I have an Isky ground solid roller that came with an engine I bought and want an opinion about how aggressive the lobe profiles are and how they would treat a Buick valvetrain. I do have TA 1.6 roller rockers and this is an 11:1 Stage 2 SE headed engine. Here are the specs: Intake lobe: Adv Dur 284 dur@.050 250 dur@.100 215 dur @.200 162 dur@.300 107 Exhaust lobe Adv Dur 290 dur@,050 244 dur@.100 211 dur@.200 160 dur@.300 106 I got these specs from Iskys master lobe catalog but don't know how to interpret them. Cam is ground on a 112 lobe center. Thanks for any info. Steve
Mild stick, wait I may have read it wrong its 284 and 290 at .050?, lord all the numbers run together ha 250 and 244 at .050 correct? And I think they are reversed shouldn't have more intake than exhaust, not on a NA engine anyways
I tried to separate them but when I post it deletes all the spaces! It's 244/250@ .050 Maybe I reversed it, mainly wanted to know how aggressive the stick is... Sent from my iPhone using Tapatalk
Steve How aggressive it is also depends on the lobe lift of the cam, so we would need that info. If you want a bit of a guide, and this is not perfect, but you can go to the comp cams lobe catalog, they have hundreds of lobes for a solid roller, and each family of lobes has a description of it's characteristics. Comp cams lobe catalog is online. JW
Ramp rate is 3.93.. for a solid roller, that is not bad. Follow manuf spec for valve spring pressure, if it exceeds 500 lbs open, then I would suggest some form of lifter bore reinforcement. JW
Had those springs checked out and they were 300 on the seat and 570 open! Isky recommended 450-500 open for those lobes. Changing springs.
Stay closer to the bottom end of the reccommended spec, safer for the block, and we are typically not trying to turn these things 7500 rpm.. You can always add shims if required. JW
I asked that same question to the phone guy at TA when ordering a cam , he said " it otta hit like a ton of bricks"
