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Ok so for those of us who do not have or can afford to make dyno runs to adjust our power valves.Is there a guideline for how many turns or portions thereof that equates to X RPM?For example:.5 Turn is approx X RPM1 turn is approximately X RPM?1.5 Turns is approx XThanks for the real information on the PV Jerry, lots of great insights.
The 3 graph shows the inconsistency of the Power Valves closing RPM made back to back over a time period of 30 seconds. The zig zags are produced when the valve closes at a RPM where the closing point is not at the optimum RPM.
Quote from: MotorGeek on April 29, 2015, 02:19:29 pmThe 3 graph shows the inconsistency of the Power Valves closing RPM made back to back over a time period of 30 seconds. The zig zags are produced when the valve closes at a RPM where the closing point is not at the optimum RPM.If you flip the bottom line to time and not rpm it shows how quick the zig zag happens. Real quick.Then you take it to the track and run it on timers, alot of times it will ET quicker with a little zig zag then with out.Just a guess, but I think it helps set the bike / tires for a millisecond.Makes you want to pull your hair out I know that.Good stuff MotorGeek. thanks for posting
A stock of the show room floor LT500R will make around 50 hp to the rear wheels on my dyno. The formula for horsepower is: HP = (Torque x RPM) / 5252 Torque and RPM were on most of the graphs. On one of the graphs peak Torque of 57 ft.-lbs occurred ad 6500 RPM. Example: (57 x 6500) / 5252 = 70.5 hpThis engine was not stock..... It had a big carb, head work, porting, and intake system and a HPR 19 exhaust system.The sag or small dip in the power curve between 6500 and 7500 RPM after the power valve was properly adjusted, was due to the intake system's tuned length and porting not being right
thanks for the info. i don't think ill be messing with power valve cause i'm just trying to hold on. previous owner told me that my bike was 95 horsepower and could go over100mph. this is my first bike/atv, so learning on this beast is scary. barely hit the gas and your doing wheelies?Im scared to hit the gas because of that. i just need way more hours, but cant register trailer or quad without titles. hey, do you own a registered garage? maybe you could help if you do. the dmv actually told me to find a registered garage and do a leinholders title reissuance, then pay them to get them 'sold' back to me.....sad that government wants to control everything, but doesnt know how to deal wth anything out of their parameters. anyways, im a professional not a car theif, so this shady idea presented by the dmv lady actually would work. i wonder if she even realized that what she saying was the secret car thief formula.Quote from: MotorGeek - Jerry Hall on April 20, 2019, 02:15:58 pmA stock of the show room floor LT500R will make around 50 hp to the rear wheels on my dyno. The formula for horsepower is: HP = (Torque x RPM) / 5252 Torque and RPM were on most of the graphs. On one of the graphs peak Torque of 57 ft.-lbs occurred ad 6500 RPM. Example: (57 x 6500) / 5252 = 70.5 hpThis engine was not stock..... It had a big carb, head work, porting, and intake system and a HPR 19 exhaust system.The sag or small dip in the power curve between 6500 and 7500 RPM after the power valve was properly adjusted, was due to the intake system's tuned length and porting not being right
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