2T Single Cam upgrade help

**king-szeitszam** · 25-07-2011, 11:16 PM

Absolutely!!!! Throw on a nice set of extractors and you'll have a sweet little engine.

Once again, I would strongly suggest TAKE IT TO ANOTHER TUNER AND AT THE VERY LEAST GET A SECOND OPINION!

I'll make these a priority. Second opinion, re-jet to smaller jets if possible, re tune with new tuner.

The amount of fuel required by an engine is directly proportional to airflow which equals power. A petrol engine by its nature has it's power controlled by limiting airflow, and then metering fuel according to that airflow. To tune the engine you jet the carbs to suit the airflow of the engine, not the other way around.

So something like a cold air intake or ram-tubes to increase air intake velocity would be a better idea than a camshaft modification by this logic? Better airflow=better economy?

Also- I have read through a lot of what River and Jason posted up tonight r.e. tuning these things myself. I know that by no means anything I do will be a permanent fix, but if I do it right then it should put a little less fuel through for the time being, until it gets re tuned.

I do however feel that if the jets haven't been replaced then this would be the place to start.

Sounds like a consensus to me. Bugger the cam for the moment, i'll have the carbs fitted with smaller jets and maybe look into air intake if it's suggested in following replies... (?)
Thoughts on that anyone?

One other thing I pointed out to ks and was not sure of myself. The twins fuel rail does not have a return line. Could this also be causing the problem? The floats seat well and there is no fuel bypassing when the elec fuel pump is on and car not running though

YES- major concern for me here, I would like to know also if this could be causing the problem..no way for excess fuel to flow back into the tank. ???

P s k s phone went dead sorry haven't had a chance to reply.

No worries mate! I'll get back to you r.e the clutch business when i've had a look into it.
Also modified suspension a little bit with rubber spacers to lift it up a half inch more- works a charm. Didn't want to roll or cut guards as it may crack paint or compromise strength.

**Hurricane** · 25-07-2011, 11:31 PM

i dont see swapping to a 2tg as a thing u need to do.
ive ran stock 2tg twins on a stock 2tc with out any issue and 18rg twins on a stock 3tc both with out tunning the carby, just in stock form.

my 3tc mild build in my ke20 thread (link in my sig) got me a weeks driving (60plus ks a day to work and back) out of the 40 litre tank in the ke20 and that had more work and was not build to save me fuel and money. that was on 18rg carbys un-tuned.

so im sure if tuned/jeted/setup correctly the 2tg carby should work fine on your 2tc if the motor its self is fine.

a mild cam doesnt need any thing changed to work apart from refacing the lifters and adding some more timing in a t series motor from my playing with them. but uprated or new OME valve springs can be a good thing to do (but not needed).

what pressure is your pump running at? over or under 4psi

on my setup i ran a stock 3tc pump and no return, just a T peice between the carbys and ran the fuel line into that.

Note that the 2tc came with two pumps, one with a retuun off the pump and one with out (return on the carby) were was your return line from? if u know

**lt1972** · 25-07-2011, 11:58 PM

Return for ks original carbies was reduction orifice off the carby. Fuel pump installed is supposed to be sub 4psi. Havent had a pres gauge on it though to check as the pressure gauge is installed on the 2tgeu that was remobed from the car when ks bought it.

**king-szeitszam** · 26-07-2011, 12:19 AM

Originally Posted by lt1972

Return for ks original carbies was reduction orifice off the carby. Fuel pump installed is supposed to be sub 4psi. Havent had a pres gauge on it though to check as the pressure gauge is installed on the 2tgeu that was remobed from the car when ks bought it.

Knew you had that one covered A

Hurricane- from what has been said on here so far- it sounds like the cam will not solve too much in terms of fuel usage.
Like boxhead said before- I can change the whole purpose of the motor by putting a cam in because of high fuel flow
Or I can simply lower the fuel flow.

Should I be looking at things like ram tubes and cold air intakes in conjuntion with re jetting carbies??

Ps in terms of the cam, if I was to do it I wouldn't half ass it. New trd double springs, valves, cam followers, lifters etc.
Not looking like there'd be much point in doing it anyway. I drive the thing to and from work..not on a racetrack.

**boxh34d** · 26-07-2011, 06:43 PM

I think you mis interpreted my statement about air velocity. Only really a problem when carbs are way way to big - eg, twin 52mm's on a stock 1600 cc engine etc, with the point being that this won't be your problem.

**king-szeitszam** · 26-07-2011, 11:08 PM

Originally Posted by boxh34d

I think you mis interpreted my statement about air velocity. Only really a problem when carbs are way way to big - eg, twin 52mm's on a stock 1600 cc engine etc, with the point being that this won't be your problem.

I'm with you now, heard and understood.
Will make it my priority to have a look into the carbs as you suggested, and take it to another tuner -.-

Can you see any benefit coming out of ram-tubes for instance?