differene between the 2.0l and 2.5l v6? - Page 2

kaiser · 22nd February 2018, 14:24

Can be the piston height above the gudgeon pin or the shape of the dome, or both.

minimutly · 22nd February 2018, 16:47

In a similar vein to "show someone how to feed themselves....", what I'll say here is that you need to check the part number of a 2l piston against the part no of a 2.5 piston. If the are the same or interchangeable you can guarantee the rod is the only difference.

kaiser · 22nd February 2018, 16:58

When my 1.8T broke the one piston and liner, I used the liner and piston from a Freelander. The difference in compression is caused by the length of the con rod, the pistons were interchangeable, although somebody says they do have different part numbers. I used it and still do but never checked the part numbers, so I don't know.

Mike Noc · 22nd February 2018, 17:33

Quote:

Originally Posted by kaiser

The reason for my trick question reply is that the rod length has nothing to do with stroke, that is given by the crank only.
The length of the con rod only affects the compression.

And, of course, it affects the clearance between the pistons and the heads/valves.

minimutly · 23rd February 2018, 23:04

Quote:

Originally Posted by kaiser

When my 1.8T broke the one piston and liner, I used the liner and piston from a Freelander. The difference in compression is caused by the length of the con rod, the pistons were interchangeable, although somebody says they do have different part numbers. I used it and still do but never checked the part numbers, so I don't know.

This post is misleading, since it relates to the 1.8, not the v6. And there were various different pistons used on the 1.8k, all of which would fit, but there were differences in ring land width, valve cutouts, and even compression height.
Oddly, the v6 liner fits the 1.8, but thats all that does. If rover had used any sense they would have made the bore smaller and the stroke longer...

grout20 · 24th February 2018, 08:07

Quote:

Originally Posted by rrobson

hopefully a fairly quick one this.
cheers

Hi Reece
Not intending to hijack your thread but just noticed your signature....

What is / how to use... an "auto gearbox pressure tester?"

Just curious

Regards
John
(recent change to become an auto owner! :-)

rrobson · 24th February 2018, 08:34

Quote:

Originally Posted by grout20

Hi Reece
Not intending to hijack your thread but just noticed your signature....

What is / how to use... an "auto gearbox pressure tester?"

Just curious

Regards
John
(recent change to become an auto owner! :-)

Nothing particularly complicated, there are a couple of tapping points on our gearbox which can help diagnose some of the mechanical problems we have. This is obviously a tool to which can make use of these points

22nd February 2018, 14:24	#11
kaiser This is my second home 75 Tourer 2.5 Auto, 1.8T, 75V8ZT Join Date: Jun 2007 Location: Johannesburg ZA Posts: 6,200 Thanks: 1 Thanked 859 Times in 613 Posts	Can be the piston height above the gudgeon pin or the shape of the dome, or both. __________________ Worth his V8 in gold

22nd February 2018, 16:58	#13
kaiser This is my second home 75 Tourer 2.5 Auto, 1.8T, 75V8ZT Join Date: Jun 2007 Location: Johannesburg ZA Posts: 6,200 Thanks: 1 Thanked 859 Times in 613 Posts	When my 1.8T broke the one piston and liner, I used the liner and piston from a Freelander. The difference in compression is caused by the length of the con rod, the pistons were interchangeable, although somebody says they do have different part numbers. I used it and still do but never checked the part numbers, so I don't know. __________________ Worth his V8 in gold

22nd February 2018, 16:47	#12
minimutly Posted a thing or two mg zt Join Date: Mar 2014 Location: cardigan Posts: 1,087 Thanks: 28 Thanked 187 Times in 158 Posts	In a similar vein to "show someone how to feed themselves....", what I'll say here is that you need to check the part number of a 2l piston against the part no of a 2.5 piston. If the are the same or interchangeable you can guarantee the rod is the only difference.