I should stop while I'm ahead...
Not enough coffee today....the crank gear has 20 teeth, the big
jackshaft gear has 40 teeth (correct 2:1 ratio established...) then the
rear jackshaft gear has 24 teeth, and the cam has 24 teeth, maintaining
the speed established at the jackshaft.
Is the small 24 tooth jackshaft gear common to another car? (and
therefore easy to come by).
If so, there's the beginning of the solution - a gear that has the
correct pitch and diameter. Get some machining done to adapt that
large, keyed hole to the cam, and there you have it.
If that small jackshaft gear is not common, go out and find an off the
shelf gear matching the pitch and diameter of the cam gear, and do the
same adaptation.
The first one won't be cheap (unless you have free access to an accurate
rotary milling machine), but it's not an insurmountable problem
I'm through.......
-----Original Message-----
From: Peter Long
Sent: Thursday, May 16, 2002 4:49 PM
To: 'roadster list'
Subject: Timing gears...still.
OK, now I'm thinking I'm being dyslexic...is the ratio between the crank
and the cam not 2:1?
According to the photo on Fred's site, below, there's no way this is
happening with the cam gear having 24 teeth, and none of the others
being 12 teeth
So, I guess I'll stop talking about this until I figure out what which
way is up!! :O
Sorry about wandering off that dead end, for those that were listening
to me
Pete
> -----Original Message-----
> From: corcoran [mailto:corcoran@bainbridgeisland.net]
> Sent: Thursday, May 16, 2002 3:53 PM
> To: Peter Long
> Subject: Re: Timing gears...again.
>
>
> Peter,
> from fred's site
> http://home.texoma.net/~sitsinwest/temp/tgears.jpg but I
> don't know which gear is which.
> Tim C
> 2 '64 1500'S
> ----- Original Message -----
> From: "Peter Long" <Peter.Long@ecologic.ca>
> To: "John Wightman" <johnwightman@shaw.ca>; "roadster list"
> <datsun-roadsters@autox.team.net>
> Sent: Thursday, May 16, 2002 12:41 PM
> Subject: RE: Timing gears...again.
>
>
> > yes, that should be correct, the 2:1 ratio (36:18) for the
> 2 gears, as
> > the cam runs at 1/2 crank speed.
> >
> > The timing chain can still be the same, even if the gears
> are different
> > diameters for the 2 cars - just would mean that the cam and
> crank are
> > spaced differently.
> >
> > So, anyone with cam gear handy to count teeth?
> >
> > > -----Original Message-----
> > > From: John Wightman [mailto:johnwightman@shaw.ca]
> > > Sent: Thursday, May 16, 2002 3:32 PM
> > > To: Peter Long; Brian Hollands; roadster list
> > > Subject: Re: Timing gears...again.
> > >
> > >
> > > Which chain is the same, the upper, or lower? I've got a
> > > 2002, but haven't
> > > had it apart yet - however, my haynes manual shows a large
> > > gear (36 teeth)
> > > on the camshaft that is driven via the chain by a small gear
> > > on the crank (I
> > > would imagine 18 teeth, but can't tell from the diagrams). I
> > > think you U20
> > > owners are out of luck... :-(
> > >
> > > John Wightman
> > > '66 1600
> > > Victoria, BC
> > > ----- Original Message -----
> > > From: "Peter Long" <Peter.Long@ecologic.ca>
> > > To: "Brian Hollands" <Brian_Hollands@adp.com>; "roadster list"
> > > <datsun-roadsters@autox.team.net>
> > > Sent: Thursday, May 16, 2002 12:00 PM
> > > Subject: RE: Timing gears...again.
> > >
> > >
> > > > Now we're getting somewhere!!
> > > >
> > > > So, anyone own a 2002?
> > > >
> > > > > -----Original Message-----
> > > > > From: Brian Hollands [mailto:Brian_Hollands@adp.com]
> > > > > Sent: Thursday, May 16, 2002 12:52 PM
> > > > > To: Datsun Roadster Mailing list
> > > > > Subject: RE: Timing gears...again.
> > > > >
> > > > >
> > > > > Anyone have a BMW 2002 cam gear for comparison? The 2002
> > > > > uses the same
> > > > > chain.
> > > > > Brian '69 2000
> > > > > http://web.tampabay.rr.com/oilleak/
> > > > >
> > > > >
> > > > > -----Original Message-----
> > > > >
> > > > > A more cost effective approach would be to find an
> > > > > off-the-shelf gear of
> > > > > the right diameter and pitch, and then machine it or a
> > > mating hub to
> > > > > allow the correct interface with the cam. This would
> > > also allow for
> > > > > adjustability of cam timing.
> > > > >
> > > > > /// datsun-roadsters@autox.team.net mailing list
> > > > > /// Send admin requests to majordomo@autox.team.net or go to
> > > > > /// http://www.team.net/cgi-bin/majorcool
> > > > > /// Send list postings to datsun-roadsters@autox.team.net
> > > >
> > > > /// datsun-roadsters@autox.team.net mailing list
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> >
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