Number 1 cylinder

[mph5790]

I overhauled my engine this summer and added a JPI engine analyzer.  The #1 was always running the hottest sometimes going over 400 running ROP which concerned me.  Upon questioning my A&P and switching probes etc.  we determined the probes were reading correctly.  We then took a baffle off the front of the #1 and it became the coolest running cylinder.  Now I have been running LOP and it continues to run the coolest but now it is so cool at 280 degrees I wonder if that is good.  If I switch to ROP it runs about 320 with the other cylinders in the mid 300's.  Should I put the baffle back on and not worry about high temps on that cylinder?

[FAST FLIGHT OPTIONS LLC]

Quote: mph5790

I overhauled my engine this summer and added a JPI engine analyzer.  The #1 was always running the hottest sometimes going over 400 running ROP which concerned me.  Upon questioning my A&P and switching probes etc.  we determined the probes were reading correctly.  We then took a baffle off the front of the #1 and it became the coolest running cylinder.  Now I have been running LOP and it continues to run the coolest but now it is so cool at 280 degrees I wonder if that is good.  If I switch to ROP it runs about 320 with the other cylinders in the mid 300's.  Should I put the baffle back on and not worry about high temps on that cylinder?

[Cruiser]

measure the height of the removed baffle and have your A&P make a replacement about 3/8" shorter than the original. That should bring your ROP temps down some and increase the LOP numbers.  You may have to adjust the height a little more or less to hit the temperature you are happy with.