Head decking: How much do I remove to get 11:1 c/r

[amalventano1@comcast.net (Allyn)]

with that block/head and 10:1 comp your chamber space is 55.12 cc's.
for 11:1 you need 49.61 cc's, so you need a diff of 5.51 cc's
aba block bore area (82.5mm) equates to 53.45 cm^2
5.51 cc/53.45 cm^2 = 0.1031 cm = 1.031 mm = 0.0406 inches shaved

if the numbers you gave us were inches, that .04 is going to exceed the
minimum spec (~5.20)

- i believe that the minimum spec is for the timing belt tensioner to work
properly. you have to change the tensioner location if you go below the
5.219 number (belt will be too slack, even at the tensioners 'max'
position).

Al

Allyn Malventano, ETC(SS), USN
87 Rieger GTO Scirocco 16v (daily driver, 170k, rocco #6)
86 Kamei Twin 16V Turbo Scirocco GTX ('it has begun', rocco #7)
87 Jetta 8v Wolfsburg 2dr (daily driver, 260k, 0 rattles, original clutch,
driveshafts, wheels :)

----- Original Message -----
From: "Mardak" <maardak@yahoo.ca>
To: <scirocco-l@scirocco.org>
Sent: Sunday, May 26, 2002 3:55 PM
Subject: Head decking: How much do I remove to get 11:1 c/r


> I've got a JH head going on an 2.0 ABA block.  The head measures 5.240
> from deck to valve cover mating surface.  Bentley minimum measurement
> is 5.219, so I'm fine there...  From what I've read, the ABA/JH
> combination yields a 10:1 comp. ratio.  So, based on these numbers,
> does anyone have a recommendation on how much to remove without cc'ing
> the head?
>
> Thanks,
>
> Mark.
>
>
>
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