Linear Velocity

iTrader: (1)

Well with all these big cams going into stock headed and h/c cars, AAP and I decided to see if we could put it to the test in a bigger CI motor. The original grind I was going with was a 236/238 .610/.612 111 lsa, which is by no means a small cam but we decided to throw in more intake and a heck of a lot more exhaust duration, keep the same lift (heads flow best at a .600' lift) and raise the LSA to help the drivability. Mark @ AAP fired up the motor for the first time last night and it idled great with a stock! PCM <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> (old PCM had been fried). In a perfect world I would have liked to have seen how the first cam would have idled, dynoed it, then put in the current cam and compared numbers, but alas time and money are of the essence. The car is awaiting the little things right now (o2 extensions, lakewood DSL, BBK TB gasket) and once I get some break in miles will be dyno tuned next week. I will keep you all updated. Thanks. ~Tony

bdawg/98mechamta#9

WOW <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> ,thats a big cam!!,,post your #"s asap

Fly By

Who Ground it? <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

Linear Velocity

iTrader: (1)

It's an AAP custom grind, so I'm not at liberty to say. I will however tell you that it isn't from Comp or Lunati <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Vents

iTrader: (9)

Linear,

all i have to say, is it's about freekin time somone does this, i cant wait to hear how it does on the dyno. good luck!

~Vince

Terry Burger

iTrader: (4)

lol then it must be crane. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> Good luck with the new cam.

Linear Velocity

iTrader: (1)

lol good guess Terry, but no. <img border="0" alt="[pimp]" title="" src="graemlins/gr_pimp.gif" />

CHRISPY

Cool <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> where are you looking to peak and where are you hoping to shift? <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Cheers,
Chris

Linear Velocity

iTrader: (1)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Chris ARE 360:
<strong> Cool <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> where are you looking to peak
</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">High. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

and where are you hoping to shift? <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Very high. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

All kidding aside peak power will be up there because of the big duration and high LSA. I'm pretty confident that a my 4.33/26" tire combo will keep the RPMs where they need to be. If I had to guess I'd say peak power at 6700, shift at 7100, rev limiter at 7400 <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> What do you guys think?

Bad30th

iTrader: (13)

WOHOOOO Tony, way to go ***** out on the cam ! That thing is gonna be just sick. <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

Glad to hear it's almost finished ! I can't wait to check it out !

Rob (Bad30th)

Z28sRock

we're starting a pool on how long before Tony crashes it... <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

JPR

Sounds great! I decided lately to step up our program over here too, as long as you have the head flow, it's all good, have fun!

Joe.
(fearing no cam duration!)

DailyAluminumBlock

Actually the high lsa (i.e less overlap) will lower you're power peak. If the cam's icl is dependent on the lsa, as most are, then it is a different story.

Linear Velocity

iTrader: (1)

I thought that higher the LSA the higher the peak power? Anyone give me a definite answer? Thanks.

Phil99vette

iTrader: (11)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by DailyAluminumBlock:
<strong> Actually the high lsa (i.e less overlap) will lower you're power peak. If the cam's icl is dependent on the lsa, as most are, then it is a different story. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Thats right on the money....More overlap ie 106-110lsa will make more power up top where it can benefit from exhaust scavenging while less overlap 112-114 will make less power at a slightly lower RPM.
Phillip

<small>[ April 05, 2003, 04:27 PM: Message edited by: phil97svt ]</small>

DailyAluminumBlock

What I mean by dependent on the lsa is that 4 degrees advance on a 110 lsa makes for a 106icl but 4 degrees on a 114lsa makes for a 110 icl, so in other words the 114lsa cam will close the intake valve 4 degrees later then the 110lsa cam which will acount for people thinking the higher number lsa leads to higher power peak. Closing the intake valve later will always peak power later but when you throw in effects of lsa then people get confused. I hope I didn't confuse you too much <img border="0" title="" alt="[Razz]" src="gr_images/icons/tongue.gif" />

Terry Burger

iTrader: (4)

My experience has always been that 114ls camshafts push the power band up.

DailyAluminumBlock

That is because most 114lsa cams close the intake valve 2 degrees later then most 112lsa cams because more then likely they both have 4 degrees advance ground in.