Interesting effect of valve coking - ZR-1 Net Registry Forums

XfireZ51 · 07-30-2015

This was displayed in a thread on the C7 forum discussing issues w Direct Injection and effect of not having fuel sprayed on valves.
The dyno chart demonstrates the gradual loss of power over time. I suspect something like this may also happen if you're not using ur secondaries very often especially since oil fumes are quite present in the LT-5 air intake.
The third and fourth run show difference in same motor after de-coking of valves. Fairly dramatic.

07-30-2015	#1
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,683	Interesting effect of valve coking This was displayed in a thread on the C7 forum discussing issues w Direct Injection and effect of not having fuel sprayed on valves. The dyno chart demonstrates the gradual loss of power over time. I suspect something like this may also happen if you're not using ur secondaries very often especially since oil fumes are quite present in the LT-5 air intake. The third and fourth run show difference in same motor after de-coking of valves. Fairly dramatic. Last edited by XfireZ51; 07-30-2015 at 09:58 AM.