Mahle OEM pistons - any good? - MG-Rover.org Forums
 
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post #1 of 11 (permalink) Old 08-01-2017, 08:28 Thread Starter
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Mahle OEM pistons - any good?

There's an ebay listing for new Mahle cast pistons. The listing says they're suitable for the 1.8T.
DMGRS is also selling them cheap (40 UKP ea)

Has anyone had any experience with these pistons?
Are they equivalent to the VVC 160 piston?
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post #2 of 11 (permalink) Old 08-01-2017, 18:00
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Why do you need them for?
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post #3 of 11 (permalink) Old 08-01-2017, 20:08
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If they are for the turbocharged engine then they will probably deliver a lower compression ratio, so will not be a direct replacement for a 160VVC.
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post #4 of 11 (permalink) Old 08-01-2017, 20:32 Thread Starter
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Thanks all.

@Talkingcars, I'd like a safety margin as I increase the rev limit. I don't want the piston failing.

@blackoctagon, The 1.8T uses the same / very similar pistons to the 1.8. The compression is lowered via shorter rods.
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post #5 of 11 (permalink) Old 08-01-2017, 20:45
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In that case then i'd suggest cross-referencing part numbers.
I imagine they will be the stronger land type pistons, so should be more durable than old VVC ones, but if there are no structural differences such as dishing for CR changes then they are probably a straight swap.

It's a rare engine where the turbo uses NA pistons, but if it is only shorter rods then it may be ingenious cost saving from MG Rover.
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post #6 of 11 (permalink) Old 08-01-2017, 21:46
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I seem to recall that the K series 1.8T con rods were about 1.5mm shorter than those for the 1.8VVC and 1.8 non-VVC, to lower the compression ratio and reduce the strain on the engine internals due to fitting the turbo. IIRC, the con rods used were the same length as those used for the 'Mexico' spec 1.8VVC (where issues with fuel quality necessitated a reduction in CR, and a consequent reduction in output to 150ps) - possibly the same part?.

The 1.8T uses the same pistons as the 1.8VVC (the '160' pistons).
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post #7 of 11 (permalink) Old 08-01-2017, 21:49
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With my standard 1.8 K series it was the ringland metal between the 1st & 2nd rings that broke away in two of my pistons as in this detailed K series pistons link which I think is their greatest area of weakness ;

K pistons

I understand that one of the main differences between all 143VVC and lesser K series engines and the 160VVC engines is that the ringland gap between the 1st & 2nd rings is greater meaning the 160VVC pistons can survive higher power outputs and revs before they fail.

Is there a spec of the Mahle pistons anywhere to possibly compare these pistons to the standard ones in the ringland area?
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post #8 of 11 (permalink) Old 08-01-2017, 23:22 Thread Starter
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Here's a link with photos showing the differences between the 1.8T conrods and the NA conrods.

Compression ratio
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post #9 of 11 (permalink) Old 08-01-2017, 23:31 Thread Starter
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Just sent off a request for the Mahle part number to DMGRS.
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post #10 of 11 (permalink) Old 10-01-2017, 05:26 Thread Starter
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The Mahle part number is 202 PI 00001 B00.
I couldn't find specific information in their catalog.
Mahle supplies this piston for the Roewe 750, which uses the Chinese derivative of the 1.8T.

I suspect Mahle supplied the original "weaker" k-series pistons. Whether this is the same piston is unknown.
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post #11 of 11 (permalink) Old 10-01-2017, 09:59
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Mahle supplied the original factory fit pistons and piston rings for the K series until 1991; from then on both were supplied by a sub-division of Federal-Mogul.
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