It's just sitting on some block of wood in my driveway (no car attatched).



It'll rev but won't idle, which is the opposite of what it was doing last week. All I did differently was open up the primary runner in the temporary carb adaptor and add a fuel pressure regulator.



Just unzip and listen.



Does it sound like I've got some vacuum leaks? Doesn't that starter sound tired? Tell me what you think.

Sounds like a bike to me. What was this recorded with?



Pics?

starter sounds a bit worn lol i like the sound of the motor though

I got it to run for about 30 seconds here. I basically had to constantly jiggle the throttle. I think it was running off the accelerator pump or something. Is that a sign of a vacuum leak?

I don't have any recent pics. Here is what it used to look like.



https://www.nopistons.com/forums/upl...1056270525.jpg



It was recorded with a crappy tape recorder. I don't know if you can detect the automatic level control, but it lowers the volume by itself. Heh, I guess it was necessary due to how close it was to the open header (about 6 feet away from the front of the engine).

This last one was after I moved the tape recorder into the garage and closed the garage door. You can barely hear the starter. lol that's how loud the engine is!



It seems to be a stong engine. I'm happy https://www.nopistons.com/forums/pub...IR#>/smile.png I've just gotta figure out a better intake system, as you can hear.

cool

Too cool to put into words!!! https://www.nopistons.com/forums/pub...#>/biggrin.png

ZOOM ZOOM BIOTCH

Alright ima sound like a noob but can someone give me the horse power and torque specs on this beast, another nobbish ? did they come turbo charged or N/A? Sry https://www.nopistons.com/forums/pub...IR#>/dunno.gif

That thing will be a monster when in a car.

Thanks for the great feedback everyone. https://www.nopistons.com/forums/pub...#>/biggrin.png



It'll rev a tad slower in a car because there was no clutch or pressure plate during the test. You can hear the starter engaging the flywheel which doesn't normally 'ding' with a clutch and p plate (I think). It'll also have to be a lot quieter. It'll still have the distinctive 20B exhaust note of course. I won't rest until it's quiet AND sounds good.



I have a couple ideas to try to get a reliable idle.



For more info about the 20B, Craig's page is currently up. http://cp_www.tripod.com/rotary/pg20.htm

I dunno man, engien sounds great, really great actually. Maybe a vac leak. What are you using for iginition? Sounds like its not firing properly. But man does that make me want a 20b.



https://www.nopistons.com/forums/pub...1047683894.gif

I think it's just a bad AF mixture due to a vacuum leak and fuel pooling in the UIM. I've listened to the clips several times and when it revs up, it sounds really good. It just seems to stumble greatly at low RPM and won't idle. It could be a timing problem, maybe. It's probably that big upper manifold that's allowing fuel to pool inside. If that's true, it'll never idle well.



I'm trying to come up with alternatives. The fuel pump and lines are set up for a carb, so I'd rather not rip it all out for FI.



I can think of a radical way to keep fuel from pooling inside the UIM. What if I chopped the LIM and welded the UIM to it rotated 90 degrees so the ports are straight up? I could set a Holley or Edelbrock carb right on it. The secondary 'siamese ports' are roughly the same size as typical carb barrels. The single primary port could be widened to accept the primaries of the carb. The runners would be shorter too.



I don't know if there would be enough hood clearance with this idea.

i like it! it revs like pauls when he took the turbo off.



you're running too much cranking timing. set it to 5btdc. sounds rich down low too, but its hard to tell

ok i just heard #2 i gotta uncork mine! yours sounds so mean!

Sounds badass. I love the 20B sound. NICE WORK! https://www.nopistons.com/forums/pub...#>/biggrin.png

Thanks guys. I'll change the timing a little and try again after I've figured out a better intake system.



I think I set the timing to TDC static as best as I could with the remarked FC pulley. Which direction should I go? A little less advance?



I'm not too worried about the slow starter. It was pulled from a parts car. I have two others within easy reach to try next time.

Oh, ok. I'll mod the intake some more and advance the timing a little.

Is the plan still to get this thing into an FC, or has that plan changed?



BTW, how long have you been at this project and was the engine ever in a car or have you just begun to build it?

It's going into a GLC if I can get it to run better. I got the engine about a year ago and have been working on it now and then. I've also been preparing the car. It runs with a 13B which also has running problems. I'm having trouble decided which engine should go in it.



If only I could make the 20B run better.

if anything retard the timing, it kicks back more the more you advance it

I think the timing is already at 0. Now I'm confused.

Stock FC and 20B leading marks are at 5ºATDC right? Ok, I set the static timing to 0 as close as I could. I simply counted 5 degrees of advance from the stock mark to arrive at 0º, then I transfered it onto the FC pulley while taking a black Sharpie to the stock FC marks. https://www.nopistons.com/forums/pub...IR#>/smile.png



So you're saying I should advance it 5º? I'll throw in my REPU's starter to hopefully take care of any slow cranking from now on (it cranked my old 3B 13B really fast). Come to think of it, the dizzy is rotated quite a bit counter clockwise.

maybe its just the starter then, its supposed to be 5btdc cranking, but yours sounds higher cause its kicking back

I'll swap starters and try to come up with a better intake system. Thanks for the info!

I got to measure an Atkins SC manifold today. I like what I see. https://www.nopistons.com/forums/pub...IR#>/smile.png

i like that you like that!

And I like that you like... uh... that. https://www.nopistons.com/forums/pub...#>/biggrin.png



I took a bunch of measurements and wrote them down 'drafting style' (that class in highschool is finally paying off). Then I did some quick measurements of the car and it looks like I won't have to cut the strut tower at all. Oh, it should idle with one of these manifolds too! :dbanana