diff --git a/Engines/cfm56_5b4.xml b/Engines/cfm56_5b4.xml
index 30468479..31d672fa 100644
--- a/Engines/cfm56_5b4.xml
+++ b/Engines/cfm56_5b4.xml
@@ -14,8 +14,8 @@
 	<bleed>          0.03 </bleed>
 	<idlen1>         19.7 </idlen1>
 	<idlen2>         61.2 </idlen2>
-	<n1spinup>        0.2 </n1spinup>
-	<n2spinup>        2.0 </n2spinup>
+	<n1spinup>        0.1 </n1spinup>
+	<n2spinup>        1.0 </n2spinup>
 	<maxn1>         103.8 </maxn1>
 	<maxn2>         101.4 </maxn2>
 	<augmented>         0 </augmented>
diff --git a/Engines/leap1a26.xml b/Engines/leap1a26.xml
index 56468742..2ff235b1 100644
--- a/Engines/leap1a26.xml
+++ b/Engines/leap1a26.xml
@@ -14,8 +14,8 @@
 	<bleed>          0.03 </bleed>
 	<idlen1>         19.7 </idlen1>
 	<idlen2>         61.2 </idlen2>
-	<n1spinup>        0.2 </n1spinup>
-	<n2spinup>        2.0 </n2spinup>
+	<n1spinup>        0.1 </n1spinup>
+	<n2spinup>        1.0 </n2spinup>
 	<maxn1>         103.8 </maxn1>
 	<maxn2>         101.4 </maxn2>
 	<augmented>         0 </augmented>
diff --git a/Engines/pw1127g.xml b/Engines/pw1127g.xml
index 40c5fe2c..4e7e9c01 100644
--- a/Engines/pw1127g.xml
+++ b/Engines/pw1127g.xml
@@ -14,8 +14,8 @@
 	<bleed>          0.03 </bleed>
 	<idlen1>         19.7 </idlen1>
 	<idlen2>         61.2 </idlen2>
-	<n1spinup>        0.2 </n1spinup>
-	<n2spinup>        2.0 </n2spinup>
+	<n1spinup>        0.1 </n1spinup>
+	<n2spinup>        1.0 </n2spinup>
 	<maxn1>         103.8 </maxn1>
 	<maxn2>         101.4 </maxn2>
 	<augmented>         0 </augmented>
diff --git a/Engines/v2527_a5.xml b/Engines/v2527_a5.xml
index a1354dac..544ea67b 100644
--- a/Engines/v2527_a5.xml
+++ b/Engines/v2527_a5.xml
@@ -14,8 +14,8 @@
 	<bleed>          0.03 </bleed>
 	<idlen1>         22.4 </idlen1>
 	<idlen2>         60.9 </idlen2>
-	<n1spinup>        0.2 </n1spinup>
-	<n2spinup>        2.0 </n2spinup>
+	<n1spinup>        0.1 </n1spinup>
+	<n2spinup>        1.0 </n2spinup>
 	<maxn1>         103.8 </maxn1>
 	<maxn2>         101.4 </maxn2>
 	<augmented>         0 </augmented>