brians98ss

iTrader: (5)

After months of research and indecisions, I think I finally have my mind made up. But first of all, here are the goals that I had set for my car:

Primarily street driven with good street manners. Fun to drive around town.

The cam is a TR220 on a 114 LSA. The cam has been in the car for almost two years. The heads are to be AFR 205s milled to 64cc using Cometic gaskets with compressed thickness of .045". Static compression ratio should be around 10.5/10.6 to 1. And of course I'll have the supporting bolt-ons (LS6 intake, headers, etc.)

I went with this cam to pass CA smog (a bigger cam would have been nice ) and only a little bump in compression due to 91 octane. On top of all this, I plan to throw a 100 shot (dry) a little later down the road.

My only concerns are this:

1. I'm guessing my quench will be somewhere between .035 and .040. Will this be OK?

2. Will it be safe to spray with this set-up on 91 octane?

Please offer your opinions/suggestions.

Thanks,
Brian

lilbuddy1587

iTrader: (1)

Sounds great, but take more advantage of being able to bump the compression. 91 octane will support 11:1 comp. I live in AZ(shitty 91 as well) and there are people running 11.5:1. It's all in the tuning man. As long as you have the supporting mods for fuel(dry shot) , you'll be just fine

Flash99

iTrader: (48)

Maybe even bump up to a 224/230 114lsa with a good tune.

orangeapeel

iTrader: (18)

You will want a good tune regardless.

slow trap

iTrader: (22)

with a good tune 10:5 to 1 even on 91 should be a walk in the park.

orangeapeel

iTrader: (18)

Most definitely.

I think for smog you can get all the way up near 230 on the duration. A TR224 would be a good choice too if you could get a 114 cut.

Also:

If you are going to spray a H/C, also remember that you are gonna want to get some good injectors so you don't end up with a nice cup of LS1 Soup.

SideStep

10.5 How far are your pistons out of the hole??? Even if the pistons were perfectly flush with the deck (and they are not) I get 10.73ish for the static. If you were only .006 out of the hole I get 10.88 for the static...

Your DCR will be what determines if you can run on 91 Octane. What is the advance (ICL) of that cam?

+2 advance (112ICL) DCR is 8.54....Border-Line on that gas ( you will have to pull some timing)
+4 advance (110ICL) DCR is 8.68....No go on that gas

AGAIN, I got these number using .006 piston height, which seems the be average. Mine were .007-.008

brians98ss

iTrader: (5)

SideStep,

You're right. I re-checked the numbers and with that gasket thickness my compression would be hovering around 10.8. Probably should go with a thicker gasket like a GM 6.0L (.055" ?)

With regards to the ICL, yes it is a +4 advance. How did you calculate DCR? Looks like I'll need to know this since this appears to be my limiting factor.

Brian

SideStep

How about this; Keep the .045 head gasket and go with the 66cc AFRs (no mill). That should give you a static of 10.62 (who cares...) with a DCR of 8.47 AND a better quench because of the thinner head gaskets...

I will find the link to the spreadsheet I am using....