I have run Flat tops on a 1275 in a Morris Minor I built several years
ago.... Yeah I am a weirdo... but how many folks you know want to Race on
Salt?
anyway.. there are several disadvantages of 11.5 - 12:1 compression...
mostly the opportunity to keep a Can of Race gas available to run the dam
thing ....The Higher the Compression ratio the slower you want the fuel to
burn... in our 10:1 motor we ran Aviation Fuel.... in the 14:1 Motor we ran
112-118 octane Racing fuel... and we are back to a 11:1 motor for the Meet
this weekend..(back up motor) but the overlap and size of the valves
coupled with a .680 lift cam... means we have to go back to Race fuel...
Now on to the JP 4 part.... Jet Fuel is nothing more then Low Grade
Kerosene... I will grant you that it is Highly Filtered.... but it isn't a
Great High Compression fuel.... a Turbine engine will run on about
anything.... from Kerosene to Diesel to Low Lead to Pump gas.... it just
changes the Exhaust or Turbine outlet temp.
Keith Turk
100/4 , Bugeye, Box Sprites... the Camaro LSR... and of course about
5000 hrs in an Attack helicopter.....
----------
> From: Palmer Family <amesfolks@snovalley.com>
> To: Frank Clarici <spritenut@Exit109.com>; HealeyRic2@aol.com
> Cc: ulix@u.washington.edu; mgs@autox.team.net; spridgets@autox.team.net
> Subject: Re: HELP with rings etc. 1275 midget (and a new car!)
> Date: Monday, May 31, 1999 8:53 PM
>
> It would be extremely high compression, but I was going to start running
> premium (92octane) after my head rebuild. Are there any major
disadvantages
> to the higher compression?
>
> TIA, Barry
> -----Original Message-----
> From: Frank Clarici <spritenut@Exit109.com>
> To: HealeyRic2@aol.com <HealeyRic2@aol.com>
> Cc: ulix@u.washington.edu <ulix@u.washington.edu>;
amesfolks@snovalley.com
> <amesfolks@snovalley.com>; mgs@autox.team.net <mgs@autox.team.net>;
> spridgets@autox.team.net <spridgets@autox.team.net>
> Date: Monday, May 31, 1999 8:26 PM
> Subject: Re: HELP with rings etc. 1275 midget (and a new car!)
>
>
> >HealeyRic2@aol.com wrote:
> >>
> >> Listers,
> >>
> >> I have some spare 1275 pistons that Barry can have for the cost of
> shipping
> >> if new rings won't solve his compression problems. They're not exact
> >> replacements and I'm seeking the collective knowledge of the list to
make
> >> sure they'll work before I send them out. They are +.020 flat top
1275
> >> pistons with 4 rings, (two compression, two oil control, with one oil
> control
> >> below the wristpin) They are of the "W" skirt design
> >> (split skirts look they have a "W" slotted in). I got them as part of
a
> >> group of spares from a Mini racer.
> >>
> >> Daniel, can you name that piston?
> >>
> >> Rick Neville
> >> Rowley, MA
> >> AN5, BJ7
> >
> >Rick
> >
> >I can not immediatly identify those pistons but flat tops in an everyday
> >driver would really boost the compression.
> >I would not recommend it based on past expierience.
> >My son had flat tops in his Mini, I think JP4 jet fuel still would not
> >stop the pinging.
> >Even stock high compression pistons for a 1275 are dished.
> >
> >--
> >Frank Clarici
> >Toms River, NJ
> >Bugeye Sprite
> >67 Sprite
> >59 A40
> >http://www.exit109.com/~spritenut/
> >
>
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