Why are pushrod engines better than hot cams?
Installing a hot cam with more lift and duration means you’ll also have to upgrade the pushrods and valve springs to handle the higher engine speeds and loads. Pushrod engines are the preferred choice of many in the performance and racing world because of their simple design and low-end power capability.
When do you change pushrods on an OHV engine?
When you start modifying OHV engines from their stock form – meaning low speed, light load, and rpms in the 6,000 to 6,500 range – the dynamics change. Installing a hot cam with more lift and duration means you’ll also have to upgrade the pushrods and valve springs to handle the higher engine speeds and loads.
Why do pushrods need to be stiffer at high RPM?
As rpms go up, the need for stiffer valve springs, stiffer pushrods, and lighter valvetrain components (valves, retainers, and rockers) also increases. Pushrods under load at high engine speed wobble and flex. That’s not good for valvetrain stability, valve timing, or consistent power.
How much does Crossflow Kent fast road camshaft cost?
CROSSFLOW KENT FAST ROAD CAMSHAFT – PART No. A2 – Around 500 miles only use. Photo and close up pics available on request. 3000-7000rpm power band, valve lift 0.349″ / 0.347″, duration 286 degrees. Cost new around £150 or more. Asking £75.00. Will require NEW cam followers.
What’s the difference between pushrods and cams?
The difference in installation labor could make up for the extra cost. Adjustable for future upgrades and tappet replacement. Made of super strong chromoly steel for minimum pushrod flex and more accurate valve timing. Kit includes everything needed for a quick install! Precision machined and 100% tested to ensure a precision fit.
What kind of pushrods do I need for S & S cycle?
S&S® offers a variety of cam grinds for Milwaukee-Eight & Big Twin engines in both chain drive and gear drive versions. Cams that exceed the limits of the stock valve springs require the use of special high lift springs. Due to the high lift of these cams, S&S adjustable pushrods are recommended.
Is the pushrod engine still around in cars?
The pushrod engine – such as this Chrysler pushrod V-6 – is still around, despite the popularity of overhead cam engines. Image from Wikimedia Commons. The low and uninitiated may see the terms “pushrod” and “overhead cam” advertised and wonder what it is and if it makes any difference at all.
What kind of Cams does a Harley Davidson use?
Your stock Harley cam is chain driven out of the factory. Generally speaking, gear driven cams for Harley are a bit more reliable long-term. Gear driven cams do whine a bit over the stock chain driven cams.