Short runner manifold vs long runner manifolds
05-09-2015, 11:13 AM
#1
Melting Slicks
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St. Jude Donor '10-'12-'13-'14-'15-'16-'17
Short runner manifold vs long runner manifolds
Trying to keep this short and to the point (pun intended): I understand that short runner manifolds will produce maximum torque later in the rpm band than long runner manifolds. The question is how much later? Is there a calculation to estimate where that point is relative to the long runner manifolds?
I am not looking for a mega rwhp/rwtq monster but rather a capable street driven street friendly ‘vette but with sufficient power (415 to 435 at the wheels NA). I am also looking for something “different” and a little exotic under the hood. I have the opportunity to obtain an Ozmo short runner single throttle body (90mm flange) manifold at a substantial discount below original price (pic attached). I am not running a supercharger or turbo, but I am running a 150HP jetted Nitrous plate (for when that 415 at the wheels needs a little help). Aside from fitment (it will require a cowl hood, which I already have and possibly some clearance cut in the cowl but that is unclear at this point) I am curious how much low end torque I would lose versus the ported LS6 manifold and ported 78mm throttle body I have installed now.
Other supporting mods currently on the car that may affect the calculation include; XS-Power LT’s, Hi flo cats.Ti exhaust, TSP 224R cam @114 with .581 lift, RHS pro Action 205 cc heads 2.02Int/1.6exh valves upgraded springs/rockers/trunions/lifters etc., LS3 timing chain, Melling HV oil pump, and a Black Wing CAI.
This is on a 2000 Coupe 6spd with a stock bottom end and the 3:42 differential but upgraded to C6 Z06 internals and shafts, LG Carbon Fiber drive shaft and the LS7 clutch and fly wheel with Tick adjustable master. Thanks for any information and experience you can pass on.
Not in a C5 but gives you an idea of size and runner length
I am not looking for a mega rwhp/rwtq monster but rather a capable street driven street friendly ‘vette but with sufficient power (415 to 435 at the wheels NA). I am also looking for something “different” and a little exotic under the hood. I have the opportunity to obtain an Ozmo short runner single throttle body (90mm flange) manifold at a substantial discount below original price (pic attached). I am not running a supercharger or turbo, but I am running a 150HP jetted Nitrous plate (for when that 415 at the wheels needs a little help). Aside from fitment (it will require a cowl hood, which I already have and possibly some clearance cut in the cowl but that is unclear at this point) I am curious how much low end torque I would lose versus the ported LS6 manifold and ported 78mm throttle body I have installed now.
Other supporting mods currently on the car that may affect the calculation include; XS-Power LT’s, Hi flo cats.Ti exhaust, TSP 224R cam @114 with .581 lift, RHS pro Action 205 cc heads 2.02Int/1.6exh valves upgraded springs/rockers/trunions/lifters etc., LS3 timing chain, Melling HV oil pump, and a Black Wing CAI.
This is on a 2000 Coupe 6spd with a stock bottom end and the 3:42 differential but upgraded to C6 Z06 internals and shafts, LG Carbon Fiber drive shaft and the LS7 clutch and fly wheel with Tick adjustable master. Thanks for any information and experience you can pass on.
Not in a C5 but gives you an idea of size and runner length
Last edited by alxltd1; 05-10-2015 at 08:36 AM. Reason: added additional pics
05-09-2015, 10:20 PM
#3
Melting Slicks
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St. Jude Donor '15
Wow 4000.00 retail. Definitely unique. Most likely the trade off in low end torque loss (under 3000 rpms) will be made up in the upper rpm horsepower gain. When i swapped from a ls6 designed intake to the edelbrock victor jr on my 408 motor, i really didnt feel any torque loss. Did notice a huge gain in upper rpms. Hp peaked after 7200 rpms.
05-10-2015, 08:29 AM
#4
Melting Slicks
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St. Jude Donor '10-'12-'13-'14-'15-'16-'17
Wow 4000.00 retail. Definitely unique. Most likely the trade off in low end torque loss (under 3000 rpms) will be made up in the upper rpm horsepower gain. When i swapped from a ls6 designed intake to the edelbrock victor jr on my 408 motor, i really didnt feel any torque loss. Did notice a huge gain in upper rpms. Hp peaked after 7200 rpms.
05-10-2015, 11:18 AM
#6
Racer
Trying to keep this short and to the point (pun intended): I understand that short runner manifolds will produce maximum torque later in the rpm band than long runner manifolds. The question is how much later? Is there a calculation to estimate where that point is relative to the long runner manifolds?
I am not looking for a mega rwhp/rwtq monster but rather a capable street driven street friendly ‘vette but with sufficient power (415 to 435 at the wheels NA). I am also looking for something “different” and a little exotic under the hood. I have the opportunity to obtain an Ozmo short runner single throttle body (90mm flange) manifold at a substantial discount below original price (pic attached). I am not running a supercharger or turbo, but I am running a 150HP jetted Nitrous plate (for when that 415 at the wheels needs a little help). Aside from fitment (it will require a cowl hood, which I already have and possibly some clearance cut in the cowl but that is unclear at this point) I am curious how much low end torque I would lose versus the ported LS6 manifold and ported 78mm throttle body I have installed now.
Other supporting mods currently on the car that may affect the calculation include; XS-Power LT’s, Hi flo cats.Ti exhaust, TSP 224R cam @114 with .581 lift, RHS pro Action 205 cc heads 2.02Int/1.6exh valves upgraded springs/rockers/trunions/lifters etc., LS3 timing chain, Melling HV oil pump, and a Black Wing CAI.
This is on a 2000 Coupe 6spd with a stock bottom end and the 3:42 differential but upgraded to C6 Z06 internals and shafts, LG Carbon Fiber drive shaft and the LS7 clutch and fly wheel with Tick adjustable master. Thanks for any information and experience you can pass on.
Not in a C5 but gives you an idea of size and runner length
I am not looking for a mega rwhp/rwtq monster but rather a capable street driven street friendly ‘vette but with sufficient power (415 to 435 at the wheels NA). I am also looking for something “different” and a little exotic under the hood. I have the opportunity to obtain an Ozmo short runner single throttle body (90mm flange) manifold at a substantial discount below original price (pic attached). I am not running a supercharger or turbo, but I am running a 150HP jetted Nitrous plate (for when that 415 at the wheels needs a little help). Aside from fitment (it will require a cowl hood, which I already have and possibly some clearance cut in the cowl but that is unclear at this point) I am curious how much low end torque I would lose versus the ported LS6 manifold and ported 78mm throttle body I have installed now.
Other supporting mods currently on the car that may affect the calculation include; XS-Power LT’s, Hi flo cats.Ti exhaust, TSP 224R cam @114 with .581 lift, RHS pro Action 205 cc heads 2.02Int/1.6exh valves upgraded springs/rockers/trunions/lifters etc., LS3 timing chain, Melling HV oil pump, and a Black Wing CAI.
This is on a 2000 Coupe 6spd with a stock bottom end and the 3:42 differential but upgraded to C6 Z06 internals and shafts, LG Carbon Fiber drive shaft and the LS7 clutch and fly wheel with Tick adjustable master. Thanks for any information and experience you can pass on.
Not in a C5 but gives you an idea of size and runner length
RCI Performance Intake, Carbon Fiber Hydro-Dipped.
RCI Performance Intake, Carbon Fiber Hydro-Dipped.
RCI Performance Intake, Carbon Fiber Hydro-Dipped. Coil Covers from Holley, also Carbon Fiber Hydro-Dipped.
RCI Performance Intake, Carbon Fiber Hydro-Dipped. Air Bridge (not shown) was also Carbon Fiber Hydro-Dipped.
RCI Performance Intake, Carbon Fiber Hydro-Dipped.
05-10-2015, 11:36 AM
#7
Melting Slicks
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St. Jude Donor '10-'12-'13-'14-'15-'16-'17
[QUOTE=davisce;1589600928]First of all let me say that's one nice looking intake, WOW ! I've done a little "INTAKE SWAPING" on my 1999 C5 and this is what I've come up with. It's a "RCI Performance custom design/made Intake (http://www.rciperformance.com/Default.asp) for Corvettes.
That is a very nice looking intake as well. Are you running any forced induction or strictly naturally aspirated? Did it fit without any clearance issues with the cowl/wiper pan?
Also I have the same coil covers from Holley that will be dipped as well. They look great on your engine.
That is a very nice looking intake as well. Are you running any forced induction or strictly naturally aspirated? Did it fit without any clearance issues with the cowl/wiper pan?
Also I have the same coil covers from Holley that will be dipped as well. They look great on your engine.
Last edited by alxltd1; 05-10-2015 at 11:39 AM.
05-10-2015, 01:30 PM
#8
I understand that short runner manifolds will produce maximum torque later in the rpm band than long runner manifolds. The question is how much later? Is there a calculation to estimate where that point is relative to the long runner manifolds?
Other supporting mods currently on the car that may affect the calculation include; TSP 224R cam @114 with .581 lift, RHS pro Action 205 cc heads 2.02Int/1.6exh valves
Other supporting mods currently on the car that may affect the calculation include; TSP 224R cam @114 with .581 lift, RHS pro Action 205 cc heads 2.02Int/1.6exh valves
In other words, if you were making comparison to a stock cam and heads, the answer might be in doubt (would I experience a loss of lower-end torque?). But with the new cam and heads, there should be little or no change, and possibly improvement due to better flow match. At higher rpm's, of course, the new manifold should prove noticeably superior.
Hell, it looks so damn trick that I'd never even have to start the car! :-)
05-10-2015, 04:15 PM
#9
Race Director
Even at half price it's not worth the performance gain. Jmo, as I'm not into engine cosmetics that're only good for car shows. Both the fake CF manifolds are cool, but I'd bet a ported FAST setup would produce more power. I don't like the coil covers at all. Nice aftermarket valve covers, with relocated coil packs look much better.
05-10-2015, 10:12 PM
#10
Le Mans Master
Even at half price it's not worth the performance gain. Jmo, as I'm not into engine cosmetics that're only good for car shows. Both the fake CF manifolds are cool, but I'd bet a ported FAST setup would produce more power. I don't like the coil covers at all. Nice aftermarket valve covers, with relocated coil packs look much better.
05-11-2015, 12:21 PM
#12
Melting Slicks
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St. Jude Donor '10-'12-'13-'14-'15-'16-'17
