Date: Tue, 30 Oct 2007 07:54:04 -0700
Reply-To: Michael Elliott <camping.elliott@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Michael Elliott <camping.elliott@GMAIL.COM>
Subject: Re: Definitive test for Hall > ECU?
In-Reply-To: <472713CE.7000900@comcast.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Thanks, Ken. You're not the first to suggest that while 5* ATDC can make
passing emissions easier -- and in California that's always a
consideration -- better performance is available closer to, or past, TDC.
I do a lot of mountain driving and don't want to ping the engine to death
so I might not enter deeply into BTDC territory.
I am curious to see how getting closer to TDC affects the throttle bypass
screw adjustment. If 10 half-turns CCW from fully in is, as everyone says,
an unusually large amount to be needed in order to get the engine to idle
with the idle stabilizer bypassed, then something is fishy.
But as Jim Thompson offered yesterday, I tend to get obsessive about these
things, about poking too deeply into the corners where my ignorance is
darkest and chasing my tail. That's two metaphors, mixed, I think.
W/r/t the other things you suggested I might consider, my cylinders test
at 155, 155, 155, 135 and the manifold tests at 11'' Hg, which appears to
be the standard idle vacuum per Bentley's (inferred, see my top-rated blog
at http://camping.elliott.googlepages.com/poormileage). Others have posted
more inches of vacuum as being standard but I'm satisfied that 11'' is
pretty good. But thanks for mentioning them.
--
Mike "Rocket J Squirrel" Elliott
71 Type 2: the Wonderbus
84 Westfalia: Mellow Yellow ("The Electrical Banana")
74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano
KG6RCR
On 10/30/2007 4:21 AM Ken Wilford wrote:
> Mike, I usually set mine for 5-10 degrees BTDC. The 2.1l Vanagons were
> spec at 7 deg BTDC (if memory serves). The retarded timing setting for
> the 1.9l Vanagon is (I believe) a compromise for emissions testing.
> However I have set mine at 10 BTDC with much better driveability, power,
> etc. Never had any problems with pinging, or even getting through
> emissions tests (strict here in NJ).
> If you do this your idle should come up to where it should be without
> turning the screw to oblivion.
> Also you might want to check your valve adjustment. If the valves
> adjustment is too tight this can cause low manifold pressure (vacuum)
> and idling problems. A compression test would help in this area.
>
> Hope this helps,
> Ken Wilford
> John 3:16
> www.vanagain.com
>
>
> Michael Elliott wrote:
>> Hm. I already did all that. Had a friend check my timing, too.
>>
>> Bentley's says 5 degrees ATDC for the 1.9l (p. 24.18). Is there a
>> reason I
>> should be doing 10 degrees?
>>
>> --
>> Mike "Rocket J Squirrel" Elliott
>> 71 Type 2: the Wonderbus
>> 84 Westfalia: Mellow Yellow ("The Electrical Banana")
>> 74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano
>> KG6RCR
>>
>>
>>
>> On 10/29/2007 9:30 PM Geza Polony wrote:
>>
>>> 10 full turns is way way way off the mark. This is an indication of a
>>> problem. The first thing I'd check is the ignition timing. Free, too.
>>>
>>> Start by setting the timing, with the idle stabilizer bypassed, to
>>> 10* ATDC,
>>> hoses attached, 950 rpm. You should be able to get it to run fine
>>> with the
>>> idle stabilizer out. Then reattach.
>>
>
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