hyd. vs soild heads?

[14flower]

the valves arent stock length the only stock size. thats y i can go up to .540 lift

[14flower]

and i built my engine with my curent cam on a pc build and like u said max power was 6000 and droped 5 hp at 6500 and 20 hp at 7000 and 45 from max at 7500 and playing with schinders cams the best is the 304h but with a 112 lobe center but the only down side is they dont say what intake and ex lobe centers are. so i played with ti and the motor like 116 and 102 lobe centers. so why is it everyone grinds there cams at 106 if 112 makes more power ?

[crcltrakr]

Because people don't race PC's and a Real life dyno makes no assumptions on the data!

[Racedad]

The tighter102-108 lobe centers accelerate harder in the mid-range,110 plus gives a smoother idle and more high rpm power.
Actual valve timing events are the most important measurements but lobe centers are useful way to compare cams.

[14flower]

thanks racedad that makes alot more sence. thanks for explining it instead of hating that i brought what found out. on a pc.

[engineczar]

I don't think there's any hating going on. Just folks trying to help. Another characteristic of lobe centers is that tighter lobe centers tend to be peaky horsepower wise. Wider lobe centers tend to produce a flatter but wider torque curve. On tracks with longer straightaways I tend to use 110 and up centerlines.

[14flower]

ok that makes sence. well ran the car this weekend after reseting the cam heads up and 32' adv and ran realy good and went from my 723/4 lr role out to a 74 lr role out and rr from a 733/4 to a 741/2 to help the gearing/ rpm problem and it seem to help installing a tech for the next race. so why where talking about cams what about heads i know most people say its all personal preference but is there one thats better for say a 1/4 mile track?

[crcltrakr]

You might try 4-6 degrees more timing, most built 2300's like 38-40 total.....

[car62]

i agree with Jerry(crcltrakr)

we run 36-38 with stock rod and 38-41 with long rod...makes a HUGE power difference

[Dan32]

what rpms should i try to have then at then end of the striaght away? and that somehing else i was wondering what rpm max should i turn with that set and a 5.2 bottom end?

you can turn stock rods 8200 if you know the tricks and use good rod bolts! i would run 103 lobe seperation will get you of the corner better but with out flowing your head your running in the dark you must know what your capable of before you start tossing money at it! and valve springs plays a huge part in your rpms so start at the bottom and go up!!

[Dan32]

You might try 4-6 degrees more timing, most built 2300's like 38-40 total.....

with 5.2 rods??

[14flower]

ya i only run like 32 34 but that was on 103 octane now runing 114 too. and dan i just have normal arp rod bolts was thinking of rying to put arp s2000 rod bolts in some 5.2 rods just to play with it. and im gona flow the head with in the next couple of weeks. and i found a guy with a raceengineering cam forsale on ebay has 104 lobe center with intake on 102 and 252 duration @.050 .480 lift would that work?

[Dan32]

ya i only run like 32 34 but that was on 103 octane now runing 114 too. and dan i just have normal arp rod bolts was thinking of rying to put arp s2000 rod bolts in some 5.2 rods just to play with it. and im gona flow the head with in the next couple of weeks. and i found a guy with a raceengineering cam forsale on ebay has 104 lobe center with intake on 102 and 252 duration @.050 .480 lift would that work?

not bad check those #s make sure there right!!

[14flower]

i did i went to raceeng.com and double checked the cam card.