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Old 07-23-2004, 01:11 AM   #16
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No problem dude..that's why I'm here!
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Old 07-28-2004, 10:22 AM   #17
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There is another reason to stick with rotary carbs in gas trucks. When you have a slide carb, the throttle linkage must run somewhat lengthwise with the chassis. Because of this, when you run across a very bumpy section that causes some chassis flex, it will also affect throttle position. This causes surging though bumpy sections. Rotary carb linkages run across the chassis, and aren't affected by chassis flex.

To add to what others said above, the OS engines are great. If you race at tracks with good traction, and/or have a smooth trigger finger, choose the CV-R. If you race on dusty, loose tracks and tend to yank the trigger, you'll be faster with the CV. The only downside to the CV, is the poor fuel economy. 5 minutes to a legal sized tank is about all I could ever manage.
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Old 07-28-2004, 11:03 AM   #18
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Quote:
Originally posted by Bodido
The only downside to the CV, is the poor fuel economy. 5 minutes to a legal sized tank is about all I could ever manage.
The cure for the poor fuel economy for a CV motor is to replace the cooling head with a aftermarket one. The stock head doesn't do a great job at cooling the motor so you need to richen up the mixture to keep it cooler. After you replace the head, then you can lean the motor out without it overheating and extend your fuel mileage. I picked up a O'Donnell head from ebay for cheap, and I can run between 8-10 minutes on a tank of gas depending on how much I lean the mixture out.
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Old 07-28-2004, 11:38 AM   #19
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sirio evo 2, 3 port, at 160 lots of power turbo or non turbo just screams, or go for the 5 port turbo for 30 bucks more, along with a rd logics or ths rear exhaust inline system, watch out!
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Old 07-28-2004, 12:48 PM   #20
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HeY!!!



your best bid will prolly be one of the os. .12 or the .15
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Old 07-28-2004, 01:30 PM   #21
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Chassis flexing and affecting throttle position? That's not really an issue (or shouldn't be).

Flash Gordan - That's one of the biggest mistakes an inexperienced tuner will make (and the aftermarket seems to encourage the same behavior).

Simply because an aftermarket head cools your engine better than the stock one, doesn't mean you should lean the engine out for more performance. The leaner the engine, the less fuel (and oil) is getting into your engine, which will cause the engine to wear out prematurely.

If you are going to use an aftermarket head, tune the engine with the stock one, and then put the aftermarket head on there.
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