A lot of work has been done in various forms of racing around tighter ring
packs, thinner compression rings, higher positioning of the rings, etc. in
an attempt to create the lightest piston and longest rod possible. I've even
seen pistons where the oil ring overlaps the piston pin opening. But keep in
mind that these are all racing motors that are probably torn down after a
few hundred miles of running.
The extremes of racing can be fascinating but also surprising in their cost.
I remember reading that Top Fuel drag racers throw all their valve springs
away after about 8 passes, and these are titanium springs that cost $10,000
a set! And of course they replace the rod and main bearings after every
pass. I think it was Kenny Bernstein who said in an interview that they read
bearing crush the way most people read spark plugs.
Gordon Glasgow
From: jeremy mayne [mailto:jeremymayne@msn.com]
Sent: Friday, April 10, 2009 8:24 AM
To: drlsmith@dccnet.com; gsglasgow@comcast.net; printner@att.net;
datsun-roadsters@autox.team.net
Subject: RE: [Roadsters] long rod (r16) stroker
I also believe the R16 rods are lighter than the U20 (I remember weighing
them when I was building my stroker, but I don't remember the weights).
They have a more slender beam than the U20s. This was part of my motivation
for lightening the U20 rods by about 30 grams each. In an attempt to get a
good CR with the forklift dished pistons, I actually considered using the
longer R16 rods and having the tops of the pistons machined down rather than
decking the block. It wouldn't work though, because by the time the pistons
were machined enough for clearance, the top ring would have been too close
to the top of the piston. Maybe it could be done with custom pistons.
Jeremy
> As far as the rods go though I was under the impression that the R16 rod
was
> lighter than the U20 rod, and that the shorter piston
> (shorter pin height because of the longer rod) should save a few grams
> also....??? The pistons in this case would be about 8 mm shorter in this
> case for the long rod stroker. I would expect a reduced weight with that
> much difference in pin height.........
>
> Anyone know what these rods weigh?
>
> Daryl
> ________________________________________
> Support Team.Net http://www.team.net/donate.html
>
> You are subscribed as jeremymayne@msn.com
>
> Datsun-roadsters mailing list
>
> http://www.team.net/archive
>
> http://autox.team.net/mailman/listinfo/datsun-roadsters
________________________________________
Support Team.Net http://www.team.net/donate.html
Datsun-roadsters mailing list
http://www.team.net/archive
http://autox.team.net/mailman/listinfo/datsun-roadsters
|