Dyno Chart w/Intake Cam Retarded one Tooth?
Nov 5, 2005 | 09:56 PM
#4
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Dyno Chart w/Intake Cam Retarded one Tooth?
The theory of a 4 valve cylinder head was to run a bigger cam on intake and a smaller cam for exhaust.
To have the best of both worlds, that is , good torque and good horsepower.
I just don't understand why the cam manufactures still make cams as if it is a two valve head.
I am going to try when I do some dyno work.
To have the best of both worlds, that is , good torque and good horsepower.
I just don't understand why the cam manufactures still make cams as if it is a two valve head.
I am going to try when I do some dyno work.
Nov 5, 2005 | 10:52 PM
#5
Pro Rider - Oldham Racing
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Dyno Chart w/Intake Cam Retarded one Tooth?
Scooby we have dynoed some motors like that, the later intake opening makes the engine want to rev higher. We noticed the power adder motors like this best because your already making lots of cylinder pressure with the boost or nos so the loss of cyl pressure is not noticed.
It seemed that one tooth was way too much so we ordered a pile of cams with different lobe centers and dynoed them all to see which way the motor liked it best. We did most of this testing on naturally aspirated engines and one nos engine combo. We also noticed that every combination of porting and carb/carbs made huge differences in what cams the motor wanted.
It seemed that one tooth was way too much so we ordered a pile of cams with different lobe centers and dynoed them all to see which way the motor liked it best. We did most of this testing on naturally aspirated engines and one nos engine combo. We also noticed that every combination of porting and carb/carbs made huge differences in what cams the motor wanted.
Nov 8, 2005 | 01:46 AM
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Dyno Chart w/Intake Cam Retarded one Tooth?
Originally posted by: MisterHP
Scooby we have dynoed some motors like that, the later intake opening makes the engine want to rev higher. We noticed the power adder motors like this best because your already making lots of cylinder pressure with the boost or nos so the loss of cyl pressure is not noticed.
It seemed that one tooth was way too much so we ordered a pile of cams with different lobe centers and dynoed them all to see which way the motor liked it best. We did most of this testing on naturally aspirated engines and one nos engine combo. We also noticed that every combination of porting and carb/carbs made huge differences in what cams the motor wanted.
Scooby we have dynoed some motors like that, the later intake opening makes the engine want to rev higher. We noticed the power adder motors like this best because your already making lots of cylinder pressure with the boost or nos so the loss of cyl pressure is not noticed.
It seemed that one tooth was way too much so we ordered a pile of cams with different lobe centers and dynoed them all to see which way the motor liked it best. We did most of this testing on naturally aspirated engines and one nos engine combo. We also noticed that every combination of porting and carb/carbs made huge differences in what cams the motor wanted.
Yea one tooth SHOCKED me !! didn't think that much would worK.. I've read and seen alot about ya Scooby. You seems to know your shhhhiii.. stuff. Hell I have yet to get our turbo to run right!! Making progress the hard way !!!! TRY IT, BLOW IT UP, REBUILD, TRY AGAIN, BLOW IT UP,REBUILD ETC.!!??
Nov 12, 2005 | 05:13 PM
#7
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Dyno Chart w/Intake Cam Retarded one Tooth?
Does anyone know of a dyno chart posted online showing web 109's on a 650cc motor? I just tried the 109's with the intake cam retarded one tooth to get around 110 degree lobe centers. The upper RPM power holds forever.
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Nov 12, 2005 | 05:33 PM
#9
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Dyno Chart w/Intake Cam Retarded one Tooth?
nope on lobe centers. there are 34 teeth on the camshaft so one camshaft tooth equals 360/34 = 10.5 camshaft degrees. Since the crank gear is 17 teeth and rotates twice for ever one camshaft rotation, one tooth on camshaft equals 21 crankshaft degrees. When you retard the intake cam one tooth the lobe centers increase by 10.5 degrees not 21 degrees because this is a relative measurement between the two 34 tooth cams. camshaft diagram
it's not missing peak HP with the turbo, it gained a lot of HP over stock cams. the turbo amplifies the gains you get on a naturally asperated motor.
the turbo positioned under seat shifts the torque curve to the right.
i'm running a twin 40mm throttle body.
i'm also running custom ignition timing and of course methanol.
it's not missing peak HP with the turbo, it gained a lot of HP over stock cams. the turbo amplifies the gains you get on a naturally asperated motor.
the turbo positioned under seat shifts the torque curve to the right.
i'm running a twin 40mm throttle body.
i'm also running custom ignition timing and of course methanol.
