system in place.
Dennis
Sent from my Windows 10 phone
From: Christophe Guilbert<mailto:cguilbert@PICASSO.UCSF.EDU>
Sent: Tuesday, August 22, 2017 7:29 PM
To: vanagon@GERRY.VANAGON.COM<mailto:vanagon@GERRY.VANAGON.COM>
Subject: oil pressure problem on my 1983 air-cooled
Hi guys,
I installed recently an oil pressure gauge in my vanagon (air-cooled 2L
1983)
in a hot day (100F) , my (very annoying ) alarms triggers all the time
when I am idling. the pressure is less than 5 PSI for an oil temp of
250-260F.
I notice that the oil pressure really diminish over oil temperature
which is normal but I am wondering if I am within the spec .
When engine is cool , I have a PSI of 45. I have 20PSI around 240F when
the van is cruising at 60-65MPH, it goes down to 15PSI at 260F while
cruising at 60-65MPH.
I think my oil pressure is too low , What do you think ? . Do you think
my oil pump is guilty ? , I went cheap by not replacing it when I
rebuilt my engine.
Do you also think that the low oil pressure could be the reason why I
have noisy hydraulic lifter when the engine is cold.
Thanks for any feedback
Chris
