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Old 07-07-2017, 07:39 PM   #1
cosmos328Ci
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Cylinder Head Lift Under Boost??

After pulling down my engine that lost oil pressure which also used to pressurise the cooling system under boost, at the time it was around 20psi.

Inspecting the the engine block and cylinder head for combustion leak into coolant ports and the exterior of the MLS gasket there is no evidence, so instead of blowing the head gasket... I have head lift instead?... as when driving around below boost or maybe just a couple of pounds here and there there is no pressurisation in the cooling system.

With my spare engine in doing the work now with the schrick cams the boost dropped to about 17.2 - 17.4 psi but still pressurised the cooling system.

Therefore... more clamping force is required other than just a better or new head gasket.

Last night did some tests on OEM head bolts, ARP Ultra Lube (AUL) by its self and AUL with engine oil.
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Last edited by cosmos328Ci; 07-07-2017 at 07:45 PM.
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Old 07-08-2017, 04:58 AM   #2
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Did you heat cycle the head gasket correctly?
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Old 07-09-2017, 12:02 AM   #3
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It's one of my spare engines, already had about 120,000 km on it.
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Old 07-09-2017, 09:30 PM   #4
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Originally Posted by cosmos328Ci View Post
It's one of my spare engines, already had about 120,000 km on it.

Oh. I thought you installed a New head gasket and cams.


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Old 07-09-2017, 11:54 PM   #5
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No, no new head gasket yet.

I just put the cams in one of my spare engines and then put that spare engine in the car.

So I have a machine shop lined up to do a bore, hone, plateau hone, deck and machine head.

last part i need - Still looking for forged pistons before I will get the machine work done.

M11 time-sert the block and time-sert the head for cam trays.

Then I will slap it all back together with the cut-ring head gasket.

Then increase boost to 30psi.
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Old 07-10-2017, 06:39 AM   #6
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Originally Posted by cosmos328Ci View Post
No, no new head gasket yet.



I just put the cams in one of my spare engines and then put that spare engine in the car.



So I have a machine shop lined up to do a bore, hone, plateau hone, deck and machine head.



last part i need - Still looking for forged pistons before I will get the machine work done.



M11 time-sert the block and time-sert the head for cam trays.



Then I will slap it all back together with the cut-ring head gasket.



Then increase boost to 30psi.


With the ts? 30psi. Hmmm. You're not worried about melting it?


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Old 07-10-2017, 07:46 AM   #7
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Yes, with the TS - 30psi is most likely not achievable without over spinning the TS more (I am already over spinning the TS). I would be happy with around 22psi, as at the moment I am around the 17.2 - 17.4 psi because of the cams - was at around 20psi before cams.

I hope to gain some more psi by increasing the throttle body (TB) size to to 4inch.
At the moment I have 3.5 inch TB mounted to the TS OEM size hole in the snout.

First: open the TS snout hole out to the 3.5 inch size of the TB - Dyno.
Second: adapt the TS snout to fit the 4 inch TB - Dyno.

After this I am really at the TS limits and will have to look at getting a bigger TS on the manifold. (I have done some measurements and looked at re-routing the by-pass valve, Etc, to fit the next size TS)

But, I really don't think I will go any further to have to use the next size TS.

Thanks for responding to the 30psi remark.
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Old 07-10-2017, 04:12 PM   #8
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Quote:
Originally Posted by cosmos328Ci View Post
Yes, with the TS - 30psi is most likely not achievable without over spinning the TS more (I am already over spinning the TS). I would be happy with around 22psi, as at the moment I am around the 17.2 - 17.4 psi because of the cams - was at around 20psi before cams.



I hope to gain some more psi by increasing the throttle body (TB) size to to 4inch.

At the moment I have 3.5 inch TB mounted to the TS OEM size hole in the snout.



First: open the TS snout hole out to the 3.5 inch size of the TB - Dyno.

Second: adapt the TS snout to fit the 4 inch TB - Dyno.



After this I am really at the TS limits and will have to look at getting a bigger TS on the manifold. (I have done some measurements and looked at re-routing the by-pass valve, Etc, to fit the next size TS)



But, I really don't think I will go any further to have to use the next size TS.



Thanks for responding to the 30psi remark.


Exciting times ahead


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Old 07-10-2017, 06:40 PM   #9
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LOL.

I have decided to buy some 10mm Raceware Head Studs to try and clamp down the existing engine head with the schrick cams so I can get it on the dyno to see how much difference the cams made.

Where did you get yours from?
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Old 07-10-2017, 08:13 PM   #10
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Originally Posted by cosmos328Ci View Post
LOL.



I have decided to buy some 10mm Raceware Head Studs to try and clamp down the existing engine head with the schrick cams so I can get it on the dyno to see how much difference the cams made.



Where did you get yours from?


VAC I didn't bother shopping around. I ordered all my parts from them. Just easier


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Old 07-11-2017, 01:47 AM   #11
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Thanks Davconelectric.
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Old 07-12-2017, 09:39 PM   #12
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VAC Motorsports have not responded to any of my questions over the last couple of days. So, I have no idea what is going on with my order.

Achilles responded nearly straight away.

Oh well... Live and learn.
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