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BFB
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Joined: November 03, 2014
Posts: 2525
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 Posted: Tue Jan 12, 2021 11:01 am Post subject: starting rpm? |
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what do yall figure is a starting rpm for vw engine? not idle rpm but at what rpm the engine will fire up
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"how am i supposed to torque the rear wheel nut to 250 ft lbs??? " - clonebug
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chrisflstf
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Joined: February 10, 2004
Posts: 3982
Location: San Diego
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| Posted: Tue Jan 12, 2021 11:04 am Post subject: Re: starting rpm? |
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| You mean cranking rpm. Pull the coil wire and measure it |
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buguy
Samba Member
Joined: November 17, 2003
Posts: 4915
Location: Port Orange, FL
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| Posted: Tue Jan 12, 2021 11:15 am Post subject: Re: starting rpm? |
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| I don't remember exactly but i think mine is in the 250rpm range. |
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oprn
Samba Member
Joined: November 13, 2016
Posts: 14584
Location: Western Canada
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| Posted: Tue Jan 12, 2021 12:37 pm Post subject: Re: starting rpm? |
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It can be a fairly wide range if your ignition and fuel system is good. In my country cranking speed is totally weather dependent. I have also had one start accidently while cranking it over with a ratchet setting the valve lash. What RPM would that be?
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Our cars get old, we get old but driving an old VW never gets old! |
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BFB
Samba Member
Joined: November 03, 2014
Posts: 2525
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| Posted: Tue Jan 12, 2021 1:03 pm Post subject: Re: starting rpm? |
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| chrisflstf wrote: |
| You mean cranking rpm. Pull the coil wire and measure it |
no, not really. that would be related to starter's rpm. im wondering at what rpm the engine might actually pop of and start running on its own.
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| oprn... start accidently while cranking it over with a ratchet setting the valve lash. What RPM would that be? |
thats awesome! and scary as hell, im sure
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| bugu.. i think mine is in the 250rpm range. |
if oprn had his pop of by hand then 250 wouldnt be unreasonable. and on that note, if you push start a vw they seem to fire at a pretty low rpm, at least when i have
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"how am i supposed to torque the rear wheel nut to 250 ft lbs??? " - clonebug
An interesting thing happens in forums where everyone starts parroting the same thing and "common knowledge" takes over.
Most experts aren't. |
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UK Luke 72
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Joined: September 07, 2011
Posts: 2875
Location: Little Britain
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HotStreetVw
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Joined: October 03, 2004
Posts: 871
Location: Wild West
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| Posted: Tue Jan 12, 2021 2:08 pm Post subject: Re: starting rpm? |
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pull it behind a truck and with the clutch out and key on run. watch the speedo and back calculate the rpms from tire size and ratios.
I've pushed started a bunch of cars, it doesn't take much.
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4inBhore
50 Split - 2724cc NA. Haltech injected
62 Notchback - 2542cc Turbo WIP |
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buguy
Samba Member
Joined: November 17, 2003
Posts: 4915
Location: Port Orange, FL
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| Posted: Tue Jan 12, 2021 4:00 pm Post subject: Re: starting rpm? |
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| Agreed. It doesn't take much. I just know mine logs around 250 rpm on the starter. I'm pretty sure when i had the 1200cc i could have spun the tire by hand and it would have started. |
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Pruneman99
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Joined: February 22, 2012
Posts: 5013
Location: Oceanside
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| Posted: Tue Jan 12, 2021 4:07 pm Post subject: Re: starting rpm? |
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| oprn wrote: |
| It can be a fairly wide range if your ignition and fuel system is good. In my country cranking speed is totally weather dependent. I have also had one start accidently while cranking it over with a ratchet setting the valve lash. What RPM would that be? |
Why was the ignition on while doing a valve adjustment? |
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oprn
Samba Member
Joined: November 13, 2016
Posts: 14584
Location: Western Canada
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| Posted: Tue Jan 12, 2021 4:35 pm Post subject: Re: starting rpm? |
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| Pruneman99 wrote: |
| oprn wrote: |
| It can be a fairly wide range if your ignition and fuel system is good. In my country cranking speed is totally weather dependent. I have also had one start accidently while cranking it over with a ratchet setting the valve lash. What RPM would that be? |
Why was the ignition on while doing a valve adjustment? |
Brain fart. 
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Pruneman99
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Joined: February 22, 2012
Posts: 5013
Location: Oceanside
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| Posted: Tue Jan 12, 2021 4:37 pm Post subject: Re: starting rpm? |
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| Lol. It happens. Must have scared the bejesus out of you. |
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chrisflstf
Samba Member
Joined: February 10, 2004
Posts: 3982
Location: San Diego
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| Posted: Tue Jan 12, 2021 5:11 pm Post subject: Re: starting rpm? |
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| The starting rpm, being when consecutive plugs fire without stopping, cannot be any faster than the rpm that the starter can spin the motor. It may be some less. Most good motors will start within 1 or 2 revs. |
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Floating VW
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Joined: April 28, 2015
Posts: 1615
Location: The South Zone
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| Posted: Tue Jan 12, 2021 5:27 pm Post subject: Re: starting rpm? |
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If you have good compression, a proper air/fuel ratio in at least one cylinder and the right ignition system, I'm guessing the lowest RPM you need to start the engine is . . . 1.
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Iowa Mark
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Joined: May 06, 2004
Posts: 1072
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| Posted: Tue Jan 12, 2021 6:26 pm Post subject: Re: starting rpm? |
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| Floating VW wrote: |
| If you have good compression, a proper air/fuel ratio in at least one cylinder and the right ignition system, I'm guessing the lowest RPM you need to start the engine is . . . 1. |
I agree. Old John Deere 2 cylinder engine. Using the exposed flywheel, bring the engine up on compression , turn the key on , adjust the choke and pull the flywheel through TDC. PoP! and we are running. One quarter turn. |
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buguy
Samba Member
Joined: November 17, 2003
Posts: 4915
Location: Port Orange, FL
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| Posted: Tue Jan 12, 2021 6:37 pm Post subject: Re: starting rpm? |
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The best starting mine has ever been was with the silly turbo, mechanical secondary 450 cfm 4 barrel drawthrough.
Link
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cbeck
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Location: high ridge, mo
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Rome
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Joined: June 02, 2004
Posts: 10440
Location: Pearl River, NY
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| Posted: Tue Jan 12, 2021 9:04 pm Post subject: Re: starting rpm? |
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| Quote: |
| How fast can you hand crank a model t? |
VW provided a hole in the Beetle's rear apron and a support on the rear bumper for a hand crank thru 1948. Discontinued as of the '49's per VWoA's "What year is it" brochure.
A local friend had a '57 (?) single-cab pickup on which he rebuilt the 36 hp engine to factory tolerances. He demonstrated starting the engine using a hand crank. It only took maybe 1/3 to 1/2 turn of the crank, though a hefty turn. This was his yellow pickup in the background of Stock Steve's photo at the Orangeburg, New York Vintage VW Club of America meet in spring 1991. George is wearing the blue cap by the white awning, selling parts.
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madmike
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Joined: July 11, 2005
Posts: 5299
Location: Atlanta,Michigan
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| Posted: Wed Jan 13, 2021 5:06 am Post subject: Re: starting rpm? |
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Iowa Mark,,I had a 1939 B 'Poppin Johnny' hurt my back stating it 'hot ,,fired right up cold,lol
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oprn
Samba Member
Joined: November 13, 2016
Posts: 14584
Location: Western Canada
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| Posted: Wed Jan 13, 2021 5:27 am Post subject: Re: starting rpm? |
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I was going to mention tractors and aircraft starting by hand too but that is a bit different as they have magnetos that have a hand crank timing delay mechanism that snaps quickly to to give a good hot spark no matter how slow you turn them over.
The OP is not off the mark too far actually as I have noticed that to modern cars with their electronic ignition do require a higher starting speed and more turns before they will fire. None of the modern cars I have owned or driven start on the first or second compression like the old STOCK VWs used to. They all seem to have to make a dozen or so rounds before they go.
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Glenn 
Mr. 010
Joined: December 25, 2001
Posts: 79273
Location: Sneaking up behind you
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| Posted: Wed Jan 13, 2021 5:31 am Post subject: Re: starting rpm? |
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Ever seen a Split started with a hand crank?
So i'd say 1 rpm can do it.
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
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