[Spridgets] Groovy engine

fastvee fastvee at yahoo.com
Mon Jan 4 06:12:28 MST 2010


Hello Cap'n Bob,
His wording made me scratch my head also. Is it possible the advance setting
he refers to is total advance? That could make sense because improving
combustion efficiency requires less total advance, and it could be closer to
TDC by 4-6 degrees.
John
Fogelsville, PA

--- On Mon, 1/4/10, Robert E. Shlafer <pilotrob at webtv.net> wrote:

From: Robert E. Shlafer <pilotrob at webtv.net>
Subject: Re: [Spridgets] Groovy engine
To: "Hal Faulkner" <frog.aye at gmail.com>, "Ron Soave" <soavero at yahoo.com>
Cc: "Spridget Chat Group" <spridgets at autox.team.net>
Date: Monday, January 4, 2010, 4:29 AM

Assuming one began from an original recommended ignition setting further BTDC
to an ignition setting closer to TDC, the result would be reduced "timing"
rather than increased "timing" and torque would suffer in the process, ALL
ELSE BEING PERFECTLY EQUAL.

Fr'instance....a normal static setting for a street-stock 1275 would be 7
degrees BTDC with most stock mfg's combo vac/mech dizzy.

Reducing this to 3 degrees BTDC to bring it closer to TDC would be "retarding"
timing from that recommended as optimum by the manufacturer using recommended
octane, thus reducing torque on acceleration.

Cap'n. Bob      '60 :{)


-----Original Message-----
From: Hal Faulkner
Sent: Thursday, December 31, 2009 1:17 AM
To: Ron Soave
Cc: Spridget Chat Group
Subject: Re: [Spridgets] Groovy engine

I like the fact that:
"Eliminating ping (also called "knock" or detonation) allows for an advance
setting that is much closer to top dead center (TDC) to get more power from
each stroke of the Piston.  This quality of a Grooved engine also allows a
higher compression ratio with the use of regular octane fuel, thus adding
more irovements (*sic*) to the quality of combustion and preventing knock,
or worse, 'pre-ignition'...."

Makes perfect sense to me.

Hal


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