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Location:
Tasmania
Registered:
May 2002
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Re: Numbers from this combo? (4AGE)
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Mon, 09 August 2004 11:56
 
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It is typical of sidedraft carbs, that unless they are perfectly setup, they will just splutter and die if you press the throttles open right away. You have to ease on the throttle, and let the revs build natrualy before you give it too much. Realy, its just a big flat spot. It is posiable for a intelegent and knowledgeable person to tune this out with different jets and air correctors etc. Webbers are more tunable in this way I am told. Or, you can just run it a bit rich which is far easier and eliminates most problems. With a standard 2T-G, jetted just a bit rich, I got it running very nice, with almost no flat spots. But with the sidedrafts combined with the big 305 cams, opening the throttles fully below 3000rpm will just result in splutter and back fire, no power. Let the revs built natrualy to 3000rpm, then press the throttle, and hold on! Suddenly it becomes a nice smooth engine at 4000rpm and good power up to 7500rpm. (Will rev past 8000 if everything is spot on, mine is not).
With the 4A-GE 4 valve design, plus EFI, I expect you would have better drivability and torque in the lower revs with the same cams. No need for any flat spot. And the 4 valve design should give more power at the top end also. A 2T-G can only just manage 100hp/liter with about 310 degree cams and big carbs. Its not that hard to get 200hp from a 1.6 liter 4A-G due to the O2 advantage and lower reciprocating weight. The exact recipe of how I am still finding out, but I think most of it is in the cams, and computer tuning to match, and valve springs and conrods to take the rpm needed.
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| | Subject | Poster | Date |
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Numbers from this combo? (4AGE)
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su_pr_aero | Sun, 08 August 2004 12:54 |
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Re: Numbers from this combo? (4AGE)
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Jonny2TG | Sun, 08 August 2004 13:56 |
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Re: Numbers from this combo? (4AGE)
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su_pr_aero | Mon, 09 August 2004 00:45 |
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Re: Numbers from this combo? (4AGE)
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Jonny2TG | Mon, 09 August 2004 08:27 |
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Re: Numbers from this combo? (4AGE)
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THE WITZL | Mon, 09 August 2004 03:32 |
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Re: Numbers from this combo? (4AGE)
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su_pr_aero | Mon, 09 August 2004 04:15 |
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Re: Numbers from this combo? (4AGE)
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Spanktown | Mon, 09 August 2004 04:17 |
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Re: Numbers from this combo? (4AGE)
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ae86drift | Mon, 09 August 2004 05:28 |
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Re: Numbers from this combo? (4AGE)
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jesseT18 | Mon, 09 August 2004 09:48 |
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Re: Numbers from this combo? (4AGE)
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Jonny2TG | Mon, 09 August 2004 11:56 |
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Re: Numbers from this combo? (4AGE)
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mrshin | Tue, 10 August 2004 06:08 |
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Re: Numbers from this combo? (4AGE)
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Jonny2TG | Tue, 10 August 2004 07:47 |
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Re: Numbers from this combo? (4AGE)
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mrshin | Tue, 10 August 2004 14:32 |
