#1
·
Nov 23, 2007
I am trying to compile a list of cam data for available cams for the EVOs.
Attached is a list of what i've got so far.
Anyone got comments on the list, or pointers on where to find more cam data?
Also, recommended timing on different cams are also much appreciated.
#2
·
Nov 23, 2007
Forgot that this version of vbulletin has some quirks on attachement handling...
#3
·
Nov 23, 2007
Factory EVO
Advertised Duration - 260 deg Int / 256 deg Exh
Effective Duration - ___ deg @ 1mm Int / ___ deg @1mm Exh
Lift - 10.0mm Int / 9.5mm Exh
Lobe Centerlines - 109 deg Int /111 deg Exh
LSA - 110 deg
JDM EVO MR
Advertised Duration - 260 deg Int / 256 deg Exh
Effective Duration - ___ deg @ 1mm Int / ___ deg @1mm Exh
Lift - 10.0mm Int / 9.5mm Exh
Lobe Centerlines - 113 deg Int /112 deg Exh
LSA - 112.5 deg
Comp Cams 264+
Advertised Duration - 248 deg Int / 248 deg Exh
Effective Duration - ___ deg @ 1mm Int / ___ deg @1mm Exh
Lift - 10.8mm Int / 10.2mm Exh
Lobe Centerlines - 104 deg Int / 112 deg Exh
LSA - 108 deg
Upgraded valve springs recommended
Comp Cams 272+
Advertised Duration - 256 deg Int / 257 deg Exh
Effective Duration - ___ deg @ 1mm Int / ___ deg @1mm Exh
Lift - 10.8mm Int / 10.2mm Exh
Lobe Centerlines - 104 deg Int / 112 deg Exh
LSA - 108 deg
Upgraded valve springs recommended
Comp Cams 280+
Advertised Duration - 264 deg Int / 265 deg Exh
Effective Duration - ___ deg @ 1mm Int / ___ deg @1mm Exh
Lift - 11.0mm Int / 10.4mm Exh
Lobe Centerlines - 104 deg Int / 112 deg Exh
LSA - 108 deg
Upgraded valve springs recommended
GSC 264
Advertised Duration - 268 deg
Effective Duration - 194 deg @ 1mm
Lift - 10.6mm Int / 10.0mm Exh
Lobe Centerlines - ___ deg Int / ___ deg Exh
LSA - ___ deg
Stock valve springs OK
GSC 272
Advertised Duration - 281 deg
Effective Duration - 203 deg @ 1mm
Lift - 10.6mm Int / 10.0mm Exh
Lobe Centerlines - ___ deg Int / ___ deg Exh
LSA - ___ deg
Stock valve springs OK
HKS 264
Advertised Duration - 264 deg
Effective Duration - 206 deg @ 1mm
Lift - 10.8mm Int / 10.2mm Exh
Lobe Centerlines - 110 deg Int / 110 deg Exh
LSA - 110 deg
Stock valve springs OK
HKS 272
Advertised Duration - 272 deg
Effective Duration - 214 deg @ 1mm
Lift - 10.8mm Int / 10.2mm Exh
Lobe Centerlines - 110 deg Int / 110 deg Exh
LSA - 110 deg
Stock valve springs OK
HKS 280
Advertised Duration - 280 deg
Effective Duration - 222 deg @ 1mm
Lift - 10.8mm Int / 10.2mm Exh
Lobe Centerlines - 110 deg Int / 110 deg Exh
LSA - 110 deg
Stock valve springs OK
JUN 264
Advertised Duration - 264 deg
Effective Duration - ___ deg @ 1mm
Lift - 10.5mm
Lobe Centerlines - ___ deg Int / ___ deg Exh
LSA - ___ deg
Upgraded valve springs required
JUN 272
Advertised Duration - 272 deg
Effective Duration - 235 deg @ 1mm
Lift - 10.8mm
Lobe Centerlines - 110 deg Int / 115 deg Exh
LSA - 112.5 deg
Upgraded valve springs required
Piper Ultimate Road
Advertised Duration - 265 deg
Effective Duration - 217 deg @1mm Int / 211 deg @1mm Exh
Lift - 11.5mm Int / 10.8mm Exh
Lobe Centerlines - 108 deg Int / 107 deg Exh
LSA - 107.5
Upgraded valve springs required
Piper Rally
Advertised Duration - 265 deg
Effective Duration - 217 deg @ 1mm
Lift - 11.5mm
Lobe Centerlines - 108 deg Int / 107 deg Exh
LSA - 107.5
Upgraded valve springs required
Piper Race
Advertised Duration - 272 deg
Effective Duration - 224 deg @ 1mm
Lift - 12.0mm
Lobe Centerlines - 106 deg
LSA - 106 deg
Upgraded valve springs required
Revolver 262/264
Advertised Duration - 262 deg Int / 264 deg Exh
Effective Duration - 222 deg @ 1mm Int / 223 deg @ 1mm Exh
Lift - 11.4mm Int / 11.5mm Exh
Lobe Centerlines - 109 deg Int / 111 deg Exh
LSA - 110 deg
Upgraded valve springs required
Tomei Poncam
Advertised Duration - 260 deg
Effective Duration - ___ deg @ 1mm
Lift - 10.7mm Int / 10.2mm Int
Lobe Centerlines - 110 deg Int / 115 deg Exh
LSA - 112.5 deg
Stock valve springs OK
Tomei Procam
Advertised Duration - 280 deg
Effective Duration - ___ deg @ 1mm
Lift - 11.5mm Int / 11.5mm Exh
Lobe Centerlines - 110 deg Int / 115 deg Exh
LSA - 112.5 deg
Upgraded valve springs required
Cosworth M1
Advertised Duration - 240 deg Int / 240 deg Exh
Effective Duration - ___ deg @ 1mm Int / ___ deg @1mm Exh
Lift - 10.2mm Int / 10.2mm Exh
Lobe Centerlines - 107 deg Int / 113 deg Exh
LSA - 110 deg
Upgraded valve springs recommended
Cosworth M2
Advertised Duration- 252 deg Int / 246 deg Exh
Effective Duration - ___ deg @ 1mm Int / ___ deg @1mm Exh
Lift- 11.0mm Int / 11.0mm Exh
Lobe Centerlines - 107 deg Int / 113 deg Exh
LSA - 110 deg
Upgraded valve springs recommended
Works 269:
Duration of 269 deg ???
Duration of ___ deg @ 1mm
Lift of 10.8mm intake / 10.1mm exhaust
Stock valve springs OK ???
Evo400 Piper
Duration of 276 deg 09/10spec
Duration of 226in 220ex deg @ 1mm
Lift of 11.5mm intake / 10.8mm exhaust
Stock valve springs NO
GSC S1
S1 Specs gsc-6030S1
Intake 269 Duration
9.90mm peak lift,
108 degree Centerline
Exhaust 269 Duration
9.90mm Peak Lift,
116 degree Centerline
GSC S2
S2 Specs gsc-6030S2
Intake 274 Duration
10.20mm peak lift,
109 degree Centerline
Exhaust 274 Duration
10.20mm Peak Lift,
119 degree Centerline
#4
·
Nov 23, 2007
Superb info there :smthumbup
Got Crower 272 s in mine now, eventually going to run a twin sroll gt35, was going to change my cams when the engine was getting done, but i dont think i will see much gains swapping to similar duration cams offset power/cost
#5
·
Nov 23, 2007
nippy hippy said:
Superb info there :smthumbup
Got Crower 272 s in mine now, eventually going to run a twin sroll gt35, was going to change my cams when the engine was getting done, but i dont think i will see much gains swapping to similar duration cams offset power/cost
Cheers
. Just a copy an paste with a few added.
Cams are a real mine field to say the least.
#6
·
Nov 23, 2007
I think GSC S1s differ between the Evo VIII and Evo IX cams.
#7
·
Nov 23, 2007
Thanks Ross! Lots of more info to compile now.
Regarding lobe centerlines for the JUN cams. It is interesting that there has been some different recommendations for setting them, like 110/110, 110/115 and the recommendation of 108/112 for which i have settled on.
#8
·
Nov 24, 2007
Here is a merge with the cam data provided by ross.
Points that need to be resolved are marked with cyan color.
#9
·
Nov 24, 2007
(Edited)
There is a profile change from the stock evo 4 to the stock evo5-7.....I know this is not too relavent for the aftermarket scene though.
The evo8 gsr carries a much improved stock valve spring and retainer (tapered and titanium) which may confuse which models actually require a spring change.
This is going to be a very informative thread
#10
·
Nov 24, 2007
When i bought my crower 272 cams, on the website it did say the oem springs/retainers would be ok with this wildish cam
when fitted was getting valve float on my gsr 7, maybe the 8 s would have took it
worked out better in the long run with my goal power of 600 bhp but in hindsight would have bought the 264
Paul
#11
·
Nov 24, 2007
The evo 8 was the first of this family two engine in the States so their advertisments of spring replacements may not support all evo from 4-7 and the evo 8 260 As they didn't have these cars other than the 'Grey imports' of course.
#12
·
Nov 24, 2007
cheers Clive Why does this info appear after you bought them
Its like buying that 3 peice suite and the week after it goes half price
#15
·
Sep 21, 2012
Still no one has duration at 1mm for the JUN 264's?
Sorry for 5 year thread necro...
#16
·
Sep 21, 2012
What's the advantage of upgraded valve springs, as I`m running Piper Ultimate road cams with stock springs?
#17
·
Sep 21, 2012
270 or 285? You'll be lucky if the valve oil seal tops haven't already been knocked off. Also stock spring pressure too weak for big rpm and big boost, you'll get float
0
Reply
#21
·
Sep 24, 2012
(Edited)
so let me get this straight? according to that chart the inlet should be open 0.050" 1.27mm at 7 degrees before top dead center? and the inlet should have 0.050" to left close at 31 degrees after bottom dead center
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.