Summit ls turbo cams?
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Joined: Jan 2008
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Yes im nagging and calling you out RH push the damn thing.
or r u skerd. Looking at 2 of these cams the 8706 and 8716. When do you recommend the 8716 over the 8706? I'm wondering if the 8716 might spool a turbo a little quicker if you have a larger turbine with the change in EVO.
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take a look at his videos. he has pushed a 4.8 and 6.0 to MAX. (big bang motors) haha.
Anyone using the stage 4 turbo cam or have a link to any tests, comparisons, etc?
Broke a valve spring and it snowballed from there. Lifter hammered the cam lobe, rocker bolt loosened up, rocker mushroomed the valve tip and with the exhaust valve only partially opening, it lifted the head.
Since I have to replace the BTR stage 4, and since I'm pinching pennies, I was wondering how the Summit stage 4 compared and what difference I might see with a 402ci. My own damn fault as I have been hammering on this poor engine and other than the occasional leak-down, haven't even taken off the valve covers in 3+ yrs. Man, you would think an LS could handle more abuse than that
Broke a valve spring and it snowballed from there. Lifter hammered the cam lobe, rocker bolt loosened up, rocker mushroomed the valve tip and with the exhaust valve only partially opening, it lifted the head.
Since I have to replace the BTR stage 4, and since I'm pinching pennies, I was wondering how the Summit stage 4 compared and what difference I might see with a 402ci. My own damn fault as I have been hammering on this poor engine and other than the occasional leak-down, haven't even taken off the valve covers in 3+ yrs. Man, you would think an LS could handle more abuse than that
Anyone using the stage 4 turbo cam or have a link to any tests, comparisons, etc?
Broke a valve spring and it snowballed from there. Lifter hammered the cam lobe, rocker bolt loosened up, rocker mushroomed the valve tip and with the exhaust valve only partially opening, it lifted the head.
Since I have to replace the BTR stage 4, and since I'm pinching pennies, I was wondering how the Summit stage 4 compared and what difference I might see with a 402ci. My own damn fault as I have been hammering on this poor engine and other than the occasional leak-down, haven't even taken off the valve covers in 3+ yrs. Man, you would think an LS could handle more abuse than that
Broke a valve spring and it snowballed from there. Lifter hammered the cam lobe, rocker bolt loosened up, rocker mushroomed the valve tip and with the exhaust valve only partially opening, it lifted the head.
Since I have to replace the BTR stage 4, and since I'm pinching pennies, I was wondering how the Summit stage 4 compared and what difference I might see with a 402ci. My own damn fault as I have been hammering on this poor engine and other than the occasional leak-down, haven't even taken off the valve covers in 3+ yrs. Man, you would think an LS could handle more abuse than that
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From: Ohio, Georgia, Nevada, Texas
Anyone using the stage 4 turbo cam or have a link to any tests, comparisons, etc?
Broke a valve spring and it snowballed from there. Lifter hammered the cam lobe, rocker bolt loosened up, rocker mushroomed the valve tip and with the exhaust valve only partially opening, it lifted the head.
Since I have to replace the BTR stage 4, and since I'm pinching pennies, I was wondering how the Summit stage 4 compared and what difference I might see with a 402ci. My own damn fault as I have been hammering on this poor engine and other than the occasional leak-down, haven't even taken off the valve covers in 3+ yrs. Man, you would think an LS could handle more abuse than that
Broke a valve spring and it snowballed from there. Lifter hammered the cam lobe, rocker bolt loosened up, rocker mushroomed the valve tip and with the exhaust valve only partially opening, it lifted the head.
Since I have to replace the BTR stage 4, and since I'm pinching pennies, I was wondering how the Summit stage 4 compared and what difference I might see with a 402ci. My own damn fault as I have been hammering on this poor engine and other than the occasional leak-down, haven't even taken off the valve covers in 3+ yrs. Man, you would think an LS could handle more abuse than that
Our stage 4 also has 4.5* less overlap at 2*. Not that a stage 4 cam is typically something where we're looking for good driveability, but ours would be better here in that aspect.
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From: Ohio, Georgia, Nevada, Texas
In general, they would work well in a twin-turbo application. More info about your combo and goals would be helpful to provide a recommendation. With a 4.8, there’s a chance our Stage 2 truck cam SUM-8720 would a good candidate. Specs on it are .600/.600, 218/227, 112 + 2. There's a humorous but descriptive review on this cam in a turbo 4.8 application. Check out "the sauce" review on our site.
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Slow Sedan and Summit, thanks for the replies.
It is a Summit gen IV 6.0L bare block with a Manley 402 rotating assembly, 18cc dish (#28402R), ARP main and head studs. Stock 5364 heads (9.5:1 c.r.), upgraded springs, upgraded rockers, Lunati short-travel link-bar lifters, China Sniper intake, 102mm TB, 210lb Bosch (pump E85), flipped truck manifolds, 2.5" x-over, Billet S485/102mm turbine, 5" into 4" DP/fender exit, 5" A2A, PTC 10" converter, TH400, 3.08:1, 275DRs.
Car is '92 Fox notch weighing 3300# w/driver. It is primarily a drag car but driven not towed with the occasional gearhead gatherings. Can't say there's anything wrong with the BTR stage 4 as I've never tried anything else. It fires right up, idles fine and drivability is as expected. However, since I have to replace it, if there is something better or equivalent but less expensive, it's certainly a consideration. One thing I have never understood is when looking at cam selections, you see cams specific for LS3 N/A, LS3 supercharged but not LS3 turbo. Does turbocharging negate the difference of LS3-headed engines?
It is a Summit gen IV 6.0L bare block with a Manley 402 rotating assembly, 18cc dish (#28402R), ARP main and head studs. Stock 5364 heads (9.5:1 c.r.), upgraded springs, upgraded rockers, Lunati short-travel link-bar lifters, China Sniper intake, 102mm TB, 210lb Bosch (pump E85), flipped truck manifolds, 2.5" x-over, Billet S485/102mm turbine, 5" into 4" DP/fender exit, 5" A2A, PTC 10" converter, TH400, 3.08:1, 275DRs.
Car is '92 Fox notch weighing 3300# w/driver. It is primarily a drag car but driven not towed with the occasional gearhead gatherings. Can't say there's anything wrong with the BTR stage 4 as I've never tried anything else. It fires right up, idles fine and drivability is as expected. However, since I have to replace it, if there is something better or equivalent but less expensive, it's certainly a consideration. One thing I have never understood is when looking at cam selections, you see cams specific for LS3 N/A, LS3 supercharged but not LS3 turbo. Does turbocharging negate the difference of LS3-headed engines?
Slow Sedan and Summit, thanks for the replies.
It is a Summit gen IV 6.0L bare block with a Manley 402 rotating assembly, 18cc dish (#28402R), ARP main and head studs. Stock 5364 heads (9.5:1 c.r.), upgraded springs, upgraded rockers, Lunati short-travel link-bar lifters, China Sniper intake, 102mm TB, 210lb Bosch (pump E85), flipped truck manifolds, 2.5" x-over, Billet S485/102mm turbine, 5" into 4" DP/fender exit, 5" A2A, PTC 10" converter, TH400, 3.08:1, 275DRs.
Car is '92 Fox notch weighing 3300# w/driver. It is primarily a drag car but driven not towed with the occasional gearhead gatherings. Can't say there's anything wrong with the BTR stage 4 as I've never tried anything else. It fires right up, idles fine and drivability is as expected. However, since I have to replace it, if there is something better or equivalent but less expensive, it's certainly a consideration. One thing I have never understood is when looking at cam selections, you see cams specific for LS3 N/A, LS3 supercharged but not LS3 turbo. Does turbocharging negate the difference of LS3-headed engines?
It is a Summit gen IV 6.0L bare block with a Manley 402 rotating assembly, 18cc dish (#28402R), ARP main and head studs. Stock 5364 heads (9.5:1 c.r.), upgraded springs, upgraded rockers, Lunati short-travel link-bar lifters, China Sniper intake, 102mm TB, 210lb Bosch (pump E85), flipped truck manifolds, 2.5" x-over, Billet S485/102mm turbine, 5" into 4" DP/fender exit, 5" A2A, PTC 10" converter, TH400, 3.08:1, 275DRs.
Car is '92 Fox notch weighing 3300# w/driver. It is primarily a drag car but driven not towed with the occasional gearhead gatherings. Can't say there's anything wrong with the BTR stage 4 as I've never tried anything else. It fires right up, idles fine and drivability is as expected. However, since I have to replace it, if there is something better or equivalent but less expensive, it's certainly a consideration. One thing I have never understood is when looking at cam selections, you see cams specific for LS3 N/A, LS3 supercharged but not LS3 turbo. Does turbocharging negate the difference of LS3-headed engines?
Launching!
Joined: May 2012
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In general, they would work well in a twin-turbo application. More info about your combo and goals would be helpful to provide a recommendation. With a 4.8, there’s a chance our Stage 2 truck cam SUM-8720 would a good candidate. Specs on it are .600/.600, 218/227, 112 + 2. There's a humorous but descriptive review on this cam in a turbo 4.8 application. Check out "the sauce" review on our site.
so at 4300# with the SUM-8720 cam w/ TFS-16918 style beehive springs what stall converter for max effort with bw366 turbos?
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We do a lot of work with Richard, but a lot of damage can occur if the cam has too much overlap and the turbo has a lot of restriction at the turbine. You’ll see that our intake valve events are the same on our N/A and turbo cams but we close the exhaust in direct relation of intake opening to limit overlap
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From: Ohio, Georgia, Nevada, Texas
Slow Sedan and Summit, thanks for the replies.
It is a Summit gen IV 6.0L bare block with a Manley 402 rotating assembly, 18cc dish (#28402R), ARP main and head studs. Stock 5364 heads (9.5:1 c.r.), upgraded springs, upgraded rockers, Lunati short-travel link-bar lifters, China Sniper intake, 102mm TB, 210lb Bosch (pump E85), flipped truck manifolds, 2.5" x-over, Billet S485/102mm turbine, 5" into 4" DP/fender exit, 5" A2A, PTC 10" converter, TH400, 3.08:1, 275DRs.
Car is '92 Fox notch weighing 3300# w/driver. It is primarily a drag car but driven not towed with the occasional gearhead gatherings. Can't say there's anything wrong with the BTR stage 4 as I've never tried anything else. It fires right up, idles fine and drivability is as expected. However, since I have to replace it, if there is something better or equivalent but less expensive, it's certainly a consideration. One thing I have never understood is when looking at cam selections, you see cams specific for LS3 N/A, LS3 supercharged but not LS3 turbo. Does turbocharging negate the difference of LS3-headed engines?
It is a Summit gen IV 6.0L bare block with a Manley 402 rotating assembly, 18cc dish (#28402R), ARP main and head studs. Stock 5364 heads (9.5:1 c.r.), upgraded springs, upgraded rockers, Lunati short-travel link-bar lifters, China Sniper intake, 102mm TB, 210lb Bosch (pump E85), flipped truck manifolds, 2.5" x-over, Billet S485/102mm turbine, 5" into 4" DP/fender exit, 5" A2A, PTC 10" converter, TH400, 3.08:1, 275DRs.
Car is '92 Fox notch weighing 3300# w/driver. It is primarily a drag car but driven not towed with the occasional gearhead gatherings. Can't say there's anything wrong with the BTR stage 4 as I've never tried anything else. It fires right up, idles fine and drivability is as expected. However, since I have to replace it, if there is something better or equivalent but less expensive, it's certainly a consideration. One thing I have never understood is when looking at cam selections, you see cams specific for LS3 N/A, LS3 supercharged but not LS3 turbo. Does turbocharging negate the difference of LS3-headed engines?
Your car is well thought out. We think our stage 3 turbo cam will be as quick or quicker with that 308 gear and that short runner intake.
We do a lot of work with Richard, but a lot of damage can occur if the cam has too much overlap and the turbo has a lot of restriction at the turbine. You’ll see that our intake valve events are the same on our N/A and turbo cams but we close the exhaust in direct relation of intake opening to limit overlap
well I mentioned to him the overlap, how fast it spools and the fact that we don’t race Dyno’s. Performance on the Dyno doesn’t tell the tale on the street or track.
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Joined: Jan 2008
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From: Ohio, Georgia, Nevada, Texas
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Joined: Jan 2008
Posts: 2,234
Likes: 1,524
From: Ohio, Georgia, Nevada, Texas
No problem. With .600/.575 lift and the lobe's noses being .010 under the 55mm cam journal, the base circle radius is .719 Int. and.734 Exh. and diameter becomes 1.438I/1.468E