My Experience With Triple Webers

[gav240z]

40's on an L28 in this clip. Skip to 3:11 for the good bits.

It seems to go ok, but I'd say my 72 240z goes harder with the 44's and close ratio box. The 40's just run out of chop on the bigger displacement motors.

https://bringatrailer.com/listing/1978-datsun-280z-40/

 

[luvemfast]

21 hours ago, d3c0y said:

So you are saying SUs are better than badly setup Webers? 

I'm guessing SU's could be better than incorrect and poorly set up 40mm Webers...... 

[csp-311]

I have even driven someone elses 3.1 with 40s webers on it.....they thought it was great, I thought it was an asthmatic ant....

[HKSZ]

What makes me laugh is these cars came out of the factory with two 43mm carbs

One SU feeds 3 cylinders

Yet ppl think six 40mm barrels feeding six cylinders can't possibly work, what ever happened to the mantra " don't over carb, don't over cam your Datsun"

Sometimes you need to look at the tuner more than the tune of the carbs

[gav240z]

SU's vs Webers.

First is 40mm Triple webers, second videos are twin SU's.

 

[NorCalZ]

On 8/4/2018 at 5:47 AM, gav240z said:

SU's vs Webers.

First is 40mm Triple webers, second videos are twin SU's.

 

And what was the final verdict that you preferred?  Also what exhaust  set up/ muffler do you have? Sounds great.

[gav240z]

5 hours ago, NorCalZ said:

And what was the final verdict that you preferred?  Also what exhaust  set up/ muffler do you have? Sounds great.

To clarify those videos are not mine, but someone else's on the internet showing an example.

I went with Triple Mikuni 44's on my 72 240z, which IMHO totally transformed the way the car drives and feels. I love the Triples, from the induction noise to the throttle response and overall feel, it's much nicer than when the car was on SUs. The SUs were good for the cold start choke, but I find the Triples are not that hard to start and I haven't really hooked up the chokes (it seems nobody does). Since you have the accelerator pumps which squirt fuel in if you press the throttle.

[Roady]

If you wanted to hook up the chokes to triples, not that much effort required - I bought a generic choke cable from Repco and attached it to the original mounting for our cars (240z) so all still looks standard inside.  Takes about 30-60mins and that’s for someone who moderately competent doing mechanical things.

 

Haven't had flooding issues as people complain about in many years (8+) of having them.

[gav240z]

If you have photos of what you've done I'd be keen to see it. I thought about hooking it up, but I actually think investing in an electric fuel pump would make things easier. Since when a 240z has been sitting with the mechanical pump the fuel flows back to the tank and you need to crank for a while to get the fuel into the carbs again.

[Roady]

I’ve got an electric pump as well which works but I found that with the choke I could just start driving rather than sitting idling to keep it comfortable.  Now that’s also to do with how I’ve tuned it with the 72 degree cam.  Once it’s been running for about 3-4 mins choke is completely off so it’s definitely not a necessary thing that’s for sure.
Yes - I’ll upload photos sometime over the weekend

[Roady]

Ok photos of the choke set up - sorry let me know if you want more clarification.  The generic choke I bought from Repco looks a little different from what they have now (1st photo) but basically there is an outer sheath that clips into the first Weber (closest to the engine - 3rd photo) then you run the inner wire through all the others(4th photo) which simply connects with the bolt which has a hole in it.
In the car you remove the pull handle of the Repco choke then connect the inner wire to the original choke handle.  From memory you just needed to bend the wire through the hole in the handle.  I can’t remember doing much more than that, except clamping down the outer sheath in the car where the original choke wire was clamped.  If you want photos of what’s going on under the centre console let me know but from memory it was actually quite easy.