i would have gone for F15 emulsion tubes, thats what i use in mine ----- Original Message ----- From: "Chris Howard" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, May 28, 2002 12:16 PM Subject: RE: twin weber settings
> Hi Chris, > > Your setup sounds like a decent starting point, if a little on the rich > side. Here's my setup for reference: > > L20B, 76 deg cam, .595" valve lift, big valves, big exhaust, 10.5:1 comp > > 45 DCOE 13's > Chokes: 36 > Aux vent: 4.5 > Main Jet: 140 > Air Corrector: 185 > Emulsion: F2 > Idle Jet: 50F9 > Pump Jet: 40 > Plugs: NGK BPR7EIX > B/B electronic dizzy > 15 BTDC > > I arrived at these settings after spending a day driving around with an > Autronic wide band A/F meter shoved up the pipe and a full set of Weber > jets, chokes, vents etc. to try things out. It is set up safely rich at > the moment. The hardest area to get right is the progression from idle > to main circuits. The major factors influencing this area are > progression holes, emulsion tubes and idle jets. > > I tried 38mm chokes which were marginally better up top but lost out a > bit down low. 34mm choked the top end too much. > > A major factor is which actual Weber bodies you have. The progression > holes which are uncovered on slight throttle are drilled into the body > and differ between different 45's. The carb has a number after the DCOE > (i.e. 45 DCOE 13) which indicates which progression holes the carb has > as well as some other minor differences throughout the DCOE series (i.e. > some carbs have idle air bypass passages whereas others don't, some > carbs have progression holes accessible via a removable screw whereas > others have a pressed in brass welch plug covering them instead) For > this reason it is advisable to use a matching set. I have found that the > stock progression holes in a 13 body are a bit weak and you need to > compensate by running one size larger idle jet (50) than really > necessary in order to cover the lean spot in the transition. > > But anyway, I'm sick of carbies so these are going on shortly: > > http://turbovan.com/images/efi1.jpg > http://turbovan.com/images/efi2.jpg > > Mick, your setup seems to be pretty rich, I bet if you put some bigger > air correctors in it would pull hard to 7000. Might be worth borrowing a > dyno and/or A/F meter. I had 150 airs in and it was running 10:1 A/F in > the top end... Going up step by step made it better all the way... Now > it's running a conservative 12:1 up top, and doesn't want to stop at > 7000 :) > > Cheers, > > Chris Howard > [EMAIL PROTECTED] > http://turbovan.com > > > -----Original Message----- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED]] On Behalf Of mick ralph > > Sent: Monday, 27 May 2002 11:30 AM > > To: [EMAIL PROTECTED] > > Subject: Re: twin webber settings > > > > > > Hi Chris > > I tried to get a thread going like this a while ago > > All those numbers sound 'ball park". The difficulty in > > comparing jettings is > > compounded by different engine setups. > > My L20 has big valves 76 cam and fairly open exhaust system > > My settings were > > Venturi 36 > > Main Jet 150 > > Air correction jet 150 > > Emulsion Tube F2 > > Idle Jet 45 F9 > > Pump Jet 40 > > Plugs BP6EY > > Std B/B electronic dissy - no vac advance > > 15 BTDC > > This set up is very similar to yours but recently because of > > discussions > > with terry and the list and some help from a guy called > > MOTACARB here in > > nerang, I now run slightly smaller mains #145 and much > > larger airs #190 > > with really good results. I'm also considering going up again > > with the air > > jets just to try it out. The engine revs much sharper now and > > doesn't bog > > down so much below 3500rpm, like it used to a bit. Trouble is it still > > doesn't want to rev right out to 7000 like it used to. I'm > > gonna build a > > better bottom end before i go any further here. > > For anyone interested in weber parts this guy at Motacarb > > sells airs and > > mains @ $5.00 +gst. > > Has anyone used an O2 sensor in a L20B with webbers? > > This new "no lead" fuel is a bugger for checking fuel mixtures. > > I'm sure Terry and Errol and co can fill u in on the more > > technical stuff > > chris. My information is mostly anecdotal. > > cheers > > Mick > > > > > > ----- Original Message ----- > > From: "Chris King" <[EMAIL PROTECTED]> > > To: <[EMAIL PROTECTED]> > > Sent: Sunday, May 26, 2002 6:38 PM > > Subject: twin webber settings > > > > > > > Hey guys, > > > > > > Ive got an L20 with extractors and twin webbers, not sure > > about the cam, > > > ive been told its an Ivan tie (?) works 72 deg cam. > > > 34 - 74 --- 35 - 655 495 valve lift > > > XO - XC - IO - IC > > > The engine seems to make power from about 2.5 - 5.5k. does > > this sound > > about > > > right for this cam? > > > > > > Also i thought i would check out my webbers and see what > > kind of settings > > > they had. > > > > > > Carby: 2x 45 DCOE 13 > > > chokes: 36 > > > Aux vent: couldn't get out. > > > Main jet: 150 > > > emulsion tube: F15 > > > Air corrector: 160 > > > idle jet: 50 F9 > > > acc pump jet: 50 > > > > > > haven't opened them up so dont know needle valves etc. > > > > > > Do these specs sound about right?Is there anything in the > > carbys that > > would > > > be holding it back from 6.5 - 7k? > > > > > > Thanks for your help > > > > > > Chris King. > > --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]/ ---------------------------------------------------------------------
