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post #1 of 14 (permalink) Old 30-03-2017, 19:22 Thread Starter
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Will this piston rings fit?

Hello, i need to change my 2003 vvc mg tf piston rings. i found these on ebay:

ROVER 216 218 416 MGF MGZS PISTON RING SET 1.6 1.8 | eBay

my VIN is SAARRD36N43D613556, so my car is a mg tf from mexico, so im not sure if they will fit.

i hope someone knows and can help. thanks
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post #2 of 14 (permalink) Old 30-03-2017, 19:29
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Yes Sir, they will fit.

Have you got a ring compressor?

Ps a TF made in Mexico?! - that's a new one on me...

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post #3 of 14 (permalink) Old 30-03-2017, 22:39 Thread Starter
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Thanks, well its was not made in mexico, just a special model sold here with 150bhp. We are about to have mexican made bmws here....
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post #4 of 14 (permalink) Old 30-03-2017, 23:21
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Someone might want to back this up but it's a good idea to measure the ring gap from the bottom of the stroke as that will be the most narrow point and thus the most compression the ring experiences in terms of tension.
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post #5 of 14 (permalink) Old 31-03-2017, 05:25
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Quote:
Originally Posted by Stargatemunky View Post
Someone might want to back this up but it's a good idea to measure the ring gap from the bottom of the stroke as that will be the most narrow point and thus the most compression the ring experiences in terms of tension.
Why would any engine have tapered bores?

(Even if correct) how does this help the OP?

I cant imagine the K series liners being internally tapered either. Of course every engine has tolerances/allowances, but that's a new one on me.

You would normally measure ring gaps at different points in the bore (while not fitted the piston) to help determine any bore wear, if that's what you mean?

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post #6 of 14 (permalink) Old 31-03-2017, 07:16
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Be aware that '160' pistons are different from all other lower output pistons so there may be a change in ring dimensions too.
I assume your 150 engine is a detuned 160 due to altitude considerations.
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post #7 of 14 (permalink) Old 31-03-2017, 14:49 Thread Starter
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I read the 150bhp are due to a lower compression , can piston rings change the compression? I can remove the rings and measure them . If the rings are different i dont think i will find them on ebay uk.
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post #8 of 14 (permalink) Old 31-03-2017, 16:20
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Hi, I've been having a read of Des Hammill's book "The Rover K-Series 16V Engine" in which he describes the various iterations of the K-Series engines and their development from 1989 thru' to 2005 when MGR stopped making them. They were/are of course still made for the very last of the TFs from China and presumably the MG6, etc, and labelled 'N-Series'.

He makes no mention of any differences between all 1.8 litre engines other than the vvc head for the 143 and 160 engines, stronger pistons on the 160 bhp and Turbo only and shorter connecting rods (by reducing machining dimensions only, rods are the same before machining) for the 1.8 Turbo which gives a lower compression ratio. I assume your low compression engine is either using the 'shorter' connecting rods or perhaps an added shim between the block and the head.

My conclusion from reading the book is that any 1.8 K-series piston rings should do the job but best to measure them when you get them.

Last edited by TipperMG; 02-04-2017 at 08:37.
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post #9 of 14 (permalink) Old 31-03-2017, 17:21
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Looks like the original piston rings with part number of LFP101320 covered all of the 1.6 & 1.8 K Series variants up to and including the 160 VVC's
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post #10 of 14 (permalink) Old 31-03-2017, 18:36
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The reason for checking the ring gap at the bottom of the bore is because that is the unworn portion of the bore. As the engine wears, the portion of the bore the rings rub on becomes worn, giving a very slight difference in diameter. A very worn bore will also become slightly oval as the bores wear on the thrust faces
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post #11 of 14 (permalink) Old 31-03-2017, 18:57
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On my 160 engine when stripped down with over 88k miles on the clock there seemed to be no bore wear at all and even the original liner bore honing was clearly visible all the way up. Given the lack of wear I didn't consider new piston rings but did refurbish the head with new valves, hydraulic lifters and valve stem seals.

It was stripped down due to cambelt breakage which caused 10 of the 16 valves to be bent! No piston/rod damage was found.
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post #12 of 14 (permalink) Old 01-04-2017, 23:41
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Quote:
Originally Posted by IanMc View Post
Why would any engine have tapered bores?
Due to the way the piston works against the liner during stroke.
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post #13 of 14 (permalink) Old 02-04-2017, 07:26
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Quote:
Originally Posted by TipperMG View Post
Be aware that '160' pistons are different from all other lower output pistons so there may be a change in ring dimensions too.
I assume your 150 engine is a detuned 160 due to altitude considerations.
The 'Mexico' version of the 1.8 VVC was detuned simply by reducing compression ratio by shortening the length of the con rod slightly. I am pretty sure MGR used the same length con rods for the 1.8 Turbo used in the later 75/ZT and if memory serves correctly, I think the con rods were about 3mm shorter than the standard ones.

There is only one part number listed for the piston rings for all the 1.8 K series engines, so it would appear that all have the same rings.
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post #14 of 14 (permalink) Old 03-04-2017, 21:06 Thread Starter
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thanks

thanks for the answers, ill buy them then
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