ndk83

Ok so i have an 2nd gen IS300, and i have been trying to figure out which car's engine mine is based off of. Many of my car's parts are shared between the IS250 and IS350 cars. Obviously i can get the part no. for the IS300's so im asking you guys for help with part nos for the IS250 and IS350 models.

My Questions this, What parts of the 250's engines would/should be the same from the 350's?? Im mainly talkin about the parts that will pertain to the headers more than anything else.

IS350 and IS250 same the share header part number which i find kinda strange. Does that mean the exhaust port on the engine that the headers connect to will be the same? ( can anyone provide me with that part number for this on the250 and 350?)

Would the cylinder block be different? Can someone provide me with the part number(s --if different)

Camshafts adn the double over head cams will they be the same for all engines, correct?

If ive missed important parts of the engine design with relation the headers or each other pls fill me in.

I know ive simplified the schit out of a very complicated engine, but im a beginner at this stuff and im trying to figure out which engine is closest to mine and which header design would work better on my car.

If any of you guys can help me out that would be great. I know this is a question mainly for Lobuxracer and Carchitect ad all the technical guys, but pls anyone and everyone feel free to pitch in. JavyLSU i know you got access to part numbers so pls help me out in this regard. This will be a lesson for me on the GR engines and engines in general. Thanks in advance


Just for ref.

The Toyota GR engine family is an open-deck, die-cast V6 piston engine series. The GR series has a 60° aluminum block and aluminum DOHC cylinder heads. Some versions use MFI fuel injection, some have direct gasoline injection, and some have a combination of direct injection and MFI. This engine series also has 4 valves per cylinder, features forged steel connecting rods, one-piece cast camshafts, and a cast aluminum lower intake manifold



IS350
The 2GR-FSE Bore is 94 mm and stroke is reduced to 83 mm (?). The 2GR-FSe engine used in the Lexus IS 350 incorporates Toyota's D4-S twin injection system. This system combines gasoline direct injection with traditional port injection. The 2GR-FSE engine is rated at 315 PS (311 hp/232 kW) at 6,400 RPM and 38.4 kg·m (377 N·m/278 ft·lbf) at 4,800 RPM.
Compression ratio: 11.8:1

IS300
The 3GR-FE is a 3.0 L (2994 cc) version with dual VVT-i. Bore is 87.5 mm while stroke is shared with the 2GR at 83 mm. Output is 228 hp (170 kW) at 6400 rpm, and 221 lb·ft (300 N·m) of torque at 4800 rpm.
Compression ratio 10.5:1 ???

IS250
The 4GR-FSE is a 2.5 L (2499 cc) version. Bore is 83.1 mm while stroke is reduced to 76.9 mm. Output is 215 PS (212 hp/158 kW) at 6,400 RPM and 26.5 kg·m (260 N·m/192 ft·lbf) at 3,800 RPM. This version also features "dual-VVT-i", variable valve timing on both the intake and exhaust cams and gasoline direct injection.
Compression ratio: 12.0:1

Rash

iTrader: (1)

the only thing I know is, we have the 3rd Gen GS300 engine cover lol.

ndk83

^^haha

anyone else?

part nos is350/250:

1. exhaust port on engine.
2.cylinder block ( i know pistons are diff but since the exhaust port size maybe the same maybe the block is too)
3.camshafts

ndk83

Here is a pic to illustrate which part im takling about, it looks like the exhaust/headers attach to the cylinder block (not sure, am a newbie, someone pls help me out) Any one know what the part is called?

RTIS250

iTrader: (9)

The headers (exhaust manifolds) attatch to the cylinder heads (not block). The cylinder heads attatch to the block. I highly doubt the cams are the same specs, considering each engine has its own intake/exhaust needs. Almost nothing is the same between the engines (i should say, nothing is interchangable, but everything shares a common design). The blocks, cams, pistons, rods, crank, intake, etc are all different. The exhaust manifolds may be the same only because the external dimensions of the engines are identical.

ndk83

hmmm, makes sense i guess everythnig was designed sized to work specificly to each engine size.

but im confused the external dimensions of the engines cylinder head are the same but internals dimensions of the cylinder head are diff then? wouldnt the external dimension of the engine be the cylinder block and the cylinder head?
Can someome pls provide either drawings or the part numbers for the IS350/250 and if possible the Gs300 (3rd gne with the 3gr-fse engine) heads and blocks?

so if the exhaust opening for the exhaust manifold are on the cylinder heads correct? why would they design diff cylinder heads and then make the holes the same size ? does the hole not make a difference in performance of the exhaust leaving the engine??

ndk83

I know this isnt the most interesteing thread and the questions are clear noob questions but would someone pls help out with part nos?

This would be a huge help to US IS300 peeps who wanna mod

Kurtz

iTrader: (1)

For $10 you can access TIS for a day (I think you can get like 47 hours if you time it right)

https://techinfo.toyota.com/techInfo....toyota.com%2F

Should have more part #s than you can shake a stick at

ndk83

yea didnt was hoping i wouldnt have to resort to that but eff it i guess its only 10 bucks. Ill post up once i get it done. hopefully ill be able to print everything out