all the race cars i've seen (formula 2,s) etc all had very long ram tubes, over 100mm some alot longer, i have been told to put the longest ram tubes you can fit
Heath ----- Original Message ----- From: E Smith <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, June 25, 2003 6:53 PM Subject: RE: 40mm weber ram tubes > I fitted an air box to cut down induction roar and lost 10 Kw at the rear > wheels due to changes in ram tube length. > > Cheers, > Feral Errol > Get Serious tm<http://www.datrats.com.au/> > > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Robert Charles > Scealy > Sent: Wednesday, June 25, 2003 5:42 PM > To: [EMAIL PROTECTED] > Subject: Re: 40mm weber ram tubes > > > Agreed. The ammount of reflection would be heavily dependant on too many > factors so would change from car to car as well, as when you are getting > to that level even the distance from the bellmouth to the bodywork would > influence results. Also the speed of sound will be probably be different > in the ram tube as the air would be cooler, and doesnt have fuel vapours > mixed in. > > On Wed, 25 Jun 2003, David Andrews wrote: > > > Pick the University people. :). > > > > It would be possible to increase the amplitude of the compression wave I > > suppose through this technique, but it may be minimal as when the > > compression wave travels back from the bellmouth exit to the choke it > > will be partially reflected and so only a portion of the compression will > > continue back down with the original reflected compresison wave. > > > > I'm not going to read that to check it. Too hard. > > > > Dave > > > > >>>>>>>>>>>>>>>>>> Original Message <<<<<<<<<<<<<<<<<< > > > > On 25/06/03, 16:26:10, Robert Charles Scealy <[EMAIL PROTECTED]> wrote > > regarding Re: 40mm weber ram tubes: > > > > > > > Maybe you could get some difference if you made the distance from the > > > port to the choke equal to the tuned length from the choke to the > > > bellmouth exit, then you would have some chance of setting up a harmonic > > > standing wave, with a node at the choke? Like if you pick a guitar > > > string, and then place your finger over the exact centre of the string, > > > you still get some of the sound? > > > > > On Wed, 25 Jun 2003, David Andrews wrote: > > > > > > Guys, what you are talking about is the RAM effect which occurs as > > > > follows: > > > > > > > > When the intake valve opens, an expansion wave travels up the intake > > > > runner. When it reaches THE FIRST JUNCTION, it is reflected back as a > > > > compression wave. The RAM effect is using the compression wave to > > > > compress the air into the cylinder just as the intake valve closes > again. > > > > It is apparently possible to achieve Volumetric Efficiencies above > 100% > > > > (for a specific rev range obviously). > > > > What Kris said was correct, longer is for low end, shorter is for top > > > > end: > > > > > > > > http://www.grapeaperacing.com/GrapeApeRacing/tech/intaketuned.cfm > > > > > > > > But if you actually plus the numbers in, you're not talking 1.5 > inches. > > > > You're talking more like 15 inches. The link above has some formulas > for > > > > working it out. But the important thing to note is that it won't make > > > > fuck all difference on a car with carbies because the first junction > > > > (where the reflection happens) is at the `out' side of the carby, not > the > > > > inlet side. > > > > > > > > However, using bellmouth shapes does increase the airflow into the > carby > > > > by reducing the turbulence around the opening. But the length of this > > > > will have a negilible impact on the overall VE of the engine. > > > > Regards, > > > > > > > > Dave > > > > > > > > > > > > >>>>>>>>>>>>>>>>>> Original Message <<<<<<<<<<<<<<<<<< > > > > > > > > On 25/06/03, 14:31:24, Richard Webb wrote > > > > regarding Re: 40mm weber ram tubes: > > > > > > > > > > > > > I found a pic of some on that race car that someone sent to the list > > > > > recently.... > > > > > > > > > http://www.race-cars.com/carsales/other/1054143781/1054143781ph.jpg > > > > > > > > > They are tiny?? and the eggcups wouldnt need any extending.. I guess > > > > > they are after high end. Isnt there a stainless bowl or cup or > > > > > something I can modify... :) > > > > > > > > > ----- Original Message ----- > > > > > From: "Kristian Walsham" > > > > > Date: Wednesday, June 25, 2003 2:09 pm > > > > > Subject: Re: 40mm weber ram tubes > > > > > > > > > > A long one will better suit low to midrange torque and power while > > > > > > a short > > > > > > one will produce more mid to top end. > > > > > > I think most short ones are about 1.5 inches long while longer > > > > > > ones are > > > > > > about 2-2.5 inches long. You would have to design it around engine > > > > > > bay space > > > > > > and the type of cam you are using. > > > > > > > > > > > > Kris. > > > > > > ----- Original Message ----- > > > > > > From: "Richard Webb" > > > > > > To: > > > > > > Sent: Wednesday, June 25, 2003 1:48 PM > > > > > > Subject: Re: 40mm weber ram tubes > > > > > > > > > > > > > > > > > > > I know this has been discussed before but how long (idealy) > > > > > > should the > > > > > > > ram tubes be? Also how the hell do you join stainless steal? The > > > > > > > article says use tig welder... or hose clamp? Any ideas, because > > > > > > I dont > > > > > > > have a welder... > > > > > > > > > > > > > > ----- Original Message ----- > > > > > > > From: David Andrews > > > > > > > Date: Wednesday, June 25, 2003 1:21 pm > > > > > > > Subject: Re: 40mm weber ram tubes > > > > > > > > > > > > > > > If twas me: i'd be going from 47 (45 by moi) down to the 40 > > > > > > with a > > > > > > > > nice > > > > > > > > cone rolled up by your local stainless shop. I'm doing the > same > > > > > > > > thing, > > > > > > > > albeit longer, for my custom intake manifold. > > > > > > > > > > > > > > > > Dave > > > > > > > > > > > > > > > > >>>>>>>>>>>>>>>>>> Original Message <<<<<<<<<<<<<<<<<< > > > > > > > > > > > > > > > > On 25/06/03, 15:36:55, Richard Webb wrote > > > > > > > > regarding Re: 40mm weber ram tubes: > > > > > > > > > > > > > > > > > > > > > > > > > Yeah just got the article, 47mm diamater isnt going to work > too > > > > > > > > well on > > > > > > > > 40mm > > > > > > > > > webbers. I'll have a look with one of them see what I can > make. > > > > > > > > > > > > > > > > > I dunno how that Jullian Edgar guy comes up with 1/2 that > > > > > > > > stuff.... hes a > > > > > > > > > total car nerd :) > > > > > > > > > ----- Original Message ----- > > > > > > > > > From: "E Smith" > > > > > > > > > To: > > > > > > > > > Sent: Tuesday, June 24, 2003 5:11 AM > > > > > > > > > Subject: RE: 40mm weber ram tubes > > > > > > > > > > > > > > > > > > > > > > > > > Dave, > > > > > > > > > Youve been reading Autospeed :-) > > > > > > > > > > > > > > > > > Cheers, > > > > > > > > > Feral Errol > > > > > > > > > Get Serious tm<" target="l">" > > > > > > target="l">http://www.datrats.com.au/>> > > > > > > > > > > > > > > > > > > > > > > > > > > -----Original Message----- > > > > > > > > > From: [EMAIL PROTECTED] > > > > > > > > > [mailto:[EMAIL PROTECTED] Behalf Of > David > > > > > > > > Andrews> Sent: Tuesday, June 24, 2003 2:42 PM > > > > > > > > > To: [EMAIL PROTECTED] > > > > > > > > > Subject: Re: 40mm weber ram tubes > > > > > > > > > > > > > > > > > > > > > > > > > You may be able to make your own out of some egg holders > from > > > > > > > > > Safeway/Woolworths. They're $1.85 each here, perfect > bellmouth > > > > > > > > shape. ID > > > > > > > > > of 44mm. Regards, > > > > > > > > > > > > > > > > > Dave > > > > > > > > > > > > > > > > > >>>>>>>>>>>>>>>>>> Original Message <<<<<<<<<<<<<<<<<< > > > > > > > > > > > > > > > > > On 24/06/03, 14:01:59, "Kristian Walsham" wrote > > > > > > > > > regarding Re: 40mm weber ram tubes: > > > > > > > > > > > > > > > > > > > > > > > > > > You could try Four Plus Performance in Brisbane ( i don`t > > > > > > have the > > > > > > > > > number) , > > > > > > > > > > or Autosport in Vermont, Datrally in Cheltenam. > > > > > > > > > > > > > > > > > > I know i had a few spare somewhere, i will have to look. > > > > > > > > > > > > > > > > > > Kris. > > > > > > > > > > ----- Original Message ----- > > > > > > > > > > From: "Richard Webb" > > > > > > > > > > To: > > > > > > > > > > Sent: Tuesday, June 24, 2003 1:39 PM > > > > > > > > > > Subject: 40mm weber ram tubes > > > > > > > > > > > > > > > > > > > > > > > > > > > Hi guys, > > > > > > > > > > > > > > > > > > > > > > Can anyone tell me where abouts I might be able to get > some > > > > > > > > weber ram > > > > > > > > > > > tubes/pods/trumpets (whatever you call them). The guy at > > > > > > > > unifilter> > > thaught he had some but doesnt anymore! Now > I've > > > > > > > > rang up a few places > > > > > > > > > > > and they are telling me no one makes them anymore??? > > > > > > > > > > > > > > > > > > > > > > Im in melbourne and would be interested in any info on > > > > > > where to > > > > > > > > > > > purchase them. > > > > > > > > > > > > > > > > > > > > > > Thanks in advance, > > > > > > > > > > > > > > > > > > > > > > Richard > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > --membersozdat------------------------------------------------- > > > > > > ---- > > > > > > > > -- > > > > > > > > OZDAT Mailing List Please Note:- > > > > > > > > Send (un)subscribe requests to [EMAIL PROTECTED] > > > > > > > > Send submissions to [EMAIL PROTECTED] > > > > > > > > No unauthorised redistribution of this email > > > > > > > > http://www.ozdat.com/ozdatonline/index.htm > > > > > > > > http://www.ozdat.com/ozdatonline/listindex.html > > > > > > > > http://www.mail-archive.com/[EMAIL PROTECTED]/ > > > > > > > > > --------------------------------------------------------------- > > > > > > ---- > > > > > > > > -- > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > --membersozdat----------------------------------------------------- > > > > > > -- > > > > > > OZDAT Mailing List Please Note:- > > > > > > Send (un)subscribe requests to [EMAIL PROTECTED] > > > > > > Send submissions to [EMAIL PROTECTED] > > > > > > No unauthorised redistribution of this email > > > > > > http://www.ozdat.com/ozdatonline/index.htm > > > > > > http://www.ozdat.com/ozdatonline/listindex.html > > > > > > http://www.mail-archive.com/[EMAIL PROTECTED]/ > > > > > > > ------------------------------------------------------------------- > > > > > > -- > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[EMAIL PROTECTED]/ ---------------------------------------------------------------------
