How much boost?

[Cow]

Guys,

anyone know how much boost the stock evo5 gasket can handle?

 

[Jun_EK9]

1.6bar.......

 

[JERRY_VR4]

1.6bar.......

stock woo ....

 

[godhand]

i think 1.3 is max ! if air fuel cannot target can burn the engine !

 

[PabloIceman]

Yeah .... better not boost until 1.6 man .... bakar your head gasket ... then teruk ....

Last time i kena .... cepat2 go change Metal head gasket ....

Use for few years until recently middle of this year the gasket also bocor ... so i hantar go workshop change metal head gasket lor ... :proud:

This topic already discussed a few times already. Do a search ..

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[JERRY_VR4]

i think if u're stock , 1.2 bar should be ok lah.

 

[Cow]

ok thanks guys :)

can ignore this topic already

 

[azizi.aziz]

sorry cow... just 'tumpang' the thread...anyone here can share some info...about metal gasket...0.7mm, 1.2mm and 1.6mm ...each of them for what purpose??? why there's different thickness.?:hmmmm:

 

[PabloIceman]

sorry cow... just 'tumpang' the thread...anyone here can share some info...about metal gasket...0.7mm, 1.2mm and 1.6mm ...each of them for what purpose??? why there's different thickness.?:hmmmm:

To adjust your compression ratio bro ....



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[azizi.aziz]

To adjust your compression ratio bro ....



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Yup , i know that... but mayb some of us can share more info...something like..(this figure IS NOT true one)...i guess only :hmmmm:

a) 0.7mm (compression 8.5:1) safe to boost max 1.5bar
b) 1.2mm (compression 8.0:1) " boost max 1.8
c) 1.6mm (compression 7.5:1) " boost max 2.2

who can share or advise on this...tq

 

[PabloIceman]

Yup , i know that... but mayb some of us can share more info...something like..(this figure IS NOT true one)...i guess only :hmmmm:

a) 0.7mm (compression 85.5:1) safe to boost max 1.5bar
b) 1.2mm (compression 85.0:1) " boost max 1.8
c) 1.6mm (compression 84.5:1) " boost max 2.2

who can share or advise on this...tq

Bozz, it doesn't work that way .....

read this ....

http://www.everything2.com/index.pl?node_id=766464


**Quote**

Examples:

basic

Stroke 100mm
Bore 87mm

gasket thickness ... i dint know but worked around


comp ratio = (cylinder volume + combustion chamber volume)/ combiustion chamber volume = 9.5

combustion chamber volume = some complicated stuff + head gasket volume
- head gasket volume = (.5bore ^2) * pi * height(thickness) = 69937.3965 (using algebra and solving for this in above formula w/ the 2 knowns)

cylinder volume = (.5bore ^2) * pi * stroke = 594467.87

to achieve about ~ 8.9:1

assuming

X = desired compression ratio
TCV = CCV + G = total combustion chamber volume
CCV = combustion chamber
G = gasket volume = (.5bore ^2) * pi * height(thickness)
using some algebra that would be tedious to type we get:

Cylinder volume = (X - 1) TCV .. some more algebra etc

To find a thickness to get u around 8.9:1

594467.87 = 7.9 * (69937.3965 + G) more algebra solve for g or shouldve done it earlier..

G = 5311.70095 (volume of addditional gasket) now solve for thickness

assuming the new gasket has the same bore as the cylinder (87mm)

additional gasket thickness would be ~.89 mm or ~.035 inches to achieve static 8.9:1 compression
an additional .025 inches or .635 mm should bring down the compression ration to about 9.0647:1

assuming the same bore as the cylinder.

Now u just need to know your original head gasket thickness.


Source from the above link & some other websites (rpw & EM). Figures purely theoretical.

Bear in mind that the piston tops are not flat landings ...

**UNQUOTE***





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[azizi.aziz]

Thanks paul, this is what i need...really useful info...

 

[PabloIceman]

Yup , i know that... but mayb some of us can share more info...something like..(this figure IS NOT true one)...i guess only :hmmmm:

a) 0.7mm (compression 8.5:1) safe to boost max 1.5bar
b) 1.2mm (compression 8.0:1) " boost max 1.8
c) 1.6mm (compression 7.5:1) " boost max 2.2

who can share or advise on this...tq

Thanks paul, this is what i need...really useful info...

U ONLY option (c) lah ....



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[Stormvolution 9]

Sigh!!! I think i hv boost leak pro le... My setting now - low 1.3 n high 1.5, mainly using low boost for street... But from my peak record, de cibai boost meter shown close to 2.0 la~ What's de pro?! Time to change to wastegate or at least get a brand new after market actuator? Pretty worrying, takut boom my 2nd turbo again!!! LoLzzzzzzzzzzzzzz...

 

[azizi.aziz]

U ONLY option (c) lah ....



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No lah bro...not targetting that high...more towards friendly on the street..hehe

 

[azizi.aziz]

Sigh!!! I think i hv boost leak pro le... My setting now - low 1.3 n high 1.5, mainly using low boost for street... But from my peak record, de cibai boost meter shown close to 2.0 la~ What's de pro?! Time to change to wastegate or at least get a brand new after market actuator? Pretty worrying, takut boom my 2nd turbo again!!! LoLzzzzzzzzzzzzzz...

aiya towkay...just install after market turbo kit la...and FCON V...your problem solved..

 

[PabloIceman]

Sigh!!! I think i hv boost leak pro le... My setting now - low 1.3 n high 1.5, mainly using low boost for street... But from my peak record, de cibai boost meter shown close to 2.0 la~ What's de pro?! Time to change to wastegate or at least get a brand new after market actuator? Pretty worrying, takut boom my 2nd turbo again!!! LoLzzzzzzzzzzzzzz...

aiya towkay...just install after market turbo kit la...and FCON V...your problem solved..

SV9, Cheaper option (if u can find some1 to lend u their actuator for checking purposes) ... If after testing confirmed actuator kong, then can get an aftermarket lor ... or ori ...

My 2 cents worth of thoughts!


Hope u get to the root of your problem soon.




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[PabloIceman]

aiya towkay...just install after market turbo kit la...and FCON V...your problem solved..

Only "Peniaga Bumiputra Besar" with $$$ printer in the garage will say this!!



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[azizi.aziz]

Only "Peniaga Bumiputra Besar" with $$$ printer in the garage will say this!!



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Correction "Peniaga Bumiputra Kecil dan Sederhana"...

 

[PabloIceman]

Only "Peniaga Bumiputra Besar" with $$$ printer in the garage will say this!!



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Correction "Peniaga Bumiputra Kecil dan Sederhana"...

But still the printer is there ..... :rolleyes:



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