Not much sense in trying to talk to other people if you're going to use your own definitions for standard terms. As you can see from the results in this thread...

 

My definition of DCR is a standard definition. It's just not the standard discussed here, there is another forum I read where DCR has a totally different meaning. And where the posters carry far more weight in terms of knowledge of the science and art of engine building than here. As for water injection on a N/A engine yes it does work Rich give me a few hours and I'll dig something up for you.

 

SO Umm Ill say with my le3.2 cam and right about 11.5:1 Ill be alright?

 

wow, that thing is on a 107 LSA?

 

yep

 

Yes it will be fine. I have the same cam with 11.76 : 1 with a quench of .036

By the way, you should delete those cam specs out of your post. You know Bret doesn't like them to be posted for everyone to see. IMO You should respect his wishes like everyone else who has one of his cams

 

Nice, just as long as it fit your build. dont be scared of the narrow LSA.

 

Without having the cam in front of you to measure (assuming you know how to do it) or the lobe numbers, those numbers alone don't mean a whole lot.

 

If your definition of "DCR" is what I call "cylinder pressure", what is it a "ratio" between? I suppose you could see it as a "pressure ratio" (cylinder pressure/atmospheric). But how do you measure or calculate it? IF you knew your VE and a bunch of other data, you could estimate it, I guess. But who here knows their VE at varying rpm? Air density? Etc. What is an acceptable/desireable ratio? And so on.

Anyway, I'd appreciate any info you have on water injection for an NA setup.

Rich

 

Did you get it dynoed?

 

I agree, even so I'm just sayin he should still respect Bret's wishes. It's well known that Bret, LE, or AI don't like their specs revealed in any way shape or form.

 

Not yet sir, I've been concentrating on buying a new house and my camaro is still on the back burner because of that Hopefully I'll get it done late this spring.

I understand your concern because I did the same when I was building my motor. But I assure you that I always did lots of research before buying parts or making decisions on how it got built, and 11.5:1 will be fine. Any lower, and you'd be giving up alot of midrange. I was originally gonna run my combo at 11.5 too, but I wanted to bring the quench area down closer to .035 from .039, which resulted in 11.76:1. Even with the higher SCR, it will resist detonation better with the tighter quench area. Thats why I did it.

Check out this thread, this is what made me decide to go the route that I did...

http://web.camaross.com/forums/showt...hlight=cometic

 

Do you happen to recall the part number for the Cometics you used?

 

VE can be determined averaged and derived from the MAF data (and a bunch of extra data most of which is available with the stock sensors).

I unfortunately cannot find the post I was looking on the forum I thought it was on for with regards to water injection on a NA setup. If I come across it anytime in the near future I will be sure to pm it to you.

 

I ended up not using cometics...but the part # that I was going to use was C5645-036. Those are 4.04 bore, .036 thick. Those work if you have stock castings with 2.00/1.57s, but if you have large valve heads you would need the 4.100 bore gaskets which are C5646-036

The reasons that I didn't use them is because later I measured and found that my pistons were all .005-.006 in the hole, and also that the finish on the deck surface of my block was not smooth enough for cometics to seal properly. So I went with GM Impala SS gaskets which gave me the same CR with a .034 quech.