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Craigbro
Samba Member
Joined: January 26, 2021
Posts: 189
Location: Louisiana, USA
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 Posted: Sat Apr 02, 2022 3:38 pm Post subject: Timing with Degree Pulley - Questions |
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So just getting my engine installed after replacing seals, pushrod tubes, etc.
I have adjusted points and valves and looking to check timing.
I have a old school timing gun so no advance. I did static timing to get started.
I have a pully with degree markings and used this to set the valves.
So the questions-
When I start the engine and check timing I get about 29 degrees at idle. I idle up to 3000 and get around 50 degrees. These are rough numbers.
I'm guessing that with an timing gun with advance the 29 would read zero like it should?
What should I read idling at 3000? How does the math work?
Never did this before, just been reading. Is there another way that I should be doing this? |
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c21darrel
Samba Member
Joined: January 22, 2009
Posts: 8236
Location: San Dimas
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Glenn 
Mr. 010
Joined: December 25, 2001
Posts: 79370
Location: Sneaking up behind you
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| Posted: Sat Apr 02, 2022 4:27 pm Post subject: Re: Timing with Degree Pulley - Questions |
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| c21darrel wrote: |
| Mech or vacuum distrib? they are done differently i believe. |
Mechanical only, set 28-32º BTDC @ 3500rpm
Vacuum/mechanical, remove the vacuum line, plug the port on the carb, then set to 28-32º BTDC @ 3500rpm
Vacuum only, remove the vacuum line, plug the port on the carb, set to 7/5º BTDC @ 800rpm
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
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עַם יִשְׂרָאֵל חַי |
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NoDents
Samba Member
Joined: May 31, 2017
Posts: 450
Location: So Cal
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| Posted: Sat Apr 02, 2022 5:10 pm Post subject: Re: Timing with Degree Pulley - Questions |
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NEVER GO OVER 32 at any RPM.
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No Dents
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Craigbro
Samba Member
Joined: January 26, 2021
Posts: 189
Location: Louisiana, USA
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| Posted: Sat Apr 02, 2022 6:53 pm Post subject: Re: Timing with Degree Pulley - Questions |
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| Glenn wrote: |
| c21darrel wrote: |
| Mech or vacuum distrib? they are done differently i believe. |
Mechanical only, set 28-32* BTDC @ 3500rpm
Vacuum/mechanical, remove the vacuum line, plug the port on the carb, then set to 28-32* BTDC @ 3500rpm
Vacuum only, remove the vacuum line, plug the port on the carb, set to 7/5* BTDC @ 800rpm |
Alright, so its a Mechanical distributor (0 231 178 009 JF 4) no vacuum line so set at 28-32 BTDC @3500. I will take a look tomorrow and report back.
Thanks for the replies! |
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Craigbro
Samba Member
Joined: January 26, 2021
Posts: 189
Location: Louisiana, USA
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| Posted: Sun Apr 03, 2022 11:03 am Post subject: Re: Timing with Degree Pulley - Questions |
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Alright, think I'm on the right track. Not sure why the readings were so off yesterday but I believe everything looks more normal today.
With the static timing I was idling around 12 and mid 30s at 3500. I lowered it at idle to 7.5 and at 3500 its right at 30.
Looking at the degrees while timing I'm looking at the markings to the right of TDC. To clarify, this is correct? |
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runamoc
Samba Member
Joined: June 19, 2006
Posts: 6058
Location: 37.5N 77.1W
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| Posted: Mon Apr 04, 2022 8:18 am Post subject: Re: Timing with Degree Pulley - Questions |
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| Quote: |
| set 28-32º BTDC @ 3500rpm |
The setting you choose will depend on the octane of the gas you use.
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Tom K.
Samba Member
Joined: March 10, 2005
Posts: 1692
Location: Central Pennsylvania
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| Posted: Mon Apr 04, 2022 9:15 am Post subject: Re: Timing with Degree Pulley - Questions |
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| Craigbro wrote: |
Alright, think I'm on the right track. Not sure why the readings were so off yesterday but I believe everything looks more normal today.
With the static timing I was idling around 12 and mid 30s at 3500. I lowered it at idle to 7.5 and at 3500 its right at 30.
Looking at the degrees while timing I'm looking at the markings to the right of TDC. To clarify, this is correct? |
Yes, your timing light will illuminate a mark on your pulley that is to the right of TDC. Your timing now looks good based on your latest numbers.
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