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Can i Decomp 

 

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 Post subject: Can i Decomp
Posted: Sat Apr 14, 2007 3:27 pm 
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Location: sydney
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the motor in my xr6 runs acl race series pistons that are higher compression than standard, to turbo this can i get away with making up a decomp plate or should i propaly decomp the motor. thanks

 

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Posted: Sat Apr 14, 2007 3:44 pm 
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You can get away with it but you should properly decomp it.
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Posted: Sat Apr 14, 2007 8:53 pm 
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should do properly, but you can do it with a spacer as i have proven, im in the mid 300 rwkw range no problems

 

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EB 4L, 8.4:1, R154, GT4202r, 4in exhaust, Greenslade Engineering exhaust manifold, plenum chamber, 90mm throttle, Garrett W2A cooler, Surecam custom, autronic SM4, Bosch 120lb, Crane HI-6, LX-92, LM-1, Turbosmart Reg, 2x bosch 044, turbosmart 48 gate. 470kw+ @ 18PSI

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Posted: Tue Apr 17, 2007 3:50 pm 
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did you use twin headgaskets? (ie one on heach side?) im interested in the details as i am in the process of turboing my 250 and i have a 10:1 comp engine in it atm

cheers
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Posted: Tue Apr 17, 2007 6:52 pm 
Getting Side Ways
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lol, i was at 10.4:1, i took a couple of cc's from the chambers, and used a shim with a gasket either side

 

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EB 4L, 8.4:1, R154, GT4202r, 4in exhaust, Greenslade Engineering exhaust manifold, plenum chamber, 90mm throttle, Garrett W2A cooler, Surecam custom, autronic SM4, Bosch 120lb, Crane HI-6, LX-92, LM-1, Turbosmart Reg, 2x bosch 044, turbosmart 48 gate. 470kw+ @ 18PSI

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Posted: Wed Apr 18, 2007 3:38 pm 
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what comp was it afte that? was that just a standard ACL shim? i figured this would work well but was also concerned about push rod length.

cheers
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Posted: Wed Apr 18, 2007 6:50 pm 
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i used a permaseal one, first i had one custom cut by acl gasket company, but it didnt have the section that goes around the front of the head on the 4l, so i was gonna end up with timing cover sealing issues, the permaseal off the shelf one was an exact replica of the head gasket.... btw, i used MLS au falcon gaskets.

final comp came in at roughly 8.4:1 (as per signature)

my concern for the 4l was timing chain length, i managed this issue by spacing out the tensioner

 

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EB 4L, 8.4:1, R154, GT4202r, 4in exhaust, Greenslade Engineering exhaust manifold, plenum chamber, 90mm throttle, Garrett W2A cooler, Surecam custom, autronic SM4, Bosch 120lb, Crane HI-6, LX-92, LM-1, Turbosmart Reg, 2x bosch 044, turbosmart 48 gate. 470kw+ @ 18PSI

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Posted: Thu Apr 19, 2007 1:18 am 
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Power: 482 rwkw

Location: Penrith
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O ring the heads and use a copper .080 thick [approx] ACL gasket.. That's what I run...
If using 250 2v the rockers are adjustable...

 

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Posted: Tue Apr 24, 2007 8:11 pm 
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ive got a copper acl headgasket at home, has anyone o-ringed a straight six and tried to use one??
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Posted: Tue May 01, 2007 8:39 pm 
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[/url][/quote] used a permaseal one, first i had one custom cut by acl gasket company, but it didnt have the section that goes around the front of the head on the 4l, so i was gonna end up with timing cover sealing issues, the permaseal off the shelf one was an exact replica of the head gasket.... btw, i used MLS au falcon gaskets.


just wondering, cos ive got an ef with high comp pistons and shaved head and all that. i dont kno the comp ratio but i kno the cylinder pressure which is 180psi average, is that normal? wat decomp plate does anyone recomend and also ebs_4l wat sort and where did u get those gaskets and plate from and how much?? i cant seem to get much help locally...
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Posted: Fri May 04, 2007 1:01 am 
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Power: 482 rwkw

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ef_fairmont wrote:
Ive got a copper acl headgasket at home, has anyone o-ringed a straight six and tried to use one??

Yep "Cylinder heads dynamic" in Penrith did it for me..
Used a sealer between surfaces to prevent leaks...

 

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As in ZOOM 126 edition
331 Dart block,3.25/ 4340 steel crank, Oliver rods,TFS ported track heat heads, TFS track heat inlet Twin SC61 turbo's
Project 1UZ-EF has started.. S475 Turbo 4.0 V8 Mustang Celica.....

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Posted: Sun May 06, 2007 9:05 pm 
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iused race series on my 6 inch clevo and had massive bore wear , im talking like 15 thou in onlty a few thousand ks ,and then engine grenaded , ill never have a 6 inch clevo again or acl again or use gulgf western oil , how it all started i dont know but just to be safe
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