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RWDboy
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Location:
South Australia
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July 2002
2TG weak spots (and cures)? Mon, 15 September 2003 01:38 Go to next message
I'm building a 2TG for a rally car, and obviously it's going to take a fair bit of stress. It'll probably be in the 5500 - 7500 rev range alot. It's my understanding (I'm new to building 2TGs) that the bottom end is fairly strong, and can rev quite well up to ~8000 rpm. But the head is not so strong.

Basically I need some advice, are their any common component failures that I should be aware of that I can fix (before i blow them up myself)?

I'm going to spend quite a bit building up this engine, so expense shouldn't really be an issue, but obviously if there are as good cheap solutions I'm all ears.
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TA22-3SGTE
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MACKAY
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May 2002
Re: 2TG weak spots (and cures)? Mon, 15 September 2003 11:42 Go to previous messageGo to next message
If money is no problem you would be better off spending it on a 4AGE and putting that in your rally car as the 4AGE is much lighter than the 2TG and loves to rev all day and will make more power .

Trevor
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RWDboy
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July 2002
Re: 2TG weak spots (and cures)? Mon, 15 September 2003 12:54 Go to previous messageGo to next message
Unfortunately - that's completely not within CAMS regulations for PRC Sad
Engine swapping is pretty much a no-no (except recently the rotor people kicked up a fuss and forced CAMS to allow them to put 13B in their series 3 RX-7s)

My next rally car project will be an AW11 (4A-GE yay) but that's not going to be for a couple of years...
Any other takers for this one?
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Jonny2TG
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Location:
Tasmania
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May 2002
Re: 2TG weak spots (and cures)? Mon, 15 September 2003 14:52 Go to previous messageGo to next message
2T-G is a good solid engine. Just rebuild it to standard specs and you should be right, especialy if you keep it under 7800rpm. People only have problems with the bits they make themselves. The actual Toyota made 2T-G parts are good. Things go out of tune when people use poor quality throttle linkage setups they made themselves.

If always at 4000-7000rpm, you best get some regrind cams, say 288 degrees, and dial them in. Good idear to lighten the flyhweel. Also very good to take advantage of a 3T crank and pistons. This gives you 1800cc and higher compression, and very easy to do. (Have to machine the 3T-C pistons a tad).

If you need to go to 8000rpm and beyound, you need new valve springs, ballanced bottom end, and good conrod studs and/or conrods.

If you got money, just get a realy big radiator. And maybe a oil cooler. And acurate temp gauges, oil pressure gauges.
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RWDboy
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July 2002
Re: 2TG weak spots (and cures)? Tue, 16 September 2003 03:25 Go to previous messageGo to next message
So generally speaking, no one has any big problems with things like oil pumps/pick up - water pumps, alternators? I hope these things take alot of stress well?

Most likely I'm going to get the bottom end balanced anyway, and a new set of lighter weight pistons (higher compression). Just as long as the conrods/bearings don't fail.

Possibly get a larger radiator, and at least an extra electric fan for when the car is idling about.

It's pretty easy to underestimate the amount of stress a rally car takes, so I'm very cautious! (Maybe too cautious)
Blowing up an engine always turns out more expensive than building a strong one to begin with.
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EMP-2TG
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Carlingford, Sydney
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May 2002
 
Re: 2TG weak spots (and cures)? Tue, 16 September 2003 05:04 Go to previous messageGo to next message
u can always use a 3tgte oil pump
which is bigger
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RWDboy
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South Australia
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July 2002
Re: 2TG weak spots (and cures)? Wed, 17 September 2003 01:50 Go to previous messageGo to next message
I suppose the 3T non-turbo oil pumps are the same size as the 2T ones?
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Jonny2TG
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Tasmania
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May 2002
Re: 2TG weak spots (and cures)? Wed, 17 September 2003 11:06 Go to previous messageGo to next message
If you want, you can get ARP conrod bolts. And new valve springs.

Go here:
swmotorsport.com.au
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RWDboy
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July 2002
Re: 2TG weak spots (and cures)? Wed, 17 September 2003 14:18 Go to previous messageGo to next message
How much do you get those for (ARP bolts)? My brother uses them on his rally car, but they came with his steel aftermarket conrods.
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EMP-2TG
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Re: 2TG weak spots (and cures)? Wed, 17 September 2003 15:17 Go to previous messageGo to next message
$90.10 from the above link
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RWDboy
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Re: 2TG weak spots (and cures)? Thu, 18 September 2003 07:01 Go to previous messageGo to next message
D'oh - I missed that link...sorry Smile
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roadrunner
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Location:
Hornsby, Sydney
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October 2002
Re: 2TG weak spots (and cures)? Thu, 18 September 2003 07:27 Go to previous messageGo to next message
Ive had one that started to drop oil pressure at idle. but she was old and flogged.

and if your running cabries i think a set of webers makes alot of difference
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RWDboy
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Location:
South Australia
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July 2002
Re: 2TG weak spots (and cures)? Thu, 18 September 2003 13:10 Go to previous messageGo to next message
So is a 3TG oil pump any different to a 2TG oil pump in regards to flow capacity? Or is the 3T-GTE the only other alternative way to go.

And I've picked up some 40mm dellortos - which are very similar to Solexes in many respects, but you can get parts easier for them.

Another thing, can you run a 2TGEU dizzy on a 2TG, and if so, what kind of electronic ignition coil can you use to get good spark at high revs etc? (just interested, not sure if I'll do this or not).

[Updated on: Thu, 18 September 2003 13:18]

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RWDboy
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Re: 2TG weak spots (and cures)? Mon, 22 September 2003 01:35 Go to previous messageGo to next message
*cough* bump...
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EMP-2TG
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May 2002
 
Re: 2TG weak spots (and cures)? Mon, 22 September 2003 02:09 Go to previous messageGo to next message
as far as i know the 3tgte oil pumps flow more
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RWDboy
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Location:
South Australia
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July 2002
Re: 2TG weak spots (and cures)? Mon, 22 September 2003 03:31 Go to previous messageGo to next message
Is the 3TG oil pump the same as the 2TG oil pump?
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EMP-2TG
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Location:
Carlingford, Sydney
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May 2002
 
Re: 2TG weak spots (and cures)? Mon, 22 September 2003 04:08 Go to previous messageGo to next message
there is no such thing as a 3tg?
i take it u mean the 3t pump
im guessing its the same as a 2t/2tg pump

there should be a few ppl around on the forums that can clear this up
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thetoyman75
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Club President
I supported Toymods

Location:
Sydney
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May 2002
 
icon7.gif  Re: 2TG weak spots (and cures)? Mon, 22 September 2003 09:00 Go to previous message
Just to clarify:

The 3T-GTE oil pump is different to ALL other T series pumps and will result in higher oil pressure (when fitted to any other T series engine).

Wether or not you need it is an entirely different question, remember an increased load will use more power to run it !
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