Wez Posted May 20, 2002 Share Posted May 20, 2002 Thanks Alex Any reason why you prefer the Jun cams to the HKS? Quote Link to comment Share on other sites More sharing options...
Digsy Posted May 20, 2002 Share Posted May 20, 2002 Alex is right, there was an in-depth discussion about what were the limiting factors for revs in the 2JZ a while back. Taking valvetrain in isolation, a longer duration / higher lift cam will allow the engine to breathe better at higher RPM (a'la Honda VTEC). The valve spring, however, will only have been engineered to prevent the follower from floating up to a certain engine RPM. Going significantly higher will probably require a new spring pack. As for running in (harking back to the start of thr thread), this is a new one on me because cam lobes are ususally hardened (either by induction of remelting), so they shouldn't wear much when new, and any kind of wear on a follower is a bad thing. I have, however, seen top ends built up with a blob or two of molybdinum (sic?) grease on the cam lobes to help with rotating the cams when setting the timing, and for protection on the very first run. Quote Link to comment Share on other sites More sharing options...
Ian C Posted May 20, 2002 Share Posted May 20, 2002 I don't know if simply removing and refitting the cams is the same as installing entirely new ones, but - just jam them in and pour a load of engine oil over the top. Job done Ahh, the joys of MkIII BHGs. It's amazing what you learn. -Ian Quote Link to comment Share on other sites More sharing options...
Alex Posted May 20, 2002 Share Posted May 20, 2002 Originally posted by Wez Thanks Alex Any reason why you prefer the Jun cams to the HKS? 'cause they ain't HKS Not really, With the JUN cams you get the same 9.3mm of lift what ever the duration (bar the special 10.8mm lift ones) they do the same durations as HKS but with none of the staging...allowing you to run milder cams whic are technically able to flow as well as the HKS ones one stage up, (If you bore out your exhaust port!) With the 9.3mm across the board it is better able to cope with future upgrades... But if HKS are your thing then go for it...nothing wrong with them. The difference in lift on a fairly stock motor will make no difference to the engines power output if you don't intend to do more than the cams. HKS cams have a lift range of 8.3?mm on the 254's and 9.3? on the 272's, I believe..haven't looked for a while...its worth checking. My only real reasons for picking Jun is because their Demo cars are just so fantastic. And alot of their products are made by or inconjunction with Cosworth. So your sort of buying British But you can't buy direct from Cosworth Also have a look at Crower Cams they are different and you can get custom ones made Quote Link to comment Share on other sites More sharing options...
GavinL Posted May 20, 2002 Share Posted May 20, 2002 Originally posted by Terminator Then you just run them in at set revs for a specified time (minutes) under no load. Job done. Above confirmed by Leon today. HKS 264's going in my car this week, in the light of the earlier posts expecting no benefit from them other than slight improvement in acceleration due too lighter wallet Quote Link to comment Share on other sites More sharing options...
Alex Posted May 20, 2002 Share Posted May 20, 2002 If its any consolation it should sound a bit more race like I would also imagine you will notice an improvement through lower lag time...let us know how you get on. Though to feel the full benefit you'll have to adjust your fueling...won't you? Quote Link to comment Share on other sites More sharing options...
GavinL Posted May 20, 2002 Share Posted May 20, 2002 Originally posted by Alex Holdroyd If its any consolation it should sound a bit more race like I would also imagine you will notice an improvement through lower lag time...let us know how you get on. Though to feel the full benefit you'll have to adjust your fueling...won't you? HKS are supposed too be providing a dyno sheet of their cams on a stock turboed Supra. There is a thread on their forums on http://www.hksusa.com from a few weeks back. If a few more people could add a comments on the end it might jog them along. As for the fueling, I leave that sort of thing too Leon. I got a drop of oil on me today by accident......very nasty. Quote Link to comment Share on other sites More sharing options...
Alex Posted May 20, 2002 Share Posted May 20, 2002 Originally posted by GavinL I got a drop of oil on me today by accident......very nasty. I know where you're coming from Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted May 20, 2002 Share Posted May 20, 2002 Originally posted by Alex Holdroyd With the JUN cams you get the same 9.3mm of lift what ever the duration (bar the special 10.8mm lift ones) they do the same durations as HKS but with none of the staging... Remember the phrase 'can't get something for nothing'. No graduated lift will mean more stress on the shims and valve components when that lobe comes round, hence shortening their lifespan. So if your Supe is a daily driver may not be the best solution reliability wise. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted May 20, 2002 Share Posted May 20, 2002 Originally posted by Martin F Remember the phrase 'can't get something for nothing'. No graduated lift will mean more stress on the shims and valve components when that lobe comes round, hence shortening their lifespan. So if your Supe is a daily driver may not be the best solution reliability wise. Even the high lift JUN cams have what is considered a fairly modest amount of lift nowadays, they also supply suitable springs to match. I doubt wear will be a problem, although the stresses will, of course, be higher than with stock cams. The stock valves have dirty big thick stems and hefty collets, I doubt those boat anchors will break into a sweat :-) Quote Link to comment Share on other sites More sharing options...
Rich J Posted May 20, 2002 Share Posted May 20, 2002 Originally posted by Alex Holdroyd For reliabilities sake I'd stick to the current rev limit until you have an engine bay full of other mods... much to my own personal dissapointment You picked the wrong engine for high rev living PS have a look at JUN cams they are the *ollocks JUN is what I'll be using for my cam replacement, quality stuff and if you e-mail them the CEO e-mails you back!!! Quote Link to comment Share on other sites More sharing options...
Alex Posted May 20, 2002 Share Posted May 20, 2002 Originally posted by Martin F Remember the phrase 'can't get something for nothing'. No graduated lift will mean more stress... Eh?? I mean't HKS cams are lower lift on a 254deg cam than a 272. The Jun Cams are all 9.3mm but for one pair which are 10.8mm. The entire valve train from JUN is £1600 got the price off their cheif engineer a while ago...Rich how'd you get the CEO? Or was the sales director at lunch when you mailed them? Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted May 20, 2002 Share Posted May 20, 2002 If i remember rightly the JUN profile is more aggressive. Quote Link to comment Share on other sites More sharing options...
Alex Posted May 20, 2002 Share Posted May 20, 2002 If the Lobe is the same size it would have to be more aggresive when you compare the 254's against each other but the 272's would be the same...and we are talking about 1mm of extra lift at max...at about £100 for the springs (max) is it not worth replaceing them and the retainers & shims anyway? Quote Link to comment Share on other sites More sharing options...
Rich J Posted May 21, 2002 Share Posted May 21, 2002 Originally posted by Alex Holdroyd Rich how'd you get the CEO? Or was the sales director at lunch when you mailed them? Don't know I just asked about prices on a full JUN camkit for the Teg (cams, springs, Ti retainers, cam gears) and got a reply from the Executive President Junichi Tanaka!! Quote Link to comment Share on other sites More sharing options...
Rich J Posted May 21, 2002 Share Posted May 21, 2002 Originally posted by Martin F If i remember rightly the JUN profile is more aggressive. If they arer anything like the Integra ones they will have a very aggressive ramp and may be holding the valve open wider for longer than the HKS, can't tell without seeing the profile charts. Quote Link to comment Share on other sites More sharing options...
Wez Posted May 21, 2002 Share Posted May 21, 2002 Where are you looking on the Jun website because at http://www.junauto.co.jp the supra cams are still in development. Quote Link to comment Share on other sites More sharing options...
Rich J Posted May 22, 2002 Share Posted May 22, 2002 Originally posted by Wez Where are you looking on the Jun website because at http://www.junauto.co.jp the supra cams are still in development. That's only the full kits (cams, springs (not yet available), retainers, and any other stuff they throw in) that are not available. The cams themselves are available for 46,000Yen each Quote Link to comment Share on other sites More sharing options...
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