RE: inlet manifold

Wed, 31 Jul 2002 08:07:40 -0700

Title: RE: inlet manifold
Nick,
 
I presume that this engine runs sweet? If so then I'd be looking at the dizzy curve, cam shaft specs i.e. duration, overlap and timing etc and the compression ratio as to even perform respectably on 91RON with a L engine is unusual at best - I can't say I've even heard of anyone running on low octane before not that it's impossible. You can modify the total mechanical advance to only make 15-20 degrees or even less by welding the breaker plates and the advance slots, fitting dual springs etc or the mechanical advance might even be frozen and not moving at all. Add that to your 18 degrees initial advance (say 33 degrees total) and it might not mind 91RON but I'd be surprised if it performs as well as you'd like. Modifications to dizzies on performance engines designed to run all day between 5-7+K rpms are quite normal, but street driving is a bit usually a bit ordinary with these.
 
regards
Terry
 
 
How come I can run 18-20 degrees of advance without pinging (much)?
I have an L20 with S2 dissy and recently have added 32/36DGAV
And I only use regular unleaded.
 
Nick
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of [EMAIL PROTECTED]
Sent: Wednesday, 31 July 2002 1:15 PM
To: [EMAIL PROTECTED]
Subject: Re: inlet manifold

Hey guys

Would one of these webers give better power/economy than a pair of SUs? Running on a L20B?

RG

    ----------
    From:   Kristian Walsham
    Reply To:       [EMAIL PROTECTED]
    Sent:   Wednesday, July 31, 2002 12:16 PM
    To:     [EMAIL PROTECTED]
    Subject:        Re: inlet manifold

    Just a quick one Terry, is the standard jetting on the 32/36DGAV on the rich side for the L18SSS considering it came from a two litre Cortina?


    Kris.

      ----- Original Message -----
      From: Terry Rudd
      To: [EMAIL PROTECTED]
      Sent: Tuesday, July 30, 2002 9:53 PM
      Subject: RE: inlet manifold

      Kris,
       
      S1 Bluebird has about the largest runners and base holes of any of the L4 downdraft manis and a S2 Bluey could be the same but I don't know anything much about the technical specs of them. There isn't much to be gained simply by fitting a larger runner manifold unless the head ports are at least the same size, some A87 heads have 38mm ports. There are a few holes to weld up if you use a L20B mani as they have EGR etc - not hard to do though.


      Usually a 32/36 will run well with 12-14 degrees of initial advance on the Bluey S2 dizzy with vac advance connected and 96-98 octane so if it's not detonating then it's pretty close to where the engine likes. Usually going up hill at around 4000 rpm at WOT in 3rd on a 40 degree day will sort it out.


      regards
      Terry
       
       
       
       -----Original Message-----
      From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Kristian Walsham
      Sent: Tuesday, 30 July 2002 9:58 AM
      To: [EMAIL PROTECTED]
      Subject: inlet manifold



        Hi all,
               I have a 32/36DGAV on a L16 manifold on my L18SSS engine and seems too restrictive. I believe there is manifold from an L20B engine that is better suited. The head is an A87 but i don`t know if it is the larger or smaller port head.   Can someone tell me which car this manifold would be from please.

            Also, i have the elec. dizzy and was wondering if i set the timing at 14 deg BTDC will this provide too much total advance with the vac advance hooked up? The car doesn`t ping though.  I have two timing marks on the front pulley, one lines up with 0TDC and the other lines up with 15Deg BTDC is this the correct way to set up the timing? I have never seen this before on a factory engine.

                  I use Caltex Vortex Premium 96 octane.
         Sorry for rambling on.
        Much appriecated,  
                           Kris.

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