[Top] [All Lists]

Re: XR700/Advance Curves?

To: spridgets <spridgets@autox.team.net>
Subject: Re: XR700/Advance Curves?
Date: Tue, 27 Dec 2005 13:15:26 -0500
Sender: owner-spridgets@autox.team.net
Messing with the distributor is opening Pandora's box.  The vac. advance is 
set for a standard engine.  If you improve on that you will need to change 
the vac. advance (characteristics) to suit (good luck!!)

  Remember that Vizard is working on performance motors, the electronic 
ignition will improve spark performance and exact timing.  That allows for 
greater precision all round, and improves performance. - i.e. so both your 
statements are correct - it's stock and it's better!

I suggest you use the standard centrifugal weights as these work at rather 
low speeds and are standard throughout the range on 
cars/engines.  Distributor efficiency does itself not impact the advance 
itself, but could require and change in characteristics  (5.12.6) from 
standard.  Again, good luck in sorting out whether more or less advance is 
required more or less quickly.

I would remind you that the Mini Cooper solution to this problem was to fit 
a distributor without vac. advance, but again, its engine characteristics 
were different (?). There was a Mini Cooper spec advance, it would be a 
good place to start if the standard unit is a no go.

For a treatise on the subject: www.wolseley.asn.au/flying/fw1/tuning.html 
or www.austinhealeyclubnsw.org.au/ahoc_technical.html

Let us know how you make out!!


<Prev in Thread] Current Thread [Next in Thread>