Potential cam for project Evil Twin
Thread Starter
TECH Veteran
iTrader: (5)
Joined: Nov 2001
Posts: 4,491
Likes: 1
From: Olmsted Falls, OH
Potential cam for project Evil Twin Might have a deal going through for this cam, cheap <img src="gr_grin.gif" border="0">
.564 .554 228/224 112lsa
LSA might be a tad bit tight, but the "heavy on the intake" bias of the split pattern is what i was after.
word has it turbos like a little more intake than exhaust. They are a different beast than a blower after all.
What ya think?? <img src="gr_images/icons/cool.gif" border="0">
.564 .554 228/224 112lsa
LSA might be a tad bit tight, but the "heavy on the intake" bias of the split pattern is what i was after.
word has it turbos like a little more intake than exhaust. They are a different beast than a blower after all.
What ya think?? <img src="gr_images/icons/cool.gif" border="0">
Adkoonerstrator
iTrader: (4)
Joined: Nov 2001
Posts: 21,420
Likes: 0
From: Deep in the seedy underworld of Koonerville
Re: Potential cam for project Evil Twin Your only running 12psi? Hmmph....Then why are you a forum director for the "High Pressure Area" <img src="gr_tounge.gif" border="0"> <img src="gr_images/icons/wink.gif" border="0"> <img src="gr_grin.gif" border="0"> Hahaha
That cam sounds interesting. Whats the argument for turbos liking more intake? Just wondering cause I don't know a whole lot about those turboooooos. Also, doesn't a tight LSA bleed off cylinder pressure.
You should change your license plate to "EVLTWNS" <img src="gr_grin.gif" border="0">
That car is gonna be bad *** no matter what cam goes in.
Johnnie <img src="graemlins/gr_chug.gif" border="0" alt="[chug]" />
That cam sounds interesting. Whats the argument for turbos liking more intake? Just wondering cause I don't know a whole lot about those turboooooos. Also, doesn't a tight LSA bleed off cylinder pressure.
You should change your license plate to "EVLTWNS" <img src="gr_grin.gif" border="0">
That car is gonna be bad *** no matter what cam goes in.
Johnnie <img src="graemlins/gr_chug.gif" border="0" alt="[chug]" />
9 Second Club
Joined: Nov 2001
Posts: 1,445
Likes: 0
From: Bay Area, CA
Re: Potential cam for project Evil Twin [quote]Originally posted by turbo:
<strong>Ummm, because the turbos are pushing a lot of air so the cam would make it easier on the whole system with the air coming in.
Casey</strong><hr></blockquote>
yea but you are forcing all that air in, where does it all go? you have a cam with a smaller duration on the exhaust side, where does all the air go? wouldnt this cost HP?
<strong>Ummm, because the turbos are pushing a lot of air so the cam would make it easier on the whole system with the air coming in.
Casey</strong><hr></blockquote>
yea but you are forcing all that air in, where does it all go? you have a cam with a smaller duration on the exhaust side, where does all the air go? wouldnt this cost HP?
Adkoonerstrator
iTrader: (4)
Joined: Nov 2001
Posts: 21,420
Likes: 0
From: Deep in the seedy underworld of Koonerville
Re: Potential cam for project Evil Twin [quote]Originally posted by Nickn20:
<strong>
yea but you are forcing all that air in, where does it all go? you have a cam with a smaller duration on the exhaust side, where does all the air go? wouldnt this cost HP?</strong><hr></blockquote>
This is what I'm wondering. Plus at a given pressure can't you only fill the cylinders a certain amount anyways. Like I said just wondering. <img src="gr_stretch.gif" border="0">
Merry Christmas everybody <img src="graemlins/gr_xmas.gif" border="0" alt="[santa]" />
[ December 24, 2001: Message edited by: XLR8NSS ]</p>
<strong>
yea but you are forcing all that air in, where does it all go? you have a cam with a smaller duration on the exhaust side, where does all the air go? wouldnt this cost HP?</strong><hr></blockquote>
This is what I'm wondering. Plus at a given pressure can't you only fill the cylinders a certain amount anyways. Like I said just wondering. <img src="gr_stretch.gif" border="0">
Merry Christmas everybody <img src="graemlins/gr_xmas.gif" border="0" alt="[santa]" />
[ December 24, 2001: Message edited by: XLR8NSS ]</p>
Re: Potential cam for project Evil Twin Hes increasing everything over stock cam with that grind, intake and exhaust. Yes the intake is more than exhaust but with a turbocharged car thats fine. Exhaust gases flow easier than the intake, hince the reason for more intake on the cam.
The cam should really help his restriction passed 5,000rpm.
<img src="graemlins/gr_xmas.gif" border="0" alt="[santa]" /> Merry Christmas!
Casey
[ December 24, 2001: Message edited by: turbo ]</p>
The cam should really help his restriction passed 5,000rpm.
<img src="graemlins/gr_xmas.gif" border="0" alt="[santa]" /> Merry Christmas!
Casey
[ December 24, 2001: Message edited by: turbo ]</p>
Trending Topics
Re: Potential cam for project Evil Twin i had a cam set up like that.. i liked it fine.. no one else seemed to though.. but i'm sure comp knew what they were doing when they ground it for me. good luck to you with it.
the i/e characteristics are to build boost better with more exhaust velocity
the i/e characteristics are to build boost better with more exhaust velocity
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
SSU Moderator
Joined: Nov 2001
Posts: 4,857
Likes: 0
From: Austin, TX
Re: Potential cam for project Evil Twin maybe the turbo scavenges the exhaust gases out quickly so one doesnt need big duration on the exhaust side? <img src="images/icons/confused.gif" border="0"> and the big intake duration will fill the cylinders and keep the boost up. makes sense i think.
Ryan
Ryan
9 Second Club
Joined: Nov 2001
Posts: 1,445
Likes: 0
From: Bay Area, CA
Re: Potential cam for project Evil Twin [quote]Originally posted by turbo:
<strong>Hes increasing everything over stock cam with that grind, intake and exhaust. Yes the intake is more than exhaust but with a turbocharged car thats fine. Exhaust gases flow easier than the intake, hince the reason for more intake on the cam.
The cam should really help his restriction passed 5,000rpm.
<img src="graemlins/gr_xmas.gif" border="0" alt="[santa]" /> Merry Christmas!
Casey
[ December 24, 2001: Message edited by: turbo ]</strong><hr></blockquote>
ok this makes a little more sense.... increasing everything over a stock cam made is click for me think, basically the intake is pretty much overkill, but why not make it easier on the turbos to get the air in there, since its gonna force it in there anyway. as far as the exhaust goes maybe with the big intake duration its gonna overlap enough to push the exhaust out with the intake charge..... sounds good to me! <img src="gr_grin.gif" border="0">
<strong>Hes increasing everything over stock cam with that grind, intake and exhaust. Yes the intake is more than exhaust but with a turbocharged car thats fine. Exhaust gases flow easier than the intake, hince the reason for more intake on the cam.
The cam should really help his restriction passed 5,000rpm.
<img src="graemlins/gr_xmas.gif" border="0" alt="[santa]" /> Merry Christmas!
Casey
[ December 24, 2001: Message edited by: turbo ]</strong><hr></blockquote>
ok this makes a little more sense.... increasing everything over a stock cam made is click for me think, basically the intake is pretty much overkill, but why not make it easier on the turbos to get the air in there, since its gonna force it in there anyway. as far as the exhaust goes maybe with the big intake duration its gonna overlap enough to push the exhaust out with the intake charge..... sounds good to me! <img src="gr_grin.gif" border="0">
Thread Starter
TECH Veteran
iTrader: (5)
Joined: Nov 2001
Posts: 4,491
Likes: 1
From: Olmsted Falls, OH
Re: Potential cam for project Evil Twin Well, home for the holidays so internet is the last thing for the day <img src="gr_stretch.gif" border="0">
The understanding i get from the increase in intake over exhaust is the added backpressure created from the turbos themselves.
The number i remember, not sure why, is about 1.5x the intake pressure is the exhaust pressure. I don't think that's exactly right, but it may be.
With a blower, you want to open up the exhaust as much as you can. Big duration/lift, headers, etc.
With a turbo, you can't because of the turbine. But you want to open up the intake to get the air in while the exhaust side is closed. Get the most in while it's "easiest"
I'm thinking the shorter exhaust duration will keep the velocity up too.
This info was coming from a very knowledgeable turbo guy i know. Seems this was the approach taken by the GN crowd when making sersious numbers.
I think it'll help my intake path for sure. But i still think the manifold is gonna hold me back.
Time will tell.
But at least santa brought me a fire jacket this christmas, and a nice summit gift cert. to put toward my fuel system <img src="gr_grin.gif" border="0">
happy holidays
The understanding i get from the increase in intake over exhaust is the added backpressure created from the turbos themselves.
The number i remember, not sure why, is about 1.5x the intake pressure is the exhaust pressure. I don't think that's exactly right, but it may be.
With a blower, you want to open up the exhaust as much as you can. Big duration/lift, headers, etc.
With a turbo, you can't because of the turbine. But you want to open up the intake to get the air in while the exhaust side is closed. Get the most in while it's "easiest"
I'm thinking the shorter exhaust duration will keep the velocity up too.
This info was coming from a very knowledgeable turbo guy i know. Seems this was the approach taken by the GN crowd when making sersious numbers.
I think it'll help my intake path for sure. But i still think the manifold is gonna hold me back.
Time will tell.
But at least santa brought me a fire jacket this christmas, and a nice summit gift cert. to put toward my fuel system <img src="gr_grin.gif" border="0">
happy holidays
Staging Lane
Joined: Dec 2001
Posts: 63
Likes: 0
From: Nationwide
Re: Potential cam for project Evil Twin The turbos create large backpressure in the exhaust tract. If we open the exhaust valve too soon or keep it open too late in the combustion cycle the exhaust starts to go in the wrong direction. Turbos Like tighter lobes around say 112. The short exhaust lobe on this can will keep overlap about the same as a 114 cam with a long exhaust lobe. It will work very weill in your application
Mike Licht
Mike Licht
Adkoonerstrator
iTrader: (4)
Joined: Nov 2001
Posts: 21,420
Likes: 0
From: Deep in the seedy underworld of Koonerville
Re: Potential cam for project Evil Twin [quote]Originally posted by Ramchargers:
<strong>The turbos create large backpressure in the exhaust tract. If we open the exhaust valve too soon or keep it open too late in the combustion cycle the exhaust starts to go in the wrong direction. Turbos Like tighter lobes around say 112. The short exhaust lobe on this can will keep overlap about the same as a 114 cam with a long exhaust lobe. It will work very weill in your application
Mike Licht</strong><hr></blockquote>
Great explanation Mike. <img src="gr_stretch.gif" border="0"> Thanks!
<strong>The turbos create large backpressure in the exhaust tract. If we open the exhaust valve too soon or keep it open too late in the combustion cycle the exhaust starts to go in the wrong direction. Turbos Like tighter lobes around say 112. The short exhaust lobe on this can will keep overlap about the same as a 114 cam with a long exhaust lobe. It will work very weill in your application
Mike Licht</strong><hr></blockquote>
Great explanation Mike. <img src="gr_stretch.gif" border="0"> Thanks!
Re: Potential cam for project Evil Twin [quote]Originally posted by y2khawk:
<strong>Might have a deal going through for this cam, cheap <img src="gr_grin.gif" border="0">
.564 .554 228/224 112lsa
What ya think?? <img src="gr_images/icons/cool.gif" border="0"> </strong><hr></blockquote>
Is anyone running this? I want my car to have something of a lope at idle but with great throttle response. I don't need performance beyond 6k rpm.
GP??
<strong>Might have a deal going through for this cam, cheap <img src="gr_grin.gif" border="0">
.564 .554 228/224 112lsa
What ya think?? <img src="gr_images/icons/cool.gif" border="0"> </strong><hr></blockquote>
Is anyone running this? I want my car to have something of a lope at idle but with great throttle response. I don't need performance beyond 6k rpm.
GP??
On The Tree
Joined: Nov 2001
Posts: 139
Likes: 0
Re: Potential cam for project Evil Twin I think there is a reason not many people go bigger than 224 on these. With good flowing heads and a decent cam you are fine. Are you planning any other engine mods besides the cam?
What was Godspeed running on his 385 HO SS TT? He was making great power at low boost.
What was Godspeed running on his 385 HO SS TT? He was making great power at low boost.
Thread Starter
TECH Veteran
iTrader: (5)
Joined: Nov 2001
Posts: 4,491
Likes: 1
From: Olmsted Falls, OH
Re: Potential cam for project Evil Twin [quote]Originally posted by ls1fun:
<strong>I think there is a reason not many people go bigger than 224 on these. With good flowing heads and a decent cam you are fine. Are you planning any other engine mods besides the cam?
What was Godspeed running on his 385 HO SS TT? He was making great power at low boost.</strong><hr></blockquote>
Not sure what Jeremy was running. Tough to compare his "boost" though. I'm running the smaller turbos on less cubes.
Built to hell motor is the plan <img src="gr_grin.gif" border="0">
low boost is a relative term <img src="gr_images/icons/wink.gif" border="0">
<strong>I think there is a reason not many people go bigger than 224 on these. With good flowing heads and a decent cam you are fine. Are you planning any other engine mods besides the cam?
What was Godspeed running on his 385 HO SS TT? He was making great power at low boost.</strong><hr></blockquote>
Not sure what Jeremy was running. Tough to compare his "boost" though. I'm running the smaller turbos on less cubes.
Built to hell motor is the plan <img src="gr_grin.gif" border="0">
low boost is a relative term <img src="gr_images/icons/wink.gif" border="0">
On The Tree
Joined: Nov 2001
Posts: 139
Likes: 0
Re: Potential cam for project Evil Twin Okay about half your boost (6.5 vs. 12) and more power. I think with the bigger cam you are just robbing yourself of off idle power and not helping the boost power. And yes 'bigger' is a relative term also! <img src="gr_stretch.gif" border="0">
Thread Starter
TECH Veteran
iTrader: (5)
Joined: Nov 2001
Posts: 4,491
Likes: 1
From: Olmsted Falls, OH
Re: Potential cam for project Evil Twin true, but remember boost is what is left over <img src="gr_stretch.gif" border="0">
plus, the same boost on different turbos is not the same flow. And more cubes is a whole different story.
I made about the same upper RPM HP on 10 as i did w/ 12. I'm hitting a restriction in the intake system. Where is the question.
you can't really compare the two setups: built motor w/ heads and cam and bigger turbos vs stock motor w/ stock heads and cam and smaller turbos.
plus, i'm not loosing any money on it. Not money involved, just a weekend of work in the garage. If it don't work, i'll try something else <img src="gr_stretch.gif" border="0">
plus, the same boost on different turbos is not the same flow. And more cubes is a whole different story.
I made about the same upper RPM HP on 10 as i did w/ 12. I'm hitting a restriction in the intake system. Where is the question.
you can't really compare the two setups: built motor w/ heads and cam and bigger turbos vs stock motor w/ stock heads and cam and smaller turbos.
plus, i'm not loosing any money on it. Not money involved, just a weekend of work in the garage. If it don't work, i'll try something else <img src="gr_stretch.gif" border="0">
On The Tree
Joined: Nov 2001
Posts: 139
Likes: 0
Re: Potential cam for project Evil Twin [quote]Originally posted by y2khawk:
<strong>you can't really compare the two setups: built motor w/ heads and cam and bigger turbos vs stock motor w/ stock heads and cam and smaller turbos.
</strong><hr></blockquote>
This is the part that is complete BS! <img src="graemlins/gr_bs.gif" border="0" alt="[bullshit]" />
You know you aren't going to leave all those parts stock for long! <img src="graemlins/gr_devil.gif" border="0" alt="[devil]" /> <img src="images/icons/rolleyes.gif" border="0">
I am sure whatever you do it will turn out well eventually with your persistence and skill/hardwork! <img src="graemlins/fluffy.gif" border="0" alt="[Fluffy]" />
<strong>you can't really compare the two setups: built motor w/ heads and cam and bigger turbos vs stock motor w/ stock heads and cam and smaller turbos.
</strong><hr></blockquote>
This is the part that is complete BS! <img src="graemlins/gr_bs.gif" border="0" alt="[bullshit]" />
You know you aren't going to leave all those parts stock for long! <img src="graemlins/gr_devil.gif" border="0" alt="[devil]" /> <img src="images/icons/rolleyes.gif" border="0">
I am sure whatever you do it will turn out well eventually with your persistence and skill/hardwork! <img src="graemlins/fluffy.gif" border="0" alt="[Fluffy]" />
Thread Starter
TECH Veteran
iTrader: (5)
Joined: Nov 2001
Posts: 4,491
Likes: 1
From: Olmsted Falls, OH
Re: Potential cam for project Evil Twin LMAO
I had my fun w/ a stock motor for sure.
but, it's still a valid arguement <img src="gr_stretch.gif" border="0"> you can't simply compare boost. Now if you gave me flow numbers, that would be different. <img src="graemlins/gr_judge.gif" border="0" alt="[judgement]" />
I'm done w/ stock motors <img src="gr_grin.gif" border="0">
After watching, in the same room <img src="gr_eek2.gif" border="0"> , a twin t-63 q-trim GN w/ a 4.1 liter indy block lay down 1100 RWHP through a TH400 and a 9" at 25 psi, i have inspiration to remain stock cubes.
Nothing like a weed wacker on roids to get you motivated. 6 cyl's just sound funny <img src="gr_images/icons/wink.gif" border="0">
I will break things, and the only way to learn is to try. And hopfully not have to sell my first born for mod money <img src="graemlins/gr_devil.gif" border="0" alt="[devil]" />
I had my fun w/ a stock motor for sure.
but, it's still a valid arguement <img src="gr_stretch.gif" border="0"> you can't simply compare boost. Now if you gave me flow numbers, that would be different. <img src="graemlins/gr_judge.gif" border="0" alt="[judgement]" />
I'm done w/ stock motors <img src="gr_grin.gif" border="0">
After watching, in the same room <img src="gr_eek2.gif" border="0"> , a twin t-63 q-trim GN w/ a 4.1 liter indy block lay down 1100 RWHP through a TH400 and a 9" at 25 psi, i have inspiration to remain stock cubes.
Nothing like a weed wacker on roids to get you motivated. 6 cyl's just sound funny <img src="gr_images/icons/wink.gif" border="0">
I will break things, and the only way to learn is to try. And hopfully not have to sell my first born for mod money <img src="graemlins/gr_devil.gif" border="0" alt="[devil]" />