Post by dave1800 on Aug 12, 2022 3:39:30 GMT
Looking at a hybrid vehicle in a showroom recently I noticed the spec of the petrol engine was on the face of it quite similar to the 1800S. (Source of data Toyota and BMC/BL).
1800S Toyota C-HR
Capacity 1798c 1798cc
Bore 80.26mm 80.5mm
Stroke 88.90mm 88.3mm
Power 96bhp @ 5700 rpm 98 bhp @ 5200 rpm
Torque 106ft lbs @ 3000 rpm 104 ft lbs @ 3600 rpm
CR 9.5:1 13.0:1
The Toyota engine bore and stroke dimensions are clearly governed by the need to keep it narrow to fit the electric motor and associated electronics under the bonnet but also reflect the fact that these bore/ stroke ratios are reported as being close to ideal for economy. The Toyota engine also uses a simulated Atkinson cycle to improve fuel economy hence the high CR.
At first sight it appears not much has improved in 60 years in terms of power despite all the computer modules, sensors and maze of wires but that of course is only part of the story but it does make you wonder!
David
1800S Toyota C-HR
Capacity 1798c 1798cc
Bore 80.26mm 80.5mm
Stroke 88.90mm 88.3mm
Power 96bhp @ 5700 rpm 98 bhp @ 5200 rpm
Torque 106ft lbs @ 3000 rpm 104 ft lbs @ 3600 rpm
CR 9.5:1 13.0:1
The Toyota engine bore and stroke dimensions are clearly governed by the need to keep it narrow to fit the electric motor and associated electronics under the bonnet but also reflect the fact that these bore/ stroke ratios are reported as being close to ideal for economy. The Toyota engine also uses a simulated Atkinson cycle to improve fuel economy hence the high CR.
At first sight it appears not much has improved in 60 years in terms of power despite all the computer modules, sensors and maze of wires but that of course is only part of the story but it does make you wonder!
David
