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Old 12-04-2019, 01:34 PM   #1
Avtovaz
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Default 531 head and skim

ive found a problem with teh 530 head, so im going to go with the 531 i have. So, ill use standard valves, its on a b230a so its got dished pistons, cam lift will be like 13mm, and im using a cometic 0.5mm gasket.

Im not sure what to skim off the head, or even what to aim for really. we have 98 fuel here, and itll be on lh2.4 but i want as much power as i can get.

is 12:1 about right static? thanks
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Old 12-05-2019, 08:55 PM   #2
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I know from personal experience you can skim at least 3mm off of the head and be fine. With a thinner head gasket and B230F pistons (also dished but may be different) it measured out to about 10.8 to 1 on 93 AKI (about 98 RON) and runs great on tuned LH 2.4 and EZK. What cam are you running? Dynamic compression is a lot more important than static especially with regard to avoiding detonation.
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Old 12-10-2019, 02:20 PM   #3
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thanks for the reply, im looking at a kl racing stage 5 cam, but not sure yet, that has 12.9mm lift, and 300 deg, that on the 531 with standard valves, twin vale springs, probably solid lifters, but may have to use the stnadard bucket shims on it yet.


not sure what to skim off it and what the dynamic is as i dont know how to work it out properly.
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Old 12-10-2019, 03:43 PM   #4
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The basic limit for valve lift without going to larger diameter buckets is 12.5mm. Lift above that enem suggests a 37mm bucket if I recall correctly. When Hank Scorpio and I bought enem cams together. He bought a K15 turbo grind because that was the max lift you could go without changing the buckets.
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Old 12-10-2019, 03:48 PM   #5
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right ok so i defo need to get the shims sorted, but no where does the 8mm shim in 6mm is the size i need.


Im in the uk too btw, so getting stuff from sweden is quite expencive.
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Old 12-10-2019, 03:59 PM   #6
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Sounds like you gotta take the ferry across the north sea and go shopping.
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Old 12-10-2019, 04:02 PM   #7
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i think they are the same as some ford ones or something, ive asked on some british forums, see what they say. My sister lives in texas and when my brother and mother went over recently they brought me back a cometic head gasket as hand luggage lol ;)))
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Old 12-10-2019, 04:56 PM   #8
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I included Hanks K15 turbo cam in my purchase from enem. Then shipped it over to him in CA. When enem shipped me my package they sent the wrong three cams. So he sold me those at a great deal because he didn't want them back. Then they shipped me my actual order. The hottest cam I have yet to try is a V16 turbo grind. I have ran both turbo and non turbo versions of the V15 and while it's a great cam for a street performance engine. The V16 or above is what to use for performance engines in my little bit of experience. That seems like a great cam. I just wanted to mention the lifter stuff because I think you also have to bore the hole in the head for the bucket to work. enem used to sell those parts so it would all work together.

Last edited by dl242gt; 12-10-2019 at 04:57 PM.. Reason: make corrections
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Old 12-10-2019, 05:33 PM   #9
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With the KL t5 cam, you should be able to use stock buckets as it's a reduced base circle cam. I think the issues with engines loosing shims was the lobe contacting the edge of the shim, valve float issues, and poorly fitting lash caps.

Since the KL t5 is such a reduced base circle, high quality air-cooled VW valves are just about a perfect fit. Single groove keeper, and plenty of spring and retainer choices that will keep it all under control at high revs.

These valves are basically "drop-in" if you're going to use OS valves with the reduced base circle cams: https://www.cbperformance.com/produc...rgripvalve.htm
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Last edited by culberro; 12-10-2019 at 07:01 PM..
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Old 12-10-2019, 05:44 PM   #10
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Check your piston deck height the motor I just built stuck the pistons out of the deck .015".
I used a Mahle gasket for clearance.
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Old 12-10-2019, 06:07 PM   #11
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I recall when talking with enem they told me about the lobe hitting and thus the need for the larger bucket. Those are stock base circle cams. I used to buy air cooled type 1 goodies from CB performance many years ago. Them and Gene Berg were a couple of my favorites. Thanks!

As an aside. I recently sold my 1963 Hot Rod magazine VW performance special and my 1975 Motion Minicar VW performance catalog on ebay.
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