Turbo Guys - What Cam?
Re: Turbo Guys - What Cam? Typically, the cam isn't as great of a concern on an FI car, but the most will agree that a split pattern cam with more exhaust duration will be better. Helps scavenge exhaust. No need to assist on the intake side because of the FI.
I am pulling my cam in the next 10 days or so if you're interested.
Comp 218/224 .561/.569 114 LSA (3000 miles)
$300 shipped
<small>[ August 06, 2002, 09:40 AM: Message edited by: Reckless ]</small>
I am pulling my cam in the next 10 days or so if you're interested.
Comp 218/224 .561/.569 114 LSA (3000 miles)
$300 shipped
<small>[ August 06, 2002, 09:40 AM: Message edited by: Reckless ]</small>
Re: Turbo Guys - What Cam? Ryan...explain the reasoning? Why would you want to increase cylinder pressure with forced induction? I don't think a reverse pattern split cam is recommended for anything except NA engines. Of course, I could be wrong <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
Todd
Todd
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Re: Turbo Guys - What Cam? im not a big fi guy...im going by what comp has recommended in the past and what ive seen here. my simple logic tells me that with an exhaust driven turbo the exhaust side is emptied very quickly, thereby not necessitating a long opening of the exh. valve; and the point of the greater intake side is simply to keep the cyl. full. at high rpms when that turbo is cookin..you dont want a weakly full cylinder do ya?
i could be wrong as well.
Harlan??
i could be wrong as well.
Harlan??
Re: Turbo Guys - What Cam? LPE uses a 205/212/5xx/5xx/116 on their Twin Turbos...even the 725hp package...they minimize overlap to keep the intake charge from blowing out the exhaust valve.
Re: Turbo Guys - What Cam? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by DenzSS:
<strong>Just curious Harlan, why are you going with the 112? Are you going with 112 to bring the power in a little earlier with the 228 duration? I'm heading toward a single turbo setup. My heads should be done soon, so I'm trying to figure out the cam specs.
Denz</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">It's more for some relief on the mid range cylinder pressure. Easier to keep the heads on that way <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
<strong>Just curious Harlan, why are you going with the 112? Are you going with 112 to bring the power in a little earlier with the 228 duration? I'm heading toward a single turbo setup. My heads should be done soon, so I'm trying to figure out the cam specs.
Denz</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">It's more for some relief on the mid range cylinder pressure. Easier to keep the heads on that way <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
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Re: Turbo Guys - What Cam? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by y2khawk:
<strong>
my new cam: 228/224 .537/.534 112</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Cool, that's about what I was thinking. What does Rob Raymer run in his?
<strong>
my new cam: 228/224 .537/.534 112</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Cool, that's about what I was thinking. What does Rob Raymer run in his?
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From: Kansas City, MO
Re: Turbo Guys - What Cam? If I remember correctly, Ryan is correct. SC and Nitrous like a traditional split. Turbo is either single pattern or reverse split. I know some turbo guys(non-LS1) use reverse splits with great results.
Re: Turbo Guys - What Cam? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Ryan:
[QB my simple logic tells me that with an exhaust driven turbo the exhaust side is emptied very quickly, thereby not necessitating a long opening of the exh. valve; and the point of the greater intake side is simply to keep the cyl. full. at high rpms when that turbo is cookin..you dont want a weakly full cylinder do ya?
i could be wrong as well.
Harlan??[/QB]</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Not exactly. With a turbo you've got big back pressure. Which is quite the opposite when you talk about say a SC setup with headers and a nice open exhaust.
The idea it to get as much into the cylinder while you can, long intake duration. And keep the exhaust duration tighter to try and keep some of the post combustion energy in the exhaust pulse.
But, if your doing one i will say single pattern or reverse split. My stock cam did quite well before <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
my new cam: 228/224 .537/.534 112
[QB my simple logic tells me that with an exhaust driven turbo the exhaust side is emptied very quickly, thereby not necessitating a long opening of the exh. valve; and the point of the greater intake side is simply to keep the cyl. full. at high rpms when that turbo is cookin..you dont want a weakly full cylinder do ya?
i could be wrong as well.
Harlan??[/QB]</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Not exactly. With a turbo you've got big back pressure. Which is quite the opposite when you talk about say a SC setup with headers and a nice open exhaust.
The idea it to get as much into the cylinder while you can, long intake duration. And keep the exhaust duration tighter to try and keep some of the post combustion energy in the exhaust pulse.
But, if your doing one i will say single pattern or reverse split. My stock cam did quite well before <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
my new cam: 228/224 .537/.534 112
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From: Kansas City, MO
Re: Turbo Guys - What Cam? Just curious Harlan, why are you going with the 112? Are you going with 112 to bring the power in a little earlier with the 228 duration? I'm heading toward a single turbo setup. My heads should be done soon, so I'm trying to figure out the cam specs.
Denz
Denz