Re: Honestly, cam selection toughest part
[Re: Diplomat360]
#2743795
02/16/20 11:23 PM
02/16/20 11:23 PM
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Joined: Apr 2008
Posts: 117 Aus
hysteric
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Joined: Apr 2008
Posts: 117
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I would recommend something less than 230 dur @0.050". Here is why: 1) you want good vacum for PB 2) you want a bit of a lumpy idle, but not overdo it I used to run this Crower Compu-Pro 282HDP in a SB 360 motor. With 3.55 gearing and 9.5:1 CR it was a blast, loved the street manners, no complaints. The car still pulled pretty good vacum, I think about 12-14" if I remember (it was a good 20 yrs ago). I stepped up to a Hughes Engines HE3844AL (238/244 @0.050" on 108LSA) on my last build. That cam really needed a 4k converter in a heavy car like mine. It is pretty rumpy alright, but only pulls 7" of vacum, the throttle response suffers. Now, the car overall combo is very different than when the Crower was in. I am running a 4.10 gear now for one and 10.5:1 CR. So while I throughly enjoy my current setup, given what you stated as your goals and focus I would recommend you watch the duration @0.050". I have that 282 HDP sitting on the shelf. I have the smaller 271 HDP in a similar combo 360 that ran a 12.8 @ 105.5 mph. Did you ever run that combo at the track? The 271 would be too small in a 440 with what the OP was looking for in my view. Hysteric
Last edited by hysteric; 02/16/20 11:24 PM.
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Re: Honestly, cam selection toughest part
[Re: hysteric]
#2743804
02/17/20 12:17 AM
02/17/20 12:17 AM
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Joined: Dec 2009
Posts: 21,055 in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 21,055
in a cattle trailer down by th...
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I decided to go with the Comp Cams nostalgia plus for my 360. 239/243 I think at .050 on a 108 LSA. Maybe a little more radical than I need right now but the truck is a stick with 4.10 gears. Should the vacuum become a problem there is always electric vacuum pumps but eventually I'll convert it to a hydroboost. Don't want to lose the brakes coming down a mountain. So if you really want a cam with the lopey idle characteristics there are ways to do it but you will need a looser converter.
"Come get your wife"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Front and rear disc and hydroboost conversion. 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Honestly, cam selection toughest part
[Re: hysteric]
#2744079
02/17/20 09:38 PM
02/17/20 09:38 PM
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Joined: Jan 2003
Posts: 1,793 Windsor, ON, Canada
Diplomat360
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,793
Windsor, ON, Canada
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I have that 282 HDP sitting on the shelf. I have the smaller 271 HDP in a similar combo 360 that ran a 12.8 @ 105.5 mph. Did you ever run that combo at the track?
The 271 would be too small in a 440 with what the OP was looking for in my view....
Nope...never had it to the track in that combo...but with the HE3844AL it's an embarrasing 13.13 @105...I suspect traction issues as the car is not setup at all to do drag racing (no weight xfer, all stiff suspension, sway bars, very little front-end uplift on launch). Put it this way, the stroker 408 W2 I am building right now is getting a 112LSA cam, hydraulic roller that's just a step hotter 240/244 @0.050. My Crower was a 112 LSA, and in this ride it was an extremely fitting setup...so I'm jumping the 108 LSA for a 112 LSA hoping to come off the line a little flatter and not so peaky as the current 108 LSA is.
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Re: Honestly, cam selection toughest part
[Re: Diplomat360]
#2744082
02/17/20 09:49 PM
02/17/20 09:49 PM
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Joined: Aug 2003
Posts: 43,721 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,721
Bend,OR USA
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Last edited by Cab_Burge; 02/17/20 09:49 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Honestly, cam selection toughest part
[Re: Cab_Burge]
#2744133
02/18/20 12:42 AM
02/18/20 12:42 AM
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Joined: Apr 2008
Posts: 117 Aus
hysteric
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Joined: Apr 2008
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Why the narrow LSA on stock type heads? I thought the logic was wider LSA's on stock type heads to increase the top end because of the limited airflow. Hysteric
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Re: Honestly, cam selection toughest part
[Re: Cab_Burge]
#2744149
02/18/20 04:21 AM
02/18/20 04:21 AM
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Joined: Apr 2008
Posts: 117 Aus
hysteric
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Joined: Apr 2008
Posts: 117
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The reason I say to use a tight LSA on stock type heads is from helping several SB NHRA stock record holders and doing cam dyno testing on several of those type motors, the 105 LSA cams made more HP and torque with the exact same lobes than the cam with 107 LSA did shruggy We tested both cams from 2 degrees retarded in 2 degree increments advancing them up to 6 degrees advanced wrench Both cams like the ILC around 4 degrees advanced up Any cam ground on a wider LSA with those same legal lobes wouldn't fall out of a tree with a elephant tugging on it with a rope work grin AKA those stock heads stop flowing decently a little under .500 lift and that is what NHRA limits the lift to ( a little less actually) What were the cam specs duration wise and what rpm are we talking here?
Last edited by hysteric; 02/18/20 04:22 AM.
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Re: Honestly, cam selection toughest part
[Re: hysteric]
#2744178
02/18/20 09:30 AM
02/18/20 09:30 AM
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Joined: Dec 2009
Posts: 21,055 in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 21,055
in a cattle trailer down by th...
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The reason I say to use a tight LSA on stock type heads is from helping several SB NHRA stock record holders and doing cam dyno testing on several of those type motors, the 105 LSA cams made more HP and torque with the exact same lobes than the cam with 107 LSA did shruggy We tested both cams from 2 degrees retarded in 2 degree increments advancing them up to 6 degrees advanced wrench Both cams like the ILC around 4 degrees advanced up Any cam ground on a wider LSA with those same legal lobes wouldn't fall out of a tree with a elephant tugging on it with a rope work grin AKA those stock heads stop flowing decently a little under .500 lift and that is what NHRA limits the lift to ( a little less actually) What were the cam specs duration wise and what rpm are we talking here? Stocker cams are limited to .430 lift but any duration is allowed and they typically have a LOT of duration.
"Come get your wife"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Front and rear disc and hydroboost conversion. 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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