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what head gasket should i use in low boost app 

 

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 Post subject: what head gasket should i use in low boost app
Posted: Fri Jan 23, 2009 9:25 pm 
Oompa Loompa
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hey guys,

im rebuilding the head on my turbo au as some might know all the hasles ive had to deal with,

what head gasket should i use and where is the best place to get it from in brisbane, it supposively has a 1.5mm spacer to de comp the engine is this needed or can i use stantard gasket setup, only going to run about 5 psi after this is done

thanks heaps

 

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Posted: Fri Jan 23, 2009 10:08 pm 
Getting Side Ways
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if ur only after 5psi then just replace it with a standard AU gasket.
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Posted: Fri Jan 23, 2009 10:39 pm 
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yeah standard gasket is fine. standard torque on headbolts too.

 

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Posted: Fri Jan 23, 2009 10:47 pm 
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then you'll need 2!

 

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 Post subject: Re: what head gasket should i use in low boost app
Posted: Sat Jan 24, 2009 6:36 pm 
Oompa Loompa
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i got a spacer to decompress the head and a graphite gasket. correct me if im wrong but when i ordered the part that's what he said would be great, probably run about 7 im not sure yet? just wait and see

 

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 Post subject: Re: what head gasket should i use in low boost app
Posted: Sat Jan 24, 2009 7:43 pm 
Getting Side Ways
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gnarlyau wrote:
i got a spacer to decompress the head and a graphite gasket. correct me if im wrong but when i ordered the part that's what he said would be great, probably run about 7 im not sure yet? just wait and see


get the spacer and graphite gasket and put them in the bin, then go and buy a genuine mls au gasket

 

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 Post subject: Re: what head gasket should i use in low boost app
Posted: Sat Jan 24, 2009 10:49 pm 
Getting Side Ways
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If your going to run under 14 Lb the std comp will work fine..
If your after more power? Then dropping compression is the go..
Plenty have used two AU head gaskets without issues with NEW head bolts..
If your SURE you are going to run low boost? Then single std AU head gasket is fine..
Keep in mind two AU head gaskets being being multy layer metal.. It's fine to double up on them..
Cometic make MLS gaskets and compression can be change on them this way...
Cometic TMK don't make head gaskets for these engines..But if its good enough for them to do this
on Chevy/ Dodge and Ford engine's its fine here...

 

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 Post subject: Re: what head gasket should i use in low boost app
Posted: Sun Jan 25, 2009 8:35 am 
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listen to what ^^ has said


very knowlageble on boost :)


1 day when and if i boost he is the man i talk to :)

 

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 Post subject: Re: what head gasket should i use in low boost app
Posted: Sun Jan 25, 2009 12:00 pm 
Getting Side Ways
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Raising head with gaskets works ok on small bore engines like our 6's ..
But it can lead to detonation on V8's or larger bore motors..
This also depends on combustion chamber design and quench area..
If there is a large area between head and block ?
The exhaust flame can still burn and ignite early on next compression stroke..
This is NOT really an issue with sohc motors..


For example the M351/ M400 Clevo engine that superseded the 351 Clevo in U.S was used
on commercial vehicles.. Bassicaly the same Clevo block with higher deck height.. The piston was down the bore to reduce compression..
This engine detonated it's nuts off even tho comp was around 8.5 to1 ..
By rebuilding engine with flush piston deck.. The detonation disappeared!!!
With compression just over 9 to 1..
http://www.fordcobraengines.com/Modified%20History.htm

 

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 Post subject: Re: what head gasket should i use in low boost app
Posted: Sun Jan 25, 2009 4:03 pm 
Oompa Loompa
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can i run i high boost with the decompressed head and standard bottom head like 12 or some thing with out blowing the bottom end???

 

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 Post subject: Re: what head gasket should i use in low boost app
Posted: Sun Jan 25, 2009 4:58 pm 
Getting Side Ways
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gnarlyau wrote:
can i run i high boost with the decompressed head and standard bottom head like 12 or some thing with out blowing the bottom end???


u will be able to run 12 on standard au gasket

 

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 Post subject: Re: what head gasket should i use in low boost app
Posted: Sun Jan 25, 2009 5:49 pm 
Oompa Loompa
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sweet as it will turned up to about that now when its back together

 

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 Post subject: Re: what head gasket should i use in low boost app
Posted: Sun Jan 25, 2009 9:21 pm 
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I consider over 15b Lb as getting high in boost levels..
Our ED/AU Fairmont is tuned to 15 Lb ...
You have to consider size of turbo etc..
In some cases much more and the compressor heats the air more than compressing it as
it falls away from its efficiancy..
Valve springs etc need to be changed OVER 15 Lb boost and better cam is required also..
Which seems to be higher lift and wide Lobe centre's of 116, 114..
Keep in mind tune comes into play here.. No point in raising boost with an in tank that won't supply enough fuel.. Same with injectors.. I would head straight for 42 Lb as they are fairly common these days..Over 15 Lb is about where you have to think about lower static compression...
A T04Z has bigger comp map at higher boost compared to Gt3540 for example ..
GT40
Image

T04Z..
Image

 

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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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 Post subject: Re: what head gasket should i use in low boost app
Posted: Mon Jan 26, 2009 6:06 pm 
Oompa Loompa
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its got a t04e 600cc injecters and fuel pump, ill get it tunend to about 10 -12 psi mayb ever more on like a duel stage switch or something, it should be back on the road this weekend, where is the best place to get a boosted falcon tuned in s.e queensland

 

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