SPANKY LS1

iTrader: (24)

Went to several sponsors websites, and noticed that virtually none of them mention porting or modifying the combustion chamber, only the intake and exhaust ports, anyone know this? There must not be anything to gain from modifying the CC, correct?

XtraCajunSS

iTrader: (2)

Normally the head porter will modify the combustion chamber based on intended use. For example a large bore motor will benefit from opening up the chamber by unshrouding the valves. Also, most porters will smooth the surface and knock off any sharp edges to help avoid detonation...

Shane

SPANKY LS1

iTrader: (24)

So, on a stock bore motor, there isn't much to gain by modifying this? That really says alot about the quality and engineering that went into the LS1 heads....thank you, GM. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

dand35th

I just got my 5.3's back from TEA and the combustion chamber IS cnc'd..

ls1290

iTrader: (20)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by dand35th:
<strong>I just got my 5.3's back from TEA and the combustion chamber IS cnc'd..</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Do you have TEA contact info? I am looking to have a set of heads ported.

dand35th

total engine airflow sponsor to the left>>>>

Sears

Unless you are sitting inside the monitor, >>>> is to the right. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

Justin

JPR

Funny Justin! Anyway, there is flow to be found in the combustion chamber, but it is usually specific to the porting of the intake and exhaust runner and casting number and works especially well on our S1's. (small runner) On the other hand, the S2's combustion chambers are treated to a valve de-shrouding treatment/rolling over sharp edges etc. We have found that the combustion chamber geometry does not have to be completly rectified to the point that it is unrecognizable so I do agree, GM did a great job designing them.
Joe.

Richard@WCCH

iTrader: (3)

LS1 and LS6 chambers are indeed a very well engineered shape. They strike a balance of squish band and ideal spark plug location for an efficient wedge design. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> No real big contour changes are necessary unless chamber volumes are an issue. GM has done a masterful job offering several different volumes to facilitate compression adjustments. The chamber designs among the different castings will usually make for some differences in net air flow but maintain similar flame travel.
A CNC machined finished chamber will produce very even chamber volumes and due to the identical shapes, generate consistent flame fronts all else being equal. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Richard

VINCE

iTrader: (1)

Very interesting subject..

SPANKY LS1

iTrader: (24)

My question is this, why is the 5.3 chamber modified, while the 5.7 chamber is nt, is the 5.7 chamber somehow better than the 5.3 chamber?

LS1derfull

5.3 chamber is smaller,so it stands to be improved by opening up around valves, where 5.7 is cast with this area relieved. Airflow is usually worth more than compression for making power, so you be the judge.