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porkchop-rob
Samba Member
Joined: April 28, 2015
Posts: 454
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 Posted: Yesterday 9:26 am Post subject: DRLA Jetting |
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I am looking for help with a starting point for setup/jetting on some DRLA 36s for my son's Baja.
The engine is this:
1956cc - 76x90.5
Engle FK-42 Cam
1.4:1 Rockers
CB Panchito Heads (40x35.5, CNC Chamber, dual valve springs)
Magnaspark Distributor and coil
1 1/2" Baja header with resonator/muffler (straight through)
Dual Dellorto 36s
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1965 Beetle
1968 Beetle Baja (Son's First Car)
1976 Bus with Subaru (Wife's Riviera Camper) |
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jeffrey8164
Samba Member
Joined: January 06, 2018
Posts: 4118
Location: Georgia
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| Posted: Yesterday 12:00 pm Post subject: Re: DRLA Jetting |
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36s are on the small side for that size engine. Mostly used on 1600-1776 engines but maybe theyâll be ok.
Iâll take a look at my Dellorto book and see what it says about venturi size etc and report back
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Turning owners into mechanics since 1938.
âLet he that is without oil throw the first rodâ
(Compression 8.7:1) |
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porkchop-rob
Samba Member
Joined: April 28, 2015
Posts: 454
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| Posted: Yesterday 12:19 pm Post subject: Re: DRLA Jetting |
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| jeffrey8164 wrote: |
36s are on the small side for that size engine. Mostly used on 1600-1776 engines but maybe theyâll be ok.
Iâll take a look at my Dellorto book and see what it says about venturi size etc and report back |
Thank You!
_________________
1965 Beetle
1968 Beetle Baja (Son's First Car)
1976 Bus with Subaru (Wife's Riviera Camper) |
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jeffrey8164
Samba Member
Joined: January 06, 2018
Posts: 4118
Location: Georgia
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| Posted: Yesterday 1:33 pm Post subject: Re: DRLA Jetting |
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Ok so having a look at the book and some parts suppliers hereâs what Iâve found.
For your 1956 youâre looking at 36mm venturis which should be good to around 5500 rpm.
Dellorto Parts UK only lists 32mm as the largest available for 36s but CB lists a 36mm vent but I havenât called them to find out if thatâs actually true or available.
If your current 36s still have factory stuff you should have:
30 Vents
180 Air
122 Main
60 Idle
50 ACC pump
If the 36mm vents are true and available, you should start with 150 mains and 65 idles. Leave the Airs and the pumps the same.
These are all just theoretical numbers based on math so Iâd get some extra extra idles, one step down and maybe 2 steps up and a step above on the mains.
If you find that the largest vent is only a 32mm then youâre in the market for larger carbs as 32s will suffer above 4500 rpm no matter the jetting.
If Iâm wrong Iâm sure someone else will chime in.
Hope this helps.
_________________
Volkswagen!
Turning owners into mechanics since 1938.
âLet he that is without oil throw the first rodâ
(Compression 8.7:1) |
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porkchop-rob
Samba Member
Joined: April 28, 2015
Posts: 454
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| Posted: Today 10:41 am Post subject: Re: DRLA Jetting |
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| jeffrey8164 wrote: |
| Ok so...Hope this helps. |
You are the MAN!
I Greatly appreciate your efforts. I will pull them apart and report back on the findings.
That said, this is in my son's car, unless there is some reliability concern...I am completely okay with her running out of breath at 5000 RPMs.
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1965 Beetle
1968 Beetle Baja (Son's First Car)
1976 Bus with Subaru (Wife's Riviera Camper) |
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mcmscott
Samba Member
Joined: March 12, 2010
Posts: 4919
Location: sanger ca
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| Posted: Today 12:03 pm Post subject: Re: DRLA Jetting |
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36mm vent in a 36mm carb????
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67 T-1
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02 Mexican beetle
74 Thing
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