On Tue, Nov 25, 2014 at 10:17 PM, Leonardo Marsaglia < [email protected]> wrote:
> > > As always I like how you describe things like this :). I'm really out of my > field wich such a monster like that, but I can imagine that phenomenal gas > mileage back then is almost against the law by today standars. I recall > talking to somebody a while ago when I was researching about induction > heating for camshafts, and the reason most engines are going from flat > tappets to roller tappets is because zinc was no more a legal component in > motor oils and to avoid premature wear the only reason is to use a system > with less friction. I don't remember but the person I talked to may be > from this list. > > Anyway, I remember that because the person told me that there are lot of > old monster like the one you mentioned that needed camshaft rebuild because > the newer oils are far worse for systems without rollers. > > > -- > *Leonardo Marsaglia*. > You can also more finely tune a cam with roller lifters as there's a different contact area with roller lifters than flat ones. I've seen some pretty radical cam configurations for circle track racing that would be next to impossible to use with flat lifters. Generally you can get higher rpms out of roller lifters too, since you typically don't get as much valve "float" with rollers versus flat. Way back when, I built a small block Chebby (started out life as a 350 ci with 4-bolt mains). First step was to bore it out 90 over. We then did all the usual nifty stuff (blueprinting, etc), We used Carillo rods, got some 13.5:1 pistons, aluminum high velocity heads, that were flowed and smoothed, a very good low-midrange grunt circle track cam, and topped it off with a Holley 750 double-pumper. Dyno testing of the engine showed it put out over 800 HP. Dropped that into my 1969 Z28. Hoooo, what a ride! ;-) ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
