2tg proven regrind cam specs....

[shelldrake]

Hey guys,
Currently have the trd 288/304 cams in my hybrid. They work pretty well overall, but seem to stop producing power after 6500rpm. Has anyone got any specs on cams which have proven to work very well on their modified 2tg/18rgs? Any info on lift/duration combos would be much appreciated as I intend on getting a spare set ground up. Much appreciated!

[oldcorollas]

288/304 should be going well over 6500??? shouldn't that be capable of 8Krpm or so?
are they way out of whack with regards to their timing?
is your fuel/advance out?
intake or exhaust restricting it?

[rolleraction]

I'm with OC here. That combo should rev like there's no tomorrow...?

[celicapain]

I'm with OC here. That combo should rev like there's no tomorrow...?

yeah i would pick that spec cam to start MAKING power at 6500, not to run out of puff. ya timing must be up da shit

[oldcorollas]

then again..
toysport say this

For the Full Race set-up use 320 intake and 304 cams. For the Rally set-up use 304 /288 or 304/272 cams. For the Street racer, the 304/304 set-up is very streetable and have a nice mild lobe at idle.

i wouldn't have thought 304 could be considered streetable

and another perspective
http://www.rollaclub.com/board/lofiv...hp/t12540.html

From my TRD parts catologue it has the following:

2TG Street / Track intake Cam Pt # 13501-TA051
Power band 3000-7500 rpm
Duration 304 Deg - 10mm lift

2TG Street / Track Exhaust Cam Pt# 13502-TA052
Power Band 4200-8000rpm
Duration 288 Deg - 9.6mm lift.

I have two sets of the above cams and have run them over many engines. Good for a 2ltr engine as long as it can breath with a good porting job. Have yet to try a 304 inlet with 304 exhaust as cams are interchangeable (both 2TG + 18 RG). The book says it is for track only.
Hope this is what you needed.
DMC

so i guess the question is.. are the cams dialled in properly? and do you have good timing, and enough air?

[w810sc]

shelldrake, i dont know how well these go, but i will find out soon when my head comes back from the machinest. This is what is written on the cam profile cards:

Crankshaft Engineering Company
(08) 9444 7022

Intake Shaft:
code no. 2507
clearance hot: .010"
cam lift: .375"
duration: (missing on card)
base circle undersize: (missing on card)

Exhaust Shaft:
code no. 2488
clearance hot: .010"
cam lift: .410"
duration: 304 degrees
base circle undersize: (missing on card)

fonzy

[Celica RA45]

you could try 1 of my grinds 435thou lift and about 262 at 50 thou and on the exhaust 395 thou 255 at 50 thou that should make power to 8500 rpm but it depends on how you set them up also your exhaust headers has a lot to do with where it starts and when it finishes in the power band ,same with overall inlet track

[shelldrake]

The distributor is full mechanical advance now - 12 at idle, about 30 max.

Extractors are pacemaker 4-2-1s, with a 2.25 mandrel bent.(Hotdog in the middle with a free flow on the back)

The cams were dialled in according to specs provided by machinist.

Has twin 45 webers, with size 36 chokes - Trumpets and socks - stock 2tg inlet manifold match ported to head. head has also been race ported. Has double valve springs and the later, larger valves.

Apparently pulled 96rwkw at 6500, when I go above this power drops off and things get shaky... Will find the rest of my specs and compare to what you guys have here. It is a hybrid (3t crank), so I may be getting limited by stroke...Having said that - Turdinator of these forums can pull to 7 cleanly.

[71TA22]

Are you running the factory fuel pump?

My 2TG on standard factory cams and 260 head ran the same till I tried an electric fuel pump. After that I could run into the red zone easy.

Not enough juice getting through..

[Celica RA45]

what comp ratio have you got ,it just strange ,with 3t pistons and fly cut pistons should be about 10,5 to 1 and timming should be about 5 degress at tdc with this much comp ,also your inlet sounds like it might be to far advanced ,next question when you had it dynoed did the guy check your tacho with his also agianst the speed measure as well ,as every time i go to the same dyno we check the tacho and also the speed to make sure its right .as in what you are saying at 6400 could be really 6900 rpm
last question are you sure the cams are not back to front as i know clive did put the inlet profile on the exhaust once and vice a versa

[shelldrake]

Running an electric fuel pump with a malpassi regulator set to 3.5-4 psi.

These are that particular set, that were ground back to front. I will have to check out the cams back to front thing, I believe they are set up in the same configuration as Steve set them up to.

Interesting thought on checking the tacho reading. Will have to suss that out.