Guys,

 

I posted a while back about dropping the sump with engine in situ to investigate a big end knock on pot 6, which I have now done ( actually very easy to do - hardest part was physically getting the sump off with all the silicon gluing it on!)

 

So, I find that the big ends have been replaced with ACL bearings dated 2007 - I owned the car from about 2008 onwards and it's done probably less than a mile in all that time (embarrassing I know!) as I slowly work through all the issues on her... In other words I suspect it has the problem before and has been poorly repaired previously.

 

1 to 5 seem fine, but with a little end float (didn't check if it's in spec as it was all coming apart)

 

6 has a obviously been running hot and has a big score in the bearing shells and a visible and tactile-to-the-finger-nail score in the crank.. The score lines up with the oilwaythat is cross bored into the crank ( is this a standard feature or has it been modified?) I'm thinking that burrs on the edge of the oilway hole has caused the scoring, or a piece of debris has come through the hole and into the bearing...

 

Anyway... I'm after some advice on my options...

 

1) try to polish out score in crank, fit new bearings and live with it for a year or so during which time I'll build up a high power replacement lump to drop in..

2) drop crank out and send it away for regrinding

3 fit an na crank that I have in a (currently complete and was healthy on removal) na engine... I believe they are the same cranks

 

I'm desperate to get the car onto the road, so time is a factor in all this...

 

If I didn't love the car so much, I would have given up many many months ago...???

 

So what to do?

 

Thanks in advance guys!

 

M

Can't help with the answers to your questions mate. it's beyond my knowledge, I'm afraid. I do wish you the best of luck with it as I know how frustrating they can be...

 

 

oh, and free bump as I'm sure our engine experts will be able to help you..:)

Cheers Steams!

buy my car... take engine out, put new turbos on it, put it in yours and break / sell whatever is left....

Get the motor out and on a stand to find out why number 6 has destroyed...could be oil way blocked in crank/block plus you can check the mains at the same time:winkiss:

I was thinking just the same, it sounds like the symptom has been treated without rectifying the cause. I can see you wasting money here by simply replacing the crank or bearings. Source a known Goodun, that can tide you through while the other block is stripped inspected machined cleaned and rebuilt.

:)