Jeff20B

I was able to run it for a few seconds. I think the maximum was about 15 consecutive seconds before I touched the throttle, with 4 or 5 seconds before and after. I think it's only had about 45 seconds total running time. I didn't bother with any water cooling, but I guess I should if I plan to run it any more. The rotor housings got hot to the touch but not painful as a typical idling engine gets. The oil pan was barely warm. Hmm, I'd say the rotor housings got up to maybe 105-115ºF?



At first I cranked it with the plugs in and the fuel pump on then off. I think the dellorto has some stuck needle and seats because gas will drip out of the venturis. Heh, I stuffed a sock in it and kept cranking. Low and behold it started to pop out of the header. Little by little it picked up and then started to idle by itself. The moment I moved the throttle it would die. Weird. Also gas would dribble out of the air horns and onto the ground. I guess it's because the carb is slightly tilted downward (my driveay is slightly tilted that direction, so anyway).



At least I know my ignition is working. The engine had a slight vibration though as it was running. I'll have more time to mess with stuff like that later. Besides, I'm sure it's possible one rotor was running better than the other two; especially with my ghetto-rigged carb adaptor. Or maybe one of my ignitors wasn't functioning correctly? Heh, everything was hooked up with aligator clips.



Sorry, no audio clips, but to give you an idea, it sounded a little bit like the NA in RETed's recent video. It's just the header for now so it wpuld rpobably be too much for a mic up close (I was wearing hearing protection). I can't wait to get the Atkins manifold and use the Edelbrock. Yeah, I'll get audio clips and maybe even a video clip.



Heh, a 'rebuildable core' 20B that runs and only smoked a little at startup. We'll see if the smoke gets any worse like RETed's engine after I get the other manifold.

Jeff20B

I pulled the header off and saw that the middle pipe had a light coating of carbon. The front was a little less but the rear was clean. It's as if the rear rotor was not getting any gas. Maybe that's where the slight vibration was coming from?



Hey, since I want to get the Atkins manifold, should I add a shield inside made out of sheet metal to block the flow directly in front of the middle rotor? I guess I could try it with and without. The reason is because it might be a good idea to sort of lengthen the AF mixture's travel into the middle rotor. You know, so it's not quite so direct. Thoughts?

Racer X

You had the 3-rotor running?Wicked.Do a quickie compression test.

Jeff20B

How? I don't even have one of those Schrader valve type guages.

Racer X

That sux.I just borrow my friends guage when I need it.

Jeff20B

I know the compression is lower than a new engine. It doesn't puff out of the plug holes as forcefully as the 13Bs I've rebuilt. Aside from that, it still idled on more or less two rotors. I can't wait to try it with the other manifold.

j9fd3s

mine runs ok on 2 rotors.



congrats! on making noise with it! thats very cool

Jeff20B

Thanks!

Jeff20B

Any thoughts about possibly installing a diffuser type thing inside the SC manifold?

Jeff20B

I'm going to attempt four engine swaps soon. Well five if you count the GLC. The only one that worries me is the Cosmo because I've never pulled its engine before. All four of my four port 13Bs need new homes for some reason.