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Location: South Australia
Registered: July 2002
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2TG weak spots (and cures)?
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Mon, 15 September 2003 01:38
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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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Location: MACKAY
Registered: May 2002
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Re: 2TG weak spots (and cures)?
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Mon, 15 September 2003 11:42

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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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Location: South Australia
Registered: July 2002
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Re: 2TG weak spots (and cures)?
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Mon, 15 September 2003 12:54

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Unfortunately - that's completely not within CAMS regulations for PRC 
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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Location: Tasmania
Registered: May 2002
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Re: 2TG weak spots (and cures)?
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Mon, 15 September 2003 14:52

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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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Location: South Australia
Registered: July 2002
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Re: 2TG weak spots (and cures)?
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Tue, 16 September 2003 03:25

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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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Location: Carlingford, Sydney
Registered: May 2002
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Re: 2TG weak spots (and cures)?
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Tue, 16 September 2003 05:04

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u can always use a 3tgte oil pump
which is bigger
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Location: South Australia
Registered: July 2002
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Re: 2TG weak spots (and cures)?
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Wed, 17 September 2003 01:50

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I suppose the 3T non-turbo oil pumps are the same size as the 2T ones?
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Location: Tasmania
Registered: May 2002
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Re: 2TG weak spots (and cures)?
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Wed, 17 September 2003 11:06

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If you want, you can get ARP conrod bolts. And new valve springs.
Go here:
swmotorsport.com.au
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Location: South Australia
Registered: July 2002
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Re: 2TG weak spots (and cures)?
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Wed, 17 September 2003 14:18

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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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Location: Carlingford, Sydney
Registered: May 2002
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Re: 2TG weak spots (and cures)?
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Wed, 17 September 2003 15:17

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$90.10 from the above link
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Location: South Australia
Registered: July 2002
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Re: 2TG weak spots (and cures)?
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Thu, 18 September 2003 07:01

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D'oh - I missed that link...sorry 
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Location: Hornsby, Sydney
Registered: October 2002
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Re: 2TG weak spots (and cures)?
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Thu, 18 September 2003 07:27

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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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Location: South Australia
Registered: July 2002
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Location: South Australia
Registered: July 2002
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Re: 2TG weak spots (and cures)?
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Mon, 22 September 2003 01:35

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*cough* bump...
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Location: Carlingford, Sydney
Registered: May 2002
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Re: 2TG weak spots (and cures)?
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Mon, 22 September 2003 02:09

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as far as i know the 3tgte oil pumps flow more
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Location: South Australia
Registered: July 2002
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Re: 2TG weak spots (and cures)?
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Mon, 22 September 2003 03:31

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Is the 3TG oil pump the same as the 2TG oil pump?
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Location: Carlingford, Sydney
Registered: May 2002
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Re: 2TG weak spots (and cures)?
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Mon, 22 September 2003 04:08

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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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Club President I supported Toymods
Location: Sydney
Registered: May 2002
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Re: 2TG weak spots (and cures)?
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Mon, 22 September 2003 09:00
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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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