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Location:
Castle Hill NSW
Registered:
March 2003
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What does "X Bolt Mains" mean?
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Mon, 30 May 2005 03:48
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What does "2 or 4 or 6 Bolt Mains" mean?
I've been curious for AGES and can't find out!
I'm sure its a silly question, but nonetheless.
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Toymods Vice President
Location:
Sydney
Registered:
May 2002
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Location:
Castle Hill NSW
Registered:
March 2003
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Re: What does "X Bolt Mains" mean?
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Mon, 30 May 2005 04:12
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Oh, is that all ? The number of bolts that hold the cap that holds the bearing that holds the crankshaft?
So why is it such a big deal that the 1uz has 6 of them, when american v8's have 2 ?
Isn't that just pointless overkill, or do they *really* fail occasionally and let go of the cap?
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: What does "X Bolt Mains" mean?
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Mon, 30 May 2005 04:15
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Anything alloy and powerful would self destruct with less than 6 bolt mains.
Cast Iron tends to be a tad stronger so 2 bolts is enough.
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: What does "X Bolt Mains" mean?
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Mon, 30 May 2005 05:43
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| CrUZsida wrote on Mon, 30 May 2005 12:15 |
Anything alloy and powerful would self destruct with less than 6 bolt mains.
Cast Iron tends to be a tad stronger so 2 bolts is enough.
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That and Toyota went a bit nutso on the 1UZ 
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Location:
Newcastle
Registered:
April 2003
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Re: What does "X Bolt Mains" mean?
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Mon, 30 May 2005 06:09
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And the bolts that come in from the sump give it a bit more strenght in the block as they are all tied together.
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Location:
Castle Hill NSW
Registered:
March 2003
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Re: What does "X Bolt Mains" mean?
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Mon, 30 May 2005 06:38
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Ok thanks for the explanations.
On a sidenote, using a 1uz in a boat would be a bad thing, right, wouldn't the alloy rust away in no time, since to cool boat engines you pump river water through the water cooled headers and then straight through the block.
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Location:
Campbelltown
Registered:
November 2003
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Re: What does "X Bolt Mains" mean?
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Mon, 30 May 2005 06:39
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alloy won't rust. cast iron will though
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Location:
Castle Hill NSW
Registered:
March 2003
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Re: What does "X Bolt Mains" mean?
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Mon, 30 May 2005 06:49
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Really? I always heard that you couldn't put alloy heads on boat v8's because they'd rust away in no time. ??
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: What does "X Bolt Mains" mean?
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Mon, 30 May 2005 06:50
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Plenty of people are now using the 1UZ in Marine applications.
Toyota actually developed a Marine 1UZ.
How they do it, I don't know as I haven't looked.
But nothing seems to happen to aluminium dinghies does it?
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Location:
Brisbane
Registered:
October 2002
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Re: What does "X Bolt Mains" mean?
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Tue, 31 May 2005 09:03
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toyota seem to have a very high quality alloy compared to some companies {ford for example}{as i have found anyway}
u can also get 4 bolt splayed mains on your ford and chev motors, what that means that u have 2 main bolts that run vertical and 2 that run at about a 30 deg angle, stops the caps from walking
look here
http://www.worldcastings.com/docs/05_cat_pg8.pdf
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Location:
Melbourne
Registered:
June 2004
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Re: What does "X Bolt Mains" mean?
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Thu, 02 June 2005 09:42
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I think 4 and 6-bolt mains are common in Alloy-block engines because aluminium alloys are a lot softer than Cast Iron, and far more prone to thermal expansion.
Both bad things when you're trying to locate crankshaft bearings accurately.
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Toymods Vice President
Location:
Sydney
Registered:
May 2002
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Re: What does "X Bolt Mains" mean?
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Fri, 03 June 2005 01:20
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| chrishulbert wrote on Mon, 30 May 2005 16:49 |
Really? I always heard that you couldn't put alloy heads on boat v8's because they'd rust away in no time. ??
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That's because you're thinking about putting alloy heads on an iron block. This ends up with dielectric corosion of. If the whole water path is alloy or you add something like a magnesium sacraficial anode I see no reason for corrosion problems.
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Location:
c'town, NSW
Registered:
May 2002
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Re: What does "X Bolt Mains" mean?
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Fri, 03 June 2005 01:26
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or u run the cooling system on a internal circuit with coolant and only have the radiator exposed to the river water.
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Location:
Melbourne
Registered:
June 2004
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Re: What does "X Bolt Mains" mean?
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Fri, 03 June 2005 06:04
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| Joshstix wrote on Fri, 03 June 2005 11:20 |
| chrishulbert wrote on Mon, 30 May 2005 16:49 |
Really? I always heard that you couldn't put alloy heads on boat v8's because they'd rust away in no time. ??
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That's because you're thinking about putting alloy heads on an iron block. This ends up with dielectric corosion of. If the whole water path is alloy or you add something like a magnesium sacraficial anode I see no reason for corrosion problems.
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There's a certain combination you can't install copper gaskets in (mainly head-gaskets I think) as it corrodes aluminium very badly in some circumstances. I think it may be iron block / alloy head(s) . . 
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