rough calc on piston dome volume

[Grumpy]

Well these questions are detailed to me. 454 bored .030. Stock stroke.

Heads are of the 049 variety and have cc'd dead on at 120. Checked every bowl just to be sure and they are all spot on 120.

Pistons are flat tops with 2 valve reliefs that sit .025 in the hole.

Cam is undecided but looking at something in this variety
Advertised Duration (Int/Exh): 268/276
Duration @ .050 (Int/Exh): 227/233
Gross Valve Lift (Int/Exh): .542/.554
LSA/ICL: 110/106

Weight of car 3500 lbs
TH400
Rear Gear currently 3.08 but looking to go to a 3.55 ish.

I know i need to get some dome on the pistons but am new to figuring just how much dome to get. I would like to limit this to just new pistons on stock rods and crank, but will clean up the heads in the bowls. The top half of the head has had work done because the tunnels have been cleaned up and the ports were gasket matched. Thanks for some guidance. Does the above info help any grumpy or is there more measurements i need to get? Thanks for your help and the plethora of info that i have been reading through.

Im not 100% sure what your asking here , I'm going to assume (usually a bad idea) that your asking what would be tthe ideal piston dome volume to use with those 120cc chamber heads?

we know the static value will be close to 9.5-10.25:1

using this link we find a cam on a 110 lSA with 227 intake duration valve timing very close to 40 degrees
if we add 15 to account for valve seating between .050 and fully seated we get 55 degrees
ok with the valve seated at 55 degrees we can calculate compression
http://garage.grumpysperformance.com/index.php?threads/crowers-valve-timing-charts.4299/

http://www.wallaceracing.com/dynamic-cr.php

https://www.uempistons.com/index.ph...e=comp&zenid=1e826335bfac0f356463eabed4958558

a bit of math says, a street driven car engine occasionally subjected to crappy gas octane , a piston dome in the 20 cc range would be about correct

ANYTIME YOU GET TOTALLY UNEXPECTED RESULTS,
IN A CALCULATION RETRY IT WITH SEVERAL DIFFERENT.
BUT SIMILAR FORMULAS OR CALCULATOR LINKS try this also
http://www.wallaceracing.com/dynamic-cr.php

http://www.pcengines.com.au/calculators/Calculate%20dynamic%20Comp%20Ratio.htm

http://cochise.uia.net/pkelley2/DynamicCR.html

http://www.steigerperformance.com/products/sp90005.html

https://www.uempistons.com/index.php?main_page=calculators&zenid=1e826335bfac0f356463eabed4958558

http://www.enginebasics.com/Advanced Engine Tuning/Static vs Dynamic.html

http://victorylibrary.com/mopar/cam-tech-c.htm


https://www.uempistons.com/index.ph...d=2675&zenid=1e826335bfac0f356463eabed4958558

http://garage.grumpysperformance.com/index.php?threads/sources-of-bbc-info.752/

http://garage.grumpysperformance.co...-on-the-cheap-well-to-start.11739/#post-55478

http://garage.grumpysperformance.com/index.php?threads/another-496bbc.5123/

http://garage.grumpysperformance.com/index.php?threads/468-build.11794/

http://garage.grumpysperformance.com/index.php?threads/big-block-chevy-info.710/#post-49739

http://garage.grumpysperformance.co...lsa-effects-your-compression-torque-dcr.1070/

http://garage.grumpysperformance.com/index.php?threads/is-backpressure-hurting-your-combo.495/

http://garage.grumpysperformance.com/index.php?threads/calculating-header-design.185/

INVESTING THE TIME AND EFFORT IN PURCHASING AND READING A FEW BOOKS WILL BE VERY COST EFFECTIVE

http://www.dragzine.com/tech-stories/en ... ine-block/
"

 

[Grumpy]

don,t forget when your selecting pistons that you can get custom thermal barrier coating's that can reduce the heat transfer and,
that can both reduce oil temps reduce the engines tendency toward detonation

http://garage.grumpysperformance.com/index.php?threads/thermal-coatings.2610/#post-12861

http://www.hotrod.com/how-to/engine/1406-narrowing-your-piston-choices/

http://garage.grumpysperformance.com/index.php?threads/piston-coating-deburring.4516/#post-16279