Restrictive M10 build for stock car racing.

DC2.jpgHi guys,

I race a 325 chassis with an M10 engine, on a short track asphalt oval. The rules require a spec carb on a stock intake, so there's a limit to what you can get out of an engine. My current engine is as follows, as explained by the guy who built it;

318 block with 2.0 litre crank and rods. The pistons are custom forged ROSS Racing pistons from Ireland Engineering. the cam isn't very big...slightly larger than a stock Ti grind, valve springs are new hi perf with titanium valve keepers and aluminum valve spring hats. The head is the stock 1.8 litre head which flows real good. there should be a crank scraper in the pan also. Intake is from a Ti
Compression ratio should be 10-1
The class rules are here;

CARBURETED ENGINES
A. Four cylinder engines.
B. Must be same manufacturer as the body, i.e. Toyota-to-Toyota, Honda to Honda.
C. Maximum displacement 2300 cubic centimeters.
D. DOHC allowed (see weight section).
E. Maximum .040 inch overbore.
F. Balancing of engines and lightening of flywheel is allowed.
G. Power to electric pumps must be interrupted when the ignition is turned off. A Hobbs type switch is required.
H. Any reground camshaft allowed.
I. 11.0 to 1 max. compression ratio.
J. No stroking, de-stroking or de-tuning of engines allowed.
K. No mixing of 2.3 and 2.5 Ford engine parts.
HEADS, CARBURETOR AND INTAKE MANIFOLD
A. Cylinder head may be surface machined any amount. No porting, polishing or altering allowed.
B. Stock single carburetor.
C. Optional carburetors in place of O.E.M. are the Holley 5200 or equivalent and the Holley 350cfm.
D. A 1-¼ inch spacer/adapter maximum . Bolt on assembly only.
E. Stock O.E.M. single plane manifold. No fuel injection air plenum manifolds. No grinding of intake manifold allowed.
F. No turbo chargers. No superchargers.
G. Air filter with metal lid is mandatory. H. Pump gas only.

I have a second engine, partially built, then stopped, then I bought the car, and the spec and state of the build is unknown. Over the winter I want to complete the spare engine, and do what I can to get the most power out of it, within the rules of course.

So I am left wondering, what can I do with pump gas and max 11:1 CR, a spec downdraft carb and stock head/manifold?

Any input and suggestions are appreciated.

Rob

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• DC2.jpg (197.9 KB)

Restrictive M10 build for stock car racing.