Hi Kris, I checked, and mine is connected up to a tube on my 32/36 webber around the throttle level, so I believe its hooked up as you say. I checked it does indeed get a vacuum signal with the throttle opened ie advancing when the throttle is opened.
Thanks Andrew > Hi Andrew, > No, you need to the timing to suddenly advance when the > throttle is opened during acceleration, to help the engine accelerate. If > you had it the way you describe and set the timing in this state, the dizzy > will actually retard the timing because the vacuum that is holding the vac > advance will be gone. Make any sense. > Have you got yours hooked up this way? If you have then this may explain > your power loss/lack of acceleration when we were looking at your car. I > didn`t think to check, just assumed it was hooked as normal. > > > Kris. > ----- Original Message ----- > From: "Andrew Greenbury" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Friday, May 23, 2003 10:48 AM > Subject: Re: L20B Revving problem > > > > Hi Kris, > > > > What you are saying makes sense but I thought the vaccuum signal source > for > > distributor advance was the manifold, and so therefore the vaccuum advance > > signal was the reverse of what you are saying ie when the throttle is > closed the > > vaccuum signal to the dizzy advance is greatest?? > > > > Andrew > > > > > > > > The mechanics of your description makes sense Kris. If advancing the > spark > > > under wide throttle at low revs helps an engine perform better by > starting > > > the fire earlier, I can see why pinging becomes an issue for hicomp > > > engines. > > > I have never had a problem with a dizzy in 40 years of playing with > > > engines, other than their drive components. I have had a couple of > > > "recurved" dizzys (balance weights altered and spring tension changed) > > > built for Holden sixes that worked well. Never needed to change and > > > Lseries dizzy - Ive always fitted Jap built Hitachis, original > equipment > > > on SSS engines. > > > > > > Rick Clough > > > Ph: 03 5172 2670 > > > email: [EMAIL PROTECTED] > > > > > > > > > > > > "Kristian Walsham" > > > <[EMAIL PROTECTED]> To: > <[EMAIL PROTECTED]> > > > Sent by: cc: > > > [EMAIL PROTECTED] Subject: Re: > L20B Revving problem > > > ribe.com.au > > > > > > > > > 23/05/03 09:16 AM > > > Please respond to > > > membersozdat > > > > > > > > > > > > > > > > > > > > > Vacuum advance means it "advances under vacuum". In the carby bore just > > > above the throttle butterfly (atmosphere side) there is a little hole > which > > > leads to the fitting that you connect the vac line to the dizzy. > > > > > > When the throttle is opened to accellerate, air rushes past this hole > > > creating a small vacuum in this hole where by advancing the dizzy. When > the > > > throttle is closed the vacuum is gone as there is no air rushing past > this > > > hole fast enough. > > > > > > What you are talking about is suits turbo engines. > > > > > > Hope this makes some sense and helps a bit. > > > > > > Kris. > > > > > > > > > > > > ----- Original Message ----- > > > From: <[EMAIL PROTECTED]> > > > To: <[EMAIL PROTECTED]> > > > Sent: Friday, May 23, 2003 8:54 AM > > > Subject: Re: L20B Revving problem > > > > > > > > > > > > > > My understanding of vacuum advance is that with lower vacuum i.e. > large > > > > throttle openings, it retards the spark to avoid pinging under load. > > > This > > > > operates independantly of the mechanical advance which is directly > linked > > > > to revs. > > > > Rick Clough > > > > Ph: 03 5172 2670 > > > > email: [EMAIL PROTECTED] > > > > > > > > > > > > > > > > "Chris king" > > > > <[EMAIL PROTECTED]> To: > > > <[EMAIL PROTECTED]> > > > > Sent by: cc: > > > > [EMAIL PROTECTED] Subject: Re: > L20B > > > Revving problem > > > > ribe.com.au > > > > > > > > > > > > > > > 22/05/03 08:41 PM > > > > Please respond to > > > > membersozdat > > > > > > > > > > > > > > > > > > > > > > > > > > > > I thought the vacuum advance works at idle when there is a large > vacuum > > > in > > > > the inlet manifold. Then as you open her up it becomes inactive. > > > > > > > > could be very wrong > > > > > > > > Chris King > > > > > > > > ----- Original Message ----- > > > > From: <[EMAIL PROTECTED]> > > > > To: <[EMAIL PROTECTED]> > > > > Sent: Thursday, May 22, 2003 6:33 PM > > > > Subject: Re: L20B Revving problem > > > > > > > > > > > > > > > > > > I cant understand why is there no mechanical distributor advance. > > > > Wouldn't > > > > > this would effectively "retard" the engine as revs rise? I thought > > > the > > > > > point of advancing the spark at higher revs is to give the fuel time > to > > > > > ignite. > > > > > > > > > > Rick Clough > > > > > Ph: 03 5172 2670 > > > > > email: [EMAIL PROTECTED] > > > > > > > > > > > ********************************************************************** > > > > > Any personal or sensitive information contained in this email and > > > > > attachments must be handled in accordance with the Victorian > > > Information > > > > > Privacy Act 2000, the Health Records Act 2001 or the Privacy Act > 1988 > > > > > (Commonwealth), as applicable. > > > > > > > > > > This email, including all attachments, is confidential. If you are > not > > > > the > > > > > intended recipient, you must not disclose, distribute, copy or use > the > > > > > information contained in this email or attachments. Any > > > confidentiality > > > > or > > > > > privilege is not waived or lost because this email has been sent to > you > > > > in > > > > > error. 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