diff --git a/firmware/controllers/algo/advance_map.cpp b/firmware/controllers/algo/advance_map.cpp
index ae8fb11ce0..f10c75fbc3 100644
--- a/firmware/controllers/algo/advance_map.cpp
+++ b/firmware/controllers/algo/advance_map.cpp
@@ -214,44 +214,4 @@ size_t getMultiSparkCount(int rpm) {
 	}
 }
 
-/**
- * @param octane gas octane number
- * @param bore in mm
- */
-float getTopAdvanceForBore(chamber_style_e style, int octane, double compression, double bore) {
-    int octaneCorrection;
-    if ( octane <= 90) {
-        octaneCorrection = -2;
-    } else if (octane < 94) {
-        octaneCorrection = -1;
-    } else {
-        octaneCorrection = 0;
-    }
-
-    int compressionCorrection;
-    if (compression <= 9) {
-        compressionCorrection = 2;
-    } else if (compression <= 10) {
-        compressionCorrection = 1;
-    } else if (compression <= 11) {
-        compressionCorrection = 0;
-    } else {
-        // compression ratio above 11
-        compressionCorrection = -2;
-    }
-    int base;
-    if (style == CS_OPEN) {
-    	base = 33;
-    } else if (style == CS_CLOSED) {
-    	base = 28;
-    } else {
-    	// CS_SWIRL_TUMBLE
-    	base = 22;
-    }
-
-    float boreCorrection = (bore - 4 * 25.4) / 25.4 * 6;
-    float result = base + octaneCorrection + compressionCorrection + boreCorrection;
-    return ((int)(result * 10)) / 10.0;
-}
-
 #endif // EFI_ENGINE_CONTROL
diff --git a/firmware/controllers/algo/rusefi_enums.h b/firmware/controllers/algo/rusefi_enums.h
index 6b39769330..0d0697aa78 100644
--- a/firmware/controllers/algo/rusefi_enums.h
+++ b/firmware/controllers/algo/rusefi_enums.h
@@ -506,13 +506,6 @@ typedef enum {
 	Internal_ForceMyEnumIntSize_timing_mode = ENUM_32_BITS,
 } timing_mode_e;
 
-typedef enum {
-    CS_OPEN = 0,
-    CS_CLOSED = 1,
-    CS_SWIRL_TUMBLE = 2,
-
-	Internal_ForceMyEnumIntSize_chamber_stype = ENUM_32_BITS,
-} chamber_style_e;
 
 /**
  * Net Body Computer types
diff --git a/unit_tests/tests/test_engine_math.cpp b/unit_tests/tests/test_engine_math.cpp
index 21cbb739bc..d5d9a9cefb 100644
--- a/unit_tests/tests/test_engine_math.cpp
+++ b/unit_tests/tests/test_engine_math.cpp
@@ -64,6 +64,55 @@ TEST(misc, testEngineMath) {
 	ASSERT_NEAR(56.9762f/*kg/h*/, engine->engineState.airflowEstimate, EPS4D);
 }
 
+typedef enum {
+    CS_OPEN = 0,
+    CS_CLOSED = 1,
+    CS_SWIRL_TUMBLE = 2,
+
+	Internal_ForceMyEnumIntSize_chamber_stype = ENUM_32_BITS,
+} chamber_style_e;
+
+/**
+ * @param octane gas octane number
+ * @param bore in mm
+ */
+static float getTopAdvanceForBore(chamber_style_e style, int octane, double compression, double bore) {
+    int octaneCorrection;
+    if ( octane <= 90) {
+        octaneCorrection = -2;
+    } else if (octane < 94) {
+        octaneCorrection = -1;
+    } else {
+        octaneCorrection = 0;
+    }
+
+    int compressionCorrection;
+    if (compression <= 9) {
+        compressionCorrection = 2;
+    } else if (compression <= 10) {
+        compressionCorrection = 1;
+    } else if (compression <= 11) {
+        compressionCorrection = 0;
+    } else {
+        // compression ratio above 11
+        compressionCorrection = -2;
+    }
+    int base;
+    if (style == CS_OPEN) {
+    	base = 33;
+    } else if (style == CS_CLOSED) {
+    	base = 28;
+    } else {
+    	// CS_SWIRL_TUMBLE
+    	base = 22;
+    }
+
+    float boreCorrection = (bore - 4 * 25.4) / 25.4 * 6;
+    float result = base + octaneCorrection + compressionCorrection + boreCorrection;
+    return ((int)(result * 10)) / 10.0;
+}
+
+
 TEST(misc, testIgnitionMapGenerator) {
 	printf("*************************************************** testIgnitionMapGenerator\r\n");