Combustion Ratio Calculator??

[nito88stang]

Can someone point me towards a combustion ratio calculator or tell me what exactly my ratio will be with my new combo?

I have SpeedPro pistons that give 9:1 CR with 58 CC heads. I have however the TrickFlow TW heads with 61CC's. So i know i am below 9:1 and probably around 8:7 or 8:8 but wanna know exactly (this is gonna have a blower bolted on later)

thx alot

 

[giddyup306]

Somewhere around 8.8:1. Don't know the formula off the top of my head but I'll try and dig it up.

 

[giddyup306]

one cylinder swept volume + deck cc + head cc

deck cc + head cc

Example: 545 + 3.378 + 48 = 596.378

3.378 + 48 = 51.378 = 11.6:1

 

[jrichker]

See http://users.erols.com/srweiss/ for all kinds of automotive calculators.

 

[tjm73]

one cylinder swept volume + deck cc + head cc

deck cc + head cc

Example: 545 + 3.378 + 48 = 596.378

3.378 + 48 = 51.378 = 11.6:1

HUH!?!?! This makes no sense to me by its self or in relation to the post prior to it.

 

[tjm73]

This is a good one too.

http://www.prestage.com/community/C...tors/Calculate+Compression+Ratio/default.aspx

1 cc in head volume is worth about .12 in compression on a 302.

 

[giddyup306]

HUH!?!?! This makes no sense to me by its self or in relation to the post prior to it.

It's the formula to calculate compression ratio.

 

[tomst9]

Whats the deck hieght or cc of a stock 5.0l motor?

 

[nito88stang]

Thx for all the info guys, but i dunno wtf to plug into the formula. Although if what tjm73 said is true, then i'll be at 8.76:1 CR.