Laying over

Adger Smith · 08-01-2011, 11:27 PM

Rob,
That is good info from your engine guy. I was headed that way. He has increased the cyl pressure. You might need to close up the plug gap a little if you are running it pretty wide. I have found that big cu in engines with 18 deg heads don't like a lot of timing. The plug is located in the chamber high and close to centered. It doesn't need a lot of timing to get the flame front over the dome and get pressure rise. I would also use a non extended tip plug with alky and that head. The wet alky /air mixture hitting the hot exposed extended tip could ignite before the spark.
Good luck with the tune up.

08-01-2011, 11:27 PM	#9
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: Laying over Rob, That is good info from your engine guy. I was headed that way. He has increased the cyl pressure. You might need to close up the plug gap a little if you are running it pretty wide. I have found that big cu in engines with 18 deg heads don't like a lot of timing. The plug is located in the chamber high and close to centered. It doesn't need a lot of timing to get the flame front over the dome and get pressure rise. I would also use a non extended tip plug with alky and that head. The wet alky /air mixture hitting the hot exposed extended tip could ignite before the spark. Good luck with the tune up. __________________ Adger Smith (Former SS) Last edited by Adger Smith; 08-01-2011 at 11:28 PM. Reason: sp