All first generation Z-cars sold in Europe had
the Servo type syncro and all were 5 speed OD.
Both "A" and "B" type of gearboxes. On the first
year of 280 ZX the 5:th gear had servo type
syncro. Like Steve write, they did wear out way
too quickly. I think they were not dimensioned
properly to handle the engine power or they
didn't use the right material in the rings that the
shift fork moved over the brake rings to change
gears. Those are always worn out in the gearbox.
Thomas
Steve Ehlers wrote:
> Hi Mike ,
>
> In laymen's terms , A syncro (Synchronizer) is used to Stop the main gears in
>the
> transmission so that the selected gear can be selected .Nissan used 2
>different types
> in Roadsters .
> The first style is an exact copy of the Porsche "Steel" brake band type .
> Also referred to as Servo Syncro .This type acts like a compression ring to
>lock the
> gear so that it stops .
> They are very "positive " in stopping the gear when new ,and are used in all
>Nissan
> Competition
> Racing 5 speeds ( They shift like "Butter"at very high RPM's ).However the
>draw back
> to the
> design is a high coefficient of friction ,therefore they wear rapidly .The
>other style
> used the
> last year of the Roadster 5 speeds and ALL other Nissan products from then on
>is the
> Warner "Brass" type .This type relies on conical interference angles to stop
>the main
> gears .
> They have long life and work reasonable good ,but are not that good at
>stopping the
> gears
> at high RPM's .Thus making it hard to shift them when driven hard or with High
> horsepower
> going through them .Using Synthetic gear lubes are the "Ticket" ! Also makes
>servo
> syncros last many times longer.
>
> Steve Ehlers
> 68 1600
> 69 2-Liter ( with solex )
> 73 510 2 dr "Brock Buster"
> 77 280Z Fairlady ( 610 hp ATW's )
> and 8 other Datsun / Nissan products
> www.risingsunperformance.com
>
> Mike wrote:
>
> > what is a syncro and what does it do in the tranny exactly? I was reading
>some
> > history on the roadsters and I guess new syncro's designed by Porsche were
> > used.
> >
> > thx for the lesson!
> >
> > mike
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