Date: Sun, 25 Sep 2011 23:43:41 -0700
Reply-To: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Subject: Re: Question and parts request.
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on the other hand VW stretch bolts are quite inexpensive.
- Ten head bolts for a VW diesel for as low as $ 1.50 each.
come to think of it ..on a 1.9 diesel the spec is so many ft lbs..
then two 90 degree turns.
I can seldom get that second full 90 degree twist ..it sure seems like
something is going to break or strip or give.
I have bolts sitting by a blown engine I have ........
one of these days I'm going to put head bolts in that block and just turn
and twist on those bolts until they are either very fully turned to where
they belong,
or something gives.
On those it's scary feeling sometimes.
Feels like you're putting 200 ft lbs on them ..like something has to give.
Scott
----- Original Message -----
From: "John Rodgers" <inua@charter.net>
To: "Scott Daniel - Turbovans" <scottdaniel@TURBOVANS.COM>
Cc: <vanagon@GERRY.VANAGON.COM>
Sent: Sunday, September 25, 2011 11:07 PM
Subject: Re: Question and parts request.
> Turbine engines have pretty much taken oven in the aviation world, but
> there a lot of radial engines out there still. An interesting thing about
> radial engines. If it's a single bank or row of cylinders, there is only
> one crank throw - doesn't matter if it's a 5 cylinder, 7 cylinder or 9
> cylinder engine - one crank throw. So how do they get 9 cylinders onto a
> single crank throw. That is the question. Well, they do it with a Master
> Rod. A single rod that has a bunch of holes in it to which all the other
> rods attach. The only rod to travel in a perfect circle is the master rod.
> The rest, because of the way they attach, the rod end travels in an
> ellipse. What is really interesting is the master rod is held on there
> with stretch bolts. In some cases the cranks shaft is two part and a clamp
> holds them together - but again - it's stretch bolts that hold the clamp
> tight. They are high torque, one time only use. If you over torque , you
> have wasted a whole lot of money because those puppies cost dearly.
> Stretch bolts to me were always kind of scarey, but the engineers put them
> in all kinds of places and claim they are good.
>
> John
>
>
> John Rodgers
> Clayartist and Moldmaker
> 88'GL VW Bus Driver
> Chelsea, AL
> Http://www.moldhaus.com
>
>
> On 9/25/2011 10:20 PM, Scott Daniel - Turbovans wrote:
>> there's a stretch bolt holding the timing belt
>> sprocket onto the flat noise of the crankshaft ( very dumb design I
>> think..........no, I know.......because I've seen it screw up ..
>
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