diff --git a/Aircraft/c172p/Engines/eng_io320.xml b/Aircraft/c172p/Engines/eng_io320.xml
index 22c1be211..b7cc52706 100644
--- a/Aircraft/c172p/Engines/eng_io320.xml
+++ b/Aircraft/c172p/Engines/eng_io320.xml
@@ -12,13 +12,13 @@
 -->
 
 <piston_engine name="IO320">
-  <minmp unit="INHG">         6.5  </minmp>	<!-- Deprecated -->
+  <minmp unit="INHG">         8.3  </minmp>	<!-- Deprecated -->
   <maxmp unit="INHG">        28.5  </maxmp>	
   <displacement unit="IN3"> 320.0  </displacement>
   <maxhp>                   160.0  </maxhp>	
   <!-- bsfc>                      0.37 </bsfc -->
   <cycles>                    4.0  </cycles>
-  <idlerpm>                 550.0  </idlerpm>
+  <idlerpm>                 600.0  </idlerpm>
   <maxrpm>                 2700.0  </maxrpm>
   <maxthrottle>               1.0  </maxthrottle>
   <minthrottle>               0.1  </minthrottle>