Click Here -> Please Consider Making a PayPal Contribution to the FordSix Forum!
2019 Contributors:
NJwpod, 1strodeo, mightynorseman, maxtrux, 6d7coupe, broncr, Phase3, 68Flareside240, bmbm40, mustang6, WorldChampGramp, justintendo, BigBlue94, ags290, motorsickle1130, Rooster, ousooner919, ethanperry, rzcrisis, DoctorC, jamyers, Motorboy, fastpat, Silverback280, chad, drag-200stang, THE FRENCHTOWN FLYER, Jimmys61falcon, rjonah, Sooshi, Robert92867, Invectivus


PLEASE TEST ON http://dev.fordsix.com

<<<***PLEASE READ*** New Site Update >>>

Block and Piston Specs for AU Engine Needed

Moderator: Mod Squad

User avatar
rocklord
Registered User
Posts: 1357
Joined: Sat Jul 21, 2007 11:25 pm
Location: Hurricane, WV

Block and Piston Specs for AU Engine Needed

Post #1 by rocklord » Thu Nov 10, 2016 11:22 am

I need some specifications for my AU 4.0 engine to calculate the static compression ratio if I install a Tickford 94DT head. I've been told that the Tickford 94DT head has a chamber volume of 60cc, whereas the AU head is 65cc.
I will cc the Tickford head after machine work to be sure. I want to keep the CR below 10.0 to be able to still use 93 Octane unleaded. I don't want to pull the current AU head until I have everything ready to install.

What is the stock compression height (CH) of the AU 4.0 piston?
What is the recess volume of the stock AU piston?

I've seen websites stating compression heights of 1.208", 1.215", and 1.2165".
Very confusing.

The other question I have is the stock AU block, or deck height.
Doing a search of other forums I came up with a post stating that the deck height is "somewhere" around 9.2-inches. Another website stated the deck height as 9.22-inches.
I don't have access to local (Australian) reference material so I can't look it up.
So I'm wondering what the stock deck height of the AU block is?

Any help is appreciated.
Dan

Currently Own
1965 Mustang, 200CID, 3Spd
1964 Corvair Coupe, 164CID, 140HP, 4Spd
1961 Corvair Lakewood wagon, 145CID, 80HP, 2Spd Powerglide Auto.
2020 BMW X3 M, 3.0L Dual Turbo, 473HP, 8-Spd Auto. 0-60mph 4.1sec; 174mph Top Speed.

User avatar
xctasy
VIP Member
Posts: 7069
Joined: Sat Nov 09, 2002 10:40 am
Location: PO Box 7072 Dunedin 9011,South Island, NEW ZEALAND
Contact:

Re: Block and Piston Specs for AU Engine Needed

Post #2 by xctasy » Fri Nov 11, 2016 7:31 pm

rocklord wrote:I need some specifications for my AU 4.0 engine to calculate the static compression ratio if I install a Tickford 94DT head. I've been told that the Tickford 94DT head has a chamber volume of 60cc, whereas the AU head is 65cc.
I will cc the Tickford head after machine work to be sure. I want to keep the CR below 10.0 to be able to still use 93 Octane unleaded. I don't want to pull the current AU head until I have everything ready to install.

What is the stock compression height (CH) of the AU 4.0 piston?
What is the recess volume of the stock AU piston?

I've seen websites stating compression heights of 1.208", 1.215", and 1.2165".
Very confusing.

The other question I have is the stock AU block, or deck height.
Doing a search of other forums I came up with a post stating that the deck height is "somewhere" around 9.2-inches. Another website stated the deck height as 9.22-inches.
I don't have access to local (Australian) reference material so I can't look it up.
So I'm wondering what the stock deck height of the AU block is?

Any help is appreciated.



I'm not, nor ever will be, and OHC man. The metics, they screw you over....But 9.22 " for sure.


To get more piston choice from German pistons from Mahale (simlar to why pistons from from Subaru, Chev's GM 4200, and Cologne 2.8/2.9 V6's ran sub 3.736" pistons sizes). So they are 48 thou under 250 pistons. Or 104 thou under 305/229 Chev pistons.

If you over bore, you can then use pistons like the similar CH 3.3 or 3.7 Mopar pistons, they are 1.22 or 1.26 from your past info, and 6" Chevy rods are what I'd use.


The websites list egg head numbers, which need converting with a "Divide by 25.4" to get PROPER UNITS.


And Liters, um LitREs.


British Gallons rather than proper US Gals.

Image

https://www.zazzle.co.nz/a_metre_is_3_2 ... 6869393890

And Aluminum, um AluminIum.

And KM/H which they call Kpa, drongos,, i'll never forgive um forit.


I like and have gotten used to metrics, the FRENCH ARE COOL, but its just another smack over for the grey matter, and its never nice having to do the change overs. Same with cc's,

DIN kW


DIN Nm

and torque tightening conversions, and the boron head pre AU 2 cylinder bolt stud issues and replacement Mahale pistons, CP parts and piston rings variances since Repco listed ACL as a sold off company has made the information gathering a proper SH!+.

Historic changes before AU.

Pistons varied. PRE el 2 Rods were generally 5.88 +/- .005, but the last EL's were EL2 Intech Half breads with AU internals, long rod 6.060" engines with the 1.205 clearance target to get a zero deck.




For a zero deck, and the blanket old 250'S 3.91 crank stroke they used till the day of the 4.0 I6 death, the idealised piston with 5.88" rods would be 1.385", and 1.205 with 6.06's.

The pistons and valve gear changed throughout the course of SOHC life, and the heads were reprofiled many times,


Just like the X-flow, had about 9 different head castings with "no two alike" machining, the SOHC had the same variances.


NB//

Now I haven't looked/checked my bookes, because today I've been working the last 12 hours after 8 hours of truck driving...


but , IIRC, I can't remember, but the 5.6 T3 stock bore "347" has the same piston deck register as the AU to BF/ FG, something like 1.163" pstons, a 42 thou shortfall to the dry deck block.


CP pistons forged are the ideal compression height becasue these engines like to rev, and the block and cranks do flex a little.


For the AU, they changed the rocker arm ratio too, from 2.0:1 to 1.8. There were pictures on the net here by Magnus, showing the head casting changes, but I won't be able to find that since I'm bussy again....


I probably won't be back for a L-O-N-G time.


You'll get the answers you seek. Join and go find and hassle Aussies on there forums if you are eligable, and keep asking them. They are salt of the earth, and there knowledge is encylopedic. My knowledge base is from the ardour of the Australian Information highway. Rupert Murdock and Kerry Packer have trained the smartest "journo's", but they don't ask "Hod Rod" tech questions. Kevin Bartlett at ACP Mens "Street Machine" is the man for tech info.


Don't worry about forum hazing, Aussies play Oz Rules and Cricket is there national game, and for non Aussies, like (Kiws and Yanks and Canucks), we've just gotta undestand the culture. Its just the ignorance that comes from unabashed love for there Geelong In Line Sixes!



Kiwi culture and Aussie culture is largley the same, but there are some really ingorant Kiwis around and the Kiwi media is unhelpfull.
Image
XEC Ltd ICBE's Inter Continental Ballistic Engines-
FAZER 6Bi (M112 & EEC5) or FAZER 6Ti (GT3582 & EEC5) 425 HP 4.1L/250 I-6
FAZER 6V0 3x2-BBL Holley 188 HP 3.3L/200 I-6 or 235 HP 4.1L/250 I-6
X-Flow Engine Components Ltd http://www.xecltd.info/?rd=10

User avatar
xctasy
VIP Member
Posts: 7069
Joined: Sat Nov 09, 2002 10:40 am
Location: PO Box 7072 Dunedin 9011,South Island, NEW ZEALAND
Contact:

Re: Block and Piston Specs for AU Engine Needed

Post #3 by xctasy » Sat Nov 12, 2016 4:50 am

viewtopic.php?f=3&t=67134


Conrod 6.058 to three decimal places...

FG = Last DOHC to 2011-2016

http://www.precisionintl.com/CategorySe ... alcon%20FG

"Pistons Ford Car Falcon FG Category Search - Precision International Pistons, PFO3986D60001H, STD 020 030 040 Set of 6 Up to 10/2005 Includes MOS2 coating on skirt Use RS3987 piston rings Compression height 30.9mm ..."

30.9/25.4 = 1.2165"

EB = 1992 first 3.632" bore Falcon SOHC

"Mahle Motorsports Pistons Ford Car Falcon EB Brand Search - Precision Pistons, PFO39006040MMS, 040 Mahle Motorsports forged (approved for saloon car series) Set of 6 (use RS1792 piston rings) Compression height 35.48mm -"


35.48/25.4 = 1.3968"

AU search:-

http://precisionintl.com/StockSearch.as ... MMS&Item=1

EF search:-

http://www.precisionintl.com.au/BrandSe ... L8H&Item=2
Image
XEC Ltd ICBE's Inter Continental Ballistic Engines-
FAZER 6Bi (M112 & EEC5) or FAZER 6Ti (GT3582 & EEC5) 425 HP 4.1L/250 I-6
FAZER 6V0 3x2-BBL Holley 188 HP 3.3L/200 I-6 or 235 HP 4.1L/250 I-6
X-Flow Engine Components Ltd http://www.xecltd.info/?rd=10

User avatar
xctasy
VIP Member
Posts: 7069
Joined: Sat Nov 09, 2002 10:40 am
Location: PO Box 7072 Dunedin 9011,South Island, NEW ZEALAND
Contact:

Re: Block and Piston Specs for AU Engine Needed

Post #4 by xctasy » Sun Nov 13, 2016 1:54 pm

See http://www.xfalcon.com/forums/index.php ... son-chart/

noobus wrote:There is a few indiscrepancies in the line up as ive found a few errors on ACLs site so i just wanna throw this by everyone here first before i start ordering parts.


Image

Line 3, 30.88/25.4 +1.2157" (difference to 30.90 or 1.2165 is a metric rounding error typical of the SI system)


Dish is 0.25 cc's.

An other measurementfor the con rod is 6.057 instead of 6.058".

Whats 1 thou between friends...an engine rebuild!

ACL is just an appalling website. NCAA= No class at all, but errors everywhere. I guess if you put no info in it, you won't make any mistakes....

I guess its all bankrupt and sold off to the lowest bidder now, like the Aussie aftermarket, heading down the gurgler...

Image

http://www.aclperformance.com.au/Ford4. ... istons.htm


Where the heck is the info, guys?

Lemmie tell you, after years of growing up on a diet of 12 to 20 dollar US Hot Rod magazines with all the information, the Aussie sites and magazines are simply useless.

The Aussie forums make up for it, tho', simply astoundingly good.
Image
XEC Ltd ICBE's Inter Continental Ballistic Engines-
FAZER 6Bi (M112 & EEC5) or FAZER 6Ti (GT3582 & EEC5) 425 HP 4.1L/250 I-6
FAZER 6V0 3x2-BBL Holley 188 HP 3.3L/200 I-6 or 235 HP 4.1L/250 I-6
X-Flow Engine Components Ltd http://www.xecltd.info/?rd=10

Who is online

Users browsing this forum: No registered users and 3 guests