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Official IS300 Cam/Head Thread

101K views 89 replies 34 participants last post by  Bezik777 
#1 · (Edited)
Official Cam and Head Thread


For all your info, questions , comments and concerns.

Background-
The Lexus IS300 is a rear-wheel drive, compact luxury sports sedan manufactured by the Toyota Motor Corp. under the Lexus brand and originally sold as the Toyota Altezza in Japan. The model was introduced to slot below the ES in the Lexus lineup and to compete against the BMW 3 Series and the Nissan Skyline/Infiniti G. The first-generation Altezza (codename XE10) was launched in Japan in October 1998, while the Lexus IS200 made its debut in Europe in 1999 and the IS300 in North America in 2001. The "IS" stands for "Intelligent Sport. The 2JZ-GE powered IS series engine, although not as popular as it's turbocharged (2JZ-GTE) brother, is a 3.0 liter inline six cylinder, mounted longitudinally and, unlike the 2JZ-GTE, features Variable Valve Timing with intelligence (VVT-i) on the intake camshaft which provides both improved low-end torque and high rpm horsepower. Also fits the 1998-2005 2nd generation Lexus GS300 (Toyota Aristo)

(Off BC's website)



Cams

Street/Strip Specification
Plug and play application. Short duration for nice street manners, slight lope at idle. Excellent all purpose spec. OEM spring OK. Shimmed to tight side of OEM. 264's run as reliable on stock ECU as stock cams on stock ECU.

Stage2
Part#BC0311 Adv. Dur. 264°/264° Dur @ .050 218°/218° Lift (in).344"/.344" Lift (mm)8.74/8.74


Race Specification
Longer duration profile, added rpm potential. Intended for fully built engine. Tuning and ECU mods recommended. Requires upgraded valve springs and retainers.

Stage3
Part#BC0312 Adv. Dur.272°/272° Dur @ .050 229°/231° Lift (in).375"/.380" Lift (mm) 9.52/9.65



2JZGE (Lexus IS300) Stock Adv. Dur.248°/248° Dur @ .050 200°/194° Lift (in).337"/.327" Lift(in)8.56/8.31

BC Valve Springs and Retainers

2JZGE Valve Spring & Retainer Kits
Designed for high rpm, BC valve springs are wound from only the highest grade, super clean, chrome silicone alloy and feature proprietary processing procedures for consistent pressures. BC titanium retainers are CNC machined from 6AL4V round bar titanium to exacting tolerances.

BC Valves

2JZGE Stainless Steel Valves
BC valves are one piece design with a friction welded Stellite tip for the best possible performance. Every valve is made from premium grade, heat resistant stainless steel material to insure reliability with high boost and/or high rpm applications. The undercut stem above the head area not only reduces overall weight for extended rpm potential, but also significantly improves air/fuel flow in and out of the combustion chamber. Every valve is fully machined and features a swirl polished finish under the head.


Specs for valve clearance:
Intake Measurment- .006"-.010"
Exhaust Measurement- .010".014"

* Spec clearances to tight side of OEM spec (when re shimming)

Here is a list of part numbers with shim thickness:

13753-74010 T= 2.50mm (0.0984")
13753-74030 T= 2.55mm (0.1004")
13753-74050 T= 2.60mm (0.1024")
13753-74070 T= 2.70mm (0.1043")
13753-74090 T= 2.70mm (0.1063")
13753-74110 T= 2.75mm (0.1083")
13753-74130 T= 2.80mm (0.1102")
13753-74150 T= 2.85mm (0.1122")
13753-74170 T= 2.90mm (0.1142")
13753-74190 T= 2.95mm (0.1161")
13753-74210 T= 3.00mm (0.1181")
13753-74230 T= 3.05mm (0.1201")
13753-74250 T= 3.10mm (0.1220")
13753-74270 T= 3.15mm (0.1240")
13753-74290 T= 3.20mm (0.1260")
13753-74310 T= 3.25mm (0.1280")
13753-74330 T= 3.30mm (0.1300")
Thanks Leonard_IS300 for info^^

CAM GEARS

http://my.is/forums/f88/exhaust-cam-gears-trying-understand-402528/index5.html
http://my.is/forums/f221/diy-cam-gear-install-383203/
Good info on cam gear settings
http://my.is/forums/f88/dyno-results-bc264s-adj-cam-gears-7-pulls-426313/

BC is Coming out with BC8830 - 2JZ/1JZ Cam Gears - 03/2013

Related Threads.....

http://my.is/forums/f88/bc-cam-install-466417/index8.html

http://my.is/forums/f88/brian-crowe...al-owner-experiences-faq-mild-nws-p13-383241/

http://my.is/forums/f88/dyno-results-bc264s-adj-cam-gears-7-pulls-426313/

http://my.is/forums/f88/buying-bc-264-cams-new-video-page-7-a-436951/

Head Flow
http://www.supramania.com/forums/showthread.php?99476-Supra-Head-Flow-(5M-7M-1JZ-2JZGE-2JZGTE)
http://www.clublexus.com/forums/florida-lexus-club/527615-head-flow-results.html









BC valve vs OEM valve

BC valve springs and retainer vs. OEM




Cam Gear install
http://my.is/forums/f221/diy-cam-gear-install-383203/

Videos
Servicing 2JZ Videos
#1

#2

#3

#4

#5


264s








272s







More coming soon..............
 
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#6 · (Edited)
Y split towards the rear (might have to remove spare tire well)....With SC i wouldn't worry about back pressure not needed , all i have is a rear muffler full 3in exhaust and mazzuri w/custom 3in y pipe ....just send him a PM he'll give you all the info you need hes a great guy ,his screen name is edgy ....
 
#7 ·
Yeah Edgy is coo as hail!! for real nice dude glad i finally found him...i was wondering who's IS i fell in Love with at first sight!! the sound is like a rare diamond in the rough and she looks so fresh so clean so mean! Whats goin on though Bezik!?! Nice 2 hear from you Battle!
 
#9 ·
So I've heard conflicting reports about needing to reshim the lifters after doing BC cams.

It sounds like the early cams needed every lifter to be reshimmed, and the newer ones require one or two, if that to be reshimmed.

Did BC change the cams early vs late? Can anyone clarify what I've found?
 
#14 ·
Early cams had a smaller base circle diameter, thus needing all new shims everywhere. The newer cams use the OEM base circle, so you are likely ok with the shims you have. I had to move 4 of mine around, but wound up with perfect lash.

Additionally, during the ECU re-learn (battery was disconnected) I had a rough idle, and threw intermittent/random misfire codes, and specific cylinder misfire codes. Once the ECU relearned, the idle smoothed out and the misfire codes went away.
 
#10 ·
Have not heard , but any time you change cams (any)and durations every clearance needs to be checked and changed as need be . Note every engine is different , shims and clearance will always differ.
 
#13 ·
#22 ·
I can say from my own experience YES . They are lighter , precision made, and really help rpm travel mid to higher rpm levels . To me cams alone vs fully built head with everything BC .... Felt better with BC valves

* you will need to pull head to do valves
 
#26 ·
where to download said manual?

everything in the install seems pretty straight forward, its just measuring clearance and the re-shimming part that has me confused. :confused:

If someone could just post ONE picture of what exactly is to be measured, and label it with a few arrows on paint,

and then what exactly needs to be done for re-shimming.

noob questions i know, but im sure others are wondering the same thing
 
#27 ·
As am I!
 
#28 · (Edited)
Sulaman, LazyIS and willemkent.... I think the measurement you are confused about is the lash/clearance. The lash is measured between the cam and the top of the shim when each valve's respective lobe is facing perpendicular (straight up, aka the heel of the cam lobe) from the surface of the shim.

These next links show where you should be measuring: between the heel of the cam lobe and the top of the shims. Notice, NONE of the links below are specific to the IS300 2JZGE however, the concept should be the same. I would have just inserted pictures but I don't feel like dealing with copyright ANYTHING so I copied the links.

Nissan Rb26dett Shimming Valves Photo 20
Quick valve clearance question - SV650.org - SV650 & Gladius 650 Forum - the post by JAMBO
Checking Valve Clearance - the 2nd picture down

This link shows what OUR buckets/shims should look like. The shim seems pretty easy to get to and measure with the cams uninstalled.

Pics: How to shim your valves

The IS300 owners manual designates special tools to be able to remove the shims with the cams installed however, leonardIS300 who I consider to be a GOD on this forum, advises not moving shims around with the cams installed and he has done them enough times to know. You can see specifically what he has to say about this by following this link:
http://my.is/forums/f88/brian-crowe...eriences-faq-mild-nws-p13-383241/index56.html
 
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