Manley 11103-1 BBC Exhaust SS Severe Duty Valve 11-32 Stem 29 mm Head Dia. x 6 mm / .2362” Stem Dia. Installed Height
Type: Exhaust
Head Dia.: 29 mm
Stem Dia.: 6 mm / .2362”
Installed Height:
Length: 101.52 mm
Tip Length: 3.5 mm
Underhead Angle/Radius: 25° x 11/32"
Margin: .065"
Seat Width: .080"
Top of Head: 20° Dish
XH-426 Stainless Exhaust Material
NK-842 Stainless Intake Material
Chrome Stems and Hard Tips
Swirl Polished and Fully Machined
Improved flow with “Pro Flo” Intakes
MAZDA MIATA 1.8L - DOHC 16 VALVE ( BP056 ) - 1990 - 1999
The Severe Duty series of valves is the
Manley signature in the performance and racing industry. Exhaust
material XH-428 and intake material NK-844 is offered by no
competitor in the world. And no pair of materials show such clear and
demonstratable dominance over all others. Ultimate tensile strength
of XH-428 at 1500°F is nearly double the competitor's EV-8. At
1000°F the Manley NK-844 displays more than four times the ultimate
tensile of the competition’s best intake material.
In
addition to the vastly superior strength and fatigue characteristics
of Manley NK-844, our exclusive intake material exhibits an uncanny
ability to resist chordal fractures. In an excellent sealing
combustion chamber, the intake valve is actually deformed by the fuel
explosion and pushed up into the port. The effect of this continuous
deformation on competitors’ material eventually is a chordal
fracture propagating from the circumference of the valve and quickly
becoming a missing pie shaped piece. Manley NK-844 is the absolute
best choice of material to combat disastrous chordal
fractures.
Further proof of the superiority of the Manley
Severe Duty valves is evident in our comprehensive fatigue tests. In
normal operation where valve float is nonexistent,a valve will
experience 20,000 to 25,000 lbs of applied stress. However, when
valves bounce on the seat the stress immediately soars to 40,000 to
60,000 lbs. Manley exhaust valves ( at 40,000 psi and 1400°F ) ran
to100,000,000 ( one hundred million ) cycles while competitors failed
at 100,000 cycles. That’s 1000 times better fatigue life.
Manley
Performance is universally acknowledged as the leading manufacturer
of performance and racing valves in the world.
The reason for
Manley’s overwhelming success is simple: QUALITY. We offer the best
materials in the industry - exclusive materials our competitors do
not possess. Our stems are hard coated with .0002" thick chrome
rather than a few millionths of flash. Our hard tips are superior to
competitors’ puddled stellite which can crack and erode off the
stem. Our valve head and under head shapes have been in the forefront
of the quest for improved flow since the late 1960’s. And always
each Manley valve has been price targeted to specific markets to
ensure the best possible value to the customer.
1 Each Individual Valve
This product was added to our catalog on Tuesday 19 April, 2011.