Silece2k6 Posted October 21, 2016 Share Posted October 21, 2016 Hi. I want to install my Hks 272 Cam next time. I got a good offer for HKS "Style" Cam Gears (Gen2) Anyone any Infos about this Gears? They only have 3-Bolts. Some Safety Problems? Because other Brands have 5+ Bolts. Greetings Patrick Quote Link to comment Share on other sites More sharing options...
bignum Posted October 21, 2016 Share Posted October 21, 2016 Get proper 5 bolt ones. Quote Link to comment Share on other sites More sharing options...
Richie_k83 Posted October 21, 2016 Share Posted October 21, 2016 I would stick with legit HKS ones personally, or any other reputable brand. Buying cheap and having it fail could cost you much more then you saved... Quote Link to comment Share on other sites More sharing options...
Silece2k6 Posted October 21, 2016 Author Share Posted October 21, 2016 Thanks guys. But I have never heard about problems with the HKS Gears. Of course, 5 screws better, but why should not also hold three. hks has bolt both versions with 3, so it apparently is indeed proven... ? Quote Link to comment Share on other sites More sharing options...
Lee P Posted October 21, 2016 Share Posted October 21, 2016 The 3 bolt Hks are fine as long as they are the current ones and genuine Hks Don't buy copy ones or the early style ones. Quote Link to comment Share on other sites More sharing options...
j_jza80 Posted October 21, 2016 Share Posted October 21, 2016 I will never understand why people will try and skimp on something that can cause thousands of £ worth of damage if it fails. Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted October 21, 2016 Share Posted October 21, 2016 I will never understand why people will try and skimp on something that can cause thousands of £ worth of damage if it fails. I've seen a cam gear come straight off a running 2J from the mechanic not torqing down the cam bolts properly. Aside from a new cam belt and a scratched up cam cover, there was no damage, so no need to exaggerate that there will be thousand of pounds of damage. Non interference ftw Quote Link to comment Share on other sites More sharing options...
Silece2k6 Posted October 21, 2016 Author Share Posted October 21, 2016 I've seen a cam gear come straight off a running 2J from the mechanic not torqing down the cam bolts properly. Aside from a new cam belt and a scratched up cam cover, there was no damage, so no need to exaggerate that there will be thousand of pounds of damage. Non interference ftw Agree! So you should torqui the Bolt correctly Please read this. You should not use the Stock Timing Belt for aftermarket Cam Gears: http://www.supraforums.com/forum/showthread.php?324084-Warning-HKS-CAM-GEARS-Timing-belt-Eater! Quote Link to comment Share on other sites More sharing options...
j_jza80 Posted October 21, 2016 Share Posted October 21, 2016 I've seen a cam gear come straight off a running 2J from the mechanic not torqing down the cam bolts properly. Aside from a new cam belt and a scratched up cam cover, there was no damage, so no need to exaggerate that there will be thousand of pounds of damage. Non interference ftw The 2jz is a non interference engine as stock. But the only sensible reason you would fit adjustable cam gears is to fit high lift camshaft, in which case I believe I'm correct in saying the 2jz becomes an interference engine. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted October 21, 2016 Share Posted October 21, 2016 The 2jz is a non interference engine as stock. But the only sensible reason you would fit adjustable cam gears is to fit high lift camshaft, in which case I believe I'm correct in saying the 2jz becomes an interference engine. Its not the lift that would make it interference...its the timing/duration that would cause this, however unless the cams where very high duration, which is not necessary with a FI engine its still unlikely. Quote Link to comment Share on other sites More sharing options...
Wez Posted October 21, 2016 Share Posted October 21, 2016 The 2jz is a non interference engine as stock. But the only sensible reason you would fit adjustable cam gears is to fit high lift camshaft, in which case I believe I'm correct in saying the 2jz becomes an interference engine. Correct, although you do need to go a bit higher in lift, from memory the HKS 256, 264 do not lift high enough to cause an issue, the JUN 264 and HKS 272 possibly, or is there two version of the HKS 272, a higher lift version I think. The JUN cam wheels are worth mentioning, I had them fitted to mine when CW did the cam setup Quote Link to comment Share on other sites More sharing options...
Wez Posted October 21, 2016 Share Posted October 21, 2016 Its not the lift that would make it interference...its the timing/duration that would cause this, however unless the cams where very high duration, which is not necessary with a FI engine its still unlikely. Really, my understanding is the lift is how far down into the cylinder the valve protrudes, duration is how long its open. The stock cams and some aftermarket have lift that even when a cam belt fails if the valve is fully extended it would not touch a piston, the higher lift cams remove this safety margin. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted October 21, 2016 Share Posted October 21, 2016 Really, my understanding is the lift is how far down into the cylinder the valve protrudes, duration is how long its open. The stock cams and some aftermarket have lift that even when a cam belt fails if the valve is fully extended it would not touch a piston, the higher lift cams remove this safety margin. I know if the lift is enough this can happen, but my understanding is that it needs considerable extra lift for this to happen, but if a cam has extended duration especially at the early opening and closing contact is more likely to happen if the belt snaps while running, especially at high RPMs. But yes i was thinking ass about face on making that comment. Quote Link to comment Share on other sites More sharing options...
Wez Posted October 21, 2016 Share Posted October 21, 2016 (edited) Its been a while since I looked into 2JZGTE cams but just found these :- JDM 248 IN/EX 8.61/8.79mm (stock jspec) HKS 256 IN/EX 8.7mm HKS 264 IN/EX 9.0mm HKS 272 IN/EX 9.3mm HKS 280 IN/EX 9.3mm JUN 256 IN/EX 9.3mm JUN 264 IN/EX 9.3mm JUN 272 IN/EX 9.3mm JUN 272 IN/EX 10.8mm (special option, interference) BC 264 IN/EX 9.52/9.52mm BC 272 IN/EX 9.52/9.65mm BC 276 IN/EX 10.29/10.29mm BC 280 IN/EX 11.48/11.48mm WB 264 IN/EX 9.3mm WB 280 IN/EX 9.9mm SRD 264 IN/EX 9.5mm SRD 269 IN/EX 9.6mm SRD 280 IN/EX 9.9mm EDIT: managed to find the HKS 256 info Edited October 21, 2016 by Wez (see edit history) Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted October 21, 2016 Share Posted October 21, 2016 The 2jz is a non interference engine as stock. But the only sensible reason you would fit adjustable cam gears is to fit high lift camshaft, in which case I believe I'm correct in saying the 2jz becomes an interference engine. Most people I see in the UK who have them do it for the bling factor rather than getting any performance gain from adjustable cams. But yes, in theory they should complement aftermarket cams Quote Link to comment Share on other sites More sharing options...
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