I have 'How to modify your mini' (Vizard) but unfortunately it dosen't
explain how to time the cam...just says how important it is!
Is there anyway I can check to see if it is way off the mark without pulling
the head?.....really don't want to do that for a while if I can avoid it.
Andy
>From: Bryan Vandiver <Bryan.Vandiver@eng.sun.com>
>Reply-To: Bryan Vandiver <Bryan.Vandiver@eng.sun.com>
>To: Bryan.Vandiver@eng.sun.com, trunkie@hotmail.com
>CC: spridgets@autox.team.net
>Subject: Re: fine tuning
>Date: Thu, 16 Sep 1999 10:27:05 -0700 (PDT)
>
>The problem with installing a new performance cam, is that during the
>machining process, they
>sometime get a little offset, from true 0. The other problem is that timing
>marks on or engines
>were never that precise to begin with. The cam you got should have come
>with some specifications on
>where it needed to set. The Kent Cam kit I got came with some very specific
>instructions, I belived
>my cam was supposed to be set to 6 degrees before true TDC of the #1
>piston, and when using the
>factory marking on the timing gears, it was actually between 12-14. To find
>true TDC, with the head
>off, I used a dial indicator, and rocked the engine forward and back to
>find TDC for piston #1. I
>had a timing disk mounted to my crank pully(came with my cam), and zero'd
>it to TDC, I then check
>valve lift on the the #1 intake valve, with the dial indicator to find out
>how much out of sync the
>cam was from the crank. To sync the cam with the crank, I got a cam gear
>offset key from MiniMania
>(they are local to me). The offset key, will change the timing 2X the
>offset of the key itself, so
>a 3-degree offset key changes timing by 6-degrees. In any case this was a
>fairly time consuming
>process, and took a little trial an error. but once it's done, you don't
>have to do it again unless
>you change cams. In any case, I'd recommend you get a copy of David Vizards
>book (Tuning BL's
>A-series engine), It has very through instructions on how do do all this,
>not to mention details on
>every possible performance modification that can be done to our engines,
>and evaluations of most
>products on the market.
>
>Regards,
>Bryan Vandiver (59-bugeye)
>San Jose, CA
> >X-Originating-IP: [203.101.49.220]
> >To: Bryan.Vandiver@eng.sun.com
> >Cc: spridgets@autox.team.net
> >Subject: Re: fine tuning
> >Mime-Version: 1.0
> >
> >
> >
> >If you have not 'timed
> >>the cam to true TDC, you are not taking full advantage of the
>capability,
> >>and even being off 2-3
> >>degrees on the a-series, can result in a lot of lost potential,
>according
> >>to Vizzards book.
> >
> >I couldnt quite get my head around the 'cam timing' thing.
> >So it's not just a case of lining up the dots on the timing gears?
> >I mean, to me there seems to be only a couple of ways to fit it, the
>right
> >way or lots of very wrong ways.
> >
> >______________________________________________________
> >Get Your Private, Free Email at http://www.hotmail.com
>
|