Carb / inlet reserve
0%Flow headroom at peak power, not available power gain.
ACTIVE MINI
Classic Mini 1275 · Standard
1275 cc · Single HIF38 · 1.50 in · naturally aspirated
Checking device save…
Workshop V3
Build comparison
Baseline: Classic Mini 1275 · Standard. Fixed while you edit.
Setup differences
| Setting | Baseline | Loaded build |
|---|
| Flywheel / road metric | Baseline | Loaded build | Change |
|---|---|---|---|
| Peak power (bhp) | 59.0 | 59.0 | +0.0 |
| Power peak (rpm) | 5250.0 | 5250.0 | +0.0 |
| Peak torque (lb ft) | 69.0 | 69.0 | +0.0 |
| Torque peak (rpm) | 3500.0 | 3500.0 | +0.0 |
| 0–60 mph (s) | 13.0 | 13.0 | +0.0 |
| Quarter mile (s) | 19.2 | 19.2 | +0.0 |
| Maximum speed (mph) | 90.7 | 90.7 | +0.0 |
━━ Loaded build┄┄ Baseline
Curves stop at each build’s selected redline. The chart is not permission to exceed its mechanical limit.
Power and torque changes across the rev range
| RPM | Δ bhp | Δ lb ft |
|---|---|---|
| 2000 | +0.0 | +0.0 |
| 3000 | +0.0 | +0.0 |
| 4000 | +0.0 | +0.0 |
| 5000 | +0.0 | +0.0 |
| 6000 | +0.0 | +0.0 |
LIMITATIONS & NEXT STEPS
Limits & next steps
The model realises 41% of cam airflow potential. Compare the carburettor / inlet package before increasing cam duration.
Head reserve
0%Check valves, ports and cam together.
- Selected redline is mechanically permissible but above the calculated 5,700 rpm useful maximum for a 5,250 rpm power peak.
Capture a baseline, change one part, then compare.
Intended use · Road-biased
Shorter duration generally favours idle quality and low-speed flexibility. This is not a guarantee for the assembled engine.
Selected cam: BMC · AEA630 / 12G165 · 998 Cooper / 1098. Predicted useful maximum: 5,700 rpm.
Duration guide: below 260° road; 260–279° fast road; 280°+ competition. Conventions differ; not a manufacturer rating or idle simulation.
Assembly checks · 6 items
Selected redline
6,500 rpm selected; 6,500 rpm estimated mechanical limit. This estimate does not certify the parts.
Valve-to-bore / head clearance
Check valve position against the actual bore, gasket and block deck. Casting name alone cannot establish clearance.
Valve-to-piston clearance
Check through the overlap region with the actual cam timing, piston crown and head skim; 7.92 mm nominal maximum valve lift is not a clearance calculation.
Spring coil bind / retainer clearance
Measure installed height, spring travel to coil bind, seat/open pressure and retainer-to-guide clearance. Spring category alone cannot prove suitability.
Rocker geometry
At 1.30:1 nominal ratio, verify contact sweep, pushrod clearance and actual valve lift.
Carburettor / manifold fit
Confirm flange pattern, throat alignment, linkage travel, bonnet clearance and fuel connections. Airflow compatibility is not a physical fit check.
Data & assumptions
Factory baseline
Standard power and torque are anchored to the existing app’s factory specification data. Modified curves use modelled changes relative to that baseline; they are not independent dyno measurements.
BMC · AEA630 / 12G165 · 998 Cooper / 1098
Timing 5/45 · 51/21; duration 230° / 252°; nominal valve lift 7.92 mm.
Cam source notes and conflicting values
998 Cooper and 1098 A-series
12G940 · standard 1275
Head-flow and porting factors are model inputs, not a flowbench certificate for your casting. Carb flow is an installed-system estimate, not a rated catalogue CFM.
Mechanical limits & road results
Spring/rotating limits use component categories. Drag, losses, traction and shift times are assumptions. Source descriptions are retained from V1; No new manufacturer verification is claimed.