Any Experience with Reverse Split Cams?

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Dec 13, 2002 | 08:18 PM

98_WS6_M6

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From: NW Indiana

Any Experience with Reverse Split Cams?

Has anyone had any experience with reverse split cams? If anyone knows the benefits over a regular cam please share the knowledge. Thanks.

Dec 13, 2002 | 08:20 PM

wolfman jack

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From: brainerd mn

Re: Any Experience with Reverse Split Cams?

what do you mean by reverse split?

Dec 13, 2002 | 08:25 PM

Onyx LS1

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From: Austin

Re: Any Experience with Reverse Split Cams?

LS1 head exhaust ports flow extremely well so a reverse split evens out the restricted intake with the exhaust. A revese split cam simply gives the intake more duration than the exhaust which increases top end while saving a little low end power.

Dec 13, 2002 | 09:59 PM

wolfman jack

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From: brainerd mn

Re: Any Experience with Reverse Split Cams?

corect me if i am wrong but you still want to keep a 100 to 80-85% intake to exhaust flow ratio and this should work best with a single profile cam

Dec 14, 2002 | 10:52 AM

Colonel

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From: Troy, AL

Re: Any Experience with Reverse Split Cams?

Not the case with the LS1. The reverse split cams are showing awesome results over the single pattern cams.

Remember, the LS1 is intake manifold restricted. This becomes more pronounced with bigger cams, ported heads, and high flowing exhaust systems.

Dec 14, 2002 | 05:26 PM

Raughammer

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From: Houston Raceway Park...in TEXAS.

Re: Any Experience with Reverse Split Cams?

Sanders is speaking gospel.

Take it from me. <img border="0" alt="[angel]" title="" src="graemlins/gr_angel.gif" />

Dec 14, 2002 | 06:51 PM

383ss

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Re: Any Experience with Reverse Split Cams?

went from a single pattern to reverse split and gained all across the board with +9rwhp +9rwtq peak

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Dec 16, 2002 | 09:22 PM

BIGBOS

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From: Chi-Town, IL

Re: Any Experience with Reverse Split Cams?

I'm running the MTI "X1" cam...

230/227 .591/.571 112lsa... <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Through a TH400 with a nonlocking 3500 converter and 3.73's, and MTI's stage 2 heads I trapped 117.5...

I love it, and it lopes hard... <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Dec 16, 2002 | 09:25 PM

#10

Z06Cam

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From: Haughton, LA

Re: Any Experience with Reverse Split Cams?

<blockquote>quote:<hr />Originally posted by nossty1:
Do you mean like the TR230/224 111lsa is this a good cam to have without heads? I plan on doing heads in the future but want power now without heads until i get thae.<hr /></blockquote>That's a great cam with stock or ported heads. LS1's have been making 410-ish rwhp with stock heads, and close to 450 with good stage 2 heads.

I'm running the TR227/224 114lsa "reverse split" cam. I chose this cam because it only gives up about 5rwhp vs. the TR230/224 and has better drivability. I'm putting down the dyno numbers in my sig with stock LS6 heads and full exhaust. With a single pattern cam I'm sure my numbers would be lower.

Dec 17, 2002 | 08:46 AM

#11

2001 Pewter WS6

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From: Pittsburgh, PA

Re: Any Experience with Reverse Split Cams?

<blockquote>quote:<hr /> I'm running the MTI "X1" cam...

230/227 .591/.571 112lsa...

Through a TH400 with a nonlocking 3500 converter and 3.73's, and MTI's stage 2 heads I trapped 117.5...
<hr /></blockquote>I have stock heads a 220/226 cam and the bolt ons with full interior and trapped 11.60 @ 115 with a Vig 3200. I have a set of Absolute Speed heads ordered and should be here soon and am debating on a cam as well. I would have expected a higher trap speed out of that X1 cam.

Dec 17, 2002 | 11:02 AM

#12

Jason99T/A

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From: Baton Rouge, LA

Re: Any Experience with Reverse Split Cams?

<blockquote>quote:<hr />Originally posted by nossty1:
Do you mean like the TR230/224 111lsa is this a good cam to have without heads? I plan on doing heads in the future but want power now without heads until i get thae.<hr /></blockquote>See sig.. I was very happy with mine using stock heads. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Dec 17, 2002 | 04:18 PM

#13

SPANKY LS1

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From: Seneca, SC

Re: Any Experience with Reverse Split Cams?

<blockquote>quote:<hr />Originally posted by 2001 Pewter WS6:
 <blockquote>quote:<hr /> I'm running the MTI "X1" cam...

230/227 .591/.571 112lsa...

Through a TH400 with a nonlocking 3500 converter and 3.73's, and MTI's stage 2 heads I trapped 117.5...
<hr /></blockquote>I have stock heads a 220/226 cam and the bolt ons with full interior and trapped 11.60 @ 115 with a Vig 3200. I have a set of Absolute Speed heads ordered and should be here soon and am debating on a cam as well. I would have expected a higher trap speed out of that X1 cam.<hr /></blockquote>117.5 through a TH400 (unlocked), and a 9" rear is pretty good, IMO. I believe his car is heavy also (~3600lbs)

Dec 17, 2002 | 04:27 PM

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VINCE

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From: Valrico, Florida

Re: Any Experience with Reverse Split Cams?

What are the advantages of the Reverse Split over a Traditional Split on ported heads..? One example would be TR230/224 against 230/236 XE-R? Both on the same lsa? Will they dyno the same peak horsepower and why would they not?

Dec 17, 2002 | 08:27 PM

#15

BIGBOS

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From: Chi-Town, IL

Re: Any Experience with Reverse Split Cams?

Yea, I thought almost 118 was damn good MPH for a TH400 car with an non locking 3500 stall, going through a 12-bolt...w/3.73's...

I weighed 266 when I last raced the car, I weigh 230 now, and still dropping, by the time spring comes around I will most likely be down to 190...good race weight for me... <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> ...the car has welds all around, removed from sway bar, removed A/C, Spare/Jack...

Not sure, but the race weight was probably close to 3600 or even higher...

Dec 17, 2002 | 09:15 PM

#16

VINCE

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From: Valrico, Florida

Re: Any Experience with Reverse Split Cams?

Can someone answer my above question? If not I would assume peeps just do not know and the advice that is usually given is just a guess anyway.. No one knows how a ls1 is going to respond I guess..

Dec 17, 2002 | 09:42 PM

#17

Camaroholic

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Re: Any Experience with Reverse Split Cams?

I was under the general impression that a loose exhaust (longtubes, free flowing Y or X, loose catback) along with the good flowing ports in the heads, give a good bias already towards the exhaust. Bolt on a poor flowing intake manifold (270-ish CFM through an LS6 on ported heads), and you need intake bias to make up for the good exhaust flow. IMHO, I think it's all in the intake manifold. Put a better intake on there (sheet metal) and you'll probably see the cam characteristics go back towards the traditional exhaust bias.

Now, anyone tried a solid roller reverse split on a 346 yet? How about a 242/236? <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

-Andrew

Dec 17, 2002 | 10:18 PM

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Jason99T/A

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From: Baton Rouge, LA

Re: Any Experience with Reverse Split Cams?

<blockquote>quote:<hr />Originally posted by Camaroholic:
Now, anyone tried a solid roller reverse split on a 346 yet? How about a 242/236? <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

-Andrew<hr /></blockquote>It's in testing right now in a certain motor... and no, it's not yours Andrew - yet. <img border="0" title="" alt="[Razz]" src="gr_tounge.gif" /> <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

Jason

Dec 17, 2002 | 10:26 PM

#19

VINCE

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From: Valrico, Florida

Re: Any Experience with Reverse Split Cams?

Most people do not go with a crazy exhaust system.. I still think you can benefit from a high intake duration and a even higher exhaust duration. Yes idle quality would suffer, but I see no negative side effects other than idle. It seems weird that going with a better exhaust system increases hp/tq throughout the powerband, but ls1 peeps feel that crutching an already lower flowing exhaust compared to intake does not benefit from getting the hot air out faster.. The more I read the old school rationale of doing a traditional split I understand why this benefits us as well. Our heads already flow well. Why not benefit from the technology that already exist. The funny thing is it works well for forced induction setups, but we do not think it would work well for NA setups.. The faster you can push something out of something the faster you can put something back in. Try sewing of your A-hole and keep eating and tell me what happens..

[ December 17, 2002, 10:28 PM: Message edited by: VINCE ]

Dec 18, 2002 | 07:28 AM

#20

Camaroholic

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From: Waco, TX

Re: Any Experience with Reverse Split Cams?

<img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> Jason? I have no idea what you're talking about. You must have me confused with someone else.

Vince, I think you missed my point. You can have a LS6 head that flows 330+ CFM on the intake (like Nine Ball's). Strap on a 270-280 CFM intake manifold, and what do you get... somewhere around 270-280 CFM.

You can have a nice set of heads (say, for example, 300 intake / 230 exhaust). That's a good 76% ratio. Now, strap on an intake manifold, and all fo the sudden your ratio isn't as good (270 / 230? That's a 85% ratio!).

Again, just my $.02, nothing to prove what I'm saying, just a thought.

Andrew

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