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FJBLF
Samba Member
Joined: January 10, 2016
Posts: 213
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 Posted: Sun Jun 17, 2018 4:58 pm Post subject: Re Jeting the carburator. Thoughts??? 30 PICT 1 |
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I'm running an EMPI 30 pict 1 Round bowl carb on my 1500cc, original distributor, The short version (111-905-205 S). it idles fine, but seams to be lacking power at the high end. I read somewhere that re jeting the carb from 120 to 135 on the main and to 60 from 55 on the idle may improve performance. Any thoughts???
Thanks in advance |
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Bashr52
Samba Member
Joined: July 16, 2006
Posts: 5666
Location: On an island in VA
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| Posted: Tue Jun 19, 2018 5:07 am Post subject: Re: Re Jeting the carburator. Thoughts??? 30 PICT 1 |
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| Is there a reason you are running a 1500 instead of the original 1600? That would take a 34PICT carb. |
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Wildthings
Samba Member
Joined: March 13, 2005
Posts: 50332
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| Posted: Tue Jun 19, 2018 5:07 am Post subject: Re: Re Jeting the carburator. Thoughts??? 30 PICT 1 |
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One step at a time is usually the best way to go. Keep good records of what you try.
The amount of change you suggest would be about a 30% increase in the amount of fuel. |
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FJBLF
Samba Member
Joined: January 10, 2016
Posts: 213
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| Posted: Tue Jun 19, 2018 8:13 am Post subject: Re: Re Jeting the carburator. Thoughts??? 30 PICT 1 |
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| Bashr52 wrote: |
| Is there a reason you are running a 1500 instead of the original 1600? That would take a 34PICT carb. |
Mine is a '72 it is a 181 but it is not a "Thing", '72 is the last year it came with 1500 cc |
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FJBLF
Samba Member
Joined: January 10, 2016
Posts: 213
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| Posted: Tue Jun 19, 2018 8:17 am Post subject: Re: Re Jeting the carburator. Thoughts??? 30 PICT 1 |
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| Wildthings wrote: |
One step at a time is usually the best way to go. Keep good records of what you try.
The amount of change you suggest would be about a 30% increase in the amount of fuel. |
I plan to change the main first and then the idle. |
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Wildthings
Samba Member
Joined: March 13, 2005
Posts: 50332
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| Posted: Tue Jun 19, 2018 10:15 am Post subject: Re: Re Jeting the carburator. Thoughts??? 30 PICT 1 |
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| FJBLF wrote: |
| Wildthings wrote: |
One step at a time is usually the best way to go. Keep good records of what you try.
The amount of change you suggest would be about a 30% increase in the amount of fuel. |
I plan to change the main first and then the idle. |
Changing from a 120 to a 135 at one time is going to be too big of a step, unless the engine just dies completely when you step on it. If you were at stoicheometric (14.7 a/f ratio) and made that size of a jump you would likely be at about 10.5 a/r after the jet change which would be too rich. Best to change one jet size at a time. Maybe buy the following jets. 125, 127.5, 130, 132.5, and 135 and work up through them one at a time. |
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FJBLF
Samba Member
Joined: January 10, 2016
Posts: 213
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| Posted: Tue Jun 19, 2018 7:09 pm Post subject: Re: Re Jeting the carburator. Thoughts??? 30 PICT 1 |
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| Wildthings wrote: |
| FJBLF wrote: |
| Wildthings wrote: |
One step at a time is usually the best way to go. Keep good records of what you try.
The amount of change you suggest would be about a 30% increase in the amount of fuel. |
I plan to change the main first and then the idle. |
Changing from a 120 to a 135 at one time is going to be too big of a step, unless the engine just dies completely when you step on it. If you were at stoicheometric (14.7 a/f ratio) and made that size of a jump you would likely be at about 10.5 a/r after the jet change which would be too rich. Best to change one jet size at a time. Maybe buy the following jets. 125, 127.5, 130, 132.5, and 135 and work up through them one at a time. |
Thanks for the input, I'm following the steps of someone who already did it, but I do see your point. If I end too rich I'll step down as you sugest
_________________
1972 VW 181 SAFARI 1500 cc GRB Trans-axle |
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Towel Rail
Horizontally Opposed
Joined: April 15, 2005
Posts: 4622
Location: SE CR IA US NA PE
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| Posted: Tue Jun 19, 2018 10:58 pm Post subject: Re: Re Jeting the carburator. Thoughts??? 30 PICT 1 |
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"Lacking power at the high end" sounds like pretty much every ACVW I've ever driven, especially the brick-shaped ones. Are you sure you don't have a slight vacuum leak somewhere? 
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1974 Thing -- under the knife
1967 Beetle -- spring/summer/fall driver
1996 Subaru OBW (EJ22, 5-speed, AWD) -- winter car, 3-seasons "don't feel like biking today" car
049 > 070 > 053 > 009 |
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Bashr52
Samba Member
Joined: July 16, 2006
Posts: 5666
Location: On an island in VA
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| Posted: Wed Jun 20, 2018 12:32 pm Post subject: Re: Re Jeting the carburator. Thoughts??? 30 PICT 1 |
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| Towel Rail wrote: |
| "Lacking power at the high end" sounds like pretty much every ACVW I've ever driven, especially the brick-shaped ones. Are you sure you don't have a slight vacuum leak somewhere? |
Adding another 600+ cc's seems to help that problem  |
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FJBLF
Samba Member
Joined: January 10, 2016
Posts: 213
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| Posted: Wed Jun 20, 2018 8:07 pm Post subject: Re: Re Jeting the carburator. Thoughts??? 30 PICT 1 |
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| Towel Rail wrote: |
| "Lacking power at the high end" sounds like pretty much every ACVW I've ever driven, especially the brick-shaped ones. Are you sure you don't have a slight vacuum leak somewhere? |
If I have one.... I can't find it.... I've look for it with propane and found nothing....
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1972 VW 181 SAFARI 1500 cc GRB Trans-axle |
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