Re: 273 Rebuild status and how much compression we can run on pump gas w/10.5 m

[Tom Watters <tomwatters@xxxxxxxxxxx>]

Gary, thats a good question. 

I'm putting back in it what was in it, just a little larger bore.  The 
stock hipo 273 pistons came above the deck, looks like a pretty snug fit 
into the head.

The engine never pinged on me before, but I was running 87 or 89 octane 
in it.  I know they're not quench pistons, but I have to wonder why it 
didnt have pinging problems before.

If I do have pinging problems, Rebel does have high-test that I can 
experiment with.  ie, 12 Gals of 92 octane plus 2 gallons of 100 octane 
would probably do it.

I hope to not be doing the octane boost thing.  We'll just have to see 
how it is once built.

:-)

Gary Pavlovich wrote:
> Tom,
>
> With 10.5 pistons you will raise your compression considerably more 
> than most pump gas will handle.  What fuel will you be using and will 
> you be adding an octane booster or a bit of "race" fuel?
>
> I have been researching the correct octane level for 10 to 10.5 to 1 
> true compression motors and would appreciate any research/experiential 
> input from our list members.
>
> Gary Pavlovich
> ----- Original Message ----- From: "Tom Watters" <tomwatters@xxxxxxxxxxx>
> To: <1962to1965mopars@xxxxxxxxxx>
> Sent: Thursday, January 21, 2010 7:54 PM
> Subject: Re: 273 Rebuild status
>
>
> > Steve,
> >
> > Good Point.  The New pistons will require that, even with all the 
> > manual checks Egge does, there's still the need when adding pistons 
> > and pins that something might be askew.  Dont want to flub up the 
> > forged crank.
> >
> > Will have to add it to the list.  Appreciate it.
> >
> > --Tom
> >
> > Steven Charette wrote:
> > > Tom,
> > > You got money tucked away to rebalance the rotating assembly?
> > >
> > > SC
> > > -----Original Message-----
> > > From: Tom Watters [mailto:tomwatters@xxxxxxxxxxx] Sent: Thursday, 
> > > January 21, 2010 10:14 PM
> > > To: 1962to1965mopars@xxxxxxxxxx
> > > Subject: 273 Rebuild status
> > >
> > > Well, it looks like I'll be rebuilding the 273 rather than just a 
> > > refresh
> > > (Rings & beargings).  Needs boring, which means pistons and the like.
> > >
> > > After bumping around on the phone, I got some good recommendations 
> > > of friend
> > > of the the local car club president for a machine shop.  It seems to 
> > > be on
> > > the high end of average, but I can tell he does know his stuff.  When I
> > > talked to Nellis Machine or Las Vegas Crank and Machine, they didnt 
> > > leave me
> > > with a comfortable feeling about taking in my original block to 
> > > them.  I
> > > told HBR Competition Engies I will be dropping off the Block, Heads, 
> > > Crank
> > > and Pistons tomorrow afternoon.  Total for Bore (175-200)/Crank Turn 
> > > (95)/Cam Bearing install
> > > (75)/re-condition rods (25-35) is at a 500-600, depending.
> > >
> > > This will cause me to buy pistons. Only one company makes (egge) the
> > > 10.5:1s, Those will run about $300
> > >
> > > Cam/Lifters from Racer Brown is now on Order $235+Tax.  Ordered # 
> > > ST-1 -
> > > Mechanical Cam.  Its a little lumpier than the stock HiPo Cam (450 lift
> > > instead of 425), but not as big as the D-Dart race cam (495 lift).  It
> > > should give me what I want.
> > >
> > > So barring a ton of head work, the rest of the parts I'm looking at 
> > > will be
> > > about $300 (Timing Chain, Teardown set, Freeze Plugs, Bearings, 
> > > Rings, etc)
> > >
> > > Total for a full rebuild minus head work, I'm looking at $1435.  if 
> > > I need
> > > head work, Usually about another $200-$500
> > >
> > > If He were assembling, it'd be another 1000 or so.
> > >
> > > Now to get the taxes submitted so I have the funds to pay for it 
> > > with my
> > > return.  ;-)
> > >
> > > Regards and Happy Moparing.
> > > --Tom
> > >
> > >
> > > ----
> > > Please address private mail -- mail of interest to only one person 
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> > >
> > > 1962 to 1965 Mopar Clubhouse Discussion Guidelines:
> > > http://www.1962to1965mopar.ornocar.org/mletiq.html and 
> > > http://www.1962to1965mopar.ornocar.com/general_disclaimer.html.
>
>
> ----
> Please address private mail -- mail of interest to only one person -- 
> directly to that person.  I.e., send parts/car transactions and 
> negotiations as well as other personal messages only to the intended 
> recipient, not to the Clubhouse public address. This practice will 
> protect your privacy, reduce the total volume of mail and fine tune 
> the content signal to Mopar topic.  Thanks!
>
> 1962 to 1965 Mopar Clubhouse Discussion Guidelines:
> http://www.1962to1965mopar.ornocar.org/mletiq.html and 
> http://www.1962to1965mopar.ornocar.com/general_disclaimer.html.