VW / Audi 1.8T 20V

ENGINE BEARINGS
	MAIN BEARING SET
	Part#
	5M1644H	5M1644HX
Sizes	STD, .25, .50	STD
Oil Clearance	Standard	+ 0.001" Extra
Half Type	Upper & Lower
Material	Tri-metal
Min Std Shaft Size	2.1243in / 53.958mm
Max Std Shaft Size	2.1251in / 53.978mm
Min Std Tunnel Size	2.3228in / 59.000mm
Max Std Tunnel Size	2.3236in / 59.019mm
Max Wall at Crown	0.0985in / 2.502mm	0.0980in / 2.489mm
Max Overall Length	0.728in / 18.49mm
Notes	Set contain 6 x 1648H and 4 x 1644H shells. Use 1648H shell in #4 position as upper and lower.
Diagram        (Top View)

Engines VAG group 4 cylinder engines 1.6 1.8 2.0 16-20V (KR, PL, AEB, etc.)

Spring data:
Seat pressure: intake - 60lbs @ 36.60mm, exhaust - 91lbs @ 33.20mm
Spring coil bind: intake - 23.00mm, exhaust - 18.50mm
Max lift: intake - 13.60mm, exhaust - 14.70mm
Rate: intake - 6.70lbs/mm, exhaust - 12.50lbs/mm
Intake single spring:
Outer diameter - 20.60mm
Inner diameter - 14.40mm
Exhaust double spring:
Outer spring outer diameter - 30.20mm
Outer spring inner diameter - 22.20mm
Inner spring outer diameter - 22.20mm
Inner spring inner diameter - 16.80mm

Set includes:
Intake springs - 12 pcs. SPR-A2095
Exhaust springs - 8 pcs. SPR-H1002DR-AU
Titanium retainers: 12 pcs. intake RET-AU5VI-T2, 8 pcs. exhaust RET-AU5VE-T1
Seats - 8 pcs. exhaust SEAT-H1000

Ferrea Competition Plus Valves have built a reputation as the industry's most reliable extreme duty valve. To manufacture the valves we use special aerospace quality alloys, including the EV8-Z18, which provides high tensile strength. An exclusive two-step slow forging process ensures proper grain flow and virtually eliminates any damage to thematerial structure. The valves are then heat-treated and stress-relieved over a 48-hour period, which is the crucial base of our molecular integrity. These valves feature avionics-quality hard chrome along with a specially applied hard tip.

The Super Alloy Engine valves represent the highest level of sophistication in valve technology. These valves are designed to handle the extreme heat requirements and punishment of today’s Nitro Fuels, Supercharged, Turbocharged, Nitrous Oxide, and Marine race motors.

Product detailed specification
Bore size	81.50mm
Stroke	86.40mm
Mahle motorsport compression ratio (CR)	8.5:1
OEM compression ratio (CR)	9.5:1
Dome volume (CC)	-12cm3
Compression height (CH)	32.70mm
Pin diameter	20mm
Features	4032 alloy
Fits for	VAG - 1.8T 20V

Engines VAG group 4 cylinder engines 1.6 1.8 2.0 16-20V (KR, PL, AEB, etc.)

ENGINE BEARINGS
	MAIN BEARING SET
	Part#
	5M1644H	5M1644HX
Sizes	STD, .25, .50	STD
Oil Clearance	Standard	+ 0.001" Extra
Half Type	Upper & Lower
Material	Tri-metal
Min Std Shaft Size	2.1243in / 53.958mm
Max Std Shaft Size	2.1251in / 53.978mm
Min Std Tunnel Size	2.3228in / 59.000mm
Max Std Tunnel Size	2.3236in / 59.019mm
Max Wall at Crown	0.0985in / 2.502mm	0.0980in / 2.489mm
Max Overall Length	0.728in / 18.49mm
Notes	Set contain 6 x 1648H and 4 x 1644H shells. Use 1648H shell in #4 position as upper and lower.
Diagram        (Top View)