Wideband sensor in LCB y-piece

[gs.davies]

Anybody got a pic of where they’ve installed the sensor bung on a y piece? I’d like to try to avoid a dry fit up of this if possible?

Cheers
Gary

[gs.davies]

..or to put it another way.. has anyone installed a Wideband in the upper part of an LCB, so it reads only cylinders 1 and 4 (in the same way an EFi later Mini would get it's readings..)?? If so, is there a downside to doing this?

[r.tec]

2019-09-06 (5)kl.jpg

It's for my air-fuel monitor (K&N):

2013-12-30 (8) korr.jpg

[gs.davies]

Does the remote housing get in the way?

[r.tec]

Oh, I don't know as I use it with a rodchange. But there is space enough so I reckon that it won't foul the remote housing.

[timmy201]

Here’s one I’ve seen on a rod change setup. My friend did have one on his remote but I haven’t found a picture :

image0.jpeg

In regards to adding it to the 1/4 exhaust pipe - I think this would be OK for a twin carb setup as the split between inner and outer cylinders should be essentially the same and you’d be able to read the average of both carbs

If you had a single carb reading only 1/4 you’d get a skewed reading due to the uneven fuel distribution between inner and outer cylinders

[murty]

Here’s one I’ve seen on a rod change setup. My friend did have one on his remote but I haven’t found a picture :
image0.jpeg

In regards to adding it to the 1/4 exhaust pipe - I think this would be OK for a twin carb setup as the split between inner and outer cylinders should be essentially the same and you’d be able to read the average of both carbs

If you had a single carb reading only 1/4 you’d get a skewed reading due to the uneven fuel distribution between inner and outer cylinders

I would have thought that you'd still get the inner and outer cylinders uneven on a twin carb (or even a Weber DCOE) since cylinder 1 follows cylinder 2, and cylinder 4 follows cylinder 3 (firing order is 1-3-4-2, or re-ordered 2-1-3-4) caused by the scavenging effect. Measuring the outer cylinders with a WB O2 sensor would give the leanest reading, and hence would allow a better tune so that these cylinders are OK.

[timmy201]

Here’s one I’ve seen on a rod change setup. My friend did have one on his remote but I haven’t found a picture :
image0.jpeg

In regards to adding it to the 1/4 exhaust pipe - I think this would be OK for a twin carb setup as the split between inner and outer cylinders should be essentially the same and you’d be able to read the average of both carbs

If you had a single carb reading only 1/4 you’d get a skewed reading due to the uneven fuel distribution between inner and outer cylinders

I would have thought that you'd still get the inner and outer cylinders uneven on a twin carb (or even a Weber DCOE) since cylinder 1 follows cylinder 2, and cylinder 4 follows cylinder 3 (firing order is 1-3-4-2, or re-ordered 2-1-3-4) caused by the scavenging effect. Measuring the outer cylinders with a WB O2 sensor would give the leanest reading, and hence would allow a better tune so that these cylinders are OK.

It is an interesting dilemma to think about with the Siamese inlets and exhaust ports. As you say the second intake charge per port would be compromised compared to the first (from a fuel mixture and time perspective), I wonder if this causes more or less of an effect than inner/outer cylinders on a single carb manifold (from a fuel distribution perspective). The inner cylinders of each port fire first, but would also tend to receive a less favourable shot from the single carb.

I think ideally you'd have the sensor in the exhaust pipe once all the cylinders have merged. My particular sensor recommends a minimum of 24" from the exhaust ports, so that's getting pretty close to the merge.

I guess if you were really curious about it, one of the extended 3 into 1 manifolds could accomodate 3 individual sensors (AFR or EGT) to monitor the split between the inner and outer cylinders. I don't know if there's necessarily anything you can do regarding tuning between each cylinder to even them out. Perhaps it might be useful for getting that last hp for a race mini, but perhaps you wouldn't see any noticeable change for a road car

72889_4a8c1271a5e7679bd2138c2f3d8f7f81.jpg

[Richspec]

Does the remote housing get in the way?

Yes massively.
I had to move my lambda basically back to the gearchange position, otherwise there simply isnt room. On a rod change you can have it nearer the Y.
I also have had probes in the different branches when i was chasing ida fuel injector tuning, All it did was highlight the difference between inners and outers. Sometime too much data can be a bad thing, just stick with a engine average and check your plugs by eye and adust mixture to suit.

[Fanfaniracing]

I did it that Way. Works superb...

IMG_2024-03-21-093155.png

[murty]

Here’s one I’ve seen on a rod change setup. My friend did have one on his remote but I haven’t found a picture :
image0.jpeg

In regards to adding it to the 1/4 exhaust pipe - I think this would be OK for a twin carb setup as the split between inner and outer cylinders should be essentially the same and you’d be able to read the average of both carbs

If you had a single carb reading only 1/4 you’d get a skewed reading due to the uneven fuel distribution between inner and outer cylinders

I would have thought that you'd still get the inner and outer cylinders uneven on a twin carb (or even a Weber DCOE) since cylinder 1 follows cylinder 2, and cylinder 4 follows cylinder 3 (firing order is 1-3-4-2, or re-ordered 2-1-3-4) caused by the scavenging effect. Measuring the outer cylinders with a WB O2 sensor would give the leanest reading, and hence would allow a better tune so that these cylinders are OK.

It is an interesting dilemma to think about with the Siamese inlets and exhaust ports. As you say the second intake charge per port would be compromised compared to the first (from a fuel mixture and time perspective), I wonder if this causes more or less of an effect than inner/outer cylinders on a single carb manifold (from a fuel distribution perspective). The inner cylinders of each port fire first, but would also tend to receive a less favourable shot from the single carb.

I think ideally you'd have the sensor in the exhaust pipe once all the cylinders have merged. My particular sensor recommends a minimum of 24" from the exhaust ports, so that's getting pretty close to the merge.

I guess if you were really curious about it, one of the extended 3 into 1 manifolds could accomodate 3 individual sensors (AFR or EGT) to monitor the split between the inner and outer cylinders. I don't know if there's necessarily anything you can do regarding tuning between each cylinder to even them out. Perhaps it might be useful for getting that last hp for a race mini, but perhaps you wouldn't see any noticeable change for a road car
72889_4a8c1271a5e7679bd2138c2f3d8f7f81.jpg

The siamese exhaust ports on 2-3 are not an issue since there is no overlap on the exhaust (there is a full 360 degrees between them).
Ideally you do not want to run the lean cylinders (1 and 4) too lean, and so you would need to richen the mixture if measuring the average of all 4 cylinders in the exhaust pipe such that cylinders 1 and 4 are not lean, then live with whatever 2 and 3 give (slightly rich).
The joys of siamese port engines.

[BAD942B]

Does the remote housing get in the way?

Yes massively.
I had to move my lambda basically back to the gearchange position, otherwise there simply isnt room. On a rod change you can have it nearer the Y.
I also have had probes in the different branches when i was chasing ida fuel injector tuning, All it did was highlight the difference between inners and outers. Sometime too much data can be a bad thing, just stick with a engine average and check your plugs by eye and adust mixture to suit.

Any chance we could have a photo of where you fitted the boss for the sensor you have with the remote change