2501967
tarmac rally - race
Honda K20A
I-4cyl 2.0L 16v DOHC (RPR/RPR)
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intake
exhaust
camshaft data:
lash ramp
: 0.30mm
: 0.30mm
duration @ 0.1mm
: 332°
(278-278)
: 336°
(278-278)
duration @ 1.0mm
: 256°
(237-237)
: 260°
(227-227)
valve lift
: 13.60mm
(10.80-10.80)
: 12.90mm
(10.55-10.55)
cam lift
: 7.85mm
(6.25-6.25)
: 7.40mm
(6.10-6.10)
lobe angle
: 114°
(114-114)
: 106°
(106-106)
timing @ 1.0mm
: 14° / 62°
: 56° / 24°
valve lift @ TDC
: 2.85mm
(1.70-1.70)
: 4.20mm
(2.05-2.05)
parts setup:
cam wheels :
:
:
follower
: O.E.M.
: O.E.M.
valve lash
: O.E.M.
: O.E.M.
valve
: O.E.M.
: O.E.M.
valve locks
: O.E.M.
: O.E.M.
upper retainer
: View 99356/s
: View 99356/s
lower retainer
: O.E.M.
: O.E.M.
exterior spring
: View PAC-E15009
: View PAC-E15009
interior spring
: View PAC-I15009
: View PAC-I15009
fitted load / length
: 31kg @ 35.0mm
: 31kg @ 35.0mm
max. load / lift
: 107kg @ 14.0mm
: 107kg @ 14.0mm
REMARKS :
REMARKS :
#
-Use adjustable sprocket "THO025" to disable the intake VVT system
-Check interference between cam and rocker arm, modify rocker arm if required
#
FOR COMPETITION APPLICATIONS ONLY. Following details must be verified:
-
the camshafs must turn smooth in the cylinderhead, provide free travel by machining where needed
-
distance between valve seal and retainer at full lift must be 0.6mm at least
-
minimum valve spring travel of 1.0mm at full lift must be provided
-
distance between valve and piston 1.0mm (pref. 1.5mm). check 5-15° before TDC on exhaust, and after TDC on intake
#
VVT reprogramming, operating range adjustment or even eliminating the VVT system should be considered for camshafts with increased duration
#
ONLY for use in competition engines with independent engine management (throttle position sensor) or carburettors