I may have missed a reply that fixed your prob, but to me it sound's like
cam timing is out, do you have an adjustable cam gear?
Craig
----- Original Message -----
From: "andrew smith" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, January 30, 2002 12:41 PM
Subject: Re: HELP - comp ratio
> Duncan,
> Has the combustion chambers been radiused and what heat range plugs are
you using.Did
> they use a high speed timing light to determine the total advance.What cam
is in it
> and do you know the close point on the inlet,sounds like the cam might be
to small
> for the comp ratio or just closing to early on the inlet.Maybe your right
and you do
> have to much comp but there's plenty of L series around with that much
comp running
> 34 or more ignition timing.What head are you using cause you maybe able to
squeeze a
> few cc's out of it by deshrouding etc.
> Andrew Smith
>
> SHILLITO Duncan wrote:
>
> > Hey guys,
> >
> > I know this topic has been visited over and over again, however after
> > much fiddling and experimenting I need a little more help.
> >
> > I have approximately 10.9:1 compression ratio in my 2.3L L series (full
> > house). The engine is pinging severely from about 4000 rpm onwards. I'm
> > using 98 ron optimax fuel with a total of 28 degrees advance timing ?
> > retarded to stop pinging, but is very sluggish.
> >
> > I believe my goal is to reduce the comp ratio to about 10:1, so I can
> > get maximum power using more advance of 36 deg. My options are: ????
> > 1. Remove the head and add the appropriate steel
> > decompression plate to reduce the comp ratio. However these extra
> > gaskets hinder the swirling effects required for optimal burning and are
> > likely to leak oil and coolant.
> > 2. If possible remove more metal from the head to reduce
> > the comp ratio. This may be expensive and also hard to achieve since the
> > head has already been shaved 30 thou and has 44mm inlets valves.
> > 3. Add toluene (methyl benzene) from shell & optimax at the
> > cost of about $1 per litre. (with webers this equates to about 7km/$ =
> > V8 territory hehehehehe).
> >
> > I have to pull the head off now anyway due to a water leak - so I need
> > some quick fire assistance if possible. I've just had a tune diagnosis
> > completed (using optimax) and air : fuel ratios didn't change or reduce
> > the pinging.
> >
> > Also, what cost and where can I buy some 36mm chokes for my 45mm webers
> > ???? I'm on the Gold Coast. I believe that 38mm are too large for the
> > stroker - max hp at 5250 rpm and I'm sure 36s will help with higher
> > velocities into the head (see ? bernoulli's theorem can be put to good
> > use). hehehe
> >
> > Thanks for any help.........much appreciated
> >
> > dunc.
> >
> > Duncan Shillito
> > Technical Officer
> > Reticulation Services
> > Gold Coast Water
> > Mob: 0414 180 775
> > e-mail: [EMAIL PROTECTED]
> >
> >
> >
> >
> >
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> >
>
>
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