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] > > > > > ********************************************************************************* > This e-mail and its contents is confidential to Gold Coast City Council > and un-authorised use is strictly prohibited. > ********************************************************************************* > --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[email protected]/ ---------------------------------------------------------------------
