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1098 pistons
Posted: Mon Dec 29, 2003 2:35 pm
by turbominor
Any one know how big the dish in standard 1098 pistons are ( eg 3 cc)
Engine code is 10v if that helps!
Posted: Mon Dec 29, 2003 9:05 pm
by stormin
Hi Iain,
It all depends on which pistons you have, thereis a high compression one and a low compression one!
The HC will have 6.9cc dish and the LC 12.3 dish. If your engine is from a late car then it is likely to be the HC type.
I confirmed the size of my piston dish by pouring water into it from a cough medicine cup!! not entirely accurate but near enough.
Are you doing a rebiuld or what?
Stormin
Posted: Mon Dec 29, 2003 9:16 pm
by turbominor
Hi Stormin,
thanks for the good answer, shall poor some oil on the piston and see how much i use.
Not rebuilding, just trying to work out the compression ratio when i fit a 1300 head. As turbos and big compression's dont go togeather
Posted: Mon Dec 29, 2003 9:30 pm
by rayofleamington
i once rebuilt a 1098 Van engine - the pistons were heavily dished comapred to the normal ones, so I always thought the low compression ones were easy to spot.
Posted: Tue Dec 30, 2003 1:19 pm
by turbominor
Hi Ray
can you have a look at the picture and see if they look heavily dished to you
( was taken just after the head came off, so things look much better now!!)
Posted: Tue Dec 30, 2003 7:18 pm
by rayofleamington
they look very much like standard pistons.
Posted: Tue Dec 30, 2003 8:47 pm
by turbominor
Cheers Ray
6.9cc it is then, of to visard for some 'a' level maths then.
Will post some pictures of the body shell tomorrow, as she has just been released from the body shop, a covered in 2pack black
Posted: Thu Jan 01, 2004 4:54 pm
by rayofleamington
they certainly look correct. That's quite a find! - (however it doesn't say if they are oversize)
Have the block been overbored? Also - are there any wear ridges at the top of the bores?
If you have notieable wear ridges, it doesn't mean there is a problem - 'A'series engines can keep running happily with ridges up to 1mm but if you change the pistons, the rings may then knock into the ridges causing damage.
Posted: Thu Jan 01, 2004 8:23 pm
by stormin
Hi Iain,
Just looked at the pistons on E bay they are the LC ones they may suit your purpose, I cant remember what Vizard said about CR's for turbo's but you dont want it high for sure.
Sounds like a nice paint job you've had done, I was thinking about Black WHEN I get round to spraying my rebiuld.
Cheers
Stormin
Posted: Fri Jan 02, 2004 9:14 pm
by turbominor
cheers guys, I emailed the chap and they are +20thou, shame as i have a newly honed and rebuilt block.
Worked out I get 9.2:1 with the 12g940. so back to the original head.
Any one want a good unleaded 12g940 let me know!
Posted: Fri Jan 02, 2004 9:47 pm
by rayofleamington
Any one want a good unleaded 12g940 let me know!
yes please
how much?
ps - what bore size is your block?
Posted: Fri Jan 02, 2004 9:49 pm
by turbominor
Hi Ray,
my block was new about 6000 miles ago, so standard size, and has just been honed and had new rings fitted.
Cost me £35, so yours for that, or if you have a working unleaded 1098 as a swap
Posted: Fri Jan 02, 2004 9:56 pm
by rayofleamington
I have a (very) well worn 12G940 that I was going to recon, but for £35 it'll save me plenty.
Sorry - don't have any unleaded standard heads - I had one once but it got sold with the car.
I'll drop my details on a PM
many thanks,
Ray.
Posted: Fri Jan 02, 2004 10:10 pm
by turbominor
cheers ray, look farward to meeting!