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whats the au valve to tappet clearance? 

 

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 Post subject: whats the au valve to tappet clearance?
Posted: Wed Oct 31, 2007 1:37 pm 
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hey guys i just checking my clearances on my tappet to valve and found that there no gap at all times so im assuming it been over shimmed when it had a regrind with last owner.

anyone know the clearances???
for the exhaust and inlet.

any rule that i should be aware of when checking clearances?

 

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Posted: Wed Oct 31, 2007 4:02 pm 
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0 mate because they're hydraulic.

If they were too tight it would be holding the valves open and you'd soon tell by the way it runs.
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Posted: Wed Oct 31, 2007 4:05 pm 
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yer well did a compression test and i got 120 across all 6 cylinders

 

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Posted: Wed Oct 31, 2007 6:28 pm 
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Xflow wrote:
yer well did a compression test and i got 120 across all 6 cylinders


???120 what psi..
thats pretty damn low .
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Posted: Wed Oct 31, 2007 8:48 pm 
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I know especially when it a AU engine as well

thats why im checking tappets.

whats the trick you can try if u suspect if your rings are stuffed? spray oil in cylinder before compresion test.

 

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Posted: Wed Oct 31, 2007 10:58 pm 
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A squirt of oil is to seal the rings, that tells you it's a valve or head prob.

Does the car run ok? Missfire or anything?
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Posted: Thu Nov 01, 2007 12:43 am 
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if you think yor tappets are at fault just loosen your rocker gear off and re test compression if compression improves you know that they are holding your valves open

 

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Posted: Thu Nov 01, 2007 7:30 am 
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it runs ok but dose have a slight splutter at idel

 

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Posted: Thu Nov 01, 2007 3:14 pm 
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it sounds a bit strange to have all 6 cyl that low

did you change the cam or anything like that???
maybe the cam timing is out giving a all round low compression.

my au engine has 210 psi on all cyl..
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Posted: Thu Nov 01, 2007 4:18 pm 
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i haven't changed the cam but i think the previous owner did.

darn my psi out by 90psi massive difference between mine and yours

 

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Posted: Thu Nov 01, 2007 4:46 pm 
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i just noticed in your sig it says unknown turbo cam?

dont quote me on this but is there a possibility that your cam is profiled for a turbo set up and the valve over lap? or duration? is set in such a way that your compression is ment to be that low so you can run good boost without detonation issues.

im no expert but its a possible your cam could be the answer.
ive seen engines loose compression from a cam that wasnt dialed in properly or an adjustable cam gear that wasnt done up tight enough..
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Posted: Thu Nov 01, 2007 4:59 pm 
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well i could pop out number 1 plug and spin the engine around to TDC and pop rocker cover off and see if the cam gear spot on it TDC spot (to right of head lvl with top of head right?) or if it out by 1 tooth.
should be able to get away with that right? or it not close enough and i have to take off timing cover and line up the crack gear to the point and check?


if it all good then it could be cam over lap or rings or over shimmed

 

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Posted: Thu Nov 01, 2007 9:44 pm 
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If this unknown cam has a very late closing intake valve it would show up a low reading on a compression gauge. best to find out the cam specs befor getting to worried. or find a stock cam and put it in and do an other test.

 

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Posted: Thu Nov 01, 2007 9:50 pm 
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yer but the problem is there no one on ebay or trading post selling engines or heads and cams for au engines lol
you got everything for ea to el but wheres the au gear lol

 

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18" koya Strykers, AU engine with port and polish EB head, crow valve springs, standard cam, Large aftermarket RX7 turbo, T5 manual 3" intercooler piping, 600x300x100 intercooler core, MSII with innovate wideband O2 sensor and guage. BA F6 bodykit

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Posted: Fri Nov 02, 2007 10:51 am 
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Seeing as he supposedly set it up for a turbo, he maybe have dropped the comp ratio too!?!?
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