PetenAli's WBX 2500 engine build

[silverbullet]

Have a nice Sunday drive!
Whereabouts are you in Netherlands?

[CJH]

Is that the standard carb from a 1.9? Has it been rejetted to suit the bigger capacity? Do you know how the performance of the engine compares to one with fuel injection?

[silverbullet]

It's a syncro one with the carb riser. Is it possible to build a hybrid carb with LT2.4 venturis and jets?

[CJH]

It's a syncro one with the carb riser. Is it possible to build a hybrid carb with LT2.4 venturis and jets?

It is.

[silverbullet]

There's you answer then Chris

[CJH]

What are you saying Ian? Can you tell from Mojoh's photos that it's an LT carb? It does look like it might be missing the fuel return spigot, but it's difficult to see the details clearly at that resolution. The LT 2.4 is closer to the WBX 2.5 in terms of capacity than it is to a WBX 2.1, so I can see how it might work as a direct swap, but either way it would be interesting to know if it's been on a rolling road for optimum jetting.

[silverbullet]

You said that a hybrid was possible! I have pressing efi queries...

[silverbullet]

Every day's a school day! I have managed to avoid gaining any experience of Digijet so far, thanks to my modified SA bus history but now I need to draw on the collective wisdom and experience in identifying the last few connections for my engine test rig

DJ loom laid out something like right (from a known runner, AUTO with aircon)


I presume this is ignition and permanent live (anyone got the plug and tail from a loom cut? Cover for the box?)


E D I T Throttle pot and W.O.T./kickdown switch?


E D I T Starter solenoid/ inhibitor connection? (judging by the gauge of wires):


Can't seem to find a plug for the crankcase vapour heater thingy, not that it is important:

[silverbullet]

PS I would have put this in tech.electrical but my photos would't post...

[ajsimmo]

Ian, I'm just doing a DJ loom swap on a customer van (also auto aircon). His was so chopped about by previous garages, and inappropriate LPG system badly fitted by chopping into loom/ecu plug etc.
I had a perfect full DJ loom so I'm removing the Prins LPG and returning engine bay to standard. I'm sure my customer would happily donate the remains of his old loom to help you out, including your missing plug and relay box lid.
Next pic down, 2 female spades are for pressure switch on PAS pump. Connector goes to throttle switch connection on top of RH manifold (which is both idle and WOT, ECU decides which according to AFM signal)
Next pic is 2 pin connection for fuel pump, rear RH corner behind airbox.
Next pic, breather heater is black and brown wire twin, comes from the daughter loom that you look like you're missing, from back junction box to relay box (has wiring for oil switches and coolant level too). Got one if you need it!

[silverbullet]

Many thanks! Yes please to all of that, some or all of this loom will (eventually) be going into my now ex-subaru bus, which was also well-butchered...

[silverbullet]

Andy, I will email you from work later on.

[Mojoh]

Is that the standard carb from a 1.9? Has it been rejetted to suit the bigger capacity? Do you know how the performance of the engine compares to one with fuel injection?

Oooops and sorry. This was a library picture purely for the looks. We can't use the Pierburg, cause the chokes are just too small. The 2.5 needs to breathe.
We've gone back to the standard (ish) Digifant System, chopped up or out the Cat, left the Oxygen Sensor in place and used a modified AirFlow Meter, ℅ Aidan. Not exactly sure what he had poked into that thing, but it delivers loads of fuel at the right time. Everything else on the Digifant system is set up correctly according to Bentley anyway. In real life, now 1300 miles down the road, the engine has loosened up and also got a roar to it. It flies in other words. Brilliant. I will lump this 2.5 out in a couple of weeks and lump in the next one, which I plan on keeping for myself and test drive stuff. Now the injection is running correctly, I won't touch it. However, there is talk of a totally new digital ignition/fuel injection system in the pipeline. We are talking to the makers at the moment to check that they really understand a 2.5 Boxer. Looks promising but expensive, so we see how the figures add up.

Anyway, this first engine , has to work it's way out of my 2 x 4 Standard van back into a Sycro, which is pre-86, so no injection there. We will feed it with two twin choke Webbers which are currently away being 'looked at' and assessed. We've found an 'old boy' who is .....eeerrr old, but was messing around with carbs even before I was born, so a long long time ago. He knows, so we wait to see what he recommends in final choke sizes, air jets, fuel jets and accelerator pump jets. At the moment, we have no idea. I'd prefer 1 x twin choke, but that long old manifold is also a serious restrictor of flow. Great for a 1.9, can be squeezed to feed a 2.1 (just), but then the story is over. A 2.5 needs more for sure. Good luck...., I'm just driving it and having a big smile. Two new orders this week also.. makes me smile twice then.

[silverbullet]

I will be very interested to see your new sfi, when it arrives.

In the meantime, today finished thus at Holman Eng Co:




Nice clean loom and afm from the Oetti (a known runner so should be ok...) and I now have the basis of a fuel delivery system to test run engines:



It's a Jaguar XJ-S swirl pot, usually gravity fed from the main tank into the left side pipe. It has an internal filter/strainer just like a T3 fuel tank; it draws from the middle fitting and fuel returns to the small black pipe.
So a funnel and a tall riser to fill and it's ideal for the job afaics

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PS the short belt on the waterpump is obviously only for testing...