2tg head flows

[metcap]

Just wanted to know if somebody can point out where to find 2tg head flows particularly for the 222 head. What's the max flow numbers for a 222 with the big intake and exhaust valve mods?

[J-M kujala]

http://www.toymods.org.au/forums/tec...ies-heads.html

there is topic to head flows... not far..

[MorGo]

All 2T-G heads flow practically same (well,the early -220 with 43 mm valves of course is different)
What comes to big valve mods there is right away the question what cam lift there is and what's the intended peak power rpm..
That makes big difference to design;big valve head could be done just stock engine or it can be screaming monster.They don't have same head despite the big valves.

[metcap]

thanks for the flow thread

how critical would a big head flow number (ie ported, big valves and hi cams) be for a turbo setup? Hi velocity port stuff more for NA s?

[MorGo]

Well,think it that way:the better the "base" engine is the less you need boost to make great numbers.
Remember that the boost is only multiplier;85 hp engine don't make 500 hp even with 3 bar..
But make 200 hp NA engine,drop a comp a little and add 1 bar:400 hp instant (of course considering that all parts are up to task)

When you can make power with less boost the easier it comes! Less boost means turbine makes less backpressure,compressor usually works more efficiently,less boost means cooler compressor output=less work for intercooler...
It's win-win case.ALWAYS make the engine rock before turboing it!
Or do it like factorys.. factory turbos are very inspiring aren't they?

[toyota1515]

NO, i disagree with you bro!
You got a very wrong perspective of it buddy, let me tell you, i tough the same before but i was wrong you cant make 200 hp on a 8.5 compression ratio, on any 2tg and with the cams set up for turbo, if you are lucky you can baerly reach 120 at its best and yes you can make not 400 but more than 500,

FYI, head portings are different, for each different application, and one dont work with the other!

Think about it like it is a combination to achieve a goal,
Every built need to be specifcally combine for what is intended, regardless if is going to be Turbo, N/A or Supercharged

[metcap]

ok so whats the best type of porting work to be done on the 2tg head for a turbo setup?? Hi velocity charge port or should it be for all out maximum flow?

[J-M kujala]

ok so whats the best type of porting work to be done on the 2tg head for a turbo setup?? Hi velocity charge port or should it be for all out maximum flow?

Depends at other setup. and what you want.. torgue and HP target... at least mild porting without making the port bigger, just good shape.. with harder cams etc / start to design engine what is wanted.. whats the correct port size, what cams and lift going to used to get target... just combination...

But make 200 hp NA engine,drop a comp a little and add 1 bar:400 hp instant (of course considering that all parts are up to task)

When you can make power with less boost the easier it comes! Less boost means turbine makes less backpressure,compressor usually works more efficiently,less boost means cooler compressor output=less work for intercooler...
It's win-win case.ALWAYS make the engine rock before turboing it!

Or do it like factorys.. factory turbos are very inspiring aren't they?

So true that can be...

NO, i disagree with you bro!
You got a very wrong perspective of it buddy, let me tell you, i tough the same before but i was wrong you cant make 200 hp on a 8.5 compression ratio

I think you not get the pont at Morgos Texts... design the engine, then drop CR and tune it, like cam lobe and ignition... the power comes out with multiplier as a N/A if everything done correct

Make the engine, like 160 Hp N/A 2TG with 3T Bottom (streetable) then drop compression to good level to turboing it, then add like 1 bar boost and tune cams and fuel maps and ignition.. with well designed parts and with correct turbo, it will make 320 hp / 1 bar boost.

Before i got 2TG with just cleaned ports, 11.5 C/R pistons (87mm), 3T Crank, 270 Cams, 40 mm Sidedrafts with 36mm venturies... 158 crank HP and 200nm + torgue..
Turboing it later, change pistons to 87mm flat ones, install airbox/cooler/Garrett RS500 turbo/etc parts needed. 327 Hp / 437 Nm / 1 Bar boost ~15 Psi

if have stock 3TC with nothing done, it is ~100hp engine with good intake. then drop compression down to correct level where the boost target is.
To pushing out ~300 hp you need like about ~2 bar boost. (stock head and cam limiting power)


To making 800 hp 3TC usually needed approx 45 Psi Boost then "base" engine is near 200Hp, when exhaust manifold, cam angle (open) and timing (same profile), ignition timing and Compression ratio is raised to be as a correct level to that "boost" what is 0Psi in N/A but yes, boosted engine just with removed turbo and nothing done and tuned, that boosted engine hp without turbo is maybe like 100Hp

[toyota1515]

LOL ok so now every time we want to build a nice turbo motor we need to make it n/a first to squezze the best of it to then change pistons and cam profile to achieve a good turbo motor? Buuaaahahahahahaha!

[J-M kujala]

LOL ok so now every time we want to build a nice turbo motor we need to make it n/a first to squezze the best of it to then change pistons and cam profile to achieve a good turbo motor? Buuaaahahahahahaha!

Now im SURE you doesnt UNDERSTAND the point...
No one need to BUILT it in real life.. only desing it to work together.. cam,head,intake lenghts, pulses...

my own old engine what i tell, was for example, because use it years before convert it to a turbo..



PS: and no one speak changing the cam lobes / profiles.... just timing

[toyota1515]

WOW cant you spot a sarcasm comment from a real one?
I am having fun with you, you are not getting the point?

Looks like you are the one not getting the point, why you didnt quote my whole comment and just take it out of context to just criticize me as you please, cool i see where you coming from Kulele!

[toyota1515]

By the way if you are converting to turbo, lowering compression ratio and not changing cam profiles you are wasting your time!

[J-M kujala]

LOL

If you buy NA or turbo 284 cams to 2tg, same profile/cams in same manufacturer.. different timings.... In 3TC had to make turbo cam because cam center angle cant move withput change the cam..

2TG is easy to test cams.. If got them enough ;-) got huge bucket of them..

[toyota1515]

I never use of the shelf cams in my builds i always get custom grinds with my own personal specs for any 3TC motor i built.

A combination of duration and lift for a n/a is never to be used on a turbo motor, it wont work,

You may said i did it before and it works great, but in reality you are just leaving like 30% of the horsepower you can produce behind cuz the cam profile, no matter how well you can adjust the lobe center separation on the twin cam, lol no wonder we made twice the hp with the inferior engine head hahahhaaa.

You gonna need to dig deep in you bucket but i dont think you will find a cam that really wake up your motor.

[metcap]

I think we should just take a step back and cool down on some of the bickering, I'm sure majority of the ppl here surf forums just to learn more about their passion on cars and stuff. I for one dun expect to be able to build a car which just lives on the quarter doing 8s everyday. A shouting match dun help anyone here so I lets not continue with it, naturally braggin rights goes with whoever's on top of the game so just give credits due and move on.