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Old 11-01-2020, 02:47 PM   #601
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Carb rebuild kits should arrive tomorrow...and the manifold MIGHT be ready. The welding shop said early in the week .

Meanwhile, I'm bored, so I made velocity stacks.


Red ABS, because might as well stick with the theme.
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Old 11-08-2020, 02:23 PM   #602
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It's alive again.



Still no exhaust, and that D-cam certainly doesn't seem terribly smooth during warmup. I'm not convinced my ignition is the best, so the lumpiness doesn't concern me currently. I'm getting a solid 50 psi oil pressure at 2000 rpm, which is great for an unknown engine .

The stacks were too long so I am making some shorter ones, and I have no idea how I'm going to manage that linkage...but I'm sure something will come to me soon.
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Old 11-08-2020, 09:32 PM   #603
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Short stacks done.



Now I need to figure out that linkage...ugh.
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Old 11-22-2020, 07:23 PM   #604
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Everything is done!

...and one of the carbs is cracked at the fuel inlet. It's a banjo bolt setup, so it must have been over-tightened (by me...possibly) at some point. Some JB weld and thread sealant has me crossing my fingers currently. If it doesn't work I'll have to figure out a way to replace the rotten float mount on the third ZS CD175 I got from the B30 penta engine and swap everything over.

There's no pictures, because I didn't want to let the fuel waterfall continue long enough for me to get my camera.
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Old 11-23-2020, 07:03 PM   #605
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Fuel leak solved with JB weld and thread sealer .

The D-cam is certainly lumpy, even after running long enough to warm up. I'm not totally sure that the engine is 100% healthy, or that the penta distributor I added vac advance and pertronix to isn't a problem...but the timing is rock solid at 10* at idle. It certainly revs up clean though, so if the snow melts a bit I may try to take it around the block and see what the air fuels are like with the 2AA needles.

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Old 11-27-2020, 03:15 PM   #606
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Ready to drive!

...in March, if winter is mild. :(

Last edited by Broke4speed; 11-27-2020 at 03:21 PM..
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Old 01-01-2021, 05:40 PM   #607
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Well, we're in lockdown until mid Jan here, but luckily I still get to go to work. While I'm off for the holidays I tackled the MSD ignition install, because carbs LOVE good spark. It's not for horsepower, it's for efficient cylinder kabooms, and the benefits are already clear.

Warning...swear words.



I also added some 1/4 spacers to allow more room for the throttle cable quadrant, since it was hitting the manifold at rest. I'm going to add a piece to the throttle pedal arm where the cable connects, since I barely get full throttle travel when going WOT. That'll be for another day though, I have months to poke at it.
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Old 01-10-2021, 07:22 PM   #608
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Found a set of ZS carbs off a B20 on Ebay.ca for $230 CAD shipped...so I grabbed them .

[Edit]So, after doing a bit more research...they're actually off a B21/B23 from 1980+! They're not dual carbs, but instead two singles that someone is selling as a pair. This is even better, IMO .

Last edited by Broke4speed; 01-10-2021 at 07:36 PM..
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Old 01-15-2021, 11:28 PM   #609
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Ebay carbs arrived...and it's good news all around .



They're two OG Canadian B21A carbs from 80-84. One was definitely refurbished and has some odd tweaks, and the other is just about as expected for an older carb. I'm considering making a set of hybrid, super-adjustable carbs out of them using the Penta versions I'm on now as donors. Swapping the adjustable jets into a set of bodies with an idle mixture/bleed screw...overrun diaphragms...spring-loaded needles...etc. It would be killer .
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Old 02-04-2021, 11:19 AM   #610
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Got a dual-EGT setup from www.auberins.com since I've used their stuff before and I really like it. I'll be putting one in cyl 1 and cyl 4 to check the mixture balance between carb banks (1-2 and 3-4). Dual widebands would have been better but this was a LOT cheaper, and I really only care about syncing the carbs, not the AFR, since I have a wideband further downstream anyway. If I ever end up going back to fuel injection with a stock intake, it'll be interesting to see how much the cyls differ too.






The best thing about Auber Instruments gauges is that they're configurable for virtually any automotive sensor, including wideband O2s. If I decide to remove the EGTs, I can monitor coolant temp, oil temp, oil pressure, fuel pressure, boost, etc etc etc .
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