Ed,
Let me add to that the fact that by increasing the size you will also
effectively reduce the pressure since there will be less resistance to
the oil flow!
Joe
Edward Hamilton wrote:
>
> Michael,
> If you increase the diameter of the oil gallery, you effectively increase
> the volume, not the pressure.
>
> Regards,
> Ed Hamilton
> ----- Original Message -----
> From: "Nolan Penney" <npenney@erols.com>
> To: "Graziano, Michael" <michael.graziano@csfb.com>
> Cc: <spitfires@autox.team.net>
> Sent: Monday, February 21, 2000 9:27 AM
> Subject: Re: 1500 head modification questions and others (kinda long)
>
> >
> >
> >
> > "Graziano, Michael" wrote:
> >
> > > 1. From the John Twist article and list member suggestions "draw out
> the
> > > oil pump shaft housing and increase the diameter of the center oil
> gallery
> > > from 1/4 inch to 5/16 inch (doubling the cross sectional area, hence
> > > doubling the oil available). "
> > >
> > > Can this be done without having to dismantle the entire engine? I'd
> like
> > > to do this as the engine oil pressure can get REALLY low in the summer
> when
> > > it's hot, but I also don't have an endless supply of cash.
> >
> > Your low oil pressure problem is almost assuredly wear, which this will
> not
> > address. If you really want to fix the oil pressure problem, tear the
> engine
> > down, and at least replace the bearings.
> >
> > > 2. Also, port and shave the head. I've been reading the "Theory and
> > > Practice Of Cylinder Head Modification" by Vizard. I'm not very far
> yet,
> > > but with almost two hours of commuting time a day, I'll have read a lot
> > > (maybe the whole thing) within a few weeks. How difficult is this?
> Vizard
> > > makes it seem that anyone with a brain, and a few tools (like a dremel
> w/
> > > flex shaft) can port and polish a head. Is this a realistic approach
> for me
> > > to take? Can it be done by a shade tree mechanic?
> >
> > It takes no great skill to operate a grinder. Removing metal isn't
> difficult.
> > Removing metal in a way that doesn't destroy the head and improves air
> flow,
> > that's a horse of a different color. To do that, you need a flow bench,
> and
> > several heads to destroy as you learn. You can make a flow bench easily
> > enough. And you can destroy heads easily enough experimenting. Will you
> have
> > learned enough to actually improve the flow and performance of the engine?
> > Honestly, doubtfull.
> >
> > Not only is porting and polishing tuned for specific applications, it's
> specific
> > to the engine. As in where are the water passages, what are actual
> > restrictions, etc. You are best served by having a shop that is
> experienced in
> > your specific engine do the work. They are the most likely to get you
> good
> > results, without destroying your head. Off hand, I'd suggest you contact
> > Paeco. They are expensive, but they seem to be very good, and quite
> experienced
> > with Spitfires.
> >
> >
> >
--
"If you can't excel with talent, triumph with effort."
-- Dave Weinbaum in National Enquirer
|