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Old 02-21-2013, 10:21 PM   #1
sidewayz
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Default Instead of pinning mains.

Was talking with my machinist and he wants to hollow dowl the mains... Anyone ever do this?
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Old 02-21-2013, 10:44 PM   #2
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That is a valid option. Been working a similar project here for past few months.
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Old 02-21-2013, 10:47 PM   #3
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Think I may take one of our spare blocks and try it.. We were going over how bad a customers motors mains were.. And just looked at me dead set on reaming the holes and shoving hollow dowels in. Hmmmmmm
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Old 02-21-2013, 11:07 PM   #4
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Interested to see how this pans out, good idea to save the block, but how much time added in machining is the question?

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Old 02-22-2013, 12:45 AM   #5
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I recon puting extra dowels in the mains is a wast of time when you already have two major std dowels I can't see the cases walking anywhere
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Old 02-22-2013, 08:06 AM   #6
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Can't see it and don't happen are two different things..


Here is a pic of what we want to do.. He said he does this on VW motors... And welp, here's a VW motor haha

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Old 02-22-2013, 08:23 AM   #7
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Think its a good idea. Most deff worth the try! Id like too see it done...
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Old 02-22-2013, 11:59 AM   #8
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Isn't 3MI Micah a big proponent of this? Isn't that the shuffle pinning he talks about on his big HP builds.
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Old 02-22-2013, 12:28 PM   #9
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They also so the same to Porsches. The funny thing is that the camps on the vw side are divided about whether they help, some citing that decent oil pressure is all you need to sustain rpm. Go figure. I don't see why it wouldn't help. And if you do it please keep us updated.
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Old 02-22-2013, 01:22 PM   #10
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Is that a dowel or a spring pin?
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Old 02-22-2013, 02:58 PM   #11
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Quote:
Originally Posted by dstroy View Post
Is that a dowel or a spring pin?
Looks like a dowel to me.
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Old 02-22-2013, 03:52 PM   #12
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From my layperson's view it would seem easier for a machinist to align up hollow dowels by drilling out already existing main bolt holes than to machine 20 new holes for solid dowels in the two case halves.
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Old 02-22-2013, 05:05 PM   #13
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Any real concerns to why you guys want to dowel the mains? Just curious because Jr did this a while back and since then it has been realized that they aren't necessary, even in 8 sec drag applications.
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Old 02-22-2013, 10:13 PM   #14
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Maybe not in a straight drag application. The unsupported buttresses that make up the tops of the center three mains are asking for it.

That said, our experiences doing shuffle pins are a bit contrary to what others have suggested regarding shortblock assembly; we've found shuffle pinning to make align hone jobs smoother as well as making case half register a breeze.
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Old 02-22-2013, 10:51 PM   #15
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I would like to be able to avoid the $$ involved for pinning and just do the dowels and have good results. Seems a ton cheaper that way
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Old 02-23-2013, 12:35 AM   #16
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Quote:
Originally Posted by sidewayz
Was talking with my machinist and he wants to hollow dowl the mains... Anyone ever do this?
It's what I've been doing for all of my shuffle pinned mains. Turn In Concepts knows this, however they have something really cool brewing as an option that I owe Clint a call about as I've been chewing on it for 24 hours.

-Micah
3MI Racing

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Old 02-23-2013, 12:38 AM   #17
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Quote:
Originally Posted by kellygnsd
Isn't 3MI Micah a big proponent of this? Isn't that the shuffle pinning he talks about on his big HP builds.
Yup, hi!

Sorry to all for the multiple replies. This app is dumb and won't allow multi-quote.
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Old 02-23-2013, 08:47 AM   #18
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So Micah you don't actually use solid pins? You just use dowels in the existing hole?
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Old 02-23-2013, 10:11 AM   #19
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Yup, largely because of the increased surface area. I also machine them to fit over the case bolts.
It's a pretty cheap process, honestly. They are usually only put on my 'premium' sleeved blocks that get pinning, among a few other steps to make a solid foundation.
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Old 02-23-2013, 10:40 AM   #20
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Quote:
Originally Posted by ASF Machine View Post
Maybe not in a straight drag application. The unsupported buttresses that make up the tops of the center three mains are asking for it.

That said, our experiences doing shuffle pins are a bit contrary to what others have suggested regarding shortblock assembly; we've found shuffle pinning to make align hone jobs smoother as well as making case half register a breeze.
That makes a ton of sense.
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Old 02-23-2013, 01:54 PM   #21
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In for learning from the big dogs.
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Old 02-24-2013, 02:40 AM   #22
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I have two blocks in use with dowelled mains. One with hollow dowels in reamed out main bolt holes and another with new holes drilled for solid dowels. Only have a pic of the latter but both blocks are working well fwiw

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Old 02-25-2013, 10:43 PM   #23
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I use hollow pins over the mains for all of mine.
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Old 02-25-2013, 10:55 PM   #24
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where can one buy these hollow pins?

I'm assuming any decent machine shop could do this service?
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Old 02-25-2013, 10:55 PM   #25
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where can one buy these hollow pins?

I'm assuming any decent machine shop could do this service?
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