Wez Posted June 28, 2005 Share Posted June 28, 2005 Hey All, Does anybody run a 264in/272ex setup, if so did you try a different cam profile and how does this compare. HKS 264in - 9.25mm HKS 272ex - 9.35mm JUN 264in - 9.30mm JUN 272ex - 9.30mm or 10.8mm Quote Link to comment Share on other sites More sharing options...
Alex Posted June 28, 2005 Share Posted June 28, 2005 Wez, FYI, Don't think you can run the Jun 272 10.8 withough head/piston work.... Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted June 28, 2005 Share Posted June 28, 2005 Wez have you seen Steve's site http://www.moreboost.org/cams.htm Quote Link to comment Share on other sites More sharing options...
Wez Posted June 28, 2005 Author Share Posted June 28, 2005 I think you are right, plus does 10.8mm make it an interfence engine or is it 11mm? Quote Link to comment Share on other sites More sharing options...
Alex Posted June 28, 2005 Share Posted June 28, 2005 10mm is when it becomes interference. Quote Link to comment Share on other sites More sharing options...
Wez Posted June 28, 2005 Author Share Posted June 28, 2005 Wez have you seen Steve's site http://www.moreboost.org/cams.htm Hey Terry, yeah but not alot of info on the JUN cams, interestingly I have not looked at the hp/tq graphs at the top of the page before, they take you to the HKS site and the HKS 264/264 setup looks the best all round setup but even HKS do not show a graph with them staggered. What are the pro/cons of staggering the cam profile? Quote Link to comment Share on other sites More sharing options...
Wez Posted June 28, 2005 Author Share Posted June 28, 2005 Would the JUN cams with additional lift offer any benefit over the HKS items. How does the lift affect torque and power. The JUN items are approx only $50 more each. Quote Link to comment Share on other sites More sharing options...
Alex Posted June 28, 2005 Share Posted June 28, 2005 The higher the lift and duration, IMO, the more likely you are to need to replace the valve springs etc to cope. If you can't replace things like springs and shims then I would keep to a shorter duration pair like the 256/264 combo. However it's your engine. FWIW if I had a non-vvti I would go for the JUN 256/264 or 264/264 depending on whether it was on the stockers or a Single. Rather than go for longer duration HKS items. But it's more of a gut instinct than based on any imperical data. Though the moreboost web site shows they do flow much more. Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted June 28, 2005 Share Posted June 28, 2005 Wez read this mate http://www.to4r.com/techarticle.php?id=5 Quote Link to comment Share on other sites More sharing options...
JohnA Posted June 28, 2005 Share Posted June 28, 2005 I'd be sceptical of this article of to4r. (not the only thing on that site that I find questionable, mind you) For example before one starts hacking the exh ports (which they regard as "diabolical" ), maybe they could try working *with* them. (example: they are quick to find the "T" logic flawed, when the flow-benches can never replicate realistic temps of the exhaust ports. food for thought.) Quote Link to comment Share on other sites More sharing options...
jagman Posted June 28, 2005 Share Posted June 28, 2005 I agree with johna,flow benches and dynos aint real scenarios,a guide only Quote Link to comment Share on other sites More sharing options...
JohnA Posted June 28, 2005 Share Posted June 28, 2005 Anyone with an EGT gauge will suspect that there is the odd temperature variance between a flowbench (not far from room temp) and real-life exhaust ports, so close to the valves. Perhaps even over 900C at full throttle. The Toyota designers were aware of this apparently, but the to4r 'second-guessers' think they know better, bless em... Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted June 28, 2005 Share Posted June 28, 2005 John I know Lance personally, and TBH would take his advice over anyone one here all day long. This anti American crap is getting beyond a joke IMHO. Quote Link to comment Share on other sites More sharing options...
JohnA Posted June 28, 2005 Share Posted June 28, 2005 Technical discussions cannot be anti-American any more than they can be anti-communist or anti-semitist (or anti-dentist as Seinfeld would put it) You can agree to disagree ofcourse. Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted June 28, 2005 Share Posted June 28, 2005 Technical discussions cannot be anti-American any more than they can be anti-communist or anti-semitist (or anti-dentist as Seinfeld would put it) You can agree to disagree ofcourse. John you could start an argument in an empty room. :thumbdown Quote Link to comment Share on other sites More sharing options...
JohnA Posted June 28, 2005 Share Posted June 28, 2005 Just state why you disagree Terry, that would be more productive in the technical section of an enthusiasts' forum Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted June 28, 2005 Share Posted June 28, 2005 Just state why you disagree Terry, that would be more productive in the technical section of an enthusiasts' forum Sorry John done with you Quote Link to comment Share on other sites More sharing options...
Wez Posted June 28, 2005 Author Share Posted June 28, 2005 I thought it made an interesting read but I am still not sure if the JUN cams would offer anything over the HKS items with the additional lift. Although after reading that I did take on board that if I did choose a JUN 264/264 setup I would prob need to replace my valve springs etc. Quote Link to comment Share on other sites More sharing options...
Digsy Posted June 28, 2005 Share Posted June 28, 2005 I had a good look at the intake and exhaust ports on the 2JZ and thought they were a nice bit of lateral thinking. As mentioned on the TO4R site, it sis very unusual (I wouldn't go as far as to say unique) to see anything other than straight, symmetrical ports in a head these days. I thought the skewed ports were a neat engineering solution to a real-world packaging problem. In fact, IIRC the intake ports are slightly skewed as well. If they plain and simple aren't big enough then be that as it may, but personally I don't have any problems with a port that goes around corners. If they need opening up a bit then go for it with your windy tool, but its a brave man that fettles out a port surrounded by water on a mass-produced casting with a nominal wall thickness of about 4mm. As for increasing the lift and duration, this sould be easier on the valve springs than just changing the lift alone as the valve acceleration will be higher, and it is the inertia load due to this acceleration that the spring has to resist in order to keep the bucket in contact with the cam lobe. Quote Link to comment Share on other sites More sharing options...
JohnA Posted June 28, 2005 Share Posted June 28, 2005 Sorry John done with you That's your perogative Terry, this is a public forum after all. If you change your mind, you could state your reasons for believing that the following statement is true (in the context of the original text ofcourse): On the other hand, the exhausts are diabolical. Japanese engine theory bases exhaust port design on thermodynamics, not airflow. Quote Link to comment Share on other sites More sharing options...
JohnA Posted June 28, 2005 Share Posted June 28, 2005 ...In fact, IIRC the intake ports are slightly skewed as well.. They are indeed. That is to promote swirl. I found it entertaining that a tuning 'guru' on the net was advocating that people should grind them out so they become really straight... Quote Link to comment Share on other sites More sharing options...
Digsy Posted June 28, 2005 Share Posted June 28, 2005 Hmmm. I'd have said packaging again, rather than swirl. They're not all skewed by equal amounts, are they? There's a pic on here somewhere... *EDIT* Here is the link to an old thread where I first flagged it up. Looks like I thought it was swirl back then, too. Can't find the pics. Maybe I never posted them up. Quote Link to comment Share on other sites More sharing options...
Wez Posted June 28, 2005 Author Share Posted June 28, 2005 I do not intend to do any head work at all, i am only interested in changing the cams and maybe springs etc. So are we saying the the HKS 264/264 would still be the best option, or would the added lift from the JUN be worth the extra $50. Quote Link to comment Share on other sites More sharing options...
Alex Posted June 28, 2005 Share Posted June 28, 2005 I'd go for the JUN but I just like to be different...neither option is wrong so I guess the sensible choice is the HKS ones as they are cheaper. But I'd still get JUN, nudge nudge, Quote Link to comment Share on other sites More sharing options...
JohnA Posted June 28, 2005 Share Posted June 28, 2005 Hmmm. I'd have said packaging again, rather than swirl. For starters, Mr "T" says otherwise: http://www.max-boost.co.uk/max-boost/images/supra/swirl_manual_extract.gif If you think it's incorrect, I'm always keen on a tech discussion. That's what these forums are all about, enthusiasts sharing knowledge and expanding their horizons. (Maybe I'm old-fashioned eh? ) Quote Link to comment Share on other sites More sharing options...
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