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I am analyzing their data now. It is interesting the first run with just the Webers and stock distributor have the same wonky A/F Run that seems to be on nearly all 45DCOE's on L engines....with the big dip at start and a wide range (from 11 to 14 A/F in this case) Below: No big change at all to the A/F or power (surprised that no low-end gain) with the 45DCOE plus the highly customized electronic ignition system. Below: The final results are interesting comparing the EFI to Webers on the same graph. A/F below 115km/h (where DCOE has a big rich dip) seem to make little difference in power between carb and EFI w timing. In comparing the power to A/F, it seems that by smoothing the higher RPM A/F be between 12.5 and 13.0 made the biggest improvement in power.

NOS

I noticed #3 stamped on the pistons and #3 stamped beside each bore on the L26 I just rebuilt. Factory sizing tricks so that you pull from the right bin.

A Subway map for the planet!

Courtesy of Hoover Plate and number match but stickers vary. Either different stages or different races.

https://youtu.be/6D-hhERRf20 https://youtu.be/vHONrfJgTJ4

Try drilling out the F11's and give it a go. Your fuel ~ 29mm should be ok.

I don't think fuel level or stock ETubes will make a difference as F2, F9, F16 were all tried and no big change in the dip.It is always there. Likewise Leon runs 25mm fuel depth and you run ~29mm and the dip is there. The only parameters not changed yet are the Aux Venturi and eTube modifications.

Nice to see good friends!

Done... I bought the CD. My content is free too. I still hate the way ads and the new Visually Impaired Giant Text For Phones wrecks websites. The tools listed above barely make the web usable.

You weren't drinking this suff? btw there is a Bee in Beer.

Aren't our hoods supposed to come in through the glass and cut off our heads?

https://www.ghostery.com/ https://www.ublock.org/ https://adblockplus.org/ You can use ublock to kill annoying space hogging crap on web pages too. Before After

I wish there were, then we could tease them about their wooden floor boards ?

What are ad's?

That interior!

What we learned: 1. It was hoped the rich dip at the start of the Main Circuit was due to the Accelerator Circuit's squirt but you proved it to be not the case: 2. Etubes were tried but the rich dip at the start of the Main Circuit remained: 3. Other Datsun engines of different sizes with 45DCOE's experienced the same rich dip at the start of the run Maybe enlarging holes near the mid-to-top of an Etube is needed to lean the start greatly? The F11 tubes look like an easy candidate for drilling. They have 4 0.1mm holes that are horizontal. It looks like you can drill straight through the body to enlarge two of these 4 holes at a time. If you are keen, you can consider the following: 1. Put F11 in and appropriate main and air to get a few baseline runs. 2. Cross drill on one axis to enlarge two of the 4X100 holes 3. Conduct a few measurement runs. 4. Analyze results. 5. Drill out more or solder as needed.

I did some checks and one Weber book has this: The 42DCOE Throat is "over-carbed" so a 3.5 is used. They also use the 3.5 on a 3 X45DCOE on a 3.8litre Jag so they go smaller Aux with larger Carb. But Passini states: " A small-bore nozzle is, on the whole, better from the economy aspect and, unless the pulse energy transmitted to the well at high revs is so weak as to demand a very rich setting that can spoil the lower range, it is better to try a small one first. Engines with fairly large cylinders and siamesed inlet ports normally prefer larger auxiliary venturis." His comments about being lean at high end and rich at the low end with smaller Aux Venturis seems to be the problem with the 45DCOE's and 4.5Aux. @Chickenman What are your thoughts on how to flatten the strange WOT A/F shape of 45DCOE's on Z's? Is the Aux Venturi a significant player?

I thought about this for an hour before falling asleep. It is troublesome. This same shape seems to be independent of E-tubes, choke size, jet size, fuel level (as I believe Leon runs 25mm and you are running ~29mm) and engine size. It happens on the 2.55litre Equivalent A15 and on >3.0litre Strokers! There has to be another parameter no one has addressed.. So I remembered something from Passini ... the Aux Venturi. I'll do more research and if it is a lead then I'll buy a set and ship to you.

The more one looks, the more one finds ? Here is fuel rail on HLS30-00249 in that area. Throttle shaft looks the same but the bracket is closer to the middle of the engine: HLS30-00013 looks the same as #249

Thanks for the high resolution! Here is another find. The inlet on the fuel pump is on the front and outlet is inboard. Also the exit hose the pump is light colour. I'll dig some more ? HLS30-00013 Fuel Routing.

Thanks! They all have the wonky shape. Even the Stroker with 38mm chokes! Super rich dip 3k to 4k then leaning on the top end. DCOE 45'S - (End of day settings at dyno shop - 38mm Choke | 145 MAIN | 160 AIR | 65F9 IDLE | F11 )