Thanks for that Justin. Cheers Feral Errol
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Justin Friedrichs Sent: Wednesday, 20 February 2002 11:14 AM To: '[EMAIL PROTECTED]' Subject: RE: New CAMS Rules for Sports sedans Errol, Thats cool, its also got to do with the quenching effect related to a cold, high alloy steel has when it is welded. They go harder when quenched (just from not preheating the area being welded) and become more brittle, something you don't want in roll cages. At the grain boundaries of the material being welded, hydrogen is trapped and after a while the weld can crack. But your right, heat does stress relieve the welds allowing it to be more ductile. Justin > -----Original Message----- > From: E Smith [SMTP:[EMAIL PROTECTED]] > Sent: Wednesday, February 20, 2002 10:16 AM > To: [EMAIL PROTECTED] > Subject: RE: New CAMS Rules for Sports sedans > > Justin, > Thanks for that, it makes sense. > I thought there was also something to do with temperature difference > between > the weld and the material being welded causing stress after weld cooling. > By doing the weld with the material closer to melting temp, the material > tended to normalise and have low stress on weld boundaries. > > Cheers > Feral Errol > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]]On Behalf Of Justin > Friedrichs > Sent: Wednesday, 20 February 2002 8:50 AM > To: '[EMAIL PROTECTED]' > Subject: RE: New CAMS Rules for Sports sedans > > Errol, > No you don't need to put the material in an oven, but it does need to be > preheated to a certain temperature (depending on the material).This is > done > so there is not a huge temperature change in an isolated area (wot welding > does). If the material is not pre heated it is susceptible to hydrogen > embrittlement, which means it absorbs hydrogen from the atmosphere and can > just fall apart at anytime. > > Justin > > > -----Original Message----- > > From: Craig Coffey [SMTP:[EMAIL PROTECTED]] > > Sent: Wednesday, February 20, 2002 5:30 AM > > To: [EMAIL PROTECTED] > > Subject: Re: New CAMS Rules for Sports sedans > > > > Most guy's over here just give the cage a warm up with a gas torch and > > heating tip after welding. > > > > Craig > > ----- Original Message ----- > > From: "E Smith" <[EMAIL PROTECTED]> > > To: <[EMAIL PROTECTED]> > > Sent: Wednesday, February 20, 2002 12:29 AM > > Subject: RE: New CAMS Rules for Sports sedans > > > > > > > James, > > > I was always under the impression that the range of chrome steels > could > > only > > > be tigged in a pre-heated oven to prevent alteration haloes around the > > weld > > > area and subsequent element depletion. This was supposed to cause > stress > > > concentrations on the weld transition areas to the parent metal. Have > > you > > > heard of this at all or any other listers, or is it just crap. > > > Cheers > > > Feral Errol > > > > > > -----Original Message----- > > > From: [EMAIL PROTECTED] > > > [mailto:[EMAIL PROTECTED]]On Behalf Of James > Fitness > > > Sent: Tuesday, 19 February 2002 10:12 PM > > > To: [EMAIL PROTECTED] > > > Subject: Re: New CAMS Rules for Sports sedans > > > > > > My plan was always to add ballast... but nearly 200kg is a bit much I > > think > > > > > > I also have a 15 kg lead bar here... so all I need is another 11 or 12 > > of > > > them > > > > > > You can see from the size of just one of those bars that another 11 of > > those > > > is > > > going to be an awful BIG pile... > > > > > > 975kg is more than an EXA weighs from the factory! > > > Maybe I need a bigger car :) > > > > > > Or if I replace all the alloy sheet with steel sheet and get the cage > > made > > > from > > > mild steel instead of chrome-mag... that will bring it up 50 to 100kg > > (and > > > probably save me heaps of money too I guess) > > > Though I wanted to use the chrome-mag (680+MPa) for the cage (you can > > > use it but you have to have it homologated) as it's stronger than > chrome > > > moly (650MPa) and Mild Steel (350MPa)... > > > > > > damm rules :) > > > cya > > > James > > > > > > > > > > > > > > > Zac Campbell wrote: > > > > > > > hey James you gotta make it as light as you can anyway, and tehn use > > some > > > > ballast in the middle of the car, F1 style!! > > > > I think they use tungsten - anyone got any lying around? :) > > > > I have 15kg of lead you can have! :D > > > > > > > > ----- Original Message ----- > > > > From: James Fitness <[EMAIL PROTECTED]> > > > > To: membersozdat <[EMAIL PROTECTED]> > > > > Sent: Tuesday, February 19, 2002 5:18 PM > > > > Subject: New CAMS Rules for Sports sedans > > > > > > > > > Hi All > > > > > > > > > > Just got my new CAMS Manual today.. and read some > > > > > not so good news for those with SR20DET's and FJ20DET's etc > > > > > in their Datto sports sedans... > > > > > There is now a new Racing weight Minimum of 975kg > > > > > We have been bumped into the 3.5 to 4.5l class > > > > > There is a new rule - > > > > > over 1500cc turbo with more then 2 valves per > > > > > cylinder= multiply engine capacity by 1.3 > > > > > This added to the old and still standing rule of > > > > > multiply by 1.7 for turbos means > > > > > 2.0L x 1.3 x 1.7 = 4.42L > > > > > > > > > > I have rung cams and the verified that both multiplication factors > > > > > are to be applied. > > > > > > > > > > So much for the 750 - 800kg monster I was building - 975 is a real > > kick > > > > > in the you know what's - that's like having 3 or 4 extra people > my > > size > > > > > in > > > > > the car :( > > > > > > > > > > Now if I was running a Z20ET - with only 2 valves I can drop off > the > > > > > x1.3 > > > > > so 2.0L x 1.7 = 3.4L with falls into the 900kg class > > > > > > > > > > So now I have to figure if an extra cam and 2 more valves per > > cylinder > > > > > is better > > > > > than a 75kg weight saving... > > > > > What do you think?? > > > > > > > > > > cya > > > > > James > > > > > > > > > > > > > > > -- > > > > > > > ________________________________________________________________________ > > > > > > > > > > James Fitness > > > > > Director > > > > > Data Scribe Australia Pty Ltd > > > > > http://www.datascribe.com.au > > > > > Computers and Supplies > > > > > > > > > > OZDAT Online > > > > > http://www.ozdat.com/ozdatonline/index.htm > > > > > > > > > > > > > > > > > > > > > > > > > -- > > > > ________________________________________________________________________ > > > > > > James Fitness > > > Director > > > Data Scribe Australia Pty Ltd > > > http://www.datascribe.com.au > > > Computers and Supplies > > > > > > OZDAT Online > > > http://www.ozdat.com/ozdatonline/index.htm > > > > > > > > > > > > > > > > --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]/ ---------------------------------------------------------------------
