Question on split pattern vs single pattern...
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*Bad Trader*
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Question on split pattern vs single pattern... ....does it really make a dam bit of differnce either way, i mean for an increase of 1-10hp or 50-200rpm(idle)is it really worth banging your head to choose either way, i personlly have a 218-224-.561-.569 114. would'nt it come down more to your preferance in idle quality or wheater or notyou accually need that extra duration, wich brings me to my other topic, why would someone need the extra exaust duration (i got my cam for cheap, thats why i got it,lol). just wanted to start this topic so we could discuss it some more <img src="graemlins/gr_cheers.gif" border="0" alt="[cheers]" />
[ January 10, 2002: Message edited by: Grinch(supra killa) ]</p>
[ January 10, 2002: Message edited by: Grinch(supra killa) ]</p>
Launching!
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Re: Question on split pattern vs single pattern... [quote]Originally posted by RPM WS6:
<strong>I think split pattern cams would only really be beneficial in non-header or blower/turbo/N2O applications like Ragtop said. Even stock LS1 heads flow so well that the extra duration on the exhaust side really isn’t needed unless one of the above apply. I did some research in this area when I was first choosing a cam, and it seems that for an NA LS1 with headers, single is the best bet for idle quality and the lack of necessity of the extra exhaust duration.
Now, if you were working with something like old L98 heads that flowed poorly, then the extra exhaust duration would probably help. I learned that doing a mild build up on an old Formula.</strong><hr></blockquote>
From a dummy who's trying to learn:
My intention is to use stock heads with cam and Grots, NA. So then I should be concerned only with single duration cams because the stock heads flow quite well?
<strong>I think split pattern cams would only really be beneficial in non-header or blower/turbo/N2O applications like Ragtop said. Even stock LS1 heads flow so well that the extra duration on the exhaust side really isn’t needed unless one of the above apply. I did some research in this area when I was first choosing a cam, and it seems that for an NA LS1 with headers, single is the best bet for idle quality and the lack of necessity of the extra exhaust duration.
Now, if you were working with something like old L98 heads that flowed poorly, then the extra exhaust duration would probably help. I learned that doing a mild build up on an old Formula.</strong><hr></blockquote>
From a dummy who's trying to learn:
My intention is to use stock heads with cam and Grots, NA. So then I should be concerned only with single duration cams because the stock heads flow quite well?
Joined: Nov 2001
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From: Schiller Park, ILL Member: #317
Re: Question on split pattern vs single pattern... [quote]Originally posted by Silver99Z:
<strong>
From a dummy who's trying to learn:
My intention is to use stock heads with cam and Grots, NA. So then I should be concerned only with single duration cams because the stock heads flow quite well?</strong><hr></blockquote>
If you’re going to be running headers and not using a power adder, then I see no real benefit to using a split cam. All you’d be doing by using a split cam is degrading your idle somewhat. Some may argue that ALL stock heads need help on the exhaust side, and some agree that LS1 heads are not a part of that group because of their amazing flow capabilities. Either way you look at it, here are the facts (as I’ve seen repeated many, many times on this board): a 218/218 cam will make more power than a 216/220 cam with all other specs being the same. A 220/220 cam will make more power than a 218/222 would with the same specs otherwise, etc. Plus, the idle quality of single patterns is better, and if you look at the guys running single cams on this board (or others) the single cams have MORE than proven themselves. These are the reasons that I chose a single pattern cam.
Not to say that splits can’t perform (I’ve used them in the past on older SBCs), but I think the ticket on LS1s (stock or ported heads) is single patterns for mostly NA motors.
[ January 10, 2002: Message edited by: RPM WS6 ]</p>
<strong>
From a dummy who's trying to learn:
My intention is to use stock heads with cam and Grots, NA. So then I should be concerned only with single duration cams because the stock heads flow quite well?</strong><hr></blockquote>
If you’re going to be running headers and not using a power adder, then I see no real benefit to using a split cam. All you’d be doing by using a split cam is degrading your idle somewhat. Some may argue that ALL stock heads need help on the exhaust side, and some agree that LS1 heads are not a part of that group because of their amazing flow capabilities. Either way you look at it, here are the facts (as I’ve seen repeated many, many times on this board): a 218/218 cam will make more power than a 216/220 cam with all other specs being the same. A 220/220 cam will make more power than a 218/222 would with the same specs otherwise, etc. Plus, the idle quality of single patterns is better, and if you look at the guys running single cams on this board (or others) the single cams have MORE than proven themselves. These are the reasons that I chose a single pattern cam.
Not to say that splits can’t perform (I’ve used them in the past on older SBCs), but I think the ticket on LS1s (stock or ported heads) is single patterns for mostly NA motors.
[ January 10, 2002: Message edited by: RPM WS6 ]</p>
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Re: Question on split pattern vs single pattern... so what ur saying is a split pattern is ONLY good IF we use a power adder ie N20 or blower) my initial argument was i dont really see the need to go nuts trying to decide on one when the diffrence in the 2 (split vs single) is so minimal. what it really comes down to is idle/sound quality, (wich is what MOST people want anyway). so a split pattern is good for power adders and a single is good for NA an occational power adder? am i right (remember,we are conserned with LS1s nothing eles) i run mostly n20 (while racing) so i chose the split (not to mention i got a good deal anyway) <img src="graemlins/gr_punch.gif" border="0" alt="[fight]" />
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From: Schiller Park, ILL Member: #317
Re: Question on split pattern vs single pattern... [quote]Originally posted by Grinch(supra killa):
<strong>so a split pattern is good for power adders and a single is good for NA an occational power adder? </strong><hr></blockquote>
Yes, this is my feeling on the subject. I think many others here will agree...
<strong>so a split pattern is good for power adders and a single is good for NA an occational power adder? </strong><hr></blockquote>
Yes, this is my feeling on the subject. I think many others here will agree...
Launching!
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Re: Question on split pattern vs single pattern... RPM WS6,
Thanks for the reply. You said that single duration cams have proven themselves, and that's what I'm looking for - a setup that's proven. I printed out Raughhamer's info from his site and singled out those setups that had no headwork. The first thing that came to my attention was the large number of single duration cams being used.
Thanks for the reply. You said that single duration cams have proven themselves, and that's what I'm looking for - a setup that's proven. I printed out Raughhamer's info from his site and singled out those setups that had no headwork. The first thing that came to my attention was the large number of single duration cams being used.
Re: Question on split pattern vs single pattern... Extra exhaust duration is helpful if you do not have headers or with NOS or a blower.
I think your point about tradeoffs is a good one. To gain the last 10hp from a cam, people frequently give up a fair amount of idle quality and mileage. I guess it depends on your goals.
I think your point about tradeoffs is a good one. To gain the last 10hp from a cam, people frequently give up a fair amount of idle quality and mileage. I guess it depends on your goals.
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Thread Starter
*Bad Trader*
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Re: Question on split pattern vs single pattern... the main reason i want to know is cuz i have the cam mentioned above but i have longtubes and im back on stocks heads for a while will i still the results im used to.
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Verdad Gallardo Joined: Nov 2001
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From: Schiller Park, ILL Member: #317
Re: Question on split pattern vs single pattern... I think split pattern cams would only really be beneficial in non-header or blower/turbo/N2O applications like Ragtop said. Even stock LS1 heads flow so well that the extra duration on the exhaust side really isn’t needed unless one of the above apply. I did some research in this area when I was first choosing a cam, and it seems that for an NA LS1 with headers, single is the best bet for idle quality and the lack of necessity of the extra exhaust duration.
Now, if you were working with something like old L98 heads that flowed poorly, then the extra exhaust duration would probably help. I learned that doing a mild build up on an old Formula.
Now, if you were working with something like old L98 heads that flowed poorly, then the extra exhaust duration would probably help. I learned that doing a mild build up on an old Formula.
Joined: Nov 2001
Posts: 34,623
Likes: 2,541
From: Schiller Park, ILL Member: #317
Re: Question on split pattern vs single pattern... [quote]Originally posted by Silver99Z:
<strong>RPM WS6,
I printed out Raughhamer's info from his site and singled out those setups that had no headwork. The first thing that came to my attention was the large number of single duration cams being used.</strong><hr></blockquote>
EXACTLY! <img src="gr_stretch.gif" border="0"> That cam page is VERY helpful in finding the combos that have really worked from the guys that are using them. <img src="gr_images/icons/wink.gif" border="0">
Single duration really seems to be the hot ticket for na LS1s when you look at the large majority of results from guys using them.
<strong>RPM WS6,
I printed out Raughhamer's info from his site and singled out those setups that had no headwork. The first thing that came to my attention was the large number of single duration cams being used.</strong><hr></blockquote>
EXACTLY! <img src="gr_stretch.gif" border="0"> That cam page is VERY helpful in finding the combos that have really worked from the guys that are using them. <img src="gr_images/icons/wink.gif" border="0">
Single duration really seems to be the hot ticket for na LS1s when you look at the large majority of results from guys using them.
