Oh yes. In fact a hundred thou is quite common in some circles.
And you do some roundy rounder racing, right Mark? It was my understanding that
Chris is running on the street and is having the preignition issue. I certainly
don't doubt it for a minute after the mods.
My point was that if one goes for the high-performance goodies then one has to
pay the modern day piper with the fuels we have. sigh, for the 'good old
days' of Union 76 Hi Test.
Course that's why my 'other' car is a Ranger pickup with a 4 cylinder that runs
on 87 octane.
"Haynes, Mark" wrote:
> Jim- Taking .100" off of the head isn't unheard of, in fact, the comp. prep
> manual states that to get the necessary comp ratio, the head needs to be
> milled .125". we run a head with .120" off, stock flattop +.040" spit
> pistons, and one of Ted's cams. I can't complain about the performance, we
> keep up with the front running GT6s and give them a run for their money.
> We've never had a problem with pinging, but then, we run a 50/50 mixture of
> 112 and 91 Octane fuels. Timing for our 1296 is 32 degrees total advance, at
> this altitude (5000'-8500'), it's what the dyno power tuned it to for best
> power.
> Chris, are you running a weber, or a pair of SUs? Did you re-needle
> the SUs for the increased richness the compression ratio needs?
>
> Mark Haynes
> '65 Spit racer
> RMVR #162
>
> > -----Original Message-----
> > From: Jim [SMTP:jdeatsc1@rochester.rr.com]
> > Sent: Monday, September 20, 1999 6:58 PM
> > To: Ted Schumacher
> > Cc: Chris Pappathopoulos; spitfires@autox.team.net
> > Subject: Re: Spitfire ping
> >
> >
> > Chris,
> > you had a HUNDRED thousandths taken off the head?
> >
> > seems like a little much to me. Was this for performance or to make the
> > head
> > flat?
> >
> > If it was for performance then get what you pay for. Grin.
> >
> > Is the distributor advancing too much?
> >
> >
> >
> >
> >
> > Ted Schumacher wrote:
> >
> > > Chris Pappathopoulos wrote:
> > > >
> > > > I am having trouble with my Spit pinging since I rebuilt the engine.
> > To
> > > > refresh your memory it is a 74 with the flat top 9:1 pistons and .100
> > > > milled off a previously stock head. I had a 3 angle valve job done,
> > > > tubular pushrods, double valve springs, and off hand I think a
> > TSI275-4
> > > > cam. Everything else is currently stock. I am using 93 octane gas (the
> > > > highest readily available in WI). Under load such as a moderate uphill
> > > > or hard acceleration the engine will start pinging. I'm probably
> > usually
> > > > turning at least 2500 rpm. If I try to retard the timing any the
> > engine
> > > > dies at idle. It is currently idling at 1500 rpm. I don't have the
> > exact
> > > > timing number as I have no timing light at college. Any ideas?
> > > >
> > > > Thanks
> > > > Chris Pappathopoulos
> > > have someone check the distrib and find out what you have for total
> > > advance and when it comes in. then reset the timing based on these
> > > numbers. with this combination you should be running about 36 degrees
> > > total timing. call chris at foreign car specialists. ted
> > > --
> > > Ted Schumacher
> > > TS Imported Automotive
> > > 404 Basinger Rd.
> > > Pandora, Ohio, USA 45877
> > > Ph. 800/543-6648 USA/Canada FAX 419/384-3272 24 hour
> > > Ph. 419/384-3022 - tech./general information
> > > Web page http://www.tsimportedautomotive.com
> > > New-Used-Rebuilt-NOS-Performance British car parts.
> > > 200 - 300 parts cars in our British-only salvage yard.
> >
> > --
> > Rawchester, Neu Yawk
> > Sptifire MkII "HardWay" FC68436L Red, what else?
> >
--
Rawchester, Neu Yawk
Sptifire MkII "HardWay" FC68436L Red, what else?
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