Printable Version | Subscribe | Add to Favourites
New Topic New Poll New Reply
Author: Subject: Duratec Bore Score
Furyous

posted on 10/6/17 at 04:20 AM Reply With Quote
Duratec Bore Score

It seems like the more I look at my engine, the worse it gets.

I've taken the head off and it looks like something has got into one of the cylinders, possibly something small has broken off the piston. The cylinder wall has some scoring.

This is the worst one. It easily catches my fingernail.

Description
Description



These aren't as deep but I can feel them when I run my finger over them.

Description
Description




Is there anything I can do to save this? Or would it be easier to get a new engine?

View User's Profile View All Posts By User U2U Member
snapper

posted on 10/6/17 at 05:47 AM Reply With Quote
It looks as if it's been stored dry and fired up with little lubrication.
There are not a lot of options but a heavy deglaze and new rings may save the day but you will need to properly gap the rings and take the sharp edge off the ring gap outer edge to stop it cutting on installation and first fire up.
Cleaning the bores of metal filings and hone stone dust needs to be thorough.

Did you do a compression test before stripping the engine? Was it burning oil?
I usually leave an engine alone if it's not burning oil and compression is even





I eat to survive
I drink to forget
I breath to wee my ex wife off (and now my ex partner)

View User's Profile View All Posts By User U2U Member
Furyous

posted on 10/6/17 at 09:37 AM Reply With Quote
I did a track day in March but had to stop early because the engine was knocking. The con rod bearings were destroyed due to what looked like oil starvation. Two of them were so bad that they did some damage to the conrods. I took the head off to swap them out and found this. There's a little chip on the piston crown roughly in line with the deep score, although I can't tell if the chip was caused by some debris or if the chip was the cause of the scoring.

Might be easier to just buy another engine the way this is going. Trouble is, the 2.0 Duratec is usually around $2-3,000 or the 2.3 Mazda is $1,200+.

View User's Profile View All Posts By User U2U Member
Dick

posted on 10/6/17 at 09:56 AM Reply With Quote
We see this a few times on zetecs and duratec engines plus others and find the most common cause is due to poor maintenance procedures. People remove spark plugs without taking basic care you must always remove all crap from around the plugs be for removal. Do not just undo them as any rubbish just falls in the hole.
View User's Profile View All Posts By User U2U Member
mcramsay

posted on 10/6/17 at 12:15 PM Reply With Quote
I think in this case the damage to the conrods / bearings etc is more likely to blame rather than something falling in when you removed the spark plugs.
View User's Profile View All Posts By User U2U Member
Dick

posted on 10/6/17 at 12:55 PM Reply With Quote
If the rings are still in one piece then damage to piston top indicates that it entered into the combustion chamber from above
View User's Profile View All Posts By User U2U Member
Hornet

posted on 11/6/17 at 09:04 AM Reply With Quote
I had exact same scoring and honed for ages, gapped rings.... total waste of time. Wasted time and money! Better to get a new engine. A good engine here in U.K. Is approx 400 to 600. I wonder if it would be worthwhile looking at shipping costs?
View User's Profile E-Mail User View All Posts By User U2U Member
Furyous

posted on 12/6/17 at 10:58 PM Reply With Quote
The sister in law bought a Mondeo last week. I wonder if she'd notice if I swapped the engines...

(Side note - her engine wasn't running right so she took it to a garage who charged $500 (250) for 6 spark plugs and HT leads! That didn't even sort the problem! It turned out to be the coil pack, which I had a spare sitting in my garage... along with a spare set of spark plugs. I was pretty miffed they didn't talk to me first)

There's a 2.3 Mazda engine nearby for about 250, which I'm tempted to buy. I can't seem to find a lot of detail about tuning/power options, though. Everything I can see is a bit vague or about the 2.0.

From what I gather, the block and head ate identical but the extra height is in the cam cover from the vvt. What are the chances I could just use the solid cams from the 2.0?

What kind of power could I expect from the 2.3 with GSXR1000 throttle bodies?

View User's Profile View All Posts By User U2U Member

New Topic New Poll New Reply


go to top






Website design and SEO by Studio Montage

All content 2001-16 LocostBuilders. Reproduction prohibited
Opinions expressed in public posts are those of the author and do not necessarily represent
the views of other users or any member of the LocostBuilders team.
Running XMB 1.8 Partagium [ 2002 XMB Group] on Apache under CentOS Linux
Founded, built and operated by ChrisW.