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On 5 Mar 98 at 8:13, Big Al wrote: > Well, I figure that since most race teams have just as much research behind > them as Gene Berg, and they race to put bread on the table (kind of a "no > win, no eat" situation), and they stive to polish intakes and ports to > improve these odds, there is probably something to it. > > The question is, would there be an advantage? Our 54hp (or some odd with > modifications) engines probably would not have much effect. Am I right Jim? Good air flow brings advantages to any engine. It is essentially "free" horsepower. I think the only real debate here is which approach here really works. I suspect that there are many variables and that it is hard to generalize. As to what real racing teams do, I suspect that they never publish anything that they feel confers any real advantage--at least until it is already so widely known that there is no loss in doing so. > >Just because something is obvious doesn't mean that it is true. > >Actually, I'm not sure of this either, I don't own a flow bench and > >have no experience with one, but I got this information from someone > >who owns and uses one. His feel for these things is usually good. > >I don't recall if Gene Berg had any comments on this. He's usually > >done his homework, too. > > > > And I thought he offered ported and polished VW heads... Or was that just ported intakes, and possibly polished combustion chambers and exhaust ports > Air (and fuel) volume is a contributing factor to HP's. This is fact, not > just conjecture. Agreed > >> Rough pipes decrease the flow velocity of the air which makes the engine > >> starve for fuel mixture right? I can see the "rough causes mixture" in > >> theory, but if this is so, wouldn't VW have added a texture to the pipe? > > VW did their research too. Yes, but they also had pricing constraints. > >> And for polishing the exhaust manifold... Where? Do you mean the interior > >> of the heater boxes? I am unclear as to the location you mean. > > > >This comment was general. In our VWs I agree that there is no need > >for any polishing in the heater boxes because the pipe ID is already > >smooth, but there is some advantage to smoothing the interior of the > >exhaust ports in the heads. > > Now this is an interesting idea. How much lower head temp (ballpark) could > one acheive by doing this, and as you stated "The fact that someone wants > something doesn't mean that there's an advantage to it. " is there an > advantage? I'm pretty sure there is some advantage, I just don't know how much or even if it is noticable. > I would suggest to John that if he wants to clean the interior of the > intake, use a bottle brush attached to a flexible extension shaft on a > power drill and (although somewhat blindly) work it through the intake to > remove corrosion and or debris. Or get them bead blasted while they are disassembled. Jim - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA *******************************