Official IS300 Cam/Head Thread - Lexus IS Forum
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post #1 of 88 (permalink) Old 02-08-2012, 04:17 PM Thread Starter
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Official IS300 Cam/Head Thread

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

Exhaust Cam Gears... Trying To Understand
DIY Cam Gear Install
Good info on cam gear settings
Dyno results for BC264s and adj Cam gears (7 pulls)

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

Related Threads.....

BC cam install

Brian Crower Cams-What you can expect (official owner experiences FAQ) Mild NWS p13

Dyno results for BC264s and adj Cam gears (7 pulls)

http://my.is/forums/f88/buying-bc-26...ge-7-a-436951/

Head Flow
http://www.supramania.com/forums/sho...Z-2JZGE-2JZGTE)
http://www.clublexus.com/forums/flor...w-results.html









BC valve vs OEM valve

BC valve springs and retainer vs. OEM




Cam Gear install
DIY Cam Gear Install

Videos
Servicing 2JZ Videos
#1
#2
#3
#4
#5

264s


272s




More coming soon..............

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Last edited by Bezik777; 12-15-2013 at 07:11 AM. Reason: updated again
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post #2 of 88 (permalink) Old 02-08-2012, 04:40 PM
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Good shit Tom. Can't wait for more info. This threads gonna be a big help when I'm ready to get cams.

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post #3 of 88 (permalink) Old 02-08-2012, 05:59 PM
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Something tells me I added the flint for the spark for this thread...

Information came from Leonard. Asset to community.
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post #4 of 88 (permalink) Old 03-26-2012, 05:57 PM Thread Starter
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Thanks guys , thread has been updated and opened .......

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post #5 of 88 (permalink) Old 05-01-2012, 11:41 AM
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i been looking at that Raptor V Supercharged IS for a minute now....how did he do that custom exhaust? do you think there are some specs on it somewhere? would you lose back pressure doing an exhaust like that??
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post #6 of 88 (permalink) Old 05-01-2012, 07:11 PM Thread Starter
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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 ....

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Last edited by Bezik777; 05-01-2012 at 07:19 PM.
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post #7 of 88 (permalink) Old 05-02-2012, 11:22 AM
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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!
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post #8 of 88 (permalink) Old 05-10-2012, 05:21 PM Thread Starter
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Quote:
Originally Posted by LucciLou View Post
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!
Yes he is ....Not much Just training soldiers and trying to get my car done , but of late just been buying alot of parts lol ....check out my build thread..

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post #9 of 88 (permalink) Old 05-17-2012, 02:29 PM
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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?

2002 MSM IS300 - 5MT with LSD
BC 264 // Titan Cam Gear // Eibach Prokit & Bilsteins // Figs CDDD, #1 & #2 LCA bushings
"Trac off" is clearly just Japanese for "Sideways on"
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post #10 of 88 (permalink) Old 05-17-2012, 03:14 PM Thread Starter
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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.

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post #11 of 88 (permalink) Old 05-21-2012, 02:28 PM
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im still confused. do the ge heads have better flow than the gte's?
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From what I have heard yes the GE head flows better stock for stock.

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post #13 of 88 (permalink) Old 07-06-2012, 01:19 PM
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Quote:
Originally Posted by son-of-an-IS View Post
im still confused. do the ge heads have better flow than the gte's?
Quote:
Originally Posted by leonard_is300 View Post
From what I have heard yes the GE head flows better stock for stock.
(I know this thread isn't recent, but info should always be shared where available, even though this info appears in other threads on my.is)

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post #14 of 88 (permalink) Old 07-09-2012, 11:12 PM
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Quote:
Originally Posted by Tire_Marx View Post
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?
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.

2002 MSM IS300 - 5MT with LSD
BC 264 // Titan Cam Gear // Eibach Prokit & Bilsteins // Figs CDDD, #1 & #2 LCA bushings
"Trac off" is clearly just Japanese for "Sideways on"
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post #15 of 88 (permalink) Old 07-10-2012, 05:43 AM Thread Starter
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Don't ever assume you dont have to check clearances ! Always check and adjust

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