i know a little about what pat is saying.. N/A engine you run the cam loped close together. common is between 108-114* between exhaust closing and intake opening. the small the 1XX* numbers is the more the valve are open allowing a said"scavanging affect" on the intake. getting more fresh air into the cylinder. even more so when you run a tube header or the like that allow for a rapid cooling of the hot exhaust gas. do this creatase a "said" vaccum on the cylinder... wider lobe sep (112+)has a tendincy to have a wide rpm band and good off idle nature. the narrow 110 and less has a much narrow and more of a rough idle and narrow power band.. (hope that makes sense)
with that said, turbo charged anything gasser and diesel alike have scavngine between exhasut and intake vlv is mush less disirable... .you want a wide lobe seperation. the allows for the comeplet charge to be showed out the exhaust with minimum backwash into the intake (rememebring the exhaus is pressureizes)...
maintainign a said lope sep say 114* you can only increase you duration so much before you have to increase you ramps on the cam. the dmax runs a solid roller lifter setup.
know knowing the guy has kinda got this market looked down for now. and hes is not going to diclose his specs...
there are 3 way to make more power.
1.) is hold the vlv open longer. longer duration
2.) opend the vlv farther ie more lift
3.) combo of 1 and 2
keeping with the single pattern cam meanign intake and exhaust are the same. 178* @ .390 is stock
1.) bump the duration up by 10* to 188* keeping everything else the same.. this will more the power band (PB) up 100-200rpms
2.) leave duration allone and increase net lift from .390 to .415. this will have minimum effect on the PB as to were is fall in a said operating range. but will increase power.
3.) is a split pattern/ dual pattern cam. this is were you take two diff cam profiles and combine them. these style of cams tend to have a wider/flatter PB then a said single pattern cam with the same intake specs.
it would look liek 188/178* and .390/.415 @ .050
here is an example of a gasser turbo cam form crower.
226/208* @.050 lift .465/.420 with a lobe ses od 114* intake is much larger than the exhaust.. basicly the oppostion of a tradtioanl N/A camp
im going to gues the guys cams resemble some like the cam from crower that i posted
there is aloot of work that goes into this make of a cam. makeing sure that there is enough give between piston and valve as well
how many did i just confuse :rofl:
