Keys The Ruin - Pyramid Cave

Balkan Bo

“Modern engines with fewer than 40 moving parts!?”

Full cradle 6-bolt mains + oversize bearings → holds high BMEP and sustained boost without cap walk or oil-film collapse.

Square with balance pairs → keeps mean piston speed reasonable at 6,500–7,200 rpm so we can rev a bit to compensate for breathing limits.

Studded copper gaskets + air-cooled heads → tolerate LPG heat loads and high static CR.

Realistic power (conservative)

Assume modernized flathead ports, tight quench, LPG-friendly 11.0–11.8:1 static CR, good ignition control, and a mild roots/TVS unit the buyer can install.

Engine	Displ.	State	Boost	HP/L (safe)	Ballpark HP
I4 flathead	2.0 L	NA	0 psi	45–60	90–120 hp [Sciurus]
I4 flathead	2.0 L	SC	6–8 psi	90–115	180–230 hp [Super Squirrel]
I4 flathead	2.0 L	SC	10–12 psi	115–140	230–280 hp [Québec Squirrel]

V6 flathead	4.0 L	NA	0 psi	45–60	180–240 hp [Sciurus]
V6 flathead	4.0 L	SC	6–8 psi	90–110	360–440 hp [Super Squirrel]
V6 flathead	4.0 L	SC	10–12 psi	110–130	440–520 hp [Québec Squirrel]

If there is need for MORE POWER, we have the "Michaud Squirrel" engine:
Using HARDOX steel head is lets you lean hard on LPG + boost without the usual head-death. Hit ~320–360 hp (2.0 L) or ~600–700 hp (4.0 L) at 15 psi with good manners; push to ~500/1,000 hp at 25 psi if you follow the Heat Rules and keep the block honest. {This tuning is not intended for average people. The rest of you send photos!}

Notes
• These are streetable numbers with margin for heat and fuel quality variation.
• Chasing “dyno hero” pulls is possible, but cooling and detonation control become the limiters before the bottom end does.

Why this is believable (flathead physics, modern fixes)

Airflow ceiling: valve curtain area and shrouding are the classic limiters. We claw back with bigger valves, higher lift (roller cam), fast ramps, deshrouding, and short-side radius work.

LPG/Renewable LPG advantage: high octane & clean burn → higher static CR and more timing without knock, plus less oil dilution at boost.

Boost as equalizer: a modest TVS at 6–8 psi effectively “replaces” what a crossflow head would have given you NA.

Rev headroom: 6 bolt cradle + bearings keep mean piston speed ~18–19 m/s @ 6,500 rpm (86 mm stroke example)—well within durable street limits.

MichauMoto 1487

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