Opinions on the Comp XR282 cam?
11-13-2003, 10:01 PM
#1
Supreme Member
Thread Starter
Join Date: Nov 2000
Location: Newark, DE
Posts: 1,760
Likes: 0
Received 0 Likes
on
0 Posts
Car: 86' Z28
Engine: 355
Transmission: T-56
Opinions on the Comp XR282 cam?
I'm currently running the comp cams Xe274 cam (flat tappet), and i'm considering swapping to roller this winter. I'm eying up the XR 282 right now. It's specs seem to be pretty close to the xe274, only its roller.
How does the XR 282 compare to the xe274? Any problems with power brakes? choppy idle? What all do i need to convert from flat tappet to roller? I know i'll be needing new springs (any thoughts on which?)
I run trick flow heads with a performer rpm intake and a demon 750 carb, its got a t-56 and 3.89 gears backing it up. Only bottleneck i can still see right now is the edelcrap headers...
give me your thoughts opinions and experiences on this cam.
Eric
http://members.***.net/impunity/endofworld.swf
How does the XR 282 compare to the xe274? Any problems with power brakes? choppy idle? What all do i need to convert from flat tappet to roller? I know i'll be needing new springs (any thoughts on which?)
I run trick flow heads with a performer rpm intake and a demon 750 carb, its got a t-56 and 3.89 gears backing it up. Only bottleneck i can still see right now is the edelcrap headers...
give me your thoughts opinions and experiences on this cam.
Eric
http://members.***.net/impunity/endofworld.swf
Last edited by zupmanZ28; 11-13-2003 at 10:06 PM.
11-13-2003, 10:07 PM
#2
Senior Member
iTrader: (2)
Join Date: Jan 2002
Location: Kingsport, TN
Posts: 925
Likes: 0
Received 0 Likes
on
0 Posts
Car: '92 RS, '84 Z28
Engine: 383, L69
Transmission: T56, 700R4
Axle/Gears: 3.42, 3.42
I would go with comps recomended springs, and the cam look up badgta, he has the next step up 288hr. Hope this helps a little.
Kevin
Kevin
11-14-2003, 09:47 AM
#3
Supreme Member
Join Date: Jul 1999
Location: Loveland, OH, US
Posts: 18,457
Likes: 0
Received 14 Likes
on
14 Posts
Car: 4
Engine: 6
Transmission: 5
I made that exact cam swap in my 400 once. Went from the XE274 to the XR282.
The XR282 is a whole lot more cam. The specs don't really tell the whole story; the valves open much faster, so they're much farther open for the entire time that they're open.
It definitely lowered the vacuum and resulted in a rougher idle.
I had no problems with vacuum, or power brakes; but that was in a 400. Might be a bit different in a 350.
Use Comp 986 springs, and the retainers and all to go with them.
The XR282 is a whole lot more cam. The specs don't really tell the whole story; the valves open much faster, so they're much farther open for the entire time that they're open.
It definitely lowered the vacuum and resulted in a rougher idle.
I had no problems with vacuum, or power brakes; but that was in a 400. Might be a bit different in a 350.
Use Comp 986 springs, and the retainers and all to go with them.
11-14-2003, 10:09 AM
#4
Supreme Member
Join Date: Jul 2003
Location: Lima, OH
Posts: 1,096
Likes: 0
Received 0 Likes
on
0 Posts
Car: '89 Formula 350 & '86 Z28
Engine: L98 & 355ci
Transmission: 700r4 in both
edit: what I wanted to say was posted already, my bad.
About it being a more drastic change for him bc of his 350 vs 400
About it being a more drastic change for him bc of his 350 vs 400
11-14-2003, 10:12 AM
#5
Supreme Member
Join Date: Mar 2002
Location: Lower Salford, PA
Posts: 1,654
Likes: 0
Received 2 Likes
on
2 Posts
Car: 1987 Camaro Z-28
Engine: 6.3L Victor EFI
Transmission: Tremec TKO 600
Axle/Gears: Moser 9"/4.11 Trac-Lok
Originally posted by RB83L69
Use Comp 986 springs, and the retainers and all to go with them.
Use Comp 986 springs, and the retainers and all to go with them.
11-14-2003, 10:26 AM
#6
Supreme Member
Join Date: Apr 2003
Location: B'ville, WV
Posts: 1,781
Likes: 0
Received 0 Likes
on
0 Posts
Car: 2002 Formula Firebird
Engine: LS1
Transmission: 4l60e
Axle/Gears: 3.23
How you this the xr282 will act in a street 350? I am also thinking about getting that cam. May be a bit to much cam for the 170cc etecs..
11-15-2003, 03:25 PM
#7
Supreme Member
Thread Starter
Join Date: Nov 2000
Location: Newark, DE
Posts: 1,760
Likes: 0
Received 0 Likes
on
0 Posts
Car: 86' Z28
Engine: 355
Transmission: T-56
what lifters are you running? I was looking in summit, and it looks like a have a few options...between vertical bars, and horizontal bars with spings. which ones are better?
I was planning on spinning this thing to around 6200rpm, so i guess i'll be going with the 987's.
RB:, you don't by chance remember how much this whole swap ended up costing you with all the nickel and dime stuff do ya?
Eric
EDIT: i'm kinda lookin for a drastic change, so i'm thinking this should work well. The xe274 has a tame idle by my standards, and as long as the power brakes are still gonna work, then it sounds like i'm in business. I"m also thinking about porting the heads while it's off. Never done it before, so i'm gonna be taling to trick flow, and other people who've ported heads to see what i need to do to these things to get some flow... (feel free to give your thoughts on that as well)
I was planning on spinning this thing to around 6200rpm, so i guess i'll be going with the 987's.
RB:, you don't by chance remember how much this whole swap ended up costing you with all the nickel and dime stuff do ya?
Eric
EDIT: i'm kinda lookin for a drastic change, so i'm thinking this should work well. The xe274 has a tame idle by my standards, and as long as the power brakes are still gonna work, then it sounds like i'm in business. I"m also thinking about porting the heads while it's off. Never done it before, so i'm gonna be taling to trick flow, and other people who've ported heads to see what i need to do to these things to get some flow... (feel free to give your thoughts on that as well)
Last edited by zupmanZ28; 11-15-2003 at 03:30 PM.
Trending Topics
11-15-2003, 04:51 PM
#8
Supreme Member
Join Date: Jul 1999
Location: Loveland, OH, US
Posts: 18,457
Likes: 0
Received 14 Likes
on
14 Posts
Car: 4
Engine: 6
Transmission: 5
Can't really say how much that one cost; I didn't pay for most of it, and it was part of a larger project besides.
I did, however, buy all the roller stuff to go in another engine fairly recently, as part of a complete rebuild; it ran about $575-600 IIRC, as opposed to the usual $200 or so for a complete flat tappet setup.
The vertical bar kind are fine for the street. The horizontal bar kind with the lift springs is for people who might need to do a quick cam swap, and aren't running a rev kit, and want to avoid spending the extra time disturbing the intake.
I did, however, buy all the roller stuff to go in another engine fairly recently, as part of a complete rebuild; it ran about $575-600 IIRC, as opposed to the usual $200 or so for a complete flat tappet setup.
The vertical bar kind are fine for the street. The horizontal bar kind with the lift springs is for people who might need to do a quick cam swap, and aren't running a rev kit, and want to avoid spending the extra time disturbing the intake.
11-16-2003, 02:59 AM
#10
Supreme Member
iTrader: (5)
Join Date: Jan 2001
Location: Evansville,IN,USA
Posts: 2,025
Likes: 0
Received 1 Like
on
1 Post
Car: 89' T/A, 00' Firehawk
Engine: 406 Roller
Transmission: TH700R4 w/2800 stall
Axle/Gears: 3.23 Posi
I have that cam in my 406 and my friend has it in his pontiac 455. Its a neat cam, the power band is really good, it sounds like a prostreet car at idle. Vacuum is about 10 inchs and thats it. Definatly do with the better spring, rollers need it.
11-16-2003, 05:15 PM
#11
Supreme Member
Thread Starter
Join Date: Nov 2000
Location: Newark, DE
Posts: 1,760
Likes: 0
Received 0 Likes
on
0 Posts
Car: 86' Z28
Engine: 355
Transmission: T-56
ok, i'm adding this all up right now...and i'm up to 630 bucks, not including lifters!??
Parts list so far:
Cam..................$240
Springs..............$85.........(pn 987)
Locks.................$26.........(pn 613)
Retainers..........$134.95...(pn 730)
Seals.................$25..........(pn 503)
Fuel pump rod...$14
Pushrods...........$102.69...(pn 7609)
this doesn't include the 300 or so dollars the lifters are gonna cost. Does this sound right, or am i missing a loop hole? This is gonna cost almost $1000 by the time i'm done with it.
Eric
Parts list so far:
Cam..................$240
Springs..............$85.........(pn 987)
Locks.................$26.........(pn 613)
Retainers..........$134.95...(pn 730)
Seals.................$25..........(pn 503)
Fuel pump rod...$14
Pushrods...........$102.69...(pn 7609)
this doesn't include the 300 or so dollars the lifters are gonna cost. Does this sound right, or am i missing a loop hole? This is gonna cost almost $1000 by the time i'm done with it.
Eric
11-16-2003, 05:45 PM
#12
Supreme Member
iTrader: (5)
Join Date: Jan 2001
Location: Evansville,IN,USA
Posts: 2,025
Likes: 0
Received 1 Like
on
1 Post
Car: 89' T/A, 00' Firehawk
Engine: 406 Roller
Transmission: TH700R4 w/2800 stall
Axle/Gears: 3.23 Posi
heck, i just realized I have the 288xtreme roller cam
The 282 would be good in a 350 with a good set of heads.
Yes it is expensive. The lifters are the worst part. For the pushrods, use trck flow 's instead of comp cams, trick flows are 85 bucks thats what I went with, actually, i have a set of 7.3in pushrods for sale, I never sent them back to summit so if you need them let me know. What reatiners are you using, that sounds awful high. Comp cams is really proud of there stuff, shop around to see if you can find better prices.
The 282 would be good in a 350 with a good set of heads. Yes it is expensive. The lifters are the worst part. For the pushrods, use trck flow 's instead of comp cams, trick flows are 85 bucks thats what I went with, actually, i have a set of 7.3in pushrods for sale, I never sent them back to summit so if you need them let me know. What reatiners are you using, that sounds awful high. Comp cams is really proud of there stuff, shop around to see if you can find better prices.
11-16-2003, 05:48 PM
#13
Supreme Member
Thread Starter
Join Date: Nov 2000
Location: Newark, DE
Posts: 1,760
Likes: 0
Received 0 Likes
on
0 Posts
Car: 86' Z28
Engine: 355
Transmission: T-56
the retainers are the titanium ones...i was under the assumption that i needed them to use the 987 springs..what retainers are you using?
Eric
Eric
11-16-2003, 07:04 PM
#14
Supreme Member
Join Date: Jul 2003
Location: Lima, OH
Posts: 1,096
Likes: 0
Received 0 Likes
on
0 Posts
Car: '89 Formula 350 & '86 Z28
Engine: L98 & 355ci
Transmission: 700r4 in both
goto summitracing.com and search this part # CCA-K12-432-8
For $875 you get all thats pictured.
I bought a k-kit for my mechanical roller, its nice to get it all at once, matched. Anytime you are retrofitting to a roller cam assume it will cost $1000, and youll be safe.
For $875 you get all thats pictured.
I bought a k-kit for my mechanical roller, its nice to get it all at once, matched. Anytime you are retrofitting to a roller cam assume it will cost $1000, and youll be safe.
Last edited by SweetS10v8; 11-16-2003 at 07:07 PM.
11-16-2003, 07:40 PM
#15
Supreme Member
Thread Starter
Join Date: Nov 2000
Location: Newark, DE
Posts: 1,760
Likes: 0
Received 0 Likes
on
0 Posts
Car: 86' Z28
Engine: 355
Transmission: T-56
i looked at it, but it didn't really give any info on what comes with the kit...looking at that pic, those lifters won't work, meaning i still have to spend the 300 dollars on lifters...
Eric
Eric
11-16-2003, 08:28 PM
#16
Supreme Member
Join Date: Jul 2003
Location: Lima, OH
Posts: 1,096
Likes: 0
Received 0 Likes
on
0 Posts
Car: '89 Formula 350 & '86 Z28
Engine: L98 & 355ci
Transmission: 700r4 in both
It comes with the lifters, it comes with everything even the timing chain....everything!(-pushrods)
that is not the "exact kit" you see in the pic. Everything you get is the correct part #'s for the cam you order. The picture is just a representation, lol
that is not the "exact kit" you see in the pic. Everything you get is the correct part #'s for the cam you order. The picture is just a representation, lol
11-16-2003, 08:36 PM
#18
Supreme Member
Thread Starter
Join Date: Nov 2000
Location: Newark, DE
Posts: 1,760
Likes: 0
Received 0 Likes
on
0 Posts
Car: 86' Z28
Engine: 355
Transmission: T-56
i understand thats not the actual picture, all i'm saying is that i see no specification as to whether that kit comes with regular roller lifters or retro rollers...nor does it say which springs it comes with
Eric
Eric
11-17-2003, 01:15 PM
#20
Supreme Member
Thread Starter
Join Date: Nov 2000
Location: Newark, DE
Posts: 1,760
Likes: 0
Received 0 Likes
on
0 Posts
Car: 86' Z28
Engine: 355
Transmission: T-56
Only problem i see with that, is the kit comes with the 986 springs, which as mentioned above have trouble with high rpms, which i where this thing is gonna live. i need the 987 springs....wonder if comp makes a kit with the 987's instead of the 986's...
Eric
Eric
11-17-2003, 01:20 PM
#21
Supreme Member
Join Date: Jul 1999
Location: Loveland, OH, US
Posts: 18,457
Likes: 0
Received 14 Likes
on
14 Posts
Car: 4
Engine: 6
Transmission: 5
Mine ran fine with 986s.
Of course, I was running fairly lightweight valves, and careful and correct spring setup. Other situations might be different.
From my days of doing contract engineering work for Comp when I lived in Memphis, I can't feature that they would package a kit that simply doesn't work. They have dyno cells (2 of them) where they run engines with their products installed, to verify that they work according to spec.
Incidentally, the 986s have higher seat pressure at nominal installed height than 987s do; which would tend to control valve float better where it most often ocurs, namely at the seat (valves bounce off the seat). "Valve toss", or float at max lift, is much less common.
Of course, I was running fairly lightweight valves, and careful and correct spring setup. Other situations might be different.
From my days of doing contract engineering work for Comp when I lived in Memphis, I can't feature that they would package a kit that simply doesn't work. They have dyno cells (2 of them) where they run engines with their products installed, to verify that they work according to spec.
Incidentally, the 986s have higher seat pressure at nominal installed height than 987s do; which would tend to control valve float better where it most often ocurs, namely at the seat (valves bounce off the seat). "Valve toss", or float at max lift, is much less common.
01-28-2004, 10:28 PM
#22
Member
Join Date: Jan 2002
Location: Spartanburg, SC
Posts: 121
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1986 Camaro
Engine: 357
Transmission: 700-R4
I don't know if you have ordered your parts yet but they are alot cheaper at racenet.net
you have to use the search for the part #
they sell the cam kit with lifters and cam and timing chain for $555 its cheaper than the cam and lifter kit
then order everything else seperately
you have to use the search for the part #
they sell the cam kit with lifters and cam and timing chain for $555 its cheaper than the cam and lifter kit
then order everything else seperately
01-29-2004, 10:02 AM
#23
Junior Member
Join Date: Jan 2003
Location: Florida
Posts: 78
Likes: 0
Received 0 Likes
on
0 Posts
Car: 89 IROC
Engine: 350 Carbed
Transmission: WC T5
zupman,
I have the cam that your thinking about buying in my 350 with all the goodies, heads,airgap,750DP, etc.etc. No valve float, heads beyond 6200rpms with no issue's,I keep it around 64000 at shift points, nice IDLE, vacuum is a non issue.
I'm thinking about going with a mech. roller set up pretty soon and will sell you this came for a good price, it has maybe 2,000 street miles on it.. I have the cam card somewhere, and I'll find it for you.
wclifford@synergon.net ... if your interested..
BC
I have the cam that your thinking about buying in my 350 with all the goodies, heads,airgap,750DP, etc.etc. No valve float, heads beyond 6200rpms with no issue's,I keep it around 64000 at shift points, nice IDLE, vacuum is a non issue.
I'm thinking about going with a mech. roller set up pretty soon and will sell you this came for a good price, it has maybe 2,000 street miles on it.. I have the cam card somewhere, and I'll find it for you.
wclifford@synergon.net ... if your interested..
BC
01-29-2004, 04:29 PM
#25
Supreme Member
iTrader: (-1)
Join Date: Mar 2002
Location: SE Michigan
Posts: 1,728
Likes: 0
Received 2 Likes
on
2 Posts
Car: Bright Red 91 GTA
Engine: CARBED LT4
Transmission: MK6
IIRC you can use 3.1 roller liftes froma corsica baretta cutlass,..etc. instead of the retros...thatll save ya $250 if im correct
01-29-2004, 04:51 PM
#26
Supreme Member
iTrader: (-1)
Join Date: Mar 2002
Location: SE Michigan
Posts: 1,728
Likes: 0
Received 2 Likes
on
2 Posts
Car: Bright Red 91 GTA
Engine: CARBED LT4
Transmission: MK6
heres a link to the info..
https://www.thirdgen.org/techbb2/sho...+roller+lifter
heres another
https://www.thirdgen.org/techbb2/sho...+roller+lifter
https://www.thirdgen.org/techbb2/sho...+roller+lifter
heres another
https://www.thirdgen.org/techbb2/sho...+roller+lifter
Thread
Thread Starter
Forum
Replies
Last Post
