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joewest · Joined: 06 Oct 2005 Posts: 234 Location: Portland, OR

Hey Gents,

Does anyone have the dimension of the crushed thickness of the stock sized Victor-Reinz composite head gasket?

I am doing displacement calcs on my engine as I prepare to add an M62 and am considering not using the Cometic sitting on my shelf that crushes down to .051" due to the state of the block's deck surface roughness and high estimated CR.

Thanks!
_________________
'79 924 Supercharged / Track Prepared
'80 931 Daily Driver - Sold
"The number of posts in my profile may represent the number of times I have screwed something up...and admitted it here."

safe · Joined: 18 Mar 2017 Posts: 708 Location: Sweden

I'm in the thought process of something similar.

I have no clue about the crushed height, but the stock gasket is 1.7 mm and according to some calculations I did a 1 mm of change adds/removes about 0.7 to the compression.

If it compresses a couple of tenths or not it doesn't really affect the compression that much...

poor-sche · Joined: 06 Jan 2017 Posts: 80 Location: Los Angeles, CA

See if this helps...

http://garage.ideola.com/top-DL-CompressionRatioCalc.html

It's a link to a compression ratio calculator on Ideola's old site that still works; well at least for now.
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1980 - 931

joewest · Joined: 06 Oct 2005 Posts: 234 Location: Portland, OR

safe · Joined: 18 Mar 2017 Posts: 708 Location: Sweden

joewest · Joined: 06 Oct 2005 Posts: 234 Location: Portland, OR

I am using a Weber/Redline 60mm assembly. It was a direct bolt-on with no mods to the intake manifold. Also, the inlet accommodates a 3" diameter ROUND hose which is readily available.
_________________
'79 924 Supercharged / Track Prepared
'80 931 Daily Driver - Sold
"The number of posts in my profile may represent the number of times I have screwed something up...and admitted it here."

MikeJinCO · Posted: Fri Dec 21, 2018 11:45 pm Post subject:

My actual figures are at home and I'm in Mexico, but as I recall I found quite a bit of variation across the crushed head gasket but if i recall correctly the thickness was in the range of .056 to .062 and I used about .060 for the average. Hope this helps.
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Mike

'67 MG Midget Dp
'71 Ocelot Dsr Kawasaki 1000(under rebuild)

safe · Joined: 18 Mar 2017 Posts: 708 Location: Sweden

joewest · Joined: 06 Oct 2005 Posts: 234 Location: Portland, OR

Thanks for the feedback gents.

I installed a gasket, torqued it down and then took the head off and measured the gasket again (at the fire rings, each cylinder bore, each quadrant). Cold motor, reused factory bolts, dry, torqued to specs.

Part Description: Victor-Reinz 93110433706 Head Gasket

Out of the box:
Height = 2.0mm (0.078")
Bore Diameter = 89.2mm (3.512")

Installed and Removed:
Height = 1.98mm (0.078")
Bore Diameter = 89.2mm (3.512")

These tolerances are beyond my concern with this build, so I am using 2mm, with a bore of 89.2mm yielding 12.5cc static per cylinder. That delta in height is only about 0.1cc which is not a concern for me.
_________________
'79 924 Supercharged / Track Prepared
'80 931 Daily Driver - Sold
"The number of posts in my profile may represent the number of times I have screwed something up...and admitted it here."

joewest · Joined: 06 Oct 2005 Posts: 234 Location: Portland, OR

There is a Weber/Redline TB on ebay now....

https://www.ebay.com/itm/60cfl-Performance-Weber-Throttle-Body-Redline-VW-Type-3-4-Volkswagen-Manifold/283272310411?epid=21026189687&hash=item41f4586e8b:g:ufYAAOSwQZdb9LhH:rk:1:pf:1&frcectupt=true
_________________
'79 924 Supercharged / Track Prepared
'80 931 Daily Driver - Sold
"The number of posts in my profile may represent the number of times I have screwed something up...and admitted it here."