Whats Next? - ZR-1 Net Registry Forums

XfireZ51 · 08-08-2015

We should probably let Lee have his thread back. Maybe start a new one. Paul is correctly characterizing my discussion. It really goes back to breathing more lift/duration or more valves. I feel that a OHV motor is optimized for a particular region of the rpm band whereas an OHC 4 valve has great breathing ability without as much of a sacrifice to reasonable part throttle and idling characteristics. When it comes to all out performance, it's clear GM has decided on the in block cam config and for a lot of very good reasons like packaging, weight, center of gravity, simplicity, hood line, etc, etc. and w the engine management capability of today's processors, the LS/LT motors can really be made to perform and behave all at the same time.
Commenting on the cylinder head, my point was really about how capable the LT-5 heads are given they were designed for a 5.7ish L motor and yet can be found supporting motors of nearly 26% more displacement. In addition, it's all we've got, there ain't no more. no AFR, no TrickFlow, no Brodix, no nuthin'.
Not to mention crank and cams. It's all on us here. Nobody out there helping us out. Just like Lee here doing it pretty much on his own, his own time, his own money. That's why I admire the LT-5.

08-08-2015	#24
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,683	Re: Whats Next? We should probably let Lee have his thread back. Maybe start a new one. Paul is correctly characterizing my discussion. It really goes back to breathing more lift/duration or more valves. I feel that a OHV motor is optimized for a particular region of the rpm band whereas an OHC 4 valve has great breathing ability without as much of a sacrifice to reasonable part throttle and idling characteristics. When it comes to all out performance, it's clear GM has decided on the in block cam config and for a lot of very good reasons like packaging, weight, center of gravity, simplicity, hood line, etc, etc. and w the engine management capability of today's processors, the LS/LT motors can really be made to perform and behave all at the same time. Commenting on the cylinder head, my point was really about how capable the LT-5 heads are given they were designed for a 5.7ish L motor and yet can be found supporting motors of nearly 26% more displacement. In addition, it's all we've got, there ain't no more. no AFR, no TrickFlow, no Brodix, no nuthin'. Not to mention crank and cams. It's all on us here. Nobody out there helping us out. Just like Lee here doing it pretty much on his own, his own time, his own money. That's why I admire the LT-5.