ST170 fuel consumption
Discussion
Jon GT2 said:
Ford's version of it, vvt. Current versions are vct if my memory serves.
The only equivalent VTEC technology I am aware of is MIVEC, VVTL-i and maybe VANOS?Edited by Jon GT2 on Monday 26th November 10:32
Edited by Jon GT2 on Monday 26th November 10:33
Fords vvt as you say is variable valve/cam timing and does not have an extra cam lobe that switches over. Which is totally different concept to VTEC's.
VTEC does not have vvt
i-VTEC does have vvt
Thanks for that must admit i never gave it much thought after it was mentioned to me by a Ford engineer.The fact remains the car is very poor on fuel high up in the rev range.
Quote.
Variable Camshaft Timing (VCT) is an automobile variable valve timing technology developed by Ford. It utilizes electronically controlled hydraulic valves that direct engine oil into the camshaft phaser cavity. These oil control solenoids are bolted into the cylinder heads towards the front of the engine near the camshaft phasers. The powertrain control module (PCM) transmits a signal to the solenoids to move a valve spool that regulates the flow of oil to the phaser cavity. The phaser cavity changes the valve timing by either advancing or retarding the camshafts to allow for optimum engine performance, reduced emissions, and increased fuel efficiency.
Quote.
Most simple VVT systems (like Mazda's S-VT) advance or retard the timing of the intake or exhaust valves. Others (like Honda's VTEC) switch between two sets of cam lobes at a certain engine RPM. Still others (like BMW's Valvetronic) can alter timing and lift continuously, which is called Continuous variable valve timing or CVVT.
Quote.
VVT Implementations
Aftermarket Modifications - Conventional hydraulic tappet can be engineered to rapidly bleed-down for variable reduction of valve opening and duration.
Alfa Romeo Twin Spark - TS stands for "Twinspark" engine, it is equipped with Variable Valve Timing technology.
BMW Valvetronic - Provides continuously variable lift for the intake valves; used in conjunction with Double VANOS.
BMW VANOS - Varies intake timing by rotating the camshaft in relation to the gear.
BMW Double VANOS - Continuously varies the timing of the intake and exhaust valves.
Ford Variable Cam Timing - Varies valve timing by rotating the camshaft.
DaimlerChrysler - Varies valve timing thought the use of concentric camshafts developed by Mechadyne enabling dual-independent inlet/exhaust valve adjustment on the 2008 Dodge Viper.
GM VVT - Varies valve timing continuously throughout the RPM range for both intake and exhaust for improved performance in both overhead valve and overhead cam engine applications.(See also Northstar System).
GM DCVCP (Double Continuous Variable Cam Phasing) - Varies timing with hydraulic vane type phaser (see also Ecotec LE5).
Holden Alloytec - Continuously variable camshaft phasing for inlet cams. Continuously variable camshaft phasing for inlet cams and exhaust cams (High Output Alloytec).
Honda VTEC - Varies duration, timing and lift by switching between two different sets of cam lobes.
Honda i-VTEC - In high-output DOHC 4 cylinder engines the i-VTEC system adds continuous intake cam phasing (timing) to traditional VTEC. In economy oriented SOHC and DOHC 4 cylinder engines the i-VTEC system increases engine efficiency by delaying the closure of the intake valves under certain conditions and by using an electronically controlled throttle valve to reduce pumping loss. In SOHC V6 engines the i-VTEC system is used to provide Variable Cylinder Management which deactivates one bank of 3 cylinders during low demand operation.
Honda VTEC-E - Unlike most VTEC systems VTEC-E is not a cam switching system, instead it uses the VTEC mechanism to allow for a lean intake charge to be used by closing one intake valve under certain conditions.
Hyundai MPI CVVT - Varies power, torque, exhaust system, and engine response.
Kawasaki - Varies position of cam by changing oil pressure thereby advancing and retarding the valve timing, 2008 Concours 14.
Lexus VVT-iE - Continuously varies the intake camshaft timing using an electric actuator.
Mazda S-VT - Varies timing by rotating the camshaft.
Mitsubishi MIVEC - Varies valve timing, duration and lift by switching between two different sets of cam lobes. The 4B1 engine series uses a different variant of MIVEC which varies timing (phase) of both intake and exhaust camshafts continuously.
Nissan N-VCT - Varies the rotation of the cam(s) only, does not alter lift or duration of the valves.
Nissan VVL - Varies timing, duration, and lift of the intake and exhaust valves by using two different sets of cam lobes.
Nissan VVT introduced with the HR15DE, HR16DE, MR18DE and MR20DE new engines in September 2004 on the Nissan Tiida and north american version named Nissan Versa (in 2007); and finally the Nissan Sentra (in 2007).
Nissan VVEL introduced with the VQ37VHR Nissan VQ engine engine in 2007 on the Infiniti G37.
Porsche VarioCam - Varies intake timing by adjusting tension of a cam chain.
Porsche VarioCam Plus - Varies intake valve timing by rotating the cam in relation to the cam sprocket as well as duration, timing and lift of the intake and exhaust valves by switching between two different sets of cam lobes.
Proton Campro CPS - Still under development, said to be based on Lotus technology which developed Porsche's VarioCam.
PSA Peugeot Citroën CVVT - Continuous variable valve timing.
Renault Clio 182, Clio Cup and Clio V6 Mk2 VVT - variable valve timing.
Rover VVC - Varies timing with an eccentric disc.
Suzuki - VVT - Suzuki M engine
Subaru AVCS - Varies timing (phase) with hydraulic pressure, used on turbocharged and six-cylinder Subaru engines.
Subaru AVLS - Varies duration, timing and lift by switching between two different sets of cam lobes (similar to Honda VTEC). Used by non-turbocharged Subaru engines.
Toyota VVT - Toyota 4A-GE 20-Valve engine introduced VVT in the 1992 Corolla GT-versions.
Toyota VVT-i - Continuously varies the timing of the intake camshaft, or both the intake and exhaust camshafts (depending on application).
Toyota VVTL-i - Continuously varies the timing of the intake valves. Varies duration, timing and lift of the intake and exhaust valves by switching between two different sets of cam lobes.
Volkswagen - VVT introduced with the 1.8T engine. The intake timing intentionally runs advanced and a retard point is calculated by the ECU. A hydraulic tensioner retards the intake timing.
Volvo - VVT
Yamaha - VCT (Variable Cam Timing) Varies position of cam thereby advancing and retarding the valve timing.
Proton - VVT introduced in the Waja 1.8's F4P renault engine (toyota supplies the VVT to renault)
Quote.
Variable Camshaft Timing (VCT) is an automobile variable valve timing technology developed by Ford. It utilizes electronically controlled hydraulic valves that direct engine oil into the camshaft phaser cavity. These oil control solenoids are bolted into the cylinder heads towards the front of the engine near the camshaft phasers. The powertrain control module (PCM) transmits a signal to the solenoids to move a valve spool that regulates the flow of oil to the phaser cavity. The phaser cavity changes the valve timing by either advancing or retarding the camshafts to allow for optimum engine performance, reduced emissions, and increased fuel efficiency.
Quote.
Most simple VVT systems (like Mazda's S-VT) advance or retard the timing of the intake or exhaust valves. Others (like Honda's VTEC) switch between two sets of cam lobes at a certain engine RPM. Still others (like BMW's Valvetronic) can alter timing and lift continuously, which is called Continuous variable valve timing or CVVT.
Quote.
VVT Implementations
Aftermarket Modifications - Conventional hydraulic tappet can be engineered to rapidly bleed-down for variable reduction of valve opening and duration.
Alfa Romeo Twin Spark - TS stands for "Twinspark" engine, it is equipped with Variable Valve Timing technology.
BMW Valvetronic - Provides continuously variable lift for the intake valves; used in conjunction with Double VANOS.
BMW VANOS - Varies intake timing by rotating the camshaft in relation to the gear.
BMW Double VANOS - Continuously varies the timing of the intake and exhaust valves.
Ford Variable Cam Timing - Varies valve timing by rotating the camshaft.
DaimlerChrysler - Varies valve timing thought the use of concentric camshafts developed by Mechadyne enabling dual-independent inlet/exhaust valve adjustment on the 2008 Dodge Viper.
GM VVT - Varies valve timing continuously throughout the RPM range for both intake and exhaust for improved performance in both overhead valve and overhead cam engine applications.(See also Northstar System).
GM DCVCP (Double Continuous Variable Cam Phasing) - Varies timing with hydraulic vane type phaser (see also Ecotec LE5).
Holden Alloytec - Continuously variable camshaft phasing for inlet cams. Continuously variable camshaft phasing for inlet cams and exhaust cams (High Output Alloytec).
Honda VTEC - Varies duration, timing and lift by switching between two different sets of cam lobes.
Honda i-VTEC - In high-output DOHC 4 cylinder engines the i-VTEC system adds continuous intake cam phasing (timing) to traditional VTEC. In economy oriented SOHC and DOHC 4 cylinder engines the i-VTEC system increases engine efficiency by delaying the closure of the intake valves under certain conditions and by using an electronically controlled throttle valve to reduce pumping loss. In SOHC V6 engines the i-VTEC system is used to provide Variable Cylinder Management which deactivates one bank of 3 cylinders during low demand operation.
Honda VTEC-E - Unlike most VTEC systems VTEC-E is not a cam switching system, instead it uses the VTEC mechanism to allow for a lean intake charge to be used by closing one intake valve under certain conditions.
Hyundai MPI CVVT - Varies power, torque, exhaust system, and engine response.
Kawasaki - Varies position of cam by changing oil pressure thereby advancing and retarding the valve timing, 2008 Concours 14.
Lexus VVT-iE - Continuously varies the intake camshaft timing using an electric actuator.
Mazda S-VT - Varies timing by rotating the camshaft.
Mitsubishi MIVEC - Varies valve timing, duration and lift by switching between two different sets of cam lobes. The 4B1 engine series uses a different variant of MIVEC which varies timing (phase) of both intake and exhaust camshafts continuously.
Nissan N-VCT - Varies the rotation of the cam(s) only, does not alter lift or duration of the valves.
Nissan VVL - Varies timing, duration, and lift of the intake and exhaust valves by using two different sets of cam lobes.
Nissan VVT introduced with the HR15DE, HR16DE, MR18DE and MR20DE new engines in September 2004 on the Nissan Tiida and north american version named Nissan Versa (in 2007); and finally the Nissan Sentra (in 2007).
Nissan VVEL introduced with the VQ37VHR Nissan VQ engine engine in 2007 on the Infiniti G37.
Porsche VarioCam - Varies intake timing by adjusting tension of a cam chain.
Porsche VarioCam Plus - Varies intake valve timing by rotating the cam in relation to the cam sprocket as well as duration, timing and lift of the intake and exhaust valves by switching between two different sets of cam lobes.
Proton Campro CPS - Still under development, said to be based on Lotus technology which developed Porsche's VarioCam.
PSA Peugeot Citroën CVVT - Continuous variable valve timing.
Renault Clio 182, Clio Cup and Clio V6 Mk2 VVT - variable valve timing.
Rover VVC - Varies timing with an eccentric disc.
Suzuki - VVT - Suzuki M engine
Subaru AVCS - Varies timing (phase) with hydraulic pressure, used on turbocharged and six-cylinder Subaru engines.
Subaru AVLS - Varies duration, timing and lift by switching between two different sets of cam lobes (similar to Honda VTEC). Used by non-turbocharged Subaru engines.
Toyota VVT - Toyota 4A-GE 20-Valve engine introduced VVT in the 1992 Corolla GT-versions.
Toyota VVT-i - Continuously varies the timing of the intake camshaft, or both the intake and exhaust camshafts (depending on application).
Toyota VVTL-i - Continuously varies the timing of the intake valves. Varies duration, timing and lift of the intake and exhaust valves by switching between two different sets of cam lobes.
Volkswagen - VVT introduced with the 1.8T engine. The intake timing intentionally runs advanced and a retard point is calculated by the ECU. A hydraulic tensioner retards the intake timing.
Volvo - VVT
Yamaha - VCT (Variable Cam Timing) Varies position of cam thereby advancing and retarding the valve timing.
Proton - VVT introduced in the Waja 1.8's F4P renault engine (toyota supplies the VVT to renault)
Edited by Jon GT2 on Friday 30th November 09:12
My best: 35 mpg, summer, "optimax/vpower" or whatever its called
My worst: 31 mpg, winter, "premium" 95 unleaded
2004 car, no mods.
Mostly steady commuting with the occasional motorway run. Not much opportunity for hooning so rarely over 5k )o:
HTH
Pete
--
My worst: 31 mpg, winter, "premium" 95 unleaded
2004 car, no mods.
Mostly steady commuting with the occasional motorway run. Not much opportunity for hooning so rarely over 5k )o:
HTH
Pete
--
Edited by ChiefWiggum on Tuesday 4th December 13:07
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