[DeTomaso] Compression Ratio Question

[asajay at asajay.com]

Okay, so I don't know the specific CR, but here is what I built and it  
runs great:

Off the shelf hyperuetectic flat top pistons for 351C .030 over
Stock Rods and crank (no stroke modification)
Stock 4V quench heads

So what's my CR?  They way I figured it, somewhere around 10:1 or 10½:1

I run 92 Octane, no problems.  But then again I'm running a roller  
cam, lifters, rockers, etc.  Higher stall converter (in the Mach I),  
etc.

So is 92 really too low for good performance at those CRs?

Asa Jay

Reviewing

Quoting JDeRyke at aol.com:

> As far as a street-driven engine on pump gas, IMHO you're pushing it with
> 10:1 and iron heads, or 10-1/2:1 and aluminum heads unless you set ignition
> advance on the dyno and then don't screw with it. Be very sure that   
> true TDC is
> found since most harmonic balancers have slipped their timing marks.
> I've been running 10.2:1 with SVO A-3 heads, an SVO hydraulic cam & Rhodes
> lifters, a tuner Holley 700 DP and 34 degrees total ignition   
> advance..... since
> 1992. I occasionally use 89-octane but if the car will be flogged or  
>  for going
> over mountains rapidly, I use 92 octane. This engine has never tasted race
> gas.   Good luck, Art- J DeRyke
>
>
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