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engine bearing clearances

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73GT

Post subject: engine bearing clearances

Posted: Thu Mar 08, 2007 6:39 am

848cc

Joined: Thu Feb 08, 2007 9:35 am
Posts: 96
Location: NZ

Hi

I am currently get a crank machined.
Does anyone know what the thickness of a main & big end shells are.
I need to know this so i can determine bearing clearances.
I will measure the main & big end bores
Also Vizard mentions going 0.001" under bottom size to provide extra clearance in competition engines, is this what others do?

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1275

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73GT

Post subject:

Posted: Thu Mar 08, 2007 6:41 am

848cc

Joined: Thu Feb 08, 2007 9:35 am
Posts: 96
Location: NZ

ps
it is a large journal 1275 motor

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justminis

Post subject: Re: engine bearing clearances

Posted: Thu Mar 08, 2007 7:26 am

998cc

Joined: Fri Mar 26, 2004 8:44 pm
Posts: 1084
Location: Far North Queensland

73GT wrote:

Hi

Also Vizard mentions going 0.001" under bottom size to provide extra clearance in competition engines, is this what others do?

No. just grind it the minimum it needs and then use plastiguage to determine your running clearance.

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Steve

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73GT

Post subject:

Posted: Thu Mar 08, 2007 9:31 am

848cc

Joined: Thu Feb 08, 2007 9:35 am
Posts: 96
Location: NZ

i mentioned to the reconditioner that i had already used plastigage & he said it isnt exact enough & prefers to measure actual bore & journal sizes.
As i have a micrometer it is no problem to do this
I just dont know how to get the shell thichness

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DOZ

Post subject:

Posted: Thu Mar 08, 2007 9:48 am

1098cc

Joined: Fri Jan 14, 2005 9:08 pm
Posts: 1683
Location: Bris Vegas Occupation: Engineer

The crank grinder can tell you what undersize the crank needs to be ground to, they are the bearings you need to buy.

Instal the bearings and measure the I.D. in a few places, the crank can then be clearanced to suit.

Regards

Daniel

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mini-dunger

Post subject:

Posted: Wed Dec 19, 2007 4:04 am

1275cc

Joined: Thu Jun 08, 2006 9:34 pm
Posts: 2372
Location: Adelaide

I was also wondering what the main and conrod bearing tollerances are? I am going to tighten em up with plastiguage today.

thanks

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blokeinamoke wrote:

Yep Mokes are ugly - but Moke owners know that. Its like ugly women - she may be a dog but you know your going to get some :wink:

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cush

Post subject:

Posted: Wed Dec 19, 2007 4:18 am

THIS SPACE FOR RENT

Joined: Wed Jun 09, 2004 3:35 pm
Posts: 11847

they'd be in the workshop manual specs pages...

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smac

Post subject:

Posted: Wed Dec 19, 2007 4:54 am

1098cc

Joined: Fri Aug 26, 2005 1:03 pm
Posts: 1540
Location: Napier, NZ

If the guy doing the grind is asking you what the clearances should be, use another guy :shock:

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cush

Post subject:

Posted: Wed Dec 19, 2007 5:19 am

THIS SPACE FOR RENT

Joined: Wed Jun 09, 2004 3:35 pm
Posts: 11847

unless he's asking for his preference...

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mini-dunger

Post subject:

Posted: Wed Dec 19, 2007 11:27 am

1275cc

Joined: Thu Jun 08, 2006 9:34 pm
Posts: 2372
Location: Adelaide

I just need a rough idea so I know what colour plastiguage to buy

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blokeinamoke wrote:

Yep Mokes are ugly - but Moke owners know that. Its like ugly women - she may be a dog but you know your going to get some :wink:

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mini-dunger

Post subject:

Posted: Wed Dec 19, 2007 2:24 pm

1275cc

Joined: Thu Jun 08, 2006 9:34 pm
Posts: 2372
Location: Adelaide

min .25 thou Max 1 thou

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blokeinamoke wrote:

Yep Mokes are ugly - but Moke owners know that. Its like ugly women - she may be a dog but you know your going to get some :wink:

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