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Throttle Setting on First Start on Bench
Posted by: Frog ()
Date: October 06, 2019 06:20AM

What's the tried-and-true rig to set and hold the throttle for the recommended 20 minutes at 2,000 RPM on initial run of bench-mounted, rebuilt engine?

Thank you.

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Re: Throttle Setting on First Start on Bench
Posted by: MattNall ()
Date: October 06, 2019 07:23AM

Passenger side carb... something under the throttle lever.. between it and intake.

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Re: Throttle Setting on First Start on Bench
Posted by: Frog ()
Date: October 06, 2019 07:38AM

Thank you.

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Re: Throttle Setting on First Start on Bench
Posted by: Frank DuVal ()
Date: October 06, 2019 09:48AM

Folded paper under right side idle screw.

Frank DuVal

Fredericksburg, VA

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Re: Throttle Setting on First Start on Bench
Posted by: JimBrandberg ()
Date: October 07, 2019 05:23AM

There is often a lot of heat generated that first time so I don't usually run it for 20 minutes, prefering to let it cool down after a few minutes and then go again.
Rather than a steady speed I like to vary the speed as long as it's not too slow.
I'm prepared to listen to discussion on why I might be off base.

Jim Brandberg
Isanti, MN
CorvairRepair.com



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Re: Throttle Setting on First Start on Bench
Posted by: vairmech ()
Date: October 07, 2019 05:42PM

Actually if your fast idle cams are adjusted properly you should have just under 2000 rpm. I generally set one or both after starting. I also do not just keep a steady rpm but vary at times, you can give it a goose and even let it go to idle then right back up to speed. It does not hurt to stop the engine, let the engine return to idle first, and let it cool or to check things over.

The ONLY reason for the rpm is to get the lifters to rotate for the cam and lifter break-in.

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

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Re: Throttle Setting on First Start on Bench
Posted by: joelsplace ()
Date: October 07, 2019 06:33PM

That is interesting. The only time I've read anything about the reasoning was probably 30 years ago (maybe Isky or Comp Cams) in reference to small block Chevys it claimed the reason for the RPM for break in was that the cam didn't get enough oil at idle. It relied on the splash from the crank and rods spinning.
I can see how lifter rotation would also be important.

Joel
Northlake, TX
5 Ultravans, Lost count at 100 Corvairs...

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