2tg/3t hybrid

[Born-Enthusiast]

hey guys im 19 n just discovering the wonders of toyots SO much better then ford's and holdens i got a ta22 and i do all the work on it myself at the mo im building a 2tg 3t hybrid trying to get a reasonable amount of power out of it to nothing over the top im not stupid. i am wondering what you would recomend as a good compression ratio though. i heard 10.5:1 was a good one from reading previous posts but did you know the actuall power output at that ratio any help on this would be great cheers

[Hokey]

When building these engines just using stock 3T pistons and a unshaved head you will get around the compression ratio. most hybrids seem to make around 75rwkw.
hope this helps,
Calvin

[Celica RA45]

but make sure you fly cut your pistons so the valves wont hit the pistons and if you a running hotter cams give it deeper mainly inlet for longer duration cams

[Born-Enthusiast]

cheers i was going to buy new pistons but thats where i get lost never done it before if i went and got new 3t pistons it won't hit anything? or will i have to machine

[Born-Enthusiast]

but make sure you fly cut your pistons so the valves wont hit the pistons and if you a running hotter cams give it deeper mainly inlet for longer duration cams

sorry was writing my reply didn't read yours

[Rodger]

Born-Enthusiast,

Good first choice on engine upgrades. It will be plenty drivable and do it with stock cams.

10.5:1 is a very good compression ratio to aim for. Flycutting the standard 3T pistons alone may not net you that ratio though.

Start by flycutting the pistons and then shave around 1mm off the head that will get you closer.

If you buy new oversize 3T pistons be sure they can also be flycut to clear, otherwise a custom forged set is next on the list. The stock Toyota ones will be fine though.

If you can do the measurements of, combustion chamber volume and piston crown volume then you can calculate to very close what the actual ratio will be.

My 2T I am just replacing ran around 10.5:1 and ran well on regular unleaded with 44mm Mikuni/Solex carbies, with 10 degrees of static timing. I dont run vacuum advance but I think max advance was around 30 degrees. It was built with 1mm oversize Toyota 2T pistons and a 1mm head shave.
It produced 74rwKw at 7000 rpm.

Regards

Rodger

[sillycar chick]

Born-Enthusiast,

Have a read of my thread in tech&conversions, "2T-G/3T Hybrid Compression Problems", some of the info in here might help you out, and feel free to post in there/PM me if you have any other Qs, ideas, As etc. Have fun with your build!!

[Born-Enthusiast]

yeah i just read it then quite interesting but i was never good with numbers so i got a bit lost in the equations ha ha but thanks for the help. it'd be great to hear about your engine when you get it done.

[Born-Enthusiast]

Born-Enthusiast,


If you buy new oversize 3T pistons be sure they can also be flycut to clear, otherwise a custom forged set is next on the list. The stock Toyota ones will be fine though.

what do oversized 3t pistons do?

[Rodger]

A couple of things:

Firstly a capacity increase which then secondly raises the compression ratio. All this means an increase in torque and power.

I went oversize on one of my 2T motors, 1mm to an 86mm bore and I got 1626cc up from 1588cc.

On my other 2T engine I went to a 4mm oversize 89mm bore and I got 1740cc.

For the 3T a 1mm oversize 86mm piston = 1812 odd cc.

A 4mm oversize 89mm piston = 1940 cc.

The engines can be bored most often to 4mm oversize unless they show signs of major internal rusting. Say a life running with plain water as coolant.

4mm oversize pistons are available for the 3T but usually custom forged and around $1000 for the set.

Regards

Rodger

[Born-Enthusiast]

cheers rodger i love the way you slowly built my up my excitement with information and then gracefully killed it with the price ha ha i don't have that kinda cash but thanks for the advice it may be something to look into in a more currency funded year

[RyleyMA61]

as far as i know, all the 3t pistons will require flycutting... my friend 'the gw' built a hybrid with the works, but it never made it on the road. he is the one to ask any questions, he should be able to help you... when he gets back in about 3 weeks

[Born-Enthusiast]

cheers ryley you my wanna tell silly car chick that too she's doing the same project

[sillycar chick]

Cheers Ryley,

I knew about the flycutting, my dad started this project just before I was born so I already had a set of pistons ready to go (and new bottom end) just had to play around with the head etc.

[Born-Enthusiast]

Ok, so I know its been a VERY long time since I updated this thread, however I was financially uh. . . unmotivated for a very long time . But good news I scrounged up some dosh and began working on my project engine again . i started with taking the old 2TG apart. . . As it the block wasn't needed I got rid of it. The head on the other hand I took down to the machine shop to go through a very standerd recondition. ). so the block was next. A horrid ugly 13T, painted white!?! Why would you paint an engine block white I will never know. So I took it also down to the machine shop and got it cleaned bored one oversize, honed and faced. I was thinking of different colours to paint it. Seeing as though I have decided on a burnt orange and black pant job I figured; why not follow suit? So I painted the block a nice gloss black. .