I've been watching this thread with great interest, although I have good
gears on my engine I'm relatively young and the gears might fare worse over
time, what about bypassing the chain setup entirely? Install a series of
gears that allow a direct drive of the cam. Yes, it is beyond my engineering
abilities, I wanted to see what you listers thought of the overall concept?
Relatively non-crusty landlubber,
Dirk
>From: Vicki Burrows <gregnvicki@earthlink.net>
>Reply-To: Vicki Burrows <gregnvicki@earthlink.net>
>To: Adam Bradley <ambradley@attbi.com>
>CC: "'Brian Hollands'" <Brian_Hollands@adp.com>, "Roadsters (E-mail)"
><Datsun-roadsters@autox.team.net>
>Subject: Re: A crusty marine engineers armchair solution to U20
>timingchains
>Date: Thu, 09 May 2002 19:17:27 -0700
>
>The problem with all this stuff is the development time... time is money.
>I have a
>source that could fabricate just about anything. However, when you compare
>$500 in
>gears to $45.00 an hour shop time, you don't get a lot of development and
>fabrication time. This is not an easy fix, and doing it right is
>paramount, as
>echoed by the "purchase valves and pistons" comment! I welcome continued
>research
>in this area, and I will continue to do so too. If you come up with good
>ideas and
>actual gears, etc and need a fabricator, let me know.
>Greg Burrows
>
>Adam Bradley wrote:
>
> > How about a single chain from the crankshaft to the camshaft and find
> > another way to turn the oil pump and distributor? I believe the one
> > supercharged car (who owns that car?) has crank triggered ignition and a
> > dry sump oil pump. How hard would it be to implement both of those with
>a
> > single chain? And would gears from an L-series be usable or adaptable,
> > since they must already have the proper crankshaft gear to camshaft gear
>ratio?
> >
> > At 10:35 AM 5/9/2002 -0500, Hall, Phillip wrote:
> > >I wish I had a U20 in front of me, but how about using the lower chain
>to
> > >jackshaft and cover from a 1600, then use a belt up to the head with
>the
> > >crank pulley on the dry side. The head would have to have a plate/seal
> > >around the cam to block oil. Head to belt clearance still may be an
>issue.
> > >Just an idea - Ok, back to my real job.
> > >
> > >Phil
> > >SEROC
> > >
> > >-----Original Message-----
> > >From: Brian Hollands [mailto:Brian_Hollands@adp.com]
> > >Sent: Thursday, May 09, 2002 9:47 AM
> > >To: Datsun Roadster Mailing list
> > >Subject: RE: A crusty marine engineers armchair solution to U20 timeing
> > >chains
> > >
> > >
> > >If you do that, add pistons and a set a valves to your next order from
>the
> > >vendors. Belts soaked in oil don't work for long.
> > >Brian '69 2000
> > >Tampa, FL
> > >http://web.tampabay.rr.com/oilleak/
> > >
> > >
> > >
> > >-----Original Message-----
> > >Therefore, all someone has to do is find the right toothed pullys
> > >from the right donor car that will fit inside the U20 front cover
> > >and then arrange a spring loaded tensioner mounted to maintain
> > >tension on the back (smooth) side of the toothed belt.
> > >
> > >/// datsun-roadsters@autox.team.net mailing list
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> > >
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> >
> > Adam Bradley
> > '70 Datsun 1600 Roadster SPL311-28181
> > '66 Datsun PL411 sedan PL411-022447
> > http://www.picturetrail.com/abend
> >
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>
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