How To Choose The Correct Timing Set For Your Application
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- Опубліковано 20 гру 2018
- There are a few different typed of timing sets out there, each for a specific application. Pat will also go over why each set is used for each application. Keep in mind these parts are for performance bullets, not stock engines.
In the 1960s, roller timing chains were introduced. There were 2 different types available: a single roller and a double roller. A single row has one row of gears on the sprockets and as you would imagine, a double roller has two.
Most original equipment push rod engines including current ones us a single row timing chain. A good example is today's LS. It uses a single row because it doesn't require a lot of spring pressure to run the valve train and is a more compact setup on the front of the block.
When the valve spring pressure is significantly increased along with the power output and rise in the RPM ceiling, a double row chain will control the valve train better because it spreads the load between two sets of gears. The engine's cam timing will then be more stable.
Keep in mind both single and double row timing sets will stretch over time. In addition to affecting the cam timing, in extreme cases, it will affect the ignition timing by as much as 3 or 4 degrees. At that point, the engine is dangerously close to a catastrophic failure because the chain is ready to break.
As far as materials go, most hotrod types are made out of regular cast iron. But the pinnacle of timing sets are the bullet type, both on the crank and cam gear. These are typically fully adjustable.
If you were hotrodding in the '80s, then you probably remember hearing what a gear drive setup sounds like. There are advantages and disadvantages for a gear drive. On the good side, they are extremely accurate when controlling the position of the cam since there is no stretch involved. The downside is they are slightly too obnoxiously noisy in their operation and induce mechanical residence into the valvetrain sometimes causing issues in extreme performance applications. They are still available for popular engine combinations so if you like that high-pitched whine, these might be for you.
One of the ultimate timing set ups is a belt drive setup. These are specifically engineered to provide accurate cam timing, ease of adjustment, and have great longevity.
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This video didn't explain when you would need to upgrade or why, it's just, look different timing chains. Pick one.
Yea lol. That what I was left thinking 🤔
Rewatch the video, he covers it in a limited way. He mentions upgrading if you go with added valve spring pressure or increased RPM. I would read into that a little more and say along with an upgraded cam, valve springs and RPM I would upgrade if you are running a high pressure or high volume oil pump as the chain indirectly drives the pump - you know - distributor to oil pump shaft to cam gear to chain. I think we all get it - if your motor is being upgraded, at least upgrade to a double roller chain.
Great video thank you. What timing chain would you recommend for a chevy 5.7 LT1 motor. I'm trying to upgrade stock engine to about 350 horsepower
"the ultimate timing set-up is a belt drive set-up"..... For a second I thought he knew what he was talking about... And then he said that.
Dylan Lucas Maybe if you only race and you tear the engine down after each day at the track. Roller sets are so reliable they aren’t really even considered wear items for scheduled replacement on stock vehicles.
Those gear drives are too loud. I hate riding in my dad's 37 chevy with that thing!
@@butteredbiskit3497 I love being able to hear the engine, but to each his own I guess
Had gear drive in 73 nova it stole the chop
never trust rubber...
there teeth on sprockets not gears
Millions of diesels covering billions of miles with gear drive cams. Every Powerstroke, every Cummins, every rig on the highway. Nothing else comes close to that level of proven reliability.
I also love how every video that talks about gear drives only shows the garbage floppy idler junk. OEMs use fixed idlers. And fixed idler systems are available for the same engines as those garbage systems. Much quieter, more precise, more reliable.
Timing belts are the least reliable system. No way I would put one in an engine.