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Location:
Adelaide
Registered:
May 2002
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Standard comp test results for 4AGE 16V
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Tue, 03 August 2004 13:02
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Hello all,
Not a question, just a discussion really
A strange and possibly exciting thing Rex came across last week...
Work landed its container the other week so as you can guess it fell to Rex to leak and comp test all the engines. Among many there are two 20 Valves Black and Silver and a 16 Valve small/bigport hybrid.
Upon comp testing the 20 Valves they made approx 200 to 210psi from memory with very good leakdown figures.
The 16 Valve on the other hand with only 2 compression cycles cranked right off the dial (250psi max) and a very respectable 30 - 35% Leakdown. Not once, but repeatedly, all three times it was re-tested. Given these results, the fact that the manual says 179psi and the three puck brass TRD clutch and 3kg flywheel hanging off the back makes rex think that it may not be standard at all.
Have pulled sump and cam covers off but beyond that checking for goodies without dismantling the whole thing is difficult and quite honestly not worth it from a business point of view.
Just as a a starting/reference point whats the relationship between a compression test result and the compression ratio? He knows what each are but if CR has a large worthy effect on test results he would like to discuss.
Rex
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Location:
Sydney
Registered:
January 2004
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Re: Standard comp test results for 4AGE 16V
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Tue, 03 August 2004 13:17
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Just a question Rex. How did you do the comp test. It sounds like you have bare motors. What was the quickest way- do you hook them up to an ECU etc.
What did you use for leakdown, or maybe I'll search on the method 
Anyway I was searching this and found that the Comp ratio is pretty closely related to the cylinder comp..maybe. I found a couple of sites with turbo and N/A figures. Usually turbo model has say 8 to 1 instead of 9 to 1 and the cylinder comp considered normal was about 20 PSI lower on the turbo (low comp engine)..if I remember correctly. But then again the blue top and red top differ in comp ratio by about about the same and accoding to manual they should have same cylinder comp 
Seems logical though that the 2 should be related..
My 4AGE (blue top)..stock (never had head off) had readings of 200,200,220,220. I'm not sure why so high, but I think maybe a bit of carbon build up (doesn't ping though). Can't think of anything else.
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I supported Toymods
Location:
sydney.au
Registered:
August 2002
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Re: Standard comp test results for 4AGE 16V
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Tue, 03 August 2004 13:23
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off topic - but is said 16v for sale rex?
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Location:
Adelaide
Registered:
May 2002
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