What is a Laycock overdrive?
At the press of a button or flip of a switch (depending on the car) in the cockpit, the overdrive would engage and lower the engine speed relative to the driveshaft, markedly improving fuel economy. …
How does a Laycock overdrive work?
Laycock Overdrive A and D Type cone clutch, which was operated by hydraulic pressure. Pressurized oil is fed to the positions when the solenoid lifts a lever and raises the control and ball valves. Laycock Overdrive J Type. This raises the pressure in the circuit and forces the operating pistons down their bores.
What is a Laycock?
Laycock is an English surname, likely originating from the placename Lacock, in Wiltshire (which is pronounced Laycock) or Laycock in West Yorkshire. According to the 1990 United States Census, Laycock is the 22,119th most common surname.
What does electronic overdrive mean?
Overdrive as a definition is simply having a faster transmission output shaft speed than the input rotation speed of the input shaft from the engine. This means torque is effectively being multiplied in a positive sense so being ‘overdriven’, creating a more effortless driving experience.
Should I drive with overdrive on or off?
Overdrive improves fuel economy, and makes for less wear and tear on the vehicle when you are driving at highway speeds. Having the overdrive off is fine if you are driving in hilly areas, but if you are on the highway, it is best to have it on because you will get better gas mileage.
Is it bad to always drive in overdrive?
It’s not bad to drive with overdrive off and does no harm to the transmission. However, you will get worse fuel economy and have more noise at high speeds. There’s really no reason to leave it off unless you need to ascend or descend a steep hill. You can turn overdrive on or off at any time or speed.
How fast can I go with overdrive off?
Remember, you don’t use overdrive if you are driving less than 50 mph because it’s not fast enough or consistent enough. It will not benefit your car to use it when you are driving at slower speeds or in stop and go traffic. The overdrive will only prolong the efficiency of your car’s engine if you use it wisely.
Where can I buy Laycock overdrive spares?
We supply a full and comprehensive parts list for all Laycock de-Normanville overdrive units. We have the largest stock of original, obsolete Laycock parts in the world and re-manufacture all consumable parts. We offer a full re-conditioning service on either your unit or on an exchange basis.
When was the Laycock Normanville overdrive made?
A reproduction of the SERVICE INSTRUCTION MANUAL for the LAYCOCK – DE – NORMANVILLE OVERDRIVE UNIT WITH ELECTRICAL CONTROL purchased from The Roadster Factory (TRF) was used in the preparation of these notes. The original date of publication is not listed but only the TR2 is referenced so I guess it to be late 1950s.
What’s the difference between GV and Laycock od?
Picked up a Laycock P-type overdrive for a good price today. Thinking about swapping it in place of the Gear Vendor that no longer engages in my ’86 F350. (I really miss the OD) Externally it looks exactly the same. The PO says it came out of an ’89 GMC with a 4-speed trans. It looks like it might bolt up to a NP205, but I’m not sure.
How big is a Laycock Model J overdrive?
I began a search that led to a Laycock model J overdrive, about the size and shape of a small watermelon. It fit nicely in mid-frame. I installed two drive shafts, one from the to transmission to the overdrive, the second from the overdrive to the rear end.