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Location:
Tasmania
Registered:
May 2002
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2TG cams?
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Sun, 25 August 2002 13:07
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OK, I will do some searches and try to find out myself. But I have decided to go ahead with some big camshafts for my 2TG, sometime very soon. This is for a daily driver, but your only young once and I don't mind a bit of shitty city drivability if it means I can drag off a commodore ever now and again. Right now its not even worth trying.
Anyway, I think its rally cams I want. Someone said 290 degrees, but others say 304 degrees alot. I want the best for rally style driving, but I will actualy be on a sealed track more often at this time.
So what cams? They need to be cheap, so regrinds I guess, probably need to be exchange? I can sort the shims out myself.
Sean Malory siad not go get regrinds because the extra height in the shin can cause the baucket to tilt or something, but I'm not sure about that. Max lift would be good, but rewelds cost alot more right? And billet ones cost too much?
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Location:
Finland
Registered:
June 2002
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Re: 2TG cams?
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Sun, 25 August 2002 21:26
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Nothing is easy. Only you can make the call what will serve your needs.
For what it's worth, over here in Finland 304 cams are favoured in 5K engined rwd Starlets in gravel rallying. They are re-grinds, with 103,5 degree lobe separation. They're run at 2 degrees advanced. Those engines make anything from 160hp to 175hp at about 8 to 8,5 grand rpm, and about 180 to 195Nm of torque.
304 will offer something 290 will not. 304 would like to be mated with a close ratio gear set. I think it would not be such a bad idea to make gears 1 to 4 for max acceleration, and leave 5th just for cruising. This all teamed up with a touch higher ratio differential.
I guess it would close to ideal if you make engine rev till 8 grand, and 4th gear will give you about 140-150kmh speed. It will not be a highway monster, but it'll have very sharp acceleration up to that point.
If a close ratio gearset is out of budget, there is an alternative. You could alter ratio inside gearbox which transmits the power to 'parallel shaft'. Having a different ratio here will move all gears from 1 to 3 closer to 4th (which is 1:1 ratio). This way you can gain back what you lose when mating higher diff ratio with standard tranny.
That mod will also make your 5th gear ratio move further away from 4th gear.
[Updated on: Sun, 25 August 2002 21:33]
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Location:
MACKAY
Registered:
May 2002
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Re: 2TG cams?
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Mon, 26 August 2002 13:55
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Ok to give you an idea what you might need I had a 2TG in my TA22 . I used the 3T crank and pistons ( flycut ) had about 11.2 - 1 CR , 288 cams with .400" lift , extractors and 40mm sidedraughts . The best time I run was 14.8 , so you may need to go a bit bigger in the cams and run CR about 11.5 and get a set of 45mm carbs .
Trevor
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