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ED-EF compression difference 8:8:1 to 9:3:1 

 

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 Post subject: ED-EF compression difference 8:8:1 to 9:3:1
Posted: Sat Jul 24, 2010 3:51 pm 
Getting Side Ways
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ED-EF compression difference 8:8:1 to 9:3:1

ive noticed ed pistons have a deeper bowl than ef so is that what hightens the compression ???

im rebuilding an ef and ive aquired an ed head and the pistons that were supplyed to me were designed for an ed, the machinest


so basically by using the ed head and pistons im pretty much going to get 8:8:1* compression im guessing,, also bores are oversize 20thou, 0.50mm

can anyone confirm this as it may assist me in not having to shim the head to drop the compression because im turboing it

 

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 Post subject: Re: ED-EF compression difference 8:8:1 to 9:3:1
Posted: Sat Jul 24, 2010 5:32 pm 
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I thought AU were the first ones over the 9:1 CR..?????

 

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 Post subject: Re: ED-EF compression difference 8:8:1 to 9:3:1
Posted: Sat Jul 24, 2010 6:16 pm 
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ef and el were 9.3:1 and au are 9.6:1
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 Post subject: Re: ED-EF compression difference 8:8:1 to 9:3:1
Posted: Sat Jul 24, 2010 10:07 pm 
Getting Side Ways
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does anybody know what upgrades make the more kw in the ed-ef jump

 

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 Post subject: Re: ED-EF compression difference 8:8:1 to 9:3:1
Posted: Sat Jul 24, 2010 10:53 pm 
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compression, bbm and a better ecu map....
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 Post subject: Re: ED-EF compression difference 8:8:1 to 9:3:1
Posted: Tue Aug 03, 2010 1:05 am 
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i am also rebuilding a ef motor and also got ed pistons from the machinest
but i am not going turbo so i got the head faced and the block and am using a au gaskit
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 Post subject: Re: ED-EF compression difference 8:8:1 to 9:3:1
Posted: Tue Aug 03, 2010 3:01 am 
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So that's why the earlier motors like turbocharging so much, just under 9:1 comp? A mls gaskit would help to bring the comp back up if you want it back up, but it's easier to shave the head a bit to bump the compression.

The comp might be up a tad with the oversize....

Cheers

ToranaGuy

 

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 Post subject: Re: ED-EF compression difference 8:8:1 to 9:3:1
Posted: Tue Aug 03, 2010 7:19 am 
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Dont guess just cc the head and you will know for sure, Ring the suppler of the pistons and they will tell you what the cc dish is ,plus you work out your bore and deck hieght and contact suppler of gasket and they will tell cc of that as well .
CR=(D + PV + DC + G + CC) / (PV + DC + G + CC)

CR = Compression Ratio

D = Displacement

PV = Piston Volume

DC = Deck Clearance Volume

G = Gasket Volume

CC = Combustion Chamber Volume
It wont take long to work out and most of the volumes are in the suppler books so you wont even have to ring them . Guessing this sort of thing can become expensive
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