Toymods Car Club Inc: Tech & Conversions => 2TG/4AG part 2

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thetoyman75
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May 2002

Re: 2TG/4AG part 2	Tue, 04 June 2002 04:54

Bill, You didn't say the 2TG didn't have a thermostat Just that the 4AGE thermostat controlled water going into the block. Since you made no Reference to the 2TG I was unsure what you were comparing. Thanks Seadog for pointing it out The 2TG thermostat is on the exit side of the engine. Not sure how that is a worse design tho ? Either way water is prevented from recirculating ? Heat soak into the radiator is just occuring at opposite ends of the system ?? What is the benefit of the 4AGE design ?? Genuine question not having a shot here. Valve Sizes. The 2TG does have two different valves sizes. Intake valves on the 11111-88220 2TG head were only 43mm. In April 1973 they released the 11111-88222 head. It was the first to have the 44.5mm intake valves. The 11111-88260, 11111-88261 and 11111-88262 heads all share the same valve sizing. They only vary in cam profiles and Compression. This was due to the ever tightening emissions laws. As for Pully size 4AGE is definatly better suited to the sliding adjustable gears. The vernier type advustment is acheiveable with a 2TG but it is set up differently. You require 15 Holes to be drilled into the pully and 16 into the Cam itself. When set at the correct spacings this then gives you your adjustable pulleys Hardly anyone bothers due to the setup time involved. The more cammom practive is to re-dowell each pully at the correct location by drilling 1 addition hole thru the pulley and into the cam Takes all of 5 minutes a side and your timing is perfect (But not adjustable) Corvid, The best time down the quarter for Tina's car so far is 16.052 @ 85.45MPH. Its not a great time but not bad for my third trip to the creek. Seadog, According to my Diary kg = pounds x .4536. Using that basis your weights are: 4AGE - 122.5kg 4AC - 108.9kg 2TG - 145.2kg Look like they are pretty accurate if you reference the 2TG weight to the Toyota 2TGEU weight ! So there it is, 22.7 kgs weight advantage to the 4AGE ! OK heres a new train of though I am looking into ! Feel free to pull this theory to shreds I am still looking for info to evaluate it. I have been curious for some time why it is there are T series drag engines areound the world but very few A series Drag engines. I have come to beleive this is due to Cam limitations on an A series head. Since the head is Narrower I am guessing there is considerably less room to swing a High lift camlobe in a 4AGE head. Just wondering if the extra valve compensates for this at the far edge of profiles. ??? Again this is just an initial thought would love to hear everyones thoughts and hopefully some figures to show either way ! I assume the extra valve more than compensates but would love to know for sure. [Report message to a moderator]

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