So what is the answer? My understanding from reading the responses is that Tmoose is suggesting placing the mufflers close to the header collector to reduce standing waves for optimum silencing. Nicke is suggesting that placing the mufflers farther back can help increase VE above 100%. Why...
Did we lose some of the most recents posts on this thread? I could swear a member named cone something responded saying he works at Maxim Silencers and would be glad to answer muffler questions - his post and at least one more after that are gone?
Warpspeed said:
"Wherever I have seen exhaust...
Warpspeed & others - thanks for the detailed responses, I've learned a lot from this discussion. Thanks for taking the time to write such a detailed explantion. I understood the importance of attenuating low frequencies and converting into a steady flow, but did not realize the importance of...
Whitevette, can you (or anyone else) elaborate on your post: "Two mufflers? In series, they will work well together. In parallel, you'll have half the volume of gases (at the same noise level) going thru each one...so you'll end up with two noisy mufflers! Nothing much accomplished!"
Why does...
Oh, one additional question Warpspeed (or anyone else), can you answer this:
From your post, it sounds like a reduced sound exit area is very important for noise control. So dropping the 12" outlet to 8" or even 6" is a good idea, right? Why must the raincap not flutter? Obviously, I'm trying...
Thanks again for the additional responses. Since I've response from various people and have so many additional questions, I'll split my posts up for ease.
Warpspeed & MWPC, I understand the diminishing returns in sound attenuation as you add mufflers in series. From MWPC's experience it sounds...
Thanks for all the responses and discussion guys. Just a quick post before I leave to go camping with the kids for the weekend.
Franzh - thanks again for reminding us about all the other noise considerations besides the exhaust. I've 8" poured concrete walls, concrete floor, no windows, the...
Apologies to those that frequent the Automotive/Engine & Fuel forum and have already responded to me! I've posted this earlier in that forum but there probably are more acoustics experts here who may not frequent that forum.
I'm setting up an exhaust system for an engine dyno room and have...
Thanks for the responses & info. GregLocock, I've worked in dyno cells that use a butterfly plate to adjust backpressure. Who sells these? What size are your truck mufflers, and how effective are they - how loud is it outside? Could you describe your dyno exhaust - what size inlet pipes, output...
I'm not sure if this is the right forum for this, but I'm setting up an exhaust system for an engine dyno room and have questions. Here's what I have:
1. Room purpose - dynoing 4-cycle gas car engines, anything from 4 cyl to V8s, up to 1000HP or so, both blown and NA. No sustained durability...
Spud72 - yes, you're correct that the circuit has to be completed (current has to flow from one coil terminal to the other). So if you go open circuit on one terminal, the other plug will fire only if current gets to it somehow by any means possible. It'll still fire in the same polarity.
I'm also building an injector flow bench as well and just found this thread.
dgallup said:
"Lots of places can do injector flow testing, very few can do accurate, repeatable flow testing. Stay away from anybody with an ASNU tester, they are a total piece of junk."
Could someone elaborate on...
