Australian Land Rover Owners

Gallery Donate Games Arcade Calendar Markets Shop Chat Subscribe! Files Links
Go Back   Australian Land Rover Owners > The Pinnacles > Range Rover > Classic Range Rover

Classic Range Rover Chat specifically relating to Classic Range Rover and derivatives.

Thread Tools Display Modes
  #11 (permalink)  
Old 16th August 2011, 09:58 PM
clubagreenie's Avatar
Silver Subscriber
Join Date: Dec 2007
Location: Sydney, you know. The olympic one.
Posts: 4,882
Thanks: 340
Thanked 1,345 Times in 1,063 Posts
Pulse effect scavenging is exactly what you want at each collection point. More so if you're 4-1, the pipes into the collector should be in firing order sequence to create a vacuum drawing the dirty air and helping to pull via vacuum the clean air into the chamber. The inlet side operates in a similar way with pulse reversion back up the inlet tracts occurring when the valves close and the air (traveling at not an inconsiderable speed) hits the back of the closed valve and bounces back up the tract. Also why you sometimes see the plenum (if the plenum inlet is at the front) larger at the rear, to provide a reservoir else you can lower the effective pressure inside the plenum and "run out of air" so to speak.

A 4-1 is less effective at scavenging as the collection occurs only at one point so you have only one opportunity for the vacuum to occur where as 4-2-1 allows collection at multiple points. By the time gases reach the Y it's pretty much over.

Custom made headers 4-2-1.

Custom tuned length 4-1
I'm "a biased abusive tosser," So you should "I don't a word he says."

My knowledge vs your ignorance, only one can win.

The irony of life is that it is lived forward but understood backward.
Reply With Quote
Sponsored Links

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Search ONLY!
Search All the Web!

All times are GMT +10. The time now is 03:34 AM.

Powered by vBulletin®
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0 PL2
Copyright 2001 - 2015
Owned and Operated by Dave Blears Computing - DavecandoIT
LAND ROVER and its logo are the registered trademarks of Land Rover.
Land Rover is not affiliated with