Carb / inlet reserve
0%Unused modelled flow capacity at peak power; not a prediction of available power gain.
ACTIVE MINI
Classic Mini 1275 · Standard
1275 cc · Single HIF38 · 1.50 in · naturally aspirated
Checking device save…
V2 · WORKSHOP
Build. Compare. Validate.
Your original app is unchanged. This separate version uses the same engine model.
BUILD COMPARISON
Classic Mini 1275 · Standard
Choose a saved build opens a tune JSON file from your device for comparison. It replaces the loaded build; your baseline stays unchanged.
Baseline: Factory baseline · Classic Mini 1275 · Standard. Capture a baseline before editing; it stays fixed while you tune.
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) | 13.3 | 13.3 | +0.0 |
| Quarter mile (s) | 19.3 | 19.3 | +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
What is holding this build back?
The model realises 41% of cam airflow potential. Compare the carburettor / inlet package before increasing cam duration.
Head reserve
0%Evaluate the whole valve, port and cam package before spending on a larger casting.
- Selected redline is mechanically permissible but above the calculated 5,700 rpm useful maximum for a 5,250 rpm power peak.
Next step: capture this build, change one component in Setup, then compare the full torque curve and road estimates here.
INTENDED USE · HEURISTIC
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.
Screening rule: longest advertised duration below 260° = road; 260–279° = fast road; 280°+ = competition-biased. Checking conventions differ. This is not a manufacturer suitability rating or an idle simulation.
ASSEMBLY CHECKS
Compatibility is more than airflow
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
What supports these results?
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; V2 does not claim a new manufacturer verification.
MY GARAGE · THIS DEVICE
Keep your builds together
Separate from V1. Browser storage is device-local and can be cleared; export important builds as backups. Use “Load saved file” above to bring a V1 tune into V2.
No saved builds yet. Name the loaded build and save your first snapshot.
DYNO VALIDATION
Compare a measured curve
Import a two-column CSV with header rpm,bhp. Choose flywheel or wheel basis above to match your file. Use comparable atmospheric corrections and test conditions. No correction factor is applied.