John,
Though I'm running a turbocharger on my 1275 and not a supercharger, they
both will provide about a 6lb charge to the cylinders. I went through two
sets of pistons thanks to detonation during the learning phase of getting
the car set up.
I burn 93 octane 'Premium" without any octane boosters. I used a small
piece of tubing slipped over the post in the dizzy to limit the total
advance(as I recall I lopped off 2deg of dizzy timing equalling 4 degrees
crank timing). I also set the timing to 5deg. at idle. On top of that, I
never run a lean setting and use an oxy sensor to guarantee that.
Since those changes I've not blown any pistons, I don't overheat, and I
boost often to 5 lbs and once in awhile I boost as high as 10lbs.(briefly).
I'm running the low compression pistons with a ported head and an old Isky
MM55 cam. I'm sure the mileage suffers due to sub-optimal timing and rich
setting, but a turbocharged Sprite is not about mileage. (21mpg when
'boosting' like a looney on the weekends, 28 mpg cruising in 5th on the
freeway.)
Presented for what its worth, good luck with your supercharger. By the way,
weren't those designed for the volumes of a 948cc motor? Do you anticipate
any problems due to this?
Glen Byrns
> Thanks for the info Tim. I got the fax. I am thinking that the oiler for
> the Supercharger is going to supply plenty of lubrication for the valves
and
> valve stems, so I don't think I need the lead substitute anymore. Even
> though the article you sent seems to caution against using the octane
> booster, I think I'll try using it,s ince a supercharged engine can have a
> need for higher octane than a normally aspirated one. I will probably
> experiment with, and without, to see if I really need it. I'll post my
> findings to the list
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