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Registered
Join Date: Mar 2019
Posts: 8
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Conversion from 217 to 231 HK
Hello forum
I am thinking to Update my 88`carrera to 231hk , 95000 miles Question is? I allready have my heads off due to High Oil consumption, So🧐is the only diff between 217 and 231 the pistons? Or do i also have to repl cylinders?dme chip Update ? Cam timing etc. My cylinders is finde, only needs a light honing,but new ring needed, but still within limit. In Europe we dont have the low oktane problem goes from 92-100 oktane Hope you Can help Reg Jesper |
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03-03-2019, 11:53 PM
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Registered
Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,519
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The Mahle 3.2 pistons have the same casting numbers in the pistons.
In comparison of the two, the 10.3 are a couple mm taller on the high lobe piston face. The cylinders are the same Nikisil. Bruce |
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03-04-2019, 06:44 AM
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Thanks Bruce 👍
So the only thing i do is to repl pistons with new mahle EU 231hk pistons and rings? Thats all!,,, |
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03-04-2019, 07:17 AM
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Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,519
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The euro spec engine changes the cam timing, virtually everything else on the long block are identical.
Bruce |
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03-04-2019, 10:19 AM
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Posts: 8
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Timing
Thanks Bruce
Do you know the timing value on EU spec. ? Acc to waynes book there is only one value 1,1-1,4🤔so i am a little confused Reg Jesper |
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03-04-2019, 11:05 AM
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Registered
Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,519
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Low battery, my teaching moment disappeared.
Youre correct on all carrera cam timing is ideal setting 1.25 with 1.1/1.4 the window. The carrera and SCs use the same cam and there is different settings for 3.0 US and Euro across the compressions. Bruce |
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03-04-2019, 04:45 PM
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Registered
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Make sure your cylinders are nikasil. Some were made by Kolbenschmidt which were Alusils. Those cannot be honed. Check with a little magnet on the cylinder walls and by counting the cooling fins. Magnetic and 11 fins: Nikasil.
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03-05-2019, 01:02 AM
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Join Date: Mar 2019
Posts: 8
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Thanks for inf. Both,👍 my cylinders have 10 fins 🤮
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03-05-2019, 02:48 AM
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Quote:
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03-05-2019, 02:55 AM
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Registered
Join Date: Mar 2019
Posts: 8
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Hej Martin
Denmark Roskilde Har skrevet til dig på fb |
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03-05-2019, 03:29 AM
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Registered
Join Date: Sep 2015
Location: Costa Rica and Pennsylvania U.S.
Posts: 3,301
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3.2--3.4
You are in luck with Alusil bores.Have them opened up to 98mm with Nicasil and use CP Pistons.Replating the Alusils holds up better than replating Nicasil.CP Piston is also way lighter.Chip will have to be changed but 250 HP for the same amount of money.Lighter flywheel and you are there.Ciao Fred
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03-05-2019, 03:35 AM
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