The FS5C71A (long tail model) was used in the non-U.S market S30 models to 1974(?). Notice the flanged output, three piece case, two piece driveshaft and "eyelet" shifter mounting.

The later models (including U.S. Market used the FS5C71B. notice the 2 piece case, splined output and different shifter mounting.

That's great Victor, thanks for that. Yes, the g'box I have is the FS5C71B. Chris (Z kid), thanks also.

Well I'm pretty happy then, a good 260Z box for $70!!!

I was also fortunate enough to have the car run before I removed it, and listened very carefully through all gears for any noise; also listened for the dreaded whirring noise whilst in neutral, and all was good!

Just for some more info, particularly for Oz guys, the g'box oil filler bolt is located on the LHS of the g'box on 240K (C110) models, as opposed to the RHS on Z's.

Vic, thanks for the pics, great stuff.

James

Some great shots on that website...

(and it didn't beat an RX3, it beat two )

Originally posted by Victor Laury

Just to add, the other day one of the roadster vendors let me see a possible "works" head for a SR311 U-20 motor. This head was cast with injection ports directly into the combustion chamber and an additional boss at each port for injector hardware mounting. There was no question that these changes were cast as original instead of machined on afterward.

Nissan Motorsports, Gardenia, was Very interested in the head and took many photos and measurements, but could supply no history or source information. Since only one of these has surfaced, we can only assume it was an expiremental platform built by Nissan.

Alan, were any of the injection methods Nissan used you mentioned a "direct port" method? or were they all throtle body injection?

Hi Victor,

The Lucas 'sliding throttle' injection, and Nissan's own ECGI system ( both seen on four and six cylinder Nissan 'Works' race engines during the late '60's to early '70's period ) used a setup that had the injectors on the inlet manifold - and not directly into the head. In fact, the Lucas system just shot the fuel into a tapered pipe - so not really even a 'throttle body' as such.

However, at least some of these engines had non-standard head castings and I believe some of them ( notably the heads used on some of the works Monte Carlo rally Z's ) had the injector-type castings and machinings on them WELL before injection-equipped cars were made available to the general public.

We have to presume that Nissan were fairly well ahead of the game, and more experimental parts existed than we generally know. If they were actually racing with Injection in late 1968 then you can bet there was stuff in development before that which we may never have seen.

As for an injector-equipped U20 head, then I'm afraid I can't help with identifying it off the top of my head. I don't recall any of the works race SR's in Japan running on injection, but its quite possible that they might have tried it. I'll keep a look out for any period pics amongst my collection that might show injected roadsters.

Whatever the story, you can bet that if they made one then they made more. The head you mention would probably have had a fair few brothers and sisters if its a special casting.

Interesting!

Alan T.

Thanks Alan. Nissan's "tinkering" and race development is one of the reasons our marque has so much allure to me. It would seem that even before the influence of Prince Motors, Nissan never just sat back and let their products stagnate. I believe that's a reason why the Nissan/Prince combination turned out to be as potent as it did. Added "fuel to the fire", you might say.