Cam change? Change my mind....
Thread Starter
On The Tree
Joined: Jan 2012
Posts: 101
Likes: 10
Cam change? Change my mind.... I am very happy with my combo and any normal person would leave it alone. Well, I'm stupid and can't leave well enough alone. I am considering a cam change to alter the sound of the combo. Sounds stupid right.
Current combo:
1990 RS
This combo put down 515 at the wheels (dyno was with 10 bolt and 3.42's) on a mustang dyno. Power is smooth and everywhere but doesn't sound very rowdy at idle as the cam has only 1.5 deg overlap. I am considering the comp 54-549-11 cam 231/239 @ 113 .617/.624. It adds a few degrees and yields 9 degrees of overlap. This cam would shift my powerband a little north but probably not by much. I don't want to lose too much power down low and it certainly must idle in traffic with the AC on. The recent addition of the 4.10's also helps offset any low end loss.
I am really only considering this because I may have to go with another clutch as I somehow managed to damage my RPS unit. Its being evaluated but if I have to change units, I will be adding weight and will likely need a new dyno tune anyways.
Talk me out of this.
Current combo:
1990 RS
- 11.5 CR 377LS3
- Mamo 235 Cathedral Ports
- Comp 227/232 114+3 .614/.610
- Mamo ported FAST 102
- NW 102 TB
- Mamo 10mm Yella Terra Rockers with Manton pushrods
- Johnson Tie Bar with axle oiling lifters
- Tremec Magnum with Mamo RPS BC2 Clutch
- Trick Chassis ford 9" with 4.10 gears
- True Dual 3" exhaust with cats
This combo put down 515 at the wheels (dyno was with 10 bolt and 3.42's) on a mustang dyno. Power is smooth and everywhere but doesn't sound very rowdy at idle as the cam has only 1.5 deg overlap. I am considering the comp 54-549-11 cam 231/239 @ 113 .617/.624. It adds a few degrees and yields 9 degrees of overlap. This cam would shift my powerband a little north but probably not by much. I don't want to lose too much power down low and it certainly must idle in traffic with the AC on. The recent addition of the 4.10's also helps offset any low end loss.
I am really only considering this because I may have to go with another clutch as I somehow managed to damage my RPS unit. Its being evaluated but if I have to change units, I will be adding weight and will likely need a new dyno tune anyways.
Talk me out of this.
I am very happy with my combo and any normal person would leave it alone. Well, I'm stupid and can't leave well enough alone. I am considering a cam change to alter the sound of the combo. Sounds stupid right.
Current combo:
1990 RS
This combo put down 515 at the wheels (dyno was with 10 bolt and 3.42's) on a mustang dyno. Power is smooth and everywhere but doesn't sound very rowdy at idle as the cam has only 1.5 deg overlap. I am considering the comp 54-549-11 cam 231/239 @ 113 .617/.624. It adds a few degrees and yields 9 degrees of overlap. This cam would shift my powerband a little north but probably not by much. I don't want to lose too much power down low and it certainly must idle in traffic with the AC on. The recent addition of the 4.10's also helps offset any low end loss.
I am really only considering this because I may have to go with another clutch as I somehow managed to damage my RPS unit. Its being evaluated but if I have to change units, I will be adding weight and will likely need a new dyno tune anyways.
Talk me out of this.
Current combo:
1990 RS
- 11.5 CR 377LS3
- Mamo 235 Cathedral Ports
- Comp 227/232 114+3 .614/.610
- Mamo ported FAST 102
- NW 102 TB
- Mamo 10mm Yella Terra Rockers with Manton pushrods
- Johnson Tie Bar with axle oiling lifters
- Tremec Magnum with Mamo RPS BC2 Clutch
- Trick Chassis ford 9" with 4.10 gears
- True Dual 3" exhaust with cats
This combo put down 515 at the wheels (dyno was with 10 bolt and 3.42's) on a mustang dyno. Power is smooth and everywhere but doesn't sound very rowdy at idle as the cam has only 1.5 deg overlap. I am considering the comp 54-549-11 cam 231/239 @ 113 .617/.624. It adds a few degrees and yields 9 degrees of overlap. This cam would shift my powerband a little north but probably not by much. I don't want to lose too much power down low and it certainly must idle in traffic with the AC on. The recent addition of the 4.10's also helps offset any low end loss.
I am really only considering this because I may have to go with another clutch as I somehow managed to damage my RPS unit. Its being evaluated but if I have to change units, I will be adding weight and will likely need a new dyno tune anyways.
Talk me out of this.
TECH Fanatic
Joined: Jul 2007
Posts: 1,802
Likes: 333
From: Wilmington, De
You can easily alter the sound of this at idle with the tune. You can lower the idle speed and activate the idle spark adaptives, among other things. I know enough about tuning to be dangerous…reach out to your tuner and ask questions….save yourself a bunch of money, time, and headache.
Thread Starter
On The Tree
Joined: Jan 2012
Posts: 101
Likes: 10
I will. He spec'd my current cam. I will likely decide after I find out the fate of my clutch. I did think of the tune part of it, but not sure I want to go that way. I'll keep pondering.
TECH Resident
Joined: Jun 2011
Posts: 937
Likes: 472
If you're looking more for sound, the LSR version will give you a little more and keep the powerband similar. It's a 227/243 113+4. 9 degrees overlap. 42.5* IVC vs. 43.5*. Still pull a little higher in rpm.
https://www.compcams.com/lsr-rectang...ii-iv-cpg.html
https://www.compcams.com/lsr-rectang...ii-iv-cpg.html
Thread Starter
On The Tree
Joined: Jan 2012
Posts: 101
Likes: 10
If you're looking more for sound, the LSR version will give you a little more and keep the powerband similar. It's a 227/243 113+4. 9 degrees overlap. 42.5* IVC vs. 43.5*. Still pull a little higher in rpm.
https://www.compcams.com/lsr-rectang...ii-iv-cpg.html
https://www.compcams.com/lsr-rectang...ii-iv-cpg.html
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Verdad Gallardo TECH Resident
Joined: Jun 2011
Posts: 937
Likes: 472
Here's an example where RH tested the "cathedral" versus it's "rectangular" port on a cathedral port head. (He also compares both on a rec port head). Similar curve, more aggressive idle. Start at the 2 min mark.
The Mamp stuff typical prefers smaller splits, his exh port works very well. Don't take any of the advice here for cam recommendations, I would call him and re-spec for bigger combo. That being said a, Scoggin Dickey 232-236 113 cam will make very good power in that combo and it's cheap. Just depends on what you want. Honestly, since you have roller rockers, put some serious springs in it and crank up the lift. .680-720. It's power that's already there, just cam it right and start the party💪
Thread Starter
On The Tree
Joined: Jan 2012
Posts: 101
Likes: 10
