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| misk_one |
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hey guys
im going to take some meat out of my EB head so the comp is a turbo friendly 9:1 ill be using an EF bottom end and the EB head has been shaved a fair bit, hence why it needs some meat taken out. just wondering if someone can confirm if this info is correct for an EF/EL engine. bore = 3.6320 stroke = 3.9100 gasket bore = 3.6868 compressed head gasket thickness = .040 combustion chamber = 62cc piston bowl = 8.5cc deck clearence = 0.0300 using that info on this site (http://www.csgnetwork.com/compcalc.html) it gives me a 9.13:1 comp ratio. is this correct? the EB head has around 50cc chamber volume at the moment and i will be using an AU gasket. so the numbers i'm working with are more like this: bore = 3.6320 stroke = 3.9100 gasket bore = 3.6868 compressed head gasket thickness = .020 combustion chamber = 68cc piston bowl = 8.5cc deck clearence = 0.0300 this gives me 8.9:1 comp with 18cc taken out of the chambers which is perfect, but i just need to make sure im working with the correct numbers in terms of piston bowl, deck etc any feedback would be good 
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| hans hartman |
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misk_one wrote: hey guys have to cc it all,can use a decompression plate after you reshape the head,have you seen 18 cc in the head removed.
im going to take some meat out of my EB head so the comp is a turbo friendly 9:1 ill be using an EF bottom end and the EB head has been shaved a fair bit, hence why it needs some meat taken out. just wondering if someone can confirm if this info is correct for an EF/EL engine. bore = 3.6320 stroke = 3.9100 gasket bore = 3.6868 compressed head gasket thickness = .040 combustion chamber = 62cc piston bowl = 8.5cc deck clearence = 0.0300 using that info on this site (http://www.csgnetwork.com/compcalc.html) it gives me a 9.13:1 comp ratio. is this correct? the EB head has around 50cc chamber volume at the moment and i will be using an AU gasket. so the numbers i'm working with are more like this: bore = 3.6320 stroke = 3.9100 gasket bore = 3.6868 compressed head gasket thickness = .020 combustion chamber = 68cc piston bowl = 8.5cc deck clearence = 0.0300 this gives me 8.9:1 comp with 18cc taken out of the chambers which is perfect, but i just need to make sure im working with the correct numbers in terms of piston bowl, deck etc any feedback would be good
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| misk_one |
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i know i need to cc it all, but i cant exactly CC the pistons without pulling them out.
i was given this info but just need to confirm its 100% correct. i will most likely fit a 1.3mm head gasket, but then i still need to take 12cc out
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| The Panel Van Man |
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You can get a thicker Steel shim gasket 4 layers not 3 Precision engine parts in Notting Hill Vic do one, that will help. Also BA turbo pistons and rods fit but end up as Zero deck.
_________________ SALT IS FOR RACING ON. SAUCE IS FOR FISH & CHIPS. |
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| hans hartman |
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misk_one wrote: i know i need to cc it all, but i cant exactly CC the pistons without pulling them out. i was given this info but just need to confirm its 100% correct. i will most likely fit a 1.3mm head gasket, but then i still need to take 12cc out you can with a perspex disc smaller than the bore and piston up top,small filler hole.you only need 1 as they should be a set.but can check them all for variations in size.look at piston tops and shapes to make it up,forged or other
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| misk_one |
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guys i didnt ask how i could lower the compression lol
i need to confirm the engine details... i know how to lower the compression, but i cant measure the pistons as this is my daily and need to have the parts together to do the head swap in the same day. i have a spare head which im prepping to swap over, i just need to make sure im getting the correct comp ratio in the end. but i cant work that out without knowing the size of the dish in the piston. my workshop manual tells me everything else, just not the size of the dish.
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| WagonDad |
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I CC'd the bore with the piston at TDC on my EF and got 10cc.
_________________ 4.0L EF Fairmont Station Wagon. EL GT Snorkel. K&N Pod in air box. 3" Intake piping.
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| hans hartman |
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WagonDad wrote: I CC'd the bore with the piston at TDC on my EF and got 10cc. will vary with deck height and rod length and pistons
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| tickford_6 |
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Posts: 6449 Joined: 11th Nov 2004 |
hans hartman wrote: WagonDad wrote: I CC'd the bore with the piston at TDC on my EF and got 10cc. will vary with deck height and rod length and pistons he's relying on workshop manual info for other specs, so slight manufacturing tolerance issue through the EF production changing wagondads figure won't matter anyway. |
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| WagonDad |
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Yes that 10 cc is from a standard EF bottom end. If you dont use the AU gasket 20" and go for good quality 40" gasket like a ACL race series you will drop your compression ratio .4 straight away. Be carefull when taking material out of the chamber not to reduce the quench area, this is the flat part of the head that sits inside the bore circumfrence, reducing this area will affect how the chamber has been designed to work, the quench area also helps reduce detonation by helping advance the flame front across the chamber.
_________________ 4.0L EF Fairmont Station Wagon. EL GT Snorkel. K&N Pod in air box. 3" Intake piping.
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| misk_one |
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the plan was to alter the chamber shape and size to be more boost friendly.
i was going to take it right out to the edge of the bore and taper in. i cbf trying to make this head work in an application its not designed for. so i will buy another head from the wreckers and start with that. im still not 100% sure on the size of EF/EL chambers, so if anyone can tell me that it will help. i thought they were around the same all the way through, but maybe not. if the head is the same as EB/ED then i will shave it a bit to end up with a chamber size of 59-60cc which will give 9-9.1:1 comp which will be fine. if its 64cc or larger in the chambers, then i can use an AU gasket.
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| WagonDad |
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My chambers measured 62.3cc but that was after removing material to de-shroud the valves, cant tell you the standard chamber size.
Don't taper the chambers out to the bore line you will loose power due to poor combustion. Read up on "quench" before you start, it is very important to the combustion process.
_________________ 4.0L EF Fairmont Station Wagon. EL GT Snorkel. K&N Pod in air box. 3" Intake piping.
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