JUN valve spring......why do i need this..? answ...OEM may float during high rpm and high power..especially 400whp and above ur engine might be like fuel starving... but when i got this spring and try to see any diffrent..well both are similar in shape, just that jun has more roundness...how ever when i tried to compress to see the spring rate..both of it are bout the same..hmm..
280 duration with 11mm valve lift. at first i would like to have tomei racing cam shaft, but since many seller got no stock than i change to JUN...why tomei...? becouse tomei has 11.1mm lift and proven more power can be produced..try to google on "cam test"...
let see the dimension on pictures above... JUN =36.38mm , OEM = 35.32mm... so diff about 1.06mm
the JUN cam looks so beefy...to open the valve much more longer so than more air can be forced in to combustion
Have u tuned them..? Any comments on the Jun 280?
ReplyDeleteyup..i had tuned with this cam..my comment..:
ReplyDeletefirst of tought mostly high lift cams that come from japan does'nt require to degree our cam gear, like Tomei porncam..how ever Jun 280 cam require to do it.. i have to degree my cam gear(cam pully) as the center line for this cam is few degree off (advanced). that's make me higher at top end and lower power at low rpm..i want it to be more on power during turbo spool up so i have to dail this cam with cam gear..
correction!.. sorry, my cams are few degree off retard so i have to advance it with cam gear. after done this then i can advancing my CAS for correct ignition timing at 10 deg.
ReplyDeleteFYI without degreeing my cam gear. i'll be suffering on cruising below 3Krpm..i feel alot of jerking, so for cruising i have to rev it more than 3K.
bro, can u explain how to differentiate between genuine 4g93 jun camshaft and the other brands like jasma, pipercams, etc? are they embossed with JUN logo?
ReplyDeletei'm not really sure how to differentiate the genuine. but jun cams u might not see any of jun logo stamped on it. i know there is a part no. at the side of the cams( engraved). may be that one way to identified..and i'm not sure if other brand copying, but i think not.
ReplyDeletei know that piper making a race cams for long time ago rather than jasma,just that piper is not really well known.