Author Topic: 1.6TD with 1.9 IDI head gasket  (Read 410 times)

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Hic

  • Posts: 203
1.6TD with 1.9 IDI head gasket
« on: Dec 31, 17, 04:17 »
I have a 1990 1.6TD with hydraulic lifters.  Which 1.9 head gasket will fit on it?  When looking at 1.9 headgasket options, they have ones with 1, 2 and 3 notches/holes indicating different thickness.  Is the 3 notch/hole (1.61mm) the one I need?  I have read that the compression ratio will become slightly lower with the 1.9 head gasket's additional space around the cylinder walls.  Will using a thinner 2 notch/hole (1.57mm) be better, since it increases the compression ratio to compensate for the decrease at the cylinder holes?

Thanks
« Last Edit: Dec 31, 17, 04:18 by Hic »

Autohau5

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Re: 1.6TD with 1.9 IDI head gasket
« Reply #1 on: Dec 31, 17, 09:30 »
You need to use the same thickness as you currently have. The different headgasket thicknesses are for Piston protrusion. Installing a thinner gasket will most likely result in piston to valve interference. Yes you will lose compression due to the larger bore size of the AAZ headgasket.

Any particular reason you want to switch to the AAZ gasket? Planning on a high HP motor?

How many holes on your 1.6 gasket?
'01 A6 2.7TT 6MT  |  '81 Rabbit S 16VG60   |  '15 Touareg TDI R-Line   |   '96 YZF750R

Hic

  • Posts: 203
Re: 1.6TD with 1.9 IDI head gasket
« Reply #2 on: Dec 31, 17, 11:13 »
You need to use the same thickness as you currently have. The different headgasket thicknesses are for Piston protrusion. Installing a thinner gasket will most likely result in piston to valve interference. Yes you will lose compression due to the larger bore size of the AAZ headgasket.

Any particular reason you want to switch to the AAZ gasket? Planning on a high HP motor?

How many holes on your 1.6 gasket?

Mostly for the reliability. I am going to install ARP head studs and turn up the boost to low 20s.