Comps XFI Grinds
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TECH Apprentice
Joined: Dec 2008
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From: Kinston North Carolina
Comps XFI Grinds Im just curious as to why its rare to see people running these grinds up here. Seems like they are capable of great torque with their aggressive lobes. The only thing i can see thats holding them back on some HP is the 113 LSA. But then you gotta ask yourself do i want great drivability, or ***** to the wall power. Seems like they would make great streetable power. Whats your opinion?
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Joined: Mar 2009
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From: Lilburn
Just a response I have a 1994 Camaro with a built 383 stroker motor! I have the comp XFI grind in mine! I love it cause of the great torque and power but it KILLS all gas mileage! I am getting like 10 mpg! But other than that i love the XFI grind
Yeah doesn't seem like a whole ton of people run the XFI grinds. If I had to guess why I would say it's some combination of:
1.) The XFI cams are fairly new and not nearly as proven as some older grinds which may steer some away.
2.) XFI grinds take more of a beating on valve train components than other grinds on say Xtreme Energy or Magnum lobes which may steer some people away.
3.) The overly wide LSA's certainly don't help them in my book.
Buddy of mine has the XFI 218/224 with beehives and he's been running that setup for a couple years now and he seems to like it alot.
1.) The XFI cams are fairly new and not nearly as proven as some older grinds which may steer some away.
2.) XFI grinds take more of a beating on valve train components than other grinds on say Xtreme Energy or Magnum lobes which may steer some people away.
3.) The overly wide LSA's certainly don't help them in my book.
Buddy of mine has the XFI 218/224 with beehives and he's been running that setup for a couple years now and he seems to like it alot.
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XFI grind is "newer" design over Magnum lobe profiles. XFI lobes are designed for FI applications, not Carb motors. You will need "bee hive" springs for them.
I have the 218/224 in my 383. VERY streetable and passes smog with no issue (most likely due to the 113 LSA). makes great TQ.
I have the 218/224 in my 383. VERY streetable and passes smog with no issue (most likely due to the 113 LSA). makes great TQ.
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Joined: Dec 2008
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From: Kinston North Carolina
Im planning to put a 355 together and havent decided to custom grind a cam or go with the 218/224 XFI piece. I like the looks of it, though it will leave some power on the table. Im looking for a good balance between good streetability and power. I can probably go with a smaller lift because i fixed my heads to flow killer at low lifts and they only go from 277 to 283CFM between .500 and .600 lift, so they are a little flat on the top from the smaller intake runner. I still think that taking the EXH lobe from the cam above and the INT lobe from its big brother, which would make 224/230 duration and .565/.576. lift on 112 LSA would make an awesome cam. Im also running 8mm stemed valves so with the lighter valves that shouldnt be to agressive of a cam.
Im planning to put a 355 together and havent decided to custom grind a cam or go with the 218/224 XFI piece. I like the looks of it, though it will leave some power on the table. Im looking for a good balance between good streetability and power. I can probably go with a smaller lift because i fixed my heads to flow killer at low lifts and they only go from 277 to 283CFM between .500 and .600 lift, so they are a little flat on the top from the smaller intake runner. I still think that taking the EXH lobe from the cam above and the INT lobe from its big brother, which would make 224/230 duration and .565/.576. lift on 112 LSA would make an awesome cam. Im also running 8mm stemed valves so with the lighter valves that shouldnt be to agressive of a cam.
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From: Kinston North Carolina
I would go custom way before I would go with that XFI 466 IMO. For example this is my custom grind...224/230 .570's on 107lsa using XFI lobes. The LSA is too wide with the off-the-shelf XFI stuff and for about the same money cannot beat a custom grind. To get a good balance of streetability and power your going to want something similar to my cam I would contact Lloyd Elliott or Ai.
Last edited by wht97ws6ta; Aug 30, 2009 at 02:36 PM.
Yea i definitly agree with you on the tighter LSA will make more power. But i and more concerned with effieciency and drivability and a flatter torque curve than i am about making a big HP number. This isnt exactly my daily driver but still gets driven 200 miles a week or so. Im the kinda guy thats more impressed to see a smooth running well mannered motor go out there and rip the track up and take it with it when it leaves and doing so in a quite matter. I think what im going to wind up doing is build a mild motor and put a fogger system on it so it will be well mannered and lethal when i need it to be.
Nitrous would be nice, nothing like a car that drives 100% stock and packs a punch when you want it to. That's what has me wanting to go the forced induction route with my next car.
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Joined: Dec 2008
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From: Kinston North Carolina
If you dont mind me askin what lobes did you use. I got the same exhaust and gears as you. Right now im having issues with the tranny shifting with my 4.10s. Are you running stock heads? And what kind of quarter miles does it run?
Which means using more spring than Comp recommends since their rpm ranges are MUCH lower than reality.
Set up an XFI cam per Comp's recommendations in a 350/355 and you WILL have valve train longevity issues. A stroker will bring the rpm range down nearer Comp's incorrect listed ranges so it wont be as pronounced there.
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Had a 280xfi now I have custom. The xfi has wider LSA than optimal and was harder on the valvetrain than my custom cam.(trust me it was) My custom cam has aproximately the same duration, more lift and 3 or 4 degrees less LSA than the 280XFI it replaced.
My custom cam is much better to drive.
MIKE
My custom cam is much better to drive.
MIKE
Thread Starter
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Joined: Dec 2008
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From: Kinston North Carolina
Had a 280xfi now I have custom. The xfi has wider LSA than optimal and was harder on the valvetrain than my custom cam.(trust me it was) My custom cam has aproximately the same duration, more lift and 3 or 4 degrees less LSA than the 280XFI it replaced.
My custom cam is much better to drive.
MIKE
My custom cam is much better to drive.
MIKE
