Sparl Plug Gap

[Tony Castronovo]

Yesterday I told you guys that we found the best gap settings for our XForce engine to be between 0.030 - 0.032 and we actually picked up 2 MPH at 0.032 gap. Keep in mind that this is on an M6 race engine and I should of been more specific. In actuality by increasing the gap to the 0.032" in our case we did get more top end performance, but with that said I don't recommend this on clutched engines used for sport/performance use, as the engine RPMs will need to be set higher to sustain, and it can be a little tougher to start the engine.

Today we tested a XForce M5 with a clutch and we found that the engine was easiest to start and run when set at 0.028 to 0.030. It idled well and was easy to start.