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Gtir Motorsport club » Tech room » Help and Advice » Advice on crankshaft regrinds

Advice on crankshaft regrinds

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1 Advice on crankshaft regrinds on 5th May 2015, 8:03 pm

Spark plug spike

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I have had a crankshaft in the engineers with marks on the main journals and a spun rod bearing and he said after a .25 grind it still had marks so he has ground it to .50 on both the mains and the bigend journals?

Question is can you get .50 bearings for the GTiR as I'm struggling to find any?

Will there be any downside to grinding the crank to .50?

All advice welcome cheers

2 Re: Advice on crankshaft regrinds on 5th May 2015, 10:54 pm

GTI-R US

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Main bearings will be fine with a .50 grind as bearings are under no real loading as such unlike bigend bearings

The nitrided surface on most of these cranks goes to around .25 to .30 so once ground beyond that you will lose the hardened surface.
Personaly I would not use a crank ground to .50 on bigend journals unless it was a naturally aspirated engine with a linear loading.

Tried this once before on a close to 350bhp car and it did not last to long, I've seen a few failures on cranks ground beyond the .25 so if I'm honest it's a risky game your playing there spike


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3 Re: Advice on crankshaft regrinds on 6th May 2015, 6:42 am

Spark plug spike

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Cheers for that Bob, I think I will scrap it then

Do you have any good standard size cranks in stock???

4 Re: Advice on crankshaft regrinds on 6th May 2015, 12:35 pm

Mr B

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gtir technician
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Why is machinist grinding crank when not even seen bearing options.
My machinist won't grind till got set of bearing & does a install of bearings in block & uses bore gauge to measure bearing bore as a first step to spec his grind measurements, doing that & measuring to 3 decimal places helps get clearance in far better ranges.
decent used or new crank would be good, new is about 650GBP if you smile but someone friendly with Nissan parts might get that lower. .25 grinds are no bother but get someone real good to do it.

5 Re: Advice on crankshaft regrinds on 6th May 2015, 8:45 pm

johnny gtir

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What's the crank part number for nissan ?

6 Re: Advice on crankshaft regrinds on 6th May 2015, 8:56 pm

Stu

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Think its more like £800 for a new crank from nissan isnt it?


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7 Re: Advice on crankshaft regrinds on 6th May 2015, 9:11 pm

Mr B

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Crankshaft part# is 1220054C05
£800 is worse case scenario without a friendly parts man. Got a few people on here working at Nissan or with friendly parts source that should be able help on prices on chunky purchases like this.

8 Re: Advice on crankshaft regrinds on 6th May 2015, 10:08 pm

johnny gtir

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I will see what price I can get thanks

9 Re: Advice on crankshaft regrinds on 6th May 2015, 10:24 pm

nomad

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They was like £850  two years  ago ... make that 3 years ago from a post i found ...


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10 Re: Advice on crankshaft regrinds on 6th May 2015, 10:32 pm

Mr B

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I've had under 700 & reckon someone with good contacts will get under 600.
Nissan pile it on, markup is immense. Don't help in UK with current vat rate though :-S
Elections tomorrow gents so early night & up early ready for the poll booths haha ...

11 Re: Advice on crankshaft regrinds on 6th May 2015, 10:48 pm

nomad

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Well lets see what mr beeb can come up with seeing as hes a mr nissan man now ... how long ago did you get those prices b? ...we have 20% over here ... Rolling Eyes


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12 Re: Advice on crankshaft regrinds on 7th May 2015, 9:37 am

Mr B

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^ Was some time ago, I always try various nissan dealers & other suppliers & see what results get then work on couple of best prices & see if get down more, prices vary a lot from dealers as some will automatically add trade discounts etc at different rates while other stiff you with blatant robbery.
Also depends on stock, if Nissan UK/Europe do have some floating about they may be keen shift them & lower price, if got go on order from Japan then probably less flex in the pricing :-/
20%vat is just crazy on stuff like this, car parts, building material, tools etc should be in a lower bracket :-/

13 Re: Advice on crankshaft regrinds on 7th May 2015, 1:13 pm

shroom

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Mr B wrote:Elections tomorrow gents so early night & up early ready for the poll booths haha  ...

Its not too bad I can get paid £160 (plus my normal day rate) for working on the polling station.

14 Re: Advice on crankshaft regrinds on 7th May 2015, 1:38 pm

Mr B

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gtir technician
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^ what's the predictions on this election .
Are labour being forgiven for the EU mess & dodgy expenses book keeping of the Blair & Brown days .
Sounds like mr shroom doing ok :-) how does one get involved on polling station work ?

15 Re: Advice on crankshaft regrinds on 7th May 2015, 2:35 pm

Supernova


My prediction is it will be the lowest turnout yet. I can't really say i've met or spoke to anybody that actually cares.

Self serving, lying cheating thieves.

Lol sorry wrong website.

16 Re: Advice on crankshaft regrinds on 7th May 2015, 3:11 pm

Mr B

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gtir technician
gtir technician
Come to thailand if you want see proper lying cheating thieves, Our last government funded armed militants to back it & throw grenades & automatic weapon fire about when things don't go their way.
At least you didn't get the Euro currency Blair so badly wanted, A crankshaft would cost a lot more if you had pay in worthless Euro lol :-D

17 Re: Advice on crankshaft regrinds on 7th May 2015, 5:35 pm

shroom

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I havent done it personally I work for the local council IT and they were emailing arounf for poling clerks to help out and that was what they would pay use for the day although it is 7am to 10pm but all you do is stand there and smile.

We just have the welsh and scotish crying poverty and its going to be nice and fragmented with no real winner and some dodgy coalition were they can then just go back on all their promises and do what they want lol.

As you said we should count ourselves lucky as some places are a whole lot worse!

18 Re: Advice on crankshaft regrinds on 7th May 2015, 7:03 pm

johnny gtir

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Anyone got Chasis number ?

19 Re: Advice on crankshaft regrinds on 7th May 2015, 7:28 pm

Mr B

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gtir technician
gtir technician
just give them bobs uk sunny reg number.

no idea why they need it all models same crank, got be a uk nissan parts counter I guess :-)

20 Re: Advice on crankshaft regrinds on 7th May 2015, 7:36 pm

nomad

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Majority of them have some kind of attitude and then when you mention import christ its like you have just said ive shagged ya mum lol


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21 Re: Advice on crankshaft regrinds on 7th May 2015, 7:59 pm

Mr B

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gtir technician
gtir technician
^ lol . do you not get better prices if you shag his mum hump

22 Re: Advice on crankshaft regrinds on 7th May 2015, 8:01 pm

johnny gtir

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Ha ha to true my local one is good but this is a friend of a friend who can supposedly get discount but his first question was reg and Chasis number lol

23 Re: Advice on crankshaft regrinds on 7th May 2015, 9:46 pm

nomad

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I dont know b but id give it a go if i got a bloody good discount .... Wink


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24 Re: Advice on crankshaft regrinds on 7th May 2015, 10:29 pm

Mr B

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gtir technician
gtir technician
^ okay be on standby, keep it rested. Basketball
Proper dedicated club member thumbsup

25 Re: Advice on crankshaft regrinds on 12th May 2015, 10:35 am

johnny gtir

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762.60 no discount with special order items can anyone beat this ?

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