pies Posted January 1, 2007 Share Posted January 1, 2007 is there any science behind ram tubes and the effects of using them over standard "smack-em-on-top" air filters? what does changing length do? i am a complete n00b when it comes to carbs so please try and remember this Quote Link to comment Share on other sites More sharing options...
thegreatestben Posted January 1, 2007 Share Posted January 1, 2007 Velocity stacks are another name, Isnt it the same as incresing the length of runners on a manifold, straightens airflow = more torque? Quote Link to comment Share on other sites More sharing options...
J2Racing Posted January 1, 2007 Share Posted January 1, 2007 Thats my understanding! Thats why the holdens were given the 1" spacer in the NZV8's and so we didn't have to watch Lane Scott cry and national telly again. Quote Link to comment Share on other sites More sharing options...
Snoozin Posted January 1, 2007 Share Posted January 1, 2007 They effectively alter the velocity at which the air enters the engine through the inlet tract. Different velocity affects power and torque characteristics as I understand. Quote Link to comment Share on other sites More sharing options...
cute wee gem Posted January 1, 2007 Share Posted January 1, 2007 ^^ pretty much what he said, short = good for high rpm, thats why you see them on motorbikes, and longer being better for torque. I read up along time ago on it but can't fully remember all of it. Also sharp edges aren't good, the ends should be curved smooth back around. Quote Link to comment Share on other sites More sharing options...
nismo.capri Posted January 3, 2007 Share Posted January 3, 2007 Different velocity affects power and torque characteristics as I understand. The intake has pressure waves running through it becuse of the valves opening and closing (this is the cause of reversion). Just like exhaust extrators the intake can be tuned for a particular RPM range so that the energy of the pulses helps fill the cylinder Quote Link to comment Share on other sites More sharing options...
isnowi Posted January 3, 2007 Share Posted January 3, 2007 Some interesting reading on intake manifold runner lengths, velocity stack lengths and sizes, and throttle body sizes too, all related to fuel injection obviously, but much of the theory is the same as for non injected. http://www.team-integra.net/sections/articles/showArticle.asp?ArticleID=471 Quote Link to comment Share on other sites More sharing options...
Dell'orto Posted January 3, 2007 Share Posted January 3, 2007 Havent you heard Redmist going on about Helmholtz?? Google it, its quite interesting. Quote Link to comment Share on other sites More sharing options...
pies Posted January 3, 2007 Author Share Posted January 3, 2007 Havent you heard Redmist going on about Helmholtz?? Google it, its quite interesting. i just thought he was some kind of lord of the rings geek Quote Link to comment Share on other sites More sharing options...
nismo.capri Posted January 4, 2007 Share Posted January 4, 2007 Havent you heard Redmist going on about Helmholtz?? Google it, its quite interesting. i just thought he was some kind of lord of the rings geek Helmholtz is interesting but a bit old. Modern gas/fluid dynamics is more accurate Quote Link to comment Share on other sites More sharing options...
J2Racing Posted January 4, 2007 Share Posted January 4, 2007 Helmholtz is interesting but a bit old. Modern gas/fluid dynamics is more accurate When did stephen hawkins join the fourm?? Quote Link to comment Share on other sites More sharing options...
nismo.capri Posted January 4, 2007 Share Posted January 4, 2007 Helmholtz is interesting but a bit old. Modern gas/fluid dynamics is more accurate When did stephen hawkins join the fourm?? if I was Stephen Hawking I'd have a much faster car Quote Link to comment Share on other sites More sharing options...
J2Racing Posted January 4, 2007 Share Posted January 4, 2007 Helmholtz is interesting but a bit old. Modern gas/fluid dynamics is more accurate When did stephen hawkins join the fourm?? if I was Stephen Hawking I'd have a much faster car I thought he had a wheel chair. Guessing yours would have a blower Anna nicole smith would work. She looks good as a nurse Quote Link to comment Share on other sites More sharing options...
nismo.capri Posted January 5, 2007 Share Posted January 5, 2007 I thought he had a wheel chair. Guessing yours would have a blower Anna nicole smith would work. She looks good as a nurse ....and even better as the blower Quote Link to comment Share on other sites More sharing options...
J2Racing Posted January 5, 2007 Share Posted January 5, 2007 DGSL D umb G irls S uck L onger Quote Link to comment Share on other sites More sharing options...
Sparkle Posted January 5, 2007 Share Posted January 5, 2007 oh nah this thread hasnt turned into shit. Quote Link to comment Share on other sites More sharing options...
J2Racing Posted January 5, 2007 Share Posted January 5, 2007 to many p0eople on holiday with to much time on thie hands. Quote Link to comment Share on other sites More sharing options...
CaMpylobacter Posted January 5, 2007 Share Posted January 5, 2007 spam Quote Link to comment Share on other sites More sharing options...
nismo.capri Posted January 5, 2007 Share Posted January 5, 2007 to many p0eople on holiday with to much time on thie hands. Speak for your self I'm at work...... Here's some thred content for Sparkle and spam CaM The short story is ram tubes are good, to get max effect you need to tune the tube length on a dyno to maximise the benifit. Stolen from: http://autospeed.drive.com.au/cms/A_107746/article.html The Injection Perfection throttle bodies take bolt-on intake trumpets, and Mike had a whole variety of lengths and designs to play with. We won't show all of the tests - just three. The blue line shows the power with a 14.5 inch intake runner length (from the end of the Weber trumpet through to the intake valve). As you can see, power peaked at 88kW. Pulling these off and swapping to 12 inch intakes took that up to 98kW, while 13.5 inches was the optimal length giving an even 100kW. These changes were made one straight after the other, so it can be said with certainty that swapping intake trumpets gave a change of 12kW! Yup, fine - getting good results from 13.5 inch trumpets. But were they going to remain bare and open - or were filters going over the top? Mike believes that sock-type filters wrecks the flow into the belllmouths, so he intended using an airbox over them. But what would this do to the intake tuning? He made a cardboard airbox and placed it over the intakes. The red line shows the starting point - using long runners and with a bit of a wobbly power curve, peaking at 98kW. The blue line shows what the airbox did - lifting power at one point but causing a 5kW dip in the curve at higher revs. So yup, an airbox sure does change the tuning characteristics! So what about putting a feed tube to the airbox? A short 3-inch intake duct was fitted, with the power then made shown by the green line. The power curve was smoothed out, still peaking at 98kW but being a few kilowatts down at lower rpm. Quote Link to comment Share on other sites More sharing options...
Gaz Posted January 5, 2007 Share Posted January 5, 2007 Interesting. No Filters FTW. Love those types of writeups and dyno pics to prove. Its awsome when someone puts the time and effort on a dyno up for everyone to see. Quote Link to comment Share on other sites More sharing options...
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