me again... is it possible to fit a different grille on the round eye B310 instead of its original one? for example,could i fit a grille from another datsun?

ohh ok i see thx. so do you know where i could get such a grille?

Round-headlight grille was only use for 1979. For 1980 & up it changed to square headlights.

Only in Japan was the 'S' (sunny) emblem used.

A12 1979 grille:



A14/A15 1979 grille:



GX version:



Other countries used only some of those grilles. For example in North America only the A12 grille was used - on all 1979 models including A14-powered models.

this is the grille i'm talking about. this has the D emblem though.

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hi its me again with another difficulty... so here it is,i don;t really like the datsun B310 grille. i have seen another type of grille on the B310 but i can't figure out what they are called. they have the 's' emblem instead of the 'd'. and the fog lamps holes are situated in the middle of the grille rather than at the bottom. can anyone enlighten me please? if you know of any other good grille conversions that i can install on the B310 it would be really helpful. just to remind you, my B310 is with the round headlights.

thx alot everyone! :) i hope i'll start this project soon, almost finished from exams :D 2 jobs during summer and hopefully an a15 B310 soon! :)

A couple of things, the A-series be it A12 pr A15 will run 6000 RPMs for hours one end. Back when our coupe was a road car we did a road trip where the car was floored for 2 hours, then some stop and go for 45 minutes then floored for 2 hours, stopped for gas, then floored for another hour....................this continued for pretty much three days. Amazining we didn't get a ticket since we seldom went below 80 MPH. The engine had no issue whatsoever, your hearing may suffer but not the motor.

While smaller circumference tires will up the RPM's it may end up increasing the speed ever so slightly (think 2 mph) as these cars do hit the aero wall starting about 75 mph and the stock gearboxes have pretty big RPM gaps in them.

Get a moderate cam, port the head, install a Weber 32/36 carb, decent shocks some sway bars and 185/60 tires and have fun with it.


Tom

Benny that engine is pure SEX!!!!!!

> do you know where i would find the gx parts for the a15?

The GX engine parts are for the A12 GX engine. They can be used on an A15 engine.

A12 GX cylinder head is about equal to a ported A14/A15 oval-port cylinder head fitted with dual valve springs.

> So reducing the tyre diameter will not have a noticible decrease in top speed right?

Top speed in the B310 is limited by HP. The stock 80HP A14/A15 have enough power to push the car through the air to about 100mph. The A12, 65HP A14 and 67HP A15 only have enough power to go about 90-94 mph. Changing tyre diameter won't change how much power you have.

The other -- theoretical -- factor is the gearing. You should not rev higher than the engine red line (6000 RPM for a stock engine). With 3.7 gear and stock-diameter tyres, 6000 RPM is ~110 mph. With 3.889 gear it is ~105 mph. But the reality is there is not enough HP to go that fast.

The stock B310 tire diameter is nominally 22.8 inches for stock tire size 155/80R13. The optional tire 175/70R13 is 22.7 inches, practically the same diameter.

To reduce the tyre diameter you could fit 185/60R13 (which are perhaps the shortest 13" tires are currently available). They are 21.6 inches tall. These have a theoretical top speed of 99mph with 3.9 gears -- which sounds ideal for making the power peak at the top speed peak. It will take perhaps 4 miles of track to accelerate up to that speed.

This is all theoretical since no one has actually tested a stock B310 for top speed.

More practical reasons for changing the Final Drive Ratio for a street car (non-racing) have to do with acceleration (lower gears = quicker accleration) or fuel economy (higher gears = increased fuel economy). For a street car, who cares about top speed? Even in most forms of racing the highest possible top speed is irrelevant because there is not miles of road between corners to enable ever reaching such a speed.