Quote:
Originally Posted by Nick
David,
Is an improvement of the down draft angle one of the reasons that the heads for the LS series of chevy engines have less valve angle than the traditional SB chevy? (15 degrees vs. 23)
Does this also explain (at least partially) why the LS1 engine's cylinder head uses a larger port (in terms of volume) than most, (if not all) production SBC heads even though the displacement of the LS1 is only 346 c.i.?
|
Tricky question here.
Can't vouch for it but let me tell you what I heard. The tall LS1 thru 6 port was used because it generated a swirl /fuel spray interaction that cut emissions. The chamber was flatter so that there were less end gases trapped in a wedge and that the quench area, which can raise parts/million HC, is less. That,s all I can tell you. Bottom line is it seems to have little to do with output. Anyone else got any comments here???
DV