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KaosAD
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June 2002
3T head on a 2T engine? Fri, 21 June 2002 02:43 Go to next message
I was just wondering if anybody knows whether or not a 3T head will fit on a 2T engine.
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celicamad85
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Re: 3T head on a 2T engine? Fri, 21 June 2002 07:26 Go to previous messageGo to next message
it will but it will lower your compression slightly, apparently the 2t block has a high compression anyway so it shouldnt matter much
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KaosAD
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Re: 3T head on a 2T engine? Sun, 23 June 2002 14:12 Go to previous messageGo to next message
Should i then get the head shaved to up the compression back close to normal - is the different head any better? is there any manifold problems associated?
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Malkomv2.0
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Re: 3T head on a 2T engine? Mon, 24 June 2002 08:22 Go to previous messageGo to next message
This topic was covered many times in the old forums. The outcome to the best of my knowledge was that the 2t has dome top pistons hence a larger combustion chamber. The 3t has almost flat tops with only a 4-5mm raise in the crown, hence a smaller combustion chamber. People put 2t heads on stock 3t bottom ends and it gives around 7.8:1. Great for turbos.
So you would be raising your compression. I would want to be very careful about the piston to valve clearence.
I have a spare 3t head in my shed and it needs a lot of work. If you are going to do this, get the die grinder out and fix up all of the factory casting marks, and raise up the roof of the exaust ports. The valve guides could also do with some machineing around the base.
Good luck, but why the drama, just get a twincam.
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celicamad85
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Re: 3T head on a 2T engine? Mon, 24 June 2002 09:03 Go to previous messageGo to next message
depends on what you want to do with it i guess, classique_71 aka stuart has a worked 2t motor which sounds quite nice and puts out a lot of power, he also can bring the front wheel off the ground whilst driving if he gives it a bit of gas
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Jonny2TG
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Re: 3T head on a 2T engine? Mon, 24 June 2002 13:23 Go to previous messageGo to next message
Well does anyone have good figures on the combustion area of these engines? Someone please measure?

This is what I have written down, but I don't know where it comes from or if its correct or not:

3T and some 2T's = 68cc
2TG head = 62cc
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KaosAD
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Re: 3T head on a 2T engine? Tue, 25 June 2002 02:37 Go to previous messageGo to next message
mabee it would be easier if i just found someone with a 2T head so i can just get the shit ported out of that and use it. Solve a lot of probs!

Anyone got a 2T head they want to part with?

[Updated on: Tue, 25 June 2002 02:39]

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Jonny2TG
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Re: 3T head on a 2T engine? Tue, 25 June 2002 04:42 Go to previous messageGo to next message
yes, I have a 2T head that Im not using right now. Im in Hobart.
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Jonny2TG
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Re: 3T head on a 2T engine? Tue, 25 June 2002 04:44 Go to previous messageGo to next message
I will cc that head as well right? How do I do it. Seal the valves with grease, put water in it with a seringe?
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Malkomv2.0
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Re: 3T head on a 2T engine? Tue, 25 June 2002 07:11 Go to previous messageGo to next message
Oil Johnny, oil. Use a peice of perspex to cover the chamber and drill a hole in it. Seal with vas or grease or whatever and fill with light oil.
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Classique71
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Re: 3T head on a 2T engine? Fri, 28 June 2002 03:59 Go to previous messageGo to next message
celicamad85 wrote on Mon, 24 June 2002 7:03 PM

depends on what you want to do with it i guess, classique_71 aka stuart has a worked 2t motor which sounds quite nice and puts out a lot of power, he also can bring the front wheel off the ground whilst driving if he gives it a bit of gas


Heheh - its a 2T-B for starters Smile

and it used to lift the wheels up in the ta40 it came out of * chuckles * That was also when it had the superwild racing cam in it that made the motor insanely powerful for a non turbo 2T
( 185hp at the fly + about 112hp at rears, 9800rpm limit = INSANE)

Now it just sort of pawwiggles ( ie lifts front up enough to wiggle it ) the left hand tyre in the ta22 because if the bodyflex and its back on stock cam - milder cam goes in ASAP After dyno day

Strut brace and a lighter foot would stop this Smile

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KaosAD
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Re: 3T head on a 2T engine? Fri, 28 June 2002 05:47 Go to previous messageGo to next message
how much effort does it take to make a 2T go that hard?

Can it be done at all?

Is porting an polishing the head and getting a new cam help?
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Classique71
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Re: 3T head on a 2T engine? Fri, 28 June 2002 06:31 Go to previous messageGo to next message
the head on mines been worked over a fair bit - porting , polishing , larger valves - hardened springs etc - just about everythings stronger than it should , and flows better than a stock 2t head

bottom end wise i have high compression forged pistons , balanced crank - its been rebored , and theres a lightened flywheel hangign off the back end

Ive seen the engine dyno figures for this motor and im not joking when i say it is a lurking monster - the racing cam made most of the difference though - it was basically undrivable below 2500 rpm - after that thouygh - there was no stopping it ..

I had it removed cause vicroads deemed it " illegal " when i went to get the car registered..

The rebuild cost the guy i bought it from just over $2500 to do - including cam + special Pistons from the USA

As a footnote 2T's are VERY good motors - I know of a few that currently exceed the 170HP mark and are regular street drivers - and i know of guys in the states using 3t Blocks as Drag motors that put out way over the 300 HP mark with turbo setups.

Its the carby + cam that lets them down in my oppinion - Im running a single 45MM weber on mine at the moment - and its made a world of difference to the way the car goes

As a second footnote - As before i know my engines capable of over 100HP at the wheels on paper - and i have a good contender in my hands to take on Tina TRy's 2tgeu celica as unofficial toymods current under 1800cc Dyno champ. We have a dyno day in QLD coming up shortly - which will give me a very good idea how far Im off beating her marks and what cam profile i need to look at to do so when i go to order my new camshaft

Anyway /end rant
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Classique71
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Re: 3T head on a 2T engine? Fri, 28 June 2002 13:57 Go to previous message
heh - on the topic of dyno champ - i had a cha to one of the guys at our club who owns "oomph" a show ta22 .. Hes running a mildly cammed 2tgeu - so i asked him "oh whats yours producing" - he said " oh about 110 at the rears" - So - we have an "unofficial" beater already Razz

its a VERY nice piece of machnery too - something id like to inspire too if i had the dollarz Wink Nod

Stuart
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