Motorgen - Automotive Events, Meets, Cruises and Forums - View Single Post - Importance of quench and overlap in a forced induction app.

94cobra69ss396 · 10-22-2014, 10:30 AM

I don't know enough about cams to answer that but yes it would mean that it is bleeding off less boost out the exhaust. I agree that too many things changed to pin point why the new engine doesn't ping like the old one but I did try to make sure I had the quench as tight as possible due to the pinging of the old combo.

Now on the opposite side, a bunch of the knowledgeable N2O guys say that with a BBC on N2O you want a bigger quench like around .080 because it works better with N2O. I actually don't have a clue what the Chevelle is at because I didn't check how far in the hole the piston is. I do run a .039 head gasket though.

10-22-2014, 10:30 AM	#9
94cobra69ss396 Fast & Filthy Join Date: Jun 2008 Posts: 3,840 Tweet	I don't know enough about cams to answer that but yes it would mean that it is bleeding off less boost out the exhaust. I agree that too many things changed to pin point why the new engine doesn't ping like the old one but I did try to make sure I had the quench as tight as possible due to the pinging of the old combo. Now on the opposite side, a bunch of the knowledgeable N2O guys say that with a BBC on N2O you want a bigger quench like around .080 because it works better with N2O. I actually don't have a clue what the Chevelle is at because I didn't check how far in the hole the piston is. I do run a .039 head gasket though.