 AA 98mm Biral cylinder/pistons, rebuild of type 4 in 912E |
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| john maples |
 Jun 10 2015, 02:12 PM
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#1
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Newbie  Group: Members Posts: 5 Joined: 4-June 13 From: Hunt, TX Member No.: 15,965 Region Association: None  |
Hi All,
Has anyone had experience with the AA 98mm Biral cyl/piston sets? My only source of info on these seems to feel the cast iron is a little soft but could be nikasil coated to make a fine cylinder. I would like to keep the Ljet if possible but may need to increase injector size. Any thoughts? I will be rebuilding the 2.0 in my 912E and am considering options. Thanks, John |
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| 914Sixer |
Jun 10 2015, 07:43 PM
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#2
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914 Guru Group: Members Posts: 8,882 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region 
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96mm is the usual next step up and are plug and play. You can always call Randy at the VW shop in Comfort and run it by him. It shows the 98mm will need case machine work along with the heads.
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| john maples |
Jun 11 2015, 06:17 AM
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#3
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Newbie Group: Members Posts: 5 Joined: 4-June 13 From: Hunt, TX Member No.: 15,965 Region Association: None |
Thanks Mark,
My first thought was the 96mm step up but you know what they say about displacement... The extra 2mm per hole may not be worth the extra machining expense. John |
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| r_towle |
Jun 11 2015, 06:48 AM
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#4
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Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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103 MM pistons, go up to 2.4, Ljet will support it.
Ljet needs a mild almost stock camshaft or the air waves can create flutter. Elgin Camshafts webcamshaft Type4store All know these camshafts. Elgin will give you advice etc. European Motor Werks (EMW) in California has lots of the parts, a machine shop and will also talk about different builds. Not sure of your average temps, but heat will be an issue. So, an external oil cooler (mounted to the underside of the deck lid on the 912 will work, ALA 911... EMW sells the cheaper version of plated aluminum cylinders, LN engineering sells the higher end...those do help reduce heat. Rich |
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| 914Sixer |
Jun 11 2015, 05:30 PM
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#5
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914 Guru Group: Members Posts: 8,882 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region
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Heat will be an issue here 6 or 7 months a year.
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| Mueller |
Jun 11 2015, 08:03 PM
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#6
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914 Freak! Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None
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I've seen others ask about these Birals before with no real answers, I'd call AA or EMW and see if they can give you a customer referral for those exact parts.
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