G60 swap questions

[jdbubb at verizon.net (Dan Bubb)]

Cory,
Can I ask where you got your numbers?
For instance 92mm is not a stock stroke, 86.4 (1.8L) or 92.8 (2.0L) are.
Also, curious how you calculated CR. Did you actually measure the piston dish volume?
Typically, aftermarket piston manufacturers take into account the increase in bore size and displacement and adjust the dish volume to attain the CR they desire for the piston.
Also, David relative to your comment on CR while using a diesel crank, that would depend entirely on the piston design and dish volume since it would be a custom piston. i.e you cannot use any stock piston with a diesel crank and get correct deck height.
Dan



From: "Cory Langford" <Cory_Langford@bcit.ca>
Sent: Thursday, January 26, 2006 1:43 PM


> Well,  I wouldn't really follow what I am doing as I may end up blowing 
> the engine all the h*ll as I am no real expert here I am just learning and 
> winging it as I go :)
> 
> I got VERY lucky.  I managed to pick up an old project dirt cheap (Local 
> VW nut passed away and we were lucky.  His family practically donated all 
> his stuff to various us vw nuts that usually hung around his garage; to 
> keep his love for the vw going.)
> 
> My base is kind of an known.  It is a pg block overbored. The piston set 
> is 83mm and they are forged. I am not sure if they are JE, but I used 
> their specs figuring most other brands should be close.  The stroke should 
> be 92mm (I still have to verify this) the rods are unknown - possibly 
> custom.  That should make a "rounded up" 2L  (1990 aprox I figured).
> 
> As for compression ratio, I figured with the dished pistons I should be 
> close to 10:1 (10.6 was what the calculator spit out, if the stroke is 
> actually 92) A little high, but not impossible.  I know of a whole lot of 
> 16V turbos running close to 10:1 compression.  I just have to keep 
> detonation problems under control (I figured use of high octane gas and a 
> water injection system should do the trick)
> 
> But like I said, I am no expert.  I could get the whole thing together, 
> have fun for a few months and end up with a smoldering block of scrap in 
> the engine bay :)
> 
> 
> Cory Langford
> '86 Roc turbo, 
> '78 Roc turbo - Daily driver project,
> '65 Ghia Coupe
> 95 Eurovan, etc, etc... :)
> 
> 
> 
> "David Utley" <fahrvergnugen@cox.net> 
> Jan 25, 2006 07:27 PM
> 
> To
> "Gordy Stedman" <ydrogs@gmail.com>, "Cory Langford" 
> <Cory_Langford@bcit.ca>
> cc
> <Scirocco-l@scirocco.org>
> Subject
> Re: G60 swap questions
> 
> 
> 
> 
> 
> 
> Cory,
>  What pistons are you planning on using?  I wanted to do a 2.0 G60 and
> decided that stock was the best idea I could come up with.  The G60 
> pistons
> (as you know) have a larger distance from the top of the crown to the top
> ringland, greater than any other I have ever seen.  I think VW did this
> because this helps keep the pressure away from the rings.  A friend who
> sells Eurospec mentioned this, and the fact that he had sold 3 2.0 G60
> S/Blocks from them, and ALL THREE FAILED.  Apparently, they only appeared 
> to
> be ABA-type S/Bs with no other perparation to make them stand up to the
> pressure...
> 
> Back to the pointed questions.  :-)  I know that some are using a TDI 
> crank,
> but what compression ratio will that raise it to?  Are you going to use a
> stock headgakset?
> 
> Sorry to have so many Qs, you are posting this right when I was searching
> for these answers...
> 
> TIA,
>  David
> 
> 
> 
> 
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