Wrong Cam?
Wrong Cam? Current setup is an ls6 with 243 ported heads, msd intake with 102tb, 1 7/8 long tubes, rotofab CAI, current cam is a comp 231/247 with .617 lift on the intake side and .623 on exhaust on a 115 LSA. Doing a little research it appears this was a cam designed to work with rectangle ported ls3 heads? Car makes good power, 455rw and 415tq, but it winds all the way to 7000 rpm and on the engine dyno peak tq was at like 6k rpm.
is there any power left on the table with another cam? is there something else that could make as much power but not rev so high? Anyway to bring the tq down in the rpm range?
is there any power left on the table with another cam? is there something else that could make as much power but not rev so high? Anyway to bring the tq down in the rpm range?
TECH Enthusiast
Joined: Feb 2018
Posts: 645
Likes: 300
From: Michigan
I doubt there is much to be gained with a different cam. If it's already in the car I probably wouldn't change it.
But if you do, go with something like a Cam Motion Titan 5, or maybe a BTR Stage 3 LS1/LS2 cam
But if you do, go with something like a Cam Motion Titan 5, or maybe a BTR Stage 3 LS1/LS2 cam
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probably wont make any more peak power but definitely could make more power under the curve with a different cam, youll want something with a little less exhaust duration and tighter lsa 112-113ish, intake duration and lift spec is fine
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Good advice from several members. I don't know why so many people think a tighter LSA kills lower rev power. A tighter LSA will boost the lower mid-range and mid-range torque substantially, all else equal. Tighter LSA's also usually doesn't kill power rapidly when you rev past the power peak. The fall-off is more gradual......
Tightening the LSA up will increase the overlap. More overlap means less efficiency down around idle and tip in. More overlap can make tuning a bit more difficult and some idle/low speed issues may not be totally resolved. Generally speaking, the best all-around way to get more power under the curve and not give up any drivability is to simply put a smaller cam in it. Cam motion Titan 4 would be a solid choice. Once you get to Titan 5 territory, the cam will want 7500 rpm to make "Best" use of its power band, even though it would likely still have better mid-range than your current cam. Just look at the converter recommendation on Cam motions page between the 4 & 5. The 4 calls for up to a 4k stall, the 5 calls for up to 4500. Imo anything that wants a 4500 stall is going to want to be spun to 7500 rpm if the rest of the combination will support it.
On The Tree
Joined: Apr 2024
Posts: 129
Likes: 22
Everyone is focusing on the cam , but who ported the heads ? What are the valve sizes ?
a smaller cam will change the power curve for sure, but if the heads are running 2.1” /1.6” valves you might be optimized for that cam and higher RPM.
lot of people like the rec port heads because they shift the power band higher in the TPM and the cathedral make better power under the curve (till you start porting them)
another question I’d be asking is what the compression is. Upping the compression will make more power ever where and largish cams like the one you are running like higher compression.
got a Dyno curve ?
a smaller cam will change the power curve for sure, but if the heads are running 2.1” /1.6” valves you might be optimized for that cam and higher RPM.
lot of people like the rec port heads because they shift the power band higher in the TPM and the cathedral make better power under the curve (till you start porting them)
another question I’d be asking is what the compression is. Upping the compression will make more power ever where and largish cams like the one you are running like higher compression.
got a Dyno curve ?
Everyone is focusing on the cam , but who ported the heads ? What are the valve sizes ?
a smaller cam will change the power curve for sure, but if the heads are running 2.1” /1.6” valves you might be optimized for that cam and higher RPM.
lot of people like the rec port heads because they shift the power band higher in the TPM and the cathedral make better power under the curve (till you start porting them)
another question I’d be asking is what the compression is. Upping the compression will make more power ever where and largish cams like the one you are running like higher compression.
got a Dyno curve ?
a smaller cam will change the power curve for sure, but if the heads are running 2.1” /1.6” valves you might be optimized for that cam and higher RPM.
lot of people like the rec port heads because they shift the power band higher in the TPM and the cathedral make better power under the curve (till you start porting them)
another question I’d be asking is what the compression is. Upping the compression will make more power ever where and largish cams like the one you are running like higher compression.
got a Dyno curve ?
Tightening the LSA up will increase the overlap. More overlap means less efficiency down around idle and tip in. More overlap can make tuning a bit more difficult and some idle/low speed issues may not be totally resolved. Generally speaking, the best all-around way to get more power under the curve and not give up any drivability is to simply put a smaller cam in it. Cam motion Titan 4 would be a solid choice. Once you get to Titan 5 territory, the cam will want 7500 rpm to make "Best" use of its power band, even though it would likely still have better mid-range than your current cam. Just look at the converter recommendation on Cam motions page between the 4 & 5. The 4 calls for up to a 4k stall, the 5 calls for up to 4500. Imo anything that wants a 4500 stall is going to want to be spun to 7500 rpm if the rest of the combination will support it.
On The Tree
Joined: Apr 2024
Posts: 129
Likes: 22
- if it were me, I’d be coming in those receipts looking for all the data. I also contact that company and ask them what purpose the motor was built for. Sounds to me like it was built to spin.
Any idea if the cam was installed "straight" up or advanced any?
Also, what is it going in, what are you using the vehicle for and what is the rest of the combo?
Weight?
Trans?
Rear gear?
It amazes me that people will throw out advice, and not even ask the BASIC questions that any cam manufacturer or engine builder would ask.
A dyno graph would also be helpful.
Also, what is it going in, what are you using the vehicle for and what is the rest of the combo?
Weight?
Trans?
Rear gear?
It amazes me that people will throw out advice, and not even ask the BASIC questions that any cam manufacturer or engine builder would ask.
A dyno graph would also be helpful.
Any idea if the cam was installed "straight" up or advanced any?
Also, what is it going in, what are you using the vehicle for and what is the rest of the combo?
Weight?
Trans?
Rear gear?
It amazes me that people will throw out advice, and not even ask the BASIC questions that any cam manufacturer or engine builder would ask.
A dyno graph would also be helpful.
Also, what is it going in, what are you using the vehicle for and what is the rest of the combo?
Weight?
Trans?
Rear gear?
It amazes me that people will throw out advice, and not even ask the BASIC questions that any cam manufacturer or engine builder would ask.
A dyno graph would also be helpful.