Re: 16v tuning and timing questions...sort of long

["Sal" <pellom@YorkU.CA>]

Chris,

I would say that it's the timing which is off.  I had a similar experience
with my 8V and it ended up being timing.  Recheck it! HTH

Sal

----- Original Message -----
From: S.Coleman <deadbolt@mindspring.com>
To: scirocco group <scirocco-l@scirocco.org>
Sent: Sunday, July 08, 2001 8:21 PM
Subject: 16v tuning and timing questions...sort of long


> OK guys and gals,...here is the scoop.  I bolted a newly freshened up head
> on my car last week.   Here is the problem.  If the car is just sitting in
> the driveway running,...as soon as the rpms get to about 3800-4000rpms....
I
> get some hesitation,... sometimes a metallic "tanq" noise too.   Just one
> little "knock",.... almost like someone threw  a stone and hit a metal
> object.  (not a solid metal object,... kind of what you'd expect from
> hitting an exhaust pipe or something.......hollow metal I guess)
> Anyhoo,....under load , (when the car is going down the road), the car
runs
> Ok for the most part....    As soon as the rpms get to 3500.... no power.
> Actually a lot of hesitation and this car wouldn't get out of its own way.
> I've debated many things it *could* be with two other listers and this is
> what we came up with so far.
>
> 1.    Timing, timing , timing.   Either the cam-to-cam timing, timing
belt,
> or ignition.
> 2.    Plugged Cat. Converter
> 3.    Head has been decked to the point that I have changed the
compression
> to the point that I am experiencing *knock* and the ignition is be
retarded
> by the knock sensor .
> 4.    Broken parts in the head  (valve springs, bent valve, etc.)
>
> Now I did go back into the head and recheck all the timing values,...  No
> luck there
> I did take the car to a muffler shop that said the car is not a problem.
> (though they didn't actually remove the pipe and *look* inside to see
> Now as far as compression...hrmm,...  The head was cut 7 thousands when it
> was rebuilt.  There was also a 3 angle valve grind done and valve springs
> were installed @ 90lbs.  what I'm not sure is *how* much shaving is too
much
> in respect to changing the compression ratio.  I guess I'll throw in the
> fact that I live in Hell,...uhumm I mean South Carolina where it is 90
> degrees and about 115 with the damn humidity,...maybe that may play a
part,
> dunno?
> Lastly,...I never heard any damage happening to the head on initial start
up
> ,...so I can't see there being internal damage.   Besides,.... If I had
bent
> a valve(s) this thing wouldn't run *fine* at idle ,...right?
>
> Advise,..Ideas,...I'm open to anything at this point.  I just really,
really
> need to have a car to drive.
> Thanks and sorry for the length.
> Chris
>
>
>
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