RandomHero

iTrader: (24)

Speaking from experience my 224/224 on a 112 lsa LOST low end power over stock.

I was getting into a debate with a guy on another forum and figured I'd ask you guys' opinions on the matter.

Basically my theory is that USUALLY as duration increases the powerband is SHIFTED rather than INCREASED.

The guy I was discussing this with was arguing that with a big cam you just don't lose any low end power and the gains up top mask the minimal gains of low end power/torque.

So if anyone has any dyno graphs or proof one way or another I'd be very interested to see.

Like I said, speaking from experience I lost a ton of low end power to where I couldn't even spin the tires.

EDIT-I'm also speaking strictly in regards to bigger cams. A 212/218 isn't going to prove a point one way or another.

Mr. Sandog

The way I understand it, changes in duration shift the powerband up or down (an increase in duration shifts the powerband up, a decrease in duration shifts the powerband down).

Now shifts in the LSA are what affect the width of the powerband - increase the LSA (i.e. from 110 to 118) and this will widen your powerband. Decrease the LSA (i.e. from 116 to 109) and you will narrow your powerband and the power will feel more 'peaky.'

Ad1

the cam i have now which is 210/218 112lsa killed my low end it wont have the power until at least 3k rpm , so u must have converter to be in the cam range

RandomHero

iTrader: (24)

I'm looking more for dyno graphs or scientific proof, but thanks for the input.

dirt track racer 81

iTrader: (45)

i know it aint much but this graph is 379.9 hp at 6800 and 310 tq at around 5000 with 243s milled .030 and vic jr with a 1375cfm 4150 plate, cam is in my sig. my old 230/226 made 325 at 6000 and 320 tq that was with a 85mm pro prod intake and 241 heads..both runs were made in 2nd gear you can see in the graph that the converter is very loose and flashes to 4500 what i made in the top end overpowers the 10 hp i lost down low.

RandomHero

iTrader: (24)

Better than nothing. It's the best I've seen so far. Thanks Tyler. I would love to be able to find a before and after dyno of a bigass cam in an lsx motor.

Thanks again.

dirt track racer 81

iTrader: (45)

tomorrow i should be around town and ill go up and print off an old dyno run

RandomHero

iTrader: (24)

So would you agree that you sacrificed low-end or not?

Phantom

iTrader: (16)

mark you know i've had some massive cams...tyler has done the tuning. we've never felt dramatic lowend loss...maybe he's just a badass tuner i dunno

dirt track racer 81

iTrader: (45)

it lost some on the dyno yes, seat of the pants no..i never go to the track im always on the street.. i cant even floor it below 40..