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comp vs cam #1086605
10/02/11 07:06 AM 10/02/11 07:06 AM
Joined: Jan 2009
Posts: 1,044
Victoria, Australia
Ian Offline OP
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Ian  Offline OP
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what are your guys theorys on comp vs cam, 408 with big heads flow 350 cfm/230 700 lift with 11.5 comp what cam vs the comp i have seen cams very from 250 to 280 @050

1.37 60 ft [email]6.0@113[/email] [email]9.57@141[/email] 408 glide 3550lbs
new video http://www.youtube.com/watch?feature=player_embedded&v=Xvq3ZObywQE
Re: comp vs cam [Re: Ian] #1086606
10/02/11 02:36 PM 10/02/11 02:36 PM
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junction city oregon
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viperblue72 Offline
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Are you saying what size cam for 11.5 compression? How much rpm do you plan to spin it? Stall speed? Car weight?
Re: comp vs cam [Re: viperblue72] #1086607
10/02/11 04:15 PM 10/02/11 04:15 PM
Joined: Jan 2007
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emarine01 Offline
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Hey Ian It does come down to a point of how high you want to turn , weight & gearing, We droped down from 280@.050 to 260, lost around 1000 rpm but we made up for it with gear & tire & have picked up speed with less ware & tear, remember We mud race so its all about instant wheel speed on shift recovery,

Re: comp vs cam [Re: emarine01] #1086608
10/03/11 12:08 AM 10/03/11 12:08 AM
Joined: Jan 2009
Posts: 1,044
Victoria, Australia
Ian Offline OP
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hi craig got the engine torn down and givin it a freshin up i have that 270/277 roller 700/650 lift or would it go better with a smaller 260/266 cam with the same lift car weight 3550 and 4500 stall and 1.76 glide my max rpm will be 7200 4.1 gears 28 /9 tyres which cam

1.37 60 ft [email]6.0@113[/email] [email]9.57@141[/email] 408 glide 3550lbs
new video http://www.youtube.com/watch?feature=player_embedded&v=Xvq3ZObywQE
Re: comp vs cam [Re: Ian] #1086609
10/03/11 01:42 AM 10/03/11 01:42 AM
Joined: Aug 2003
Posts: 43,223
Bend,OR USA
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Cab_Burge Offline
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I would try the smaller one I have a comp Cams custom ground solid roller cam in my 518 C.I. pum gas motor that is very close to yours. Mine is 260 @ .050 on the intake with .420 lobe lift, 1.65 rockers on both sides and 266 @.050 on the exhaust with .409 lobe lift. The motor pulls real hard to above 7800 RPM according to the VDO Extreme playback tach in the car The last time that motor was on a engine dyno it made peak HP at 7300 and 7400 RPM Good luck

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: comp vs cam [Re: Cab_Burge] #1086610
10/03/11 02:53 AM 10/03/11 02:53 AM
Joined: Jan 2009
Posts: 1,044
Victoria, Australia
Ian Offline OP
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Ian  Offline OP
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Victoria, Australia
Quote:

I would try the smaller one I have a comp Cams custom ground solid roller cam in my 518 C.I. pum gas motor that is very close to yours. Mine is 260 @ .050 on the intake with .420 lobe lift, 1.65 rockers on both sides and 266 @.050 on the exhaust with .409 lobe lift. The motor pulls real hard to above 7800 RPM according to the VDO Extreme playback tach in the car The last time that motor was on a engine dyno it made peak HP at 7300 and 7400 RPM Good luck


thanks mate i have never had a roller before , the cam in it was ft 259/265 109 l/c 600 lift ,all my seats on the indy heads were oval my head man here said they were the worst he has seen lol should have listed to ryan on there valve jobs lol

1.37 60 ft [email]6.0@113[/email] [email]9.57@141[/email] 408 glide 3550lbs
new video http://www.youtube.com/watch?feature=player_embedded&v=Xvq3ZObywQE
Re: comp vs cam [Re: Ian] #1086611
10/03/11 09:27 AM 10/03/11 09:27 AM
Joined: Jan 2007
Posts: 3,695
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emarine01 Offline
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260 vs 270 .... the 11.5 should support either cam, Our 414 W5 doesn't flow as much air as your heads, the 260 duration .680 lift cam we run now makes the best power @ 6600 to 7000 then falls off hard, It maxes out @ 7200 & we shift @ 6800, What was your power band with the old cam?
Re: comp vs cam [Re: emarine01] #1086612
10/03/11 12:37 PM 10/03/11 12:37 PM
Joined: Jan 2009
Posts: 1,044
Victoria, Australia
Ian Offline OP
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went flat 6700 rpm ,comp woz 11.3 i have milled heads and taken 4 cc out of them , i will be flowing them in 2 days see if valve job makes any changes thanks ian

1.37 60 ft [email]6.0@113[/email] [email]9.57@141[/email] 408 glide 3550lbs
new video http://www.youtube.com/watch?feature=player_embedded&v=Xvq3ZObywQE
Re: comp vs cam [Re: Ian] #1086613
10/03/11 04:04 PM 10/03/11 04:04 PM
Joined: Jan 2007
Posts: 3,695
nc
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emarine01 Offline
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Cab may have the right answer for ya, My engine is intake manifold restricted < small port M1 > so I really don't know where the top of the 260 cam should be, We hit the vert hard @ 5500, rips right to 6800, truck noses over @7k and has nothing left @7200
Re: comp vs cam [Re: emarine01] #1086614
10/03/11 10:58 PM 10/03/11 10:58 PM
Joined: Jan 2009
Posts: 1,044
Victoria, Australia
Ian Offline OP
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Ian  Offline OP
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Victoria, Australia
cab ,how big are your heads that cam is pulling well up high above 7 k the heads must increase rpm up top thanks

1.37 60 ft [email]6.0@113[/email] [email]9.57@141[/email] 408 glide 3550lbs
new video http://www.youtube.com/watch?feature=player_embedded&v=Xvq3ZObywQE
Re: comp vs cam [Re: Ian] #1086615
10/04/11 12:53 AM 10/04/11 12:53 AM
Joined: Aug 2003
Posts: 43,223
Bend,OR USA
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Cab_Burge Offline
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Quote:

cab ,how big are your heads that cam is pulling well up high above 7 k the heads must increase rpm up top thanks

I have had several different sets of heads and different intake systems on it, it would not pull good in high gear above 6200 RPM with the CNC ported Eddy RPM and stock type low deck six pak intake and carbs. It pulled real hard in 1st and 2nd to above 7300 RPM but not in high gear I switch the heads and intake to a set of Indy SR heads with the M.W. size intake ports with a Indy 400-3 modified by Bob George Racing and I have used several different 1050 Holley Doniators on it as well as a Indy 400-2 intake abd 850 Holley D.P. It pulls real hard now in 3rd gear with the Indy 400-3 and 1050 carb I shift it between 7200 RPM to 7600 RPM in 1st gear and around 7000 RPM in 2nd egar and it crosses the finish line at or real close to 7000 RPM, depending on where I shift it out of 2nd gear It will cross the finish line in the 1/4 mile at a higher RPM if I short shift 1st or 2nd gear I was pleasently suprised on how much better the motor runs with the bigger heads Big C.I. motors need big heads I guess

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: comp vs cam [Re: Ian] #1086616
10/04/11 12:04 PM 10/04/11 12:04 PM
Joined: Jan 2003
Posts: 16,928
NC
440Jim Offline
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Quote:

hi craig got the engine torn down and givin it a freshin up i have that 270/277 roller 700/650 lift or would it go better with a smaller 260/266 cam with the same lift

I was thinking 266 to let the head flow do the work not more cam. The 11.5 CR really limits the duration I would use. The 260 sounds a little small, but since the lobes are more agressive than the 270 (same lift), I would start with the smaller cam. Better to under cam than over cam, IMO.
Re: comp vs cam [Re: 440Jim] #1086617
10/04/11 01:45 PM 10/04/11 01:45 PM
Joined: Jan 2009
Posts: 1,044
Victoria, Australia
Ian Offline OP
super stock
Ian  Offline OP
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Joined: Jan 2009
Posts: 1,044
Victoria, Australia
Quote:

Quote:

hi craig got the engine torn down and givin it a freshin up i have that 270/277 roller 700/650 lift or would it go better with a smaller 260/266 cam with the same lift

I was thinking 266 to let the head flow do the work not more cam. The 11.5 CR really limits the duration I would use. The 260 sounds a little small, but since the lobes are more agressive than the 270 (same lift), I would start with the smaller cam. Better to under cam than over cam, IMO.

thanks i will try to get comp 11.9 if i can i will give it a final cc after increasing valve releaf and i will give it a sniff of gas at times.

1.37 60 ft [email]6.0@113[/email] [email]9.57@141[/email] 408 glide 3550lbs
new video http://www.youtube.com/watch?feature=player_embedded&v=Xvq3ZObywQE
Re: comp vs cam [Re: Ian] #1086618
10/04/11 01:48 PM 10/04/11 01:48 PM
Joined: Aug 2003
Posts: 43,223
Bend,OR USA
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Cab_Burge Offline
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I forgot to mention that the change of heads also increased the comp. ratio from 10.29 to 1 to 10.82 to 1, not much increase, but some

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: comp vs cam [Re: Cab_Burge] #1086619
10/04/11 03:27 PM 10/04/11 03:27 PM
Joined: Jan 2007
Posts: 3,695
nc
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emarine01 Offline
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Ian, what center are the cams cut on... 108...106? When we swapped to the smaller cam I installed it 106 on 106... with the large cam it was installed +4 107 on 103.
Re: comp vs cam [Re: emarine01] #1086620
10/05/11 12:19 AM 10/05/11 12:19 AM
Joined: Jan 2009
Posts: 1,044
Victoria, Australia
Ian Offline OP
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Ian  Offline OP
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Joined: Jan 2009
Posts: 1,044
Victoria, Australia
thanks guys, the cam is 108 l/c and run it at 102-4 should pull harder on conveter and better mid range with more cld pressure,i may be wrong

1.37 60 ft [email]6.0@113[/email] [email]9.57@141[/email] 408 glide 3550lbs
new video http://www.youtube.com/watch?feature=player_embedded&v=Xvq3ZObywQE

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