Ordering my Cam then Another Choice??
Drifting
Joined: Dec 2004
Posts: 1,714
Likes: 42
From: Austin Texas
I have enjoyed this discussion. I am interested in it because I already have the xe268. I have seen others who run this cam with an OD transmission and I am about to install a 2004R myself. So, please understand that I now need more info on the subject now.
65 mph with stock tires and a 2004R with lock up with a 3.55 or 3.70 is going to spin the motor about 2000 rpm.
I want to hear from others with this cam and overdrives and how the cam behaves and if they keep it in 3rd in town or what. (If I don't see anybody respond I will respectfully start a new thread on that subject)
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
NO! he has overdrive. He will turn MUCH LOWER rpm cruising around in 4th. Does his converter LOCK? Even less rpm.
I'd expect the xe268 to surge at 1000-2000 rpm in 4th locked due to excessive overlap. Maybe that can be tuned out, maybe not. No problem with the XE262H or the 270H with a fully divided dual plane. Excessive overlap (xe268) causes poor MPG, long warm-ups, and less power at normal street rpm's.
I'm an ASE certified mechanic(retired). Certified in ENGINE PERFORMANCE. People proud of their accomplishments use their real name, like Jeff(and me, and many others )
What are mako's qualifications?
I'd expect the xe268 to surge at 1000-2000 rpm in 4th locked due to excessive overlap. Maybe that can be tuned out, maybe not. No problem with the XE262H or the 270H with a fully divided dual plane. Excessive overlap (xe268) causes poor MPG, long warm-ups, and less power at normal street rpm's.
I'm an ASE certified mechanic(retired). Certified in ENGINE PERFORMANCE. People proud of their accomplishments use their real name, like Jeff(and me, and many others )
What are mako's qualifications?
My real name and experience are listed in my profile. Been building race and street cars for 40 years now. Still have no clue who Jeff is or why his opinion matters.
Last edited by 63mako; Nov 19, 2012 at 10:06 AM.
Race Director
Joined: Oct 2000
Posts: 15,057
Likes: 79
From: central FL, near the beach.
mako
Just google his name and spend a few hours reading his posts. I look for posters that do their own research and testing. Your Q was good enough that i PM'ed him for the first time. I gave his name/post as a source, rather than just giving my conclusion that the 270h is a great cam too. I have the 270h for 18 years in my 61, and i can't think of any way that a cam change can improve that combo. But, as i said before, i thought it was out of date. Since i was wrong about that, i provided my source. Jeff did back to back testing and he is a valuable source of information.
CompCams just released their new 4 pattern cams. Their job is to make money selling us new "state of the art" cams. They have to make them look really different to make the sale. They make logical arguments why the new cams are far superior. Guys like Jeff check them out to see if it is true.
Just google his name and spend a few hours reading his posts. I look for posters that do their own research and testing. Your Q was good enough that i PM'ed him for the first time. I gave his name/post as a source, rather than just giving my conclusion that the 270h is a great cam too. I have the 270h for 18 years in my 61, and i can't think of any way that a cam change can improve that combo. But, as i said before, i thought it was out of date. Since i was wrong about that, i provided my source. Jeff did back to back testing and he is a valuable source of information.
CompCams just released their new 4 pattern cams. Their job is to make money selling us new "state of the art" cams. They have to make them look really different to make the sale. They make logical arguments why the new cams are far superior. Guys like Jeff check them out to see if it is true.
Race Director
Joined: Oct 2000
Posts: 15,057
Likes: 79
From: central FL, near the beach.
Matt,
I have enjoyed this discussion. I am interested in it because I already have the xe268. I have seen others who run this cam with an OD transmission and I am about to install a 2004R myself. So, please understand that I now need more info on the subject now.
65 mph with stock tires and a 2004R with lock up with a 3.55 or 3.70 is going to spin the motor about 2000 rpm.
I want to hear from others with this cam and overdrives and how the cam behaves and if they keep it in 3rd in town or what. (If I don't see anybody respond I will respectfully start a new thread on that subject)
I have enjoyed this discussion. I am interested in it because I already have the xe268. I have seen others who run this cam with an OD transmission and I am about to install a 2004R myself. So, please understand that I now need more info on the subject now.
65 mph with stock tires and a 2004R with lock up with a 3.55 or 3.70 is going to spin the motor about 2000 rpm.
I want to hear from others with this cam and overdrives and how the cam behaves and if they keep it in 3rd in town or what. (If I don't see anybody respond I will respectfully start a new thread on that subject)
The acid test is climbing an overpass in OD locked. Can it maintain speed without unlocking? or downshifting. If u read Bee Jay's old story, i'm optimistic.
He filled in the divider and cured the problem. 2000 rpm is high(easy to fix)
my 270h has good response even at 1000, part throttle, tho i don't have OD. I'm sure you will get a variety of replys. Minimum connection between the 2 planes is the key to sucess.(to reduce cam egr)
Last edited by Matt Gruber; Nov 19, 2012 at 11:18 AM.
Race Director
Joined: Apr 2000
Posts: 17,676
Likes: 201
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
I meant Schumacher but it doesn't really matter , how many times did you Google Capps before you posted to make sure ? He's been in 77 Final rounds, it's crap like this that makes this forum stink, people waiting in weeds until someone makes an error.
Melting Slicks
Joined: Aug 2012
Posts: 3,487
Likes: 83
From: Titusville Florida
I just happened to know is all 
Race Director
Joined: Apr 2000
Posts: 17,676
Likes: 201
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
Matt Gruber has been around a long time, he thinks outside the box. That means he doesn't read a lot of BS Hot Rod rags etc. and does things his way I have the ultimate respect for a person like that. Good to have you back Matt
As far as the four pattern cam is concerned, these people are out to make money, period. This is going to be another intellectual BS concern. Dual pattern is good, four pattern must be better. One blade razor is good so a 5 blade razor must be better. I have not read any thing about this new four pattern cam yet but I can tell you this already it ain't going in any motor I build.
I do know you need two lifts on a cylinder and how that is done is up to the buyer of the cam, I run a dual pattern only because the cam I wanted only came that way. The 270-280H single pattern cams are dynamite the rest of it is trying to make you believe what they have is superior to another cam and will go to no lengths to prove their point.
Last edited by MotorHead; Nov 19, 2012 at 11:59 AM.
Melting Slicks
Joined: Aug 2012
Posts: 3,487
Likes: 83
From: Titusville Florida
It's all good MotorHead, wasn't trying to slam you
I am a big fan of Schumacher Racing, whenever the wife and I go to the races Jack invites us into his pits, we've gone up to the line in the chase car with them too. the wife has made motivational speeches with Jack in the hospitality tents too. Most of the people that work for Schumacher are good people, with the exception of one of the drivers (not Ron), and one of the crew chiefs that no longer works for him anyway...
I am a big fan of Schumacher Racing, whenever the wife and I go to the races Jack invites us into his pits, we've gone up to the line in the chase car with them too. the wife has made motivational speeches with Jack in the hospitality tents too. Most of the people that work for Schumacher are good people, with the exception of one of the drivers (not Ron), and one of the crew chiefs that no longer works for him anyway...
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Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
In my opinion single pattern cams and dual pattern cams both have their place. If your Intake/exhaust ratio is real good and you are running open headers or a big exhaust with very low restriction (like in a race engine) a single pattern cam will outperform a dual pattern in many instances. This also shows up on the dyno but dyno headers are not street exhaust. If you are running stock heads or poor I/E ratio heads and restrictive exhaust you will do better with a split duration cam. Forced induction and nitrous are always split duration with a bigger split. The XE268 has a bigger split than I would recommend with good I/E heads and free flowing exhaust but likely better in a street application with the OP's heads than a single pattern. Off the shelf cams are always a compromise.
Race Director
Joined: Apr 2000
Posts: 17,676
Likes: 201
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
In my opinion single pattern cams and dual pattern cams both have their place. If your Intake/exhaust ratio is real good and you are running open headers or a big exhaust with very low restriction (like in a race engine) a single pattern cam will outperform a dual pattern in many instances. This also shows up on the dyno but dyno headers are not street exhaust. If you are running stock heads or poor I/E ratio heads and restrictive exhaust you will do better with a split duration cam. Forced induction and nitrous are always split duration with a bigger split. The XE268 has a bigger split than I would recommend with good I/E heads and free flowing exhaust but likely better in a street application with the OP's heads than a single pattern. Off the shelf cams are always a compromise.
I have been building engines since the early 70's. Have I built some duds ( you betcha
) but most if not all were cleared up buy changing parts to the correct ones and tuning. I now build 600+HP small blocks that you can get it and not have clue as to how much power is under your right foot, until you try it. I build them so they don't overheat, they start easy and you can toll around town all day in 90deg temp. Then without shutting it off you can go directly to the staging lanes of a dragstrip and beat about anyone that turned up that night
Race Director
Joined: Oct 2000
Posts: 15,057
Likes: 79
From: central FL, near the beach.
Thanks Wayne!(motorhead) I always look forward to reading your posts! You have done lots of cool things to your c3 
.
i think i'll hold off, and wait for the 8 pattern cam
I'll put it in a C8
Edit,
i agree, lot's of IBS out there. Sounds so logical, it has to be true. NOT
I always look forward to reading your posts! You have done lots of cool things to your c3 .
i think i'll hold off, and wait for the 8 pattern cam
I'll put it in a C8
Edit,
i agree, lot's of IBS out there. Sounds so logical, it has to be true. NOT
Last edited by Matt Gruber; Nov 19, 2012 at 02:29 PM.
Safety Car
Joined: Jan 2009
Posts: 3,736
Likes: 56
From: anchorage ak
Le Mans Master
Joined: Apr 2006
Posts: 5,403
Likes: 95
mako
Just google his name and spend a few hours reading his posts. I look for posters that do their own research and testing. Your Q was good enough that i PM'ed him for the first time. I gave his name/post as a source, rather than just giving my conclusion that the 270h is a great cam too. I have the 270h for 18 years in my 61, and i can't think of any way that a cam change can improve that combo. But, as i said before, i thought it was out of date. Since i was wrong about that, i provided my source. Jeff did back to back testing and he is a valuable source of information.
CompCams just released their new 4 pattern cams. Their job is to make money selling us new "state of the art" cams. They have to make them look really different to make the sale. They make logical arguments why the new cams are far superior. Guys like Jeff check them out to see if it is true.
Just google his name and spend a few hours reading his posts. I look for posters that do their own research and testing. Your Q was good enough that i PM'ed him for the first time. I gave his name/post as a source, rather than just giving my conclusion that the 270h is a great cam too. I have the 270h for 18 years in my 61, and i can't think of any way that a cam change can improve that combo. But, as i said before, i thought it was out of date. Since i was wrong about that, i provided my source. Jeff did back to back testing and he is a valuable source of information.
CompCams just released their new 4 pattern cams. Their job is to make money selling us new "state of the art" cams. They have to make them look really different to make the sale. They make logical arguments why the new cams are far superior. Guys like Jeff check them out to see if it is true.
Last edited by Little Mouse; Nov 19, 2012 at 06:14 PM.
Safety Car
Joined: Sep 2012
Posts: 4,688
Likes: 41
From: Palm Harbor, Florida
this is like golf clubs, every year, something better has to come out(supposedly better) to get guys to pull $400-$500 out of their wallet for a new driver
Racer
Joined: Jun 2009
Posts: 393
Likes: 3
All set to order my cam, an XE268H was my final choice. I have Edelbrock E-Street heads, Performer Intake, Hollly 4175 carb, Supercomp Header, 200r4 trans w/2400 stall (stall still to be ordered) and 3.70 rear gear. All on or going on a 76 L82, stock bottom end, new rings and bearings less then 5000 miles ago. Then another forum member suggested I get a XE262H with 1.6 rocker on the intake side only - said it was worth 10HP. Any thoughts before I place my order?
Race Director
Joined: Apr 2000
Posts: 17,676
Likes: 201
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
Thread Starter
Instructor
Joined: Feb 2011
Posts: 205
Likes: 0
From: Laquey Missouri
First instincts usually work for me, so still leaning toward the XE268H, although the 270H still looks good. The only reason that I'm even doing this is that I bought the Edelbrock E-Street heads from another forum member at 1/2 price, and yes, they are brand new. I already have the gear in the rear, the 200R4 is in the garage - just need a cam/lifter, timing chain, and push rods and gaskets and I'm good to go. First set of Alum heads I've ever had and am surprised at the differences of opinion about a cam. I just want something that pulls hard with the capacity of these heads, idles well, no vacuum issues, and I can use my OD trans with - and it must pull my wifes 2011 full size Silverado off the line - she laughs at me everytime she does. oh yeah - and the VOODOO stuff looks good also - sooooo????
Thread Starter
Instructor
Joined: Feb 2011
Posts: 205
Likes: 0
From: Laquey Missouri
I would go with the 60102. I'm not sure my valve springs are up to the voodoo cam - just never looked at it. I can't remember the formula for figuring spring rate but I believe that the E-Streets valve spring rate is 444 and 462 is required for that cam. Don't ask me what that number means, IDK, and I may be way off.
Drifting
Joined: Dec 2004
Posts: 1,714
Likes: 42
From: Austin Texas
Check this out. http://www.speedtalk.com/forum/viewtopic.php?p=175557
udharold is the guy who designed the Voodoo cams for Holley which changed to Lunati. Looks like he is still designing cams but does not work for a major cam company. He puts his phone number in the post, you can call the guy who designed the cams. He may even custom design you one to work with your combo.
My next cam will probably be the 60102 also. But this is interesting.
Here is his complete bio. http://www.hotrodders.com/forum/luna...ts-157971.html
A history of cam designers. http://www.harveycrane.com/founders....mps_And_Grinds
Wow, Harold Brookshire, designed cams for comp and lunati and you can call him. I just love the internet.
udharold is the guy who designed the Voodoo cams for Holley which changed to Lunati. Looks like he is still designing cams but does not work for a major cam company. He puts his phone number in the post, you can call the guy who designed the cams. He may even custom design you one to work with your combo.
My next cam will probably be the 60102 also. But this is interesting.
Here is his complete bio. http://www.hotrodders.com/forum/luna...ts-157971.html
A history of cam designers. http://www.harveycrane.com/founders....mps_And_Grinds
Wow, Harold Brookshire, designed cams for comp and lunati and you can call him. I just love the internet.
Last edited by johnt365; Nov 19, 2012 at 09:29 PM.