Jason99T/A

iTrader: (21)

We decided to try an experimental cam in my car last week. We had been wondering how a split pattern cam with bias towards the intake would work on the LS1 motor due to its restrictive intake. If you have a car with a bad-*** exhaust system (Longtube headers, 3" ORP, cutuout), we didn't see the point of the extra duration on the exhaust side. The LS1 exhaust port is pretty damn good in stock form as well. This was all speculation, so we thought it would be pretty cool to try it out.

So, we decided on a Thunder 227/224 .566/.561 114lsa cam. The only difference being the new intake lobe, as the 224 exhaust lobe is the same as I was previously using with great success.

Shane (XtraCajunSS) and I swapped the cam out yesterday in ~3hrs. Everything went well, so it was time to strap it on down on the dyno. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Here are the results:
TR 227/224 114lsa vs TR 224/224 114lsa

I didn't gain a whole lot (as expected), but it was cool trying out something not too many have used. The car had dynoed 389rwhp and 390rwhp on two different occasions, so we had a good baseline for the swap. There is probably a few more hp/tq in it when we go back and fine tune the A/F. It was running around 12.6:1. I made best power last time around 13.3:1.

The car has a little different idle to it and driveability seems to be unchanged.

We want to try the cam on another car with heads/cam where the intake is a little more restricted. We might have some dyno numbers from that in the next few weeks.

Jason

<small>[ April 09, 2002, 08:57 PM: Message edited by: Jason99T/A ]</small>

CHRISPY

I made a couple of posts on this a few weeks ago. Thanks for performing the swap!! I would REALLY like to see the effects of more intake duration and higher lift on the all bore motors as well.
Cheers,
Chris
ps- I think a XE-R based 230/226 .59x/.585 lift 112LSA would be a great comparo too <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Cheers,
Chris

BIGBOS

Those are some good #'s... <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

y2khawk

iTrader: (5)

That cam would do nicey as a turbo cam though.

Unlike a blower, turbos seem to like more intake bias. Looks alot like my new cam <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Jason99T/A

iTrader: (21)

Chris, we just wanted to make one small change at a time. We might try something along those lines later on. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

Geoff

iTrader: (3)

We are happy with the results. Jason did pick up a solid, repeatable 4 H.P. in the upper rpm ranges with out losing any on the low end. We probably could have picked up more high rpm power with a 227/227 cam but it would have been a loser in the low end torque and drivability department. This cam drives just as well the 224/224 cam. It does definitely fly in the face of those using a split pattern cam with the bias on the exhaust. We definitely have further testing to do on this theory with some cars that have ported heads to see if it works as well.

XtraCajunSS

iTrader: (2)

I'll be interested to see how it will work on my 409. I think we'll see yesterday's result magnified by a big inch motor with a stock LS6 intake. More on this later... <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

Jason99T/A

iTrader: (21)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by XtraCajunSS:
<strong> More on this later... <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Hehehehe, I think will be swapping cams again pretty soon. LOL <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

XtraCajunSS

iTrader: (2)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Jason99T/A:
Hehehehe, I think will be swapping cams again pretty soon. LOL <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" /> [/QB]</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Well we've just about got it down to an art... <img border="0" alt="[devil]" title="" src="graemlins/gr_devil.gif" /> TATER!!!

<small>[ April 07, 2002, 10:56 PM: Message edited by: XtraCajunSS ]</small>

VINCE

iTrader: (1)

This was a good comparison.. Opens my eyes.. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

XtraCajunSS

iTrader: (2)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by VINCE:
<strong>This was a good comparison.. Opens my eyes.. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Mine too. I can't wait to try this on my new motor. It will be interesting to see what we can get between 7000-8000 RPM <img border="0" alt="[devil]" title="" src="graemlins/gr_devil.gif" /> without losing bottom end...

VINCE

iTrader: (1)

Funny thing is Crane Cams told me that some people ordered cams that had the exhaust side smaller and they were getting awesome results.. Gained horsepower and did not lose torque downlow.. Probably could run a 230/224 .595/.581 lsa 112 and still be able to use 3.42's.. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Tim98TA

iTrader: (7)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by XtraCajunSS:
<strong>Well we've just about got it down to an art... <img border="0" alt="[devil]" title="" src="graemlins/gr_devil.gif" /> TATER!!!</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Shane did you bring in the jam box to crank up the "Oldies but Goodies"? HAHAHAHA

Tim

<small>[ April 08, 2002, 07:53 AM: Message edited by: Tim98TA ]</small>

Patrick G

iTrader: (14)

Thank you, thank you Jason for trying a "reverse split" duration cam. Ever since I spoke with Brian Ebert (builder of Al Corda's awesome stock eliminator F-Body), he's been a big advocate of reverse split duration cams for LS1s. He likes a 6 degree reverse split with more LSA. One of his cams would look like 230/224, 111LSA. Make one of those and I'll be on my way to Baton Rouge! <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

CHRISPY

Cool information for sure <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
I have been thinking about a XE-R based 230/226 cam on 112LSA <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Cheers,
Chris

Patrick, Comp will grind you that exact cam on the XE-R lobe <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

<small>[ April 08, 2002, 08:49 AM: Message edited by: Chris ARE 360 ]</small>

Jason99T/A

iTrader: (21)

Patrick, I replied to your email. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

Z00

This cam sounds sweet. Can I get this under the gp that's going on now? Sounds like a good cam and probably wouldn't have to change cams if I put a turbo on either.

<small>[ April 08, 2002, 02:24 PM: Message edited by: Z00 ]</small>

Terry Burger

iTrader: (4)

Intake biased split is a neat idea, but I think we all know this intake manifold isn't as bad as we let on. More work with the holley intake will tell soon.

Nickn20

looks like someone is trying to figure out these motors and sharing <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> keep up the good work guys!

Jason99T/A

iTrader: (21)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Z00:
<strong>This cam sounds sweet. Can I get this under the gp that's going on now? Sounds like a good cam and probably wouldn't have to change cams if I put a turbo on either.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Yep, you can purchase this cam on the cam GP. The cam is still in its experimental stages, so we can't really guarantee any hp/tq numbers until we get the cam in a few more cars. I'd be curious to see how it works in your turbo application down the road. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />