I broke a 70 2L and the tranny had servo synchros. Broke, as in dismantled
and then crushed. The steel probably went to China and was used on a tool I
bought that broke upon first use - oh, it was slighlty rusted too :)
Mike
----- Original Message -----
From: "Thomas - Sweden" <csp311@telia.com>
To: "Steve Ehlers" <stevenehlers@charter.net>
Cc: "Mike" <datsun_sports@hotmail.com>; "Datsun Forum"
<datsun-roadsters@autox.team.net>
Sent: Wednesday, November 20, 2002 9:52 AM
Subject: Re: what is a syncro?
> 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
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