Stage 4 Head & Big Cams - settings
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787 Posts
call chuck at rc performance. he can give you some good starting areas. you need to know your whole setup like head gasket thickness,piston height, etc. everything u did to that motor.
heard min p to v of .050" intake .070" exhaust is safe. For torque generally lower centerlines are desireable but that is very dependent on what your available p to v clearances will allow. higher centerlines shifts power higher and increases clearance. setting lower aiming for maintaining torque n midrange grunt reduces clearances how low you set centerlines will be dependant on clearance YOUR motor has be sure to measure carefully and double check:2thumbs:
Not sure how dyno read in your area but if it not stingy 200 would not be hard for 1070 and monster head and cams like that hope it works and isnt too much for the motor. Let us know how it does:beer:
Not sure how dyno read in your area but if it not stingy 200 would not be hard for 1070 and monster head and cams like that hope it works and isnt too much for the motor. Let us know how it does:beer:
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196 Posts
today we try low lobe numbers 106/108 and p. to v.clearances are very good : intake 0,79" & exhaust 0,98"
Thats my today setup :
Intake Opens 15° Before TDC
Exhaust Opens 40° Before BDC
Intake Closes 50° After BDC
Exhaust Closes 5° AfterTDC
Overlap: 20.00 degrees
Intake Duration: 245.00 degrees
Exhaust Duration: 225.00 degrees
whats you think about this for nitrous 3mil bike ?
really thanks for help , :2thumbs:
Thats my today setup :
Intake Opens 15° Before TDC
Exhaust Opens 40° Before BDC
Intake Closes 50° After BDC
Exhaust Closes 5° AfterTDC
Overlap: 20.00 degrees
Intake Duration: 245.00 degrees
Exhaust Duration: 225.00 degrees
whats you think about this for nitrous 3mil bike ?
really thanks for help , :2thumbs:
See how it does on the dyno dial in that afr and post up a chart have my fingers crossed for you that it'll hammer out some serious midrange grunt. I think one guys i know who just finished his 1070 with a lesser head set his cams at 105 105 and they were 395 358 cams i pretty sure and he likes the way his is runnin. Its all motor and planning mostly run 1/8 mile stuff. I let you know his 60ft et and trap next time he goes for a comparison when you get yours done.
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196 Posts
so my settings looks good ?
the p to v has plenty which is good esp with extra heat of nitrous. What you running for springs? Assuming good springs and proper assembly it should be just fine. i couldnt tell ya anything about if those exact specs for the opening and closing are good or whatnot maybe chip at kws or rc's or lees or knecum might be of assistance there. Ask guy who made head what he recommends for way his ports are
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752 Posts
:2thumbs: looks good you will be fine:2thumbs:
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196 Posts
anybody know thats correct cams timing or change them ?all day in service and thats our settings :
Intake Opens 10° Before TDC
Intake Closes 45° After BDC
Exhaust Opens 50° Before BDC
Exhaust Closes 5° AfterTDC
Clearances are very good (thats a photo after full rotation of crankshaft)
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196 Posts
thats plasticine :s24:
some hours at service and my center lobe calculate from open and close intake/exhaust is :
Intake Installed Centerline of 107.00 degrees ATDC.
Exhaust Installed Centerline of 110.00 degrees BTDC.
its really hard to set up this big cams ....
some hours at service and my center lobe calculate from open and close intake/exhaust is :
Intake Installed Centerline of 107.00 degrees ATDC.
Exhaust Installed Centerline of 110.00 degrees BTDC.
its really hard to set up this big cams ....
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