Frank;
Unfortunately the side that you can get rid of is on the bottom. So their
really isn't much of a gain ( i would think ) until you are at WOT. Which
either side that you remove will you will have to weld/ braze the center in
place so to have the support in the middle.
I brazed the center with the throttle plates in the shaft so I would know
how much to leave when cutting the rest off. I really don't know how much of
a flow gain there is by doing this but it sure seems that there would be
some. I used to do this on Tillitson carbs in my Go-karting days, it sure
made those things flow a lot more. I do have a homemade flow bench that I
used to use when building 4-cycle kart engines, but you cannot tell the cfm,
only is good to compare one to the other. I guess I should dig this thing
out.
I didn't coat it yet but it has been done for a bout a month and still looks
good ( no rust or discoloration ). I think the shafts are anodized. I would
like to get some Holley 2" plates but haven't tried to locate a place to get
them at a good price. The throttle plates are a lot thinner than the thick
aluminum ones that we have.
See Ya Colin
Holloway,Frank T wrote:
> Colin,
> Sounds like a GREAT idea. I was going to mill flats on the shaft anyway.
> I don't have the shaft sitting here in front of me and don't remember
> whether the
> heads were on the top of the plate or the bottom, but I would think that
> you would want to remove the half on top, that way you would still have
> the support of the
> shaft between the bores. After you finished with your modifications, did
> you coat the throttle shaft with anything, (looks like black oxide to me
> but it feels to
> smooth). Again thanks for the info.
> Frank
>
> > -----Original Message-----
> > From: Vincent Heckathorn [SMTP:victorylane@iwaynet.net]
> > Sent: Saturday, August 22, 1998 9:03 PM
> > To: dakota-truck@buffnet.net
> > Subject: Re: DML: Throttle Bodies Attn. Patrick
> >
> > Frank;
> > FWIW!!!
> > I have done a little something different on the throttle shaft. I have
> > removed 1/2 of the shaft, the side that the bolts go through, then you
> > can
> > cut the back side just a little and use #10/32 round head machine
> > screws and
> > bolt the plates to the shaft.
> > This seemed to wake up the engine a little.
> >
> > colin
> >
> > Holloway,Frank T wrote:
> >
> > > Patrick,
> > >
> > > I started work on two throttle bodies today and I found some
> > > real interesting things. I was concerned about a dead spot off idle,
> > and
> > > was thinking about
> > > re-clocking the TPS. I talked to one of my friends at
> > Chrysler,
> > > it turns out that re-clocking will not work. The ECM on startup
> > looks
> > > for the lowest voltage from
> > > the TPS and sets the voltage as baseline (no adjustments). I
> > did
> > > flow one of the stock TB's at different throttle settings so I have
> > a
> > > baseline for my work. One
> > > of the TB's will get 52MM plates (approx. 2.040 inch). The
> > other
> > > will use the stock throttle plates ( just under 2.00 inch). The
> > stock
> > > TB's are actually necked
> > > down just above the plates ( this is actually there to
> > shroud
> > > the half of the plate(s) that swing up). Un-shrouding occurs at
> > approx.
> > > 15 degrees throttle
> > > movement. On the TB that will receive stock plates, I opened
> > the
> > > bore above the plates .040 inch, and then I took and additional
> > .020
> > > off the bore on the
> > > back side (rear of the engine where the plates swing down).
> > and
> > > blended the work to the actual bore where the plates are positioned.
> > On
> > > the TB that gets the
> > > big plates, I just bored the TB to match the plates. The
> > next
> > > step will be to place both TB's up in one the lathes (4 jaw chucks
> > work
> > > nice to center the bores)
> > > and open up the air horn and remove the web between the
> > bores.
> > > The shafts will be the next (mill flats above and below the plates.
> > I'm
> > > hoping to finish both
> > > tomorrow and then off to the flow bench. I'll give you the
> > flow
> > > numbers when I'm done. I do have your TB down at the shop. Tomorrow
> > I'll
> > > take the IAC, MAP,
> > > and TPS off. It should be on its way to you either Monday or
> > > Tuesday.
> > > Frank
> >
> >
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