2180 exhaust

[jeff naul]

I'm building new exhaust and wondering am I going to see any considerable power loss by going two into one? And at the rpm these engines operate is crossover worth the trouble? Thx, jeff

 

[JuergenA]

Hi Jeff,
on my engine, there is no difference between short stacks and 2 in one on each side, see my picture gallery.
The difference is the aerodynamic resistance of the short stacks. With the short stacks, it may be about 5-10mph less speed.
with best regards
Juergen

 

[tls258]

Wholly guacamole-short stack friction! How about 4-1 tuned exhaust?

My new bird has a chopped cowling where stack exits in front left side = bad. I want to do a 4-1 with airflow exit under body. Any ideas if it is worth the trouble?

https://www.v-dubstore.com/v/vspfiles/photos/E3699-2.jpg

 

[o2koold]

I wouldn't start with a car setup. I started with J-tubes and had to cut out about 2" next to the flange to clear the back spinner plate and firewall. I'm sure I could have tucked things a bit closer, but want some extra room for possible additions in the future;-) Because of the 4 into 1 and the EFI, I did my own cowling. My 4 into 1 exits in a channel on the bottom and the cooling air exits at the back of the cheeks. We will see very soon if it was worth it and possible gains.

Scott R

 

[o2koold]

Finished cowling over a 4into1 and EFI

 

[Pttim]

Cant wait to see this thing fly! A lot of different techno going on here.

 

[tls258]

Scott-

Nice set up but can't see your 4-1 collector in the pics. The auto set-up won't work due to space probably, but the idea in that exhaust is both aerodynamic (reduction in friction) and functional as an extractor that helps pull exhaust out of cylinder and some say increases HP by up to 5%. Both decrease strain on the engine. Pipes need to be equal lengths, etc. T

 

[o2koold]

Here is a better pic. I was not able to find a commercially available collector in the sizes I wanted so made my own. It was a pain doing it by myself without a jig. The tubes are all equal length and should be tuned for their size at about 3200 rpm. I also have a baja stinger/glass pack that I might use to fine tune to cruise and muffle some. I am thinking about using a trombone like slide with it to tune it while running.

Scott R

 

[Pttim]

The four into one exhaust is really cool so much to be gained. Too bad the stock cowling a don't have a little more room. Why don't you post that video of it running so I can be more jealous.

 

[o2koold]

Do you mean this one?

https://youtu.be/_Eksn81boBo

 

[Pttim]

Yes that one. Sounds sweet Scott

 

[o2koold]

It bent my rudder pedals holding it back. I found that out when I went to safety wire the turnbuckles. That was one of the times it tickled 3200 rpm.

 

[eschrom]

Nice airplane, Scott. All that innovation is inspiring!

Ed

 

[o2koold]

Thanks Ed,
I am looking forward to seeing how it all works out together.
Scott R

 

[tls258]

Nice collector and sounds great. With the stinger, I think it should be quieter than exhausting at the cowl. The glass pack would be a good idea to quieten it some w/o power loss.