[DeTomaso] Speaking of (crankshafts)

[Thomas Tornblom]

2012-02-29 06:34, Ken Green skrev:
> Guys,
>
>      Dies the crank have to be flat for a12 cylinder boxer?  Can you have 3 flat 4's 120 degrees apart and is it still a flat crank if the throws for each of the 4s are flat?

Here's a snippet from the document you linked to:

---
For example, a 12-cylinder engine can be flat but it will use a crank 
where the crank pins are spaced 60º.
---

I think this is incorrect for a V-engine though, the spacing is normally 
120°. You can think of a V12 as two straight sixes sharing a single 
crank. The crank will look like a straight six crank.

For a true 12 cylinder boxer the pins would be spaced 60° apart.


>
>      Here is a "flat" 180 deg V12:
>
> http://www.aircoolednut.com/erkson/personal/ferrari_boxer_flat_crank.htm
>
> Ken
>
> From: "JDeRyke at aol.com"<JDeRyke at aol.com>
> To: cuvee at sbcglobal.net
> Cc: detomaso at realbig.com
> Sent: Tuesday, February 28, 2012 8:45 PM
> Subject: Re: [DeTomaso] Speaking of (crankshafts)
>
>
> In a message dated 2/28/12 5:59:30 PM, cuvee at sbcglobal.net writes:
>
>
>> What the difference between a Flat Crank and a Reg. Crank?
>>
>
> All the rod throws are either at 0 or 180 degrees so when laying on a
> bench, the crank is flat. In a conventional crank, some throws are at 90 degrees.
> Cheers- J Deryke
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