One step ahead of you. Read through catalog at lunch. Teflon good up to 450 degress, but not very compressible. Apparently impervious to anything you throw at it, but am hoping diagnosis days are over. Have already decided on Viton. Catalog warns "not for use with hot water and steam" -- something tells me my last set from plumbing supply house weren't Viton. Martin G is one concerned about CPR. Am asking him to look up price because information is free. My hard metal fuel lines don't lend themselves well to a pressure gauge. In fact, can't even remove banjo bolt at top of fuel distributor (walls of 2 different sockets too thick). I just leave attached and take loose at that funny canister attached to my CPR. Will try to engineer attachment for pressure gauge if latest manifold set doesn't work. Oh, my CPR doesn't have the vacuum nipple you speak of. Is a stanchion right next to electrical connection just like DeLo, but I think that's a vent. Bill Robertson #5939 >--- In DMCForum@xxxxxxxxxxxxxxx, "checksix3" <jetjock11@xxxx> wrote: > > I should know better but... > > >>Don't think they can handle the heat. This time will > buy a set of industrial teflon.<< > > That could be a mistake unless you know exactly what compound you're > getting. "Teflon" is a trade name, there are many different types of > fluoroelastomers. You'd better know what your getting or you'll be > doing the job again. A better choice is fluorocarbon (trade name of > Viton), it provides the best all around qualities for this > application. I suppose Nitrile would also work but Viton is superior. > If it's heat resistance you want silicone is the ticket as long as > you put stop spraying solvents like acetone or MEK on the engine. > > >With all due respects to your wonderful European buzzy engine > designers, would it have killed them to use a few more bolts to hold > intake down? Ford saw fit to use no fewer than 10.< > > An excessive number of fasteners will have no bearing on sealing. > It's dependent on the quality of the seal groove as well as proper > seal dimension and elastomer compound selection for the application. > The pissy low pressure in your engine is nothing compared to > something like 10-7E torr, a level routinely sealed by elastomers > using only a few bolts. Now if your manifold or head is really > warped, thats a different story. > > In addition, the force generated by atmospheric pressure against the > large surface area of your intake manifold when under vacuum is > considerable. If it fits properly and the sealing surfaces are > correctly designed and in good condition with the right O rings used, > the number of fasteners will have little to do with sealing. There > may be more in your Ford but it's not for the reason you think. > > >Am not opposed to replacing CPR, but need Darren to look up Renault > output pressure vs units DeLo vendors are selling. No sense buying the > wrong one.< > > Why do you think your CPR is a problem? Why don't you simply test it > before replacing? Have you measured control pressure on the engine > cold, with the RPM relay out and jumpered to *only* run the fuel > pump? (Remove the CPR connector to be sure) Have you tested for > maximum control pressure? > > >>That's why I sealed in bed of silicone last time I had intake off. > Am not real impressed with these neoprene or whatever O rings.< > > Bed sealing of the manifold?? Yikes. CIS removed, different CPR, > possible improper seal selection, etc...hasn't it occured to you > other's don't need all this to make the engine run properly? Don't > you realize the more you do this kind of stuff the more difficult it > could be to get where you're want to go? Yahoo! Groups Sponsor ADVERTISEMENT <http://rd.yahoo.com/M=244522.3707890.4968055.1261774/D=egroupweb/S=170512 6215:HM/A=1595053/R=0/SIG=124gf29oe/*http://ashnin.com/clk/muryutaitakenat togyo?YH=3707890&yhad=1595053> Click Here! <http://us.adserver.yahoo.com/l?M=244522.3707890.4968055.1261774/D=egroupm ail/S=:HM/A=1595053/rand=634172294> To unsubscribe from this group, send an email to: DMCForum-unsubscribe@xxxxxxxxxxxxxxx Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service <http://docs.yahoo.com/info/terms/> .
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