Portal Gear Reduction Calculator

FAQs

What gear reduction do I need for portals? The gear reduction needed for portals depends on your specific vehicle and application. Common portal gear reductions range from approximately 1.5:1 to 4:1.

What do portals do on a side by side? Portals on a side-by-side vehicle provide increased ground clearance by raising the axle and allow for larger tires, improving off-road capability.

How do you calculate the gear ratio of a transmission? To calculate the gear ratio of a transmission, divide the number of teeth on the input gear (driving gear) by the number of teeth on the output gear (driven gear).

How do you calculate road speed from gear ratio? You can calculate road speed using the formula: Speed (in mph) = (RPM * Tire Diameter) / (Axle Ratio * 336). Axle ratio is the gear ratio of the differential.

Are portals good for rock crawling? Yes, portals are often used in rock crawling vehicles because they provide improved ground clearance and torque multiplication, making it easier to navigate obstacles.

What are 4 inch portals? 4-inch portals refer to portal gear reduction units that provide a 4:1 gear reduction, which is a common option for off-road vehicles.

How much wider do portals make side by side? Portals typically add width to a side-by-side vehicle. The exact amount can vary depending on the portal design and manufacturer, but it’s usually a few inches on each side.

What are the three types of portals? There are various portal designs, but three common types are single idler, dual idler, and offset portal designs.

How does portal gear reduction work? Portal gear reduction works by using a set of gears in the portal box to reduce the rotational speed of the wheel relative to the axle shaft, which provides increased torque to the wheels.

Is it better to have a higher or lower gear ratio? A higher gear ratio (numerically higher) provides more torque and better acceleration, while a lower gear ratio (numerically lower) offers higher top speed and better fuel efficiency.

What is the formula for reduction ratio? The reduction ratio formula is: Reduction Ratio = (Input Speed) / (Output Speed).

How do you calculate speed reduction gearbox? Speed reduction in a gearbox is calculated by dividing the input speed by the output speed. The gear ratios of the gearbox determine this reduction.

What is the formula for calculating gears? To calculate the gear ratio, you can use the formula: Gear Ratio = (Number of Teeth on Driven Gear) / (Number of Teeth on Driving Gear).

How do you calculate RPM at 60 mph? RPM (revolutions per minute) at a given speed can be calculated using the formula: RPM = (Speed * Axle Ratio * 336) / Tire Diameter.

How do you calculate gearbox ratio from RPM? To calculate the gearbox ratio, divide the input RPM by the output RPM.

Can you put portals on a straight axle? Yes, portals can be added to a straight axle to achieve increased ground clearance.

What fluid goes in portals? Portals typically use gear oil or differential oil. The specific type and viscosity may vary depending on the manufacturer’s recommendations.

Are portal axles better than straight axles? Portals offer advantages in ground clearance but may have limitations in terms of added complexity and cost compared to straight axles.

What is the minimum rim size for 4-inch portals? The minimum rim size for 4-inch portals depends on the specific portal design and manufacturer. Typically, a larger rim size is required to accommodate the larger tires commonly used with portals.

What are portals 4×4? Portals 4×4 refers to a four-wheel-drive (4×4) vehicle equipped with portal axles for improved off-road performance.

What are portals good for? Portals are good for off-road vehicles, especially in situations where increased ground clearance and torque multiplication are beneficial.

Are portals hard on ball joints? Portals can put added stress on ball joints and other suspension components, potentially leading to increased wear and maintenance requirements.

What is the difference between Gen 2 and Gen 3 portals? The specific differences between Gen 2 and Gen 3 portals can vary depending on the manufacturer. Typically, Gen 3 portals offer improvements in design, strength, and performance over Gen 2 portals.

How much fluid do portals take? The amount of fluid required for portals can vary depending on the specific portal design. Typically, it ranges from a few quarts to a gallon or more per portal.

What is the difference between vertical and horizontal portal? Vertical and horizontal portals refer to different configurations of portal axles. Vertical portals have a vertical gear reduction, while horizontal portals have a horizontal gear reduction.

What is a portal lift? A portal lift is a modification that raises a vehicle’s ground clearance by installing portal axles, allowing for larger tires and improved off-road capability.

Why do you need gear reduction? Gear reduction is used to increase torque and reduce the rotational speed of an output shaft relative to an input shaft, making it suitable for various applications.

Does gear reduction increase HP? Gear reduction itself doesn’t increase horsepower, but it can increase torque, which can improve the vehicle’s overall performance.

What is the most comfortable gear ratio? The most comfortable gear ratio depends on the vehicle’s intended use. Lower (numerically higher) gear ratios often provide better low-end torque and off-road performance, while higher (numerically lower) ratios offer higher top speed and fuel efficiency.

What gear ratio is most efficient? The most efficient gear ratio depends on the specific application. In some cases, a balance between torque and speed is desired for optimal efficiency.

What is the limit reduction ratio? The limit reduction ratio is the maximum gear reduction achievable by a specific gear system or transmission.

What is the maximum reduction in a gearbox? The maximum reduction in a gearbox depends on the design and the number of gear stages. It can vary significantly.

What is a 2:1 reduction gearbox? A 2:1 reduction gearbox reduces the input speed by a factor of 2 while increasing the output torque by the same factor.

What gear ratio is best for torque? Lower (numerically higher) gear ratios are best for torque because they provide mechanical advantage and increased force at lower speeds.

What is the gear ratio for dummies? The gear ratio represents the relationship between the number of teeth on two gears. It tells you how many times one gear will rotate compared to the other.

What is the velocity ratio of a gear ratio? The velocity ratio of a gear ratio represents the relationship between the angular velocities (rotational speeds) of the two gears involved in the gear system.

What is the formula for velocity ratio? The velocity ratio is calculated as the ratio of the number of teeth on the driven gear to the number of teeth on the driving gear.

How many RPMs is 70 mph? The RPM at 70 mph depends on the specific vehicle’s gear ratios and tire size. It can vary widely but is typically in the range of 2000-3000 RPM for most passenger cars.

What should RPM be at 65 mph? The RPM at 65 mph depends on the vehicle’s gear ratios and tire size. For many vehicles, it’s in the range of 1800-2500 RPM.

How fast is 12000 RPM in mph? The speed in mph at 12,000 RPM depends on the vehicle’s gear ratios and tire size. It can vary significantly between different vehicles.

How do I choose a gearbox ratio? The choice of a gearbox ratio depends on the specific application and the desired balance between speed and torque. Consult the manufacturer’s recommendations or perform calculations based on your requirements.

How do you change gears according to RPM? Changing gears according to RPM involves shifting to a higher gear (upshifting) when RPM is higher and shifting to a lower gear (downshifting) when RPM is lower to maintain a suitable speed-torque relationship.

How do you calculate gear ratio on a calculator? To calculate gear ratio on a calculator, divide the number of teeth on the driven gear by the number of teeth on the driving gear and enter the values into the calculator.

What are the disadvantages of the portal axle? Some disadvantages of portal axles include increased complexity, potential maintenance requirements, added weight, and cost.

What happens when you put two portals together? Putting two portals together can further increase ground clearance and provide even greater torque multiplication, making the vehicle better suited for extreme off-road conditions.

How often do you change portal oil? The frequency of changing portal oil depends on the manufacturer’s recommendations and usage conditions. Typically, it’s recommended at specific service intervals.

When should I change my portal oil? You should change portal oil according to the manufacturer’s recommended service intervals or if you notice signs of contamination or degradation.

How do the portals from portal work? Portals use a gear reduction mechanism within the portal box to reduce the rotational speed of the wheel relative to the axle shaft, resulting in increased torque and ground clearance.

Are portal axles strong? Portal axles are designed to be strong and durable, but their strength can vary depending on the design and manufacturer. High-quality portals are engineered to withstand off-road demands.

Why use portal axles? Portal axles are used to increase ground clearance, accommodate larger tires, and provide improved off-road performance, making them popular for off-road and rock crawling applications.

Why are straight axles better? Straight axles are often simpler and more robust than portal axles, making them better suited for heavy-duty and high-load applications.

How much fluid does a 4 portal hold? The amount of fluid that a set of four portals holds can vary depending on the specific portal design and manufacturer. It typically ranges from a quart to several quarts per portal.

How much bigger can you go on rim size? The maximum rim size you can use depends on your vehicle’s specifications, including suspension and fender clearance. Larger rims typically allow for larger tires.

Can I go up a rim size? Going up a rim size is possible if your vehicle’s specifications and clearances allow for it. Consult your vehicle manufacturer’s recommendations.

Do portal axles increase torque? Yes, portal axles can increase torque at the wheels due to the gear reduction they provide.

Can you put portals on a straight axle? Yes, portals can be added to a straight axle to achieve increased ground clearance and torque multiplication.

What vehicles came with portal axles? Portal axles are commonly used in off-road and military vehicles, but their application can vary widely.

What are the three types of portals? The three common types of portal axles are single idler, dual idler, and offset portal designs. Each has its own advantages and disadvantages.

What is gear reduction on portals? Gear reduction on portals refers to the process of reducing the rotational speed of the wheel relative to the axle shaft using a gear mechanism within the portal box.

What destroys ball joints? Ball joints can be destroyed by wear and tear, excessive loads, poor maintenance, or off-road abuse.

What is the life expectancy of a ball joint? The life expectancy of a ball joint can vary depending on factors such as vehicle usage, maintenance, and quality of components. It can range from tens of thousands of miles to over 100,000 miles.

What gear oil to put in portals? The type and viscosity of gear oil to use in portals can vary depending on the manufacturer’s recommendations. It’s typically a high-quality gear oil designed for heavy-duty applications.

What is the difference between single idler and dual idler portals? Single idler portals have one idler gear, while dual idler portals have two. Dual idler portals can distribute loads more evenly and often provide better strength.

How much wider do portals make you? The width added by portals can vary depending on the specific portal design and manufacturer, but it’s typically a few inches on each side.

What is the difference between Gen 2 and Gen 3 portals? The specific differences between Gen 2 and Gen 3 portals can vary depending on the manufacturer, but Gen 3 portals often feature design improvements for strength and performance.

What are the two types of portals? The two primary types of portals are single idler and dual idler portals, with variations within these categories.

What is an example of a horizontal portal? An example of a horizontal portal might be a website or platform where information is organized and accessed horizontally, such as a social media feed.

Are portals hard on ball joints? Portals can put added stress on ball joints and other suspension components, potentially leading to increased wear and maintenance requirements.

What are 4 inch portals? 4-inch portals refer to portal gear reduction units that provide a 4:1 gear reduction, which is a common option for off-road vehicles.

How many types of portals are there? There are various portal designs available, but they can generally be categorized into single idler, dual idler, and offset portal types.

What vertical portal means? A vertical portal typically refers to a website or online platform that focuses on a specific industry, topic, or niche, providing content and resources related to that vertical.

Please note that the answers provided are general and may vary based on specific vehicle configurations and manufacturers’ recommendations.