Author Topic: one hole vs two hole head gasket ? (Read 3847 times)

giulianot · « **on:** December 06, 2007, 07:47:20 am »

How much of a drop in compression would i see if i put a two hole head gastket in the place of a one hole headgasket? The difference is only .04 mm but what does that equate to in drop in compression? Is the difference so little that i wont even notice it on cold starts? anyone done this before?

jimfoo · « **Reply #1 on:** December 06, 2007, 08:08:06 am »

I really doubt you'd notice anything at all.

jtanguay · « **Reply #2 on:** December 06, 2007, 09:26:01 am »

if it got really cold you might notice it a little. otherwise you won't notice it at all above 0 deg C unless you have bad compression.

shegel · « **Reply #3 on:** December 06, 2007, 09:44:28 am »

if you had a td then could you run the thicker gasket and then up the boost/fuel

jtanguay · « **Reply #4 on:** December 06, 2007, 10:06:11 am »

Quote from: "shegel"

if you had a td then could you run the thicker gasket and then up the boost/fuel

but this won't really help those subzero cold starts... great for a summer hot rod though :twisted:

shegel · « **Reply #5 on:** December 06, 2007, 10:58:04 am »

it doesnt get that cold here though....is it comparable to the compression loss that results from using the 1.9 head on the 1.6 block

giulianot · « **Reply #6 on:** December 06, 2007, 11:35:32 am »

Up here in the great white north we see temps as low as -30 deg c , my application is on a 1.9 aaz the old gasket after 300 km use :roll: here are some pics of my burnt one hole headgasket. :x

jimfoo · « **Reply #7 on:** December 06, 2007, 11:37:28 am »

Are 1 holes just not available? You could always get the block skimmed a little for the 2 hole.

giulianot · « **Reply #8 on:** December 06, 2007, 12:05:50 pm »

Auto-camping only has 2 hole victor rienz in stock and 1 hole elna head gasket. I've never heard of elna, are they a reputable manufacturer? I wanted to use a 2 hole gasket thinking that it might eliminate haed gasket failure under high boost. Is thinking correct?

jimfoo · « **Reply #9 on:** December 06, 2007, 02:11:25 pm »

Looking for other stuff and happened to see a Reinz 1 hole. http://www.thepartsbin.com/catalog/products.php?year=1997&make_text=volkswagen&model_text=passat&category=engine_mechanical&subcategory=cylinder_head

jtanguay · « **Reply #10 on:** December 06, 2007, 09:29:05 pm »

Quote from: "giulianot"

Auto-camping only has 2 hole victor rienz in stock and 1 hole elna head gasket. I've never heard of elna, are they a reputable manufacturer? I wanted to use a 2 hole gasket thinking that it might eliminate haed gasket failure under high boost. Is thinking correct?

it might not eliminate hg failures, but it will surely reduce the possibility of them occuring.

the only reason these motors have such high compression is for cold starts. you could probably get away with 300 psi compression or maybe even a bit lower if the car was started at full operating temperature.

it has been stated before in some threads that using a thicker hg to decrease compression isn't a wise idea as it changes something to do with injector spray pattern in the piston reliefs or something like that... i have a huge headache otherwise i'd remember.

fastvicar · « **Reply #11 on:** December 07, 2007, 08:35:30 am »

What about the 3-notch one?