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SteveW
Samba Member
Joined: February 21, 2004
Posts: 176
Location: Nottinghamshire, UK
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 Posted: Thu Jan 02, 2020 4:05 pm Post subject: 28PCI on a 40hp engine and tuning. |
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I have a 1969 34/40hp '122' industrial engine in my '61 beetle, it came fitted with a 28PCI carb which is in great condition and the engine runs great. My first query is jetting, currently the carb has a 21.5mm venturi, 125 main jet and a 195 air correction jet. Does that sound right for this carb on a 40hp engine? The engine ran great and I have no real reason to suspect anything is wrong but I want to make sure everything is as good as it can/should be.
I'd also like to, if possible, extract a touch more power from the engine so if that means re-jetting that's ok, gas mileage is not my primary concern. I have a rebuilt 019 distributor to install and i'm wondering whether to fit some 1.25 rockers on the intake? The muffler I have is a VW stamped item but it has larger end pipes, i'm not sure if this would have been from when it was used as an actual industrial motor, they definitely aren't pea shooter pipes! At this moment in time I'm looking for mild tuning improvements on the stock engine.
When the time comes for more in depth tuning I have a spare 1970 40hp engine to use to rebuild or for parts (a spare set of 373 heads for example).
Thanks in advance!
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Steve
1951 Type 1 11c - Chestnut Brown
1995 T3 - South African RHD Microbus / 2.6i |
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spencerfvee
Samba Member
Joined: August 19, 2004
Posts: 3071
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| Posted: Thu Jan 02, 2020 4:47 pm Post subject: Re: 28PCI on a 40hp engine and tuning. |
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| SteveW wrote: |
I have a 1969 34/40hp '122' industrial engine in my '61 beetle, it came fitted with a 28PCI carb which is in great condition and the engine runs great. My first query is jetting, currently the carb has a 21.5mm venturi, 125 main jet and a 195 air correction jet. Does that sound right for this carb on a 40hp engine? The engine ran great and I have no real reason to suspect anything is wrong but I want to make sure everything is as good as it can/should be.
I'd also like to, if possible, extract a touch more power from the engine so if that means re-jetting that's ok, gas mileage is not my primary concern. I have a rebuilt 019 distributor to install and i'm wondering whether to fit some 1.25 rockers on the intake? The muffler I have is a VW stamped item but it has larger end pipes, i'm not sure if this would have been from when it was used as an actual industrial motor, they definitely aren't pea shooter pipes! At this moment in time I'm looking for mild tuning improvements on the stock engine.
When the time comes for more in depth tuning I have a spare 1970 40hp engine to use to rebuild or for parts (a spare set of 373 heads for example).
Thanks in advance! |
.. in the 1970s I had a 40hp motor. I put a 30 pict -1 carb off of a 1967 bug on my 40hp motor . it will give a little more power in has a high speed enrichment discharge tube it made a very street friendly motor much more fun to drive it pulled hills better . I ran a 019 disy. and formula vee exhaust tips in the stock muffler . keep the stock air cleaner it has a built in stack for fuel stand off . most guys take off the stock air cleaner only to have there bugs lose power at top end. to me this was the best carb to put on a single port motor . I for got the jetting I ran in that carb .40hp motors run and run and run . this worked for me good luck spencerfvee |
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Albertoprop17
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Joined: March 15, 2016
Posts: 196
Location: Valencia (Spain)
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| Posted: Fri Jan 03, 2020 8:39 am Post subject: Re: 28PCI on a 40hp engine and tuning. |
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I would build a 1385cc engine with 1300 heads (single port or dual port, that's your choice). There are single port intake curve castings already avaliable. Would use those with a cb performance hi flow center section with a 31 or 34 pict 3.
1.25:1 intakes 1.1:1 exhaust or a performance cam like engle 100 or cb 2280. If you decide to go dual carbs you can use a more agressive cam.
Good exhaust and ignition and you are ready to go. Strong powerful engine that will push much better than a stock 1.6 due to the added compression of the 1385cc kit.
Add more carburation with the stock intake manifold is a waste of time, money and gas
Also using 1300 heads gives you more flow and porting capability. Here in Europe dual port 1300 heads are often avaliable as used. Don't know in the states.
Hope this helps you.
Alberto
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'54 vintage speed beetle slow project
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SteveW
Samba Member
Joined: February 21, 2004
Posts: 176
Location: Nottinghamshire, UK
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| Posted: Fri Jan 03, 2020 3:40 pm Post subject: Re: 28PCI on a 40hp engine and tuning. |
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| Albertoprop17 wrote: |
I would build a 1385cc engine with 1300 heads (single port or dual port, that's your choice). There are single port intake curve castings already avaliable. Would use those with a cb performance hi flow center section with a 31 or 34 pict 3.
1.25:1 intakes 1.1:1 exhaust or a performance cam like engle 100 or cb 2280. If you decide to go dual carbs you can use a more agressive cam.
Good exhaust and ignition and you are ready to go. Strong powerful engine that will push much better than a stock 1.6 due to the added compression of the 1385cc kit.
Add more carburation with the stock intake manifold is a waste of time, money and gas
Also using 1300 heads gives you more flow and porting capability. Here in Europe dual port 1300 heads are often avaliable as used. Don't know in the states.
Hope this helps you.
Alberto |
I have entered a vintage VW rally in the stock class so at present my focus is on the current engine, whilst I have the spare engine I have other priorities I need to sort first before spending the time rebuilding that engine.
Ive read a few posts on here and I thought it would be fun to see what a mildly tuned 40hp would be like before I have the time and resources to dedicate to a full rebuild.
Thanks Spencer for your info 🙂
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Steve
1951 Type 1 11c - Chestnut Brown
1995 T3 - South African RHD Microbus / 2.6i |
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earthquake
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Joined: January 10, 2008
Posts: 3984
Location: SANDY VALLEY, NEVADA
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SteveW
Samba Member
Joined: February 21, 2004
Posts: 176
Location: Nottinghamshire, UK
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| Posted: Tue Jan 14, 2020 4:48 am Post subject: Re: 28PCI on a 40hp engine and tuning. |
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I love that choke delete bracket!
In my parts stash I found a 30 Pict 1 (VW 105-1) so Im going to have it modified for bronze spindle bushes and then Ill rebuild it. Will it be ok to just change the 12v choke and pilot jet valve to 6v items?
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Steve
1951 Type 1 11c - Chestnut Brown
1995 T3 - South African RHD Microbus / 2.6i |
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spencerfvee
Samba Member
Joined: August 19, 2004
Posts: 3071
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| Posted: Tue Jan 14, 2020 7:35 am Post subject: Re: 28PCI on a 40hp engine and tuning. |
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| SteveW wrote: |
I love that choke delete bracket!
In my parts stash I found a 30 Pict 1 (VW 105-1) so Im going to have it modified for bronze spindle bushes and then Ill rebuild it. Will it be ok to just
.change the 12v choke and pilot jet valve to 6v items? |
.I like what your doing your having fun .your not spending a lot of money .and your going to see how much more power you can make. to me that's fun .yea any one can spend money on a bigger motor. but some times a stock motor build is more fun good luck 40hp for ever .lol spencerfvee |
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SteveW
Samba Member
Joined: February 21, 2004
Posts: 176
Location: Nottinghamshire, UK
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| Posted: Tue Jan 14, 2020 8:17 am Post subject: Re: 28PCI on a 40hp engine and tuning. |
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| spencerfvee wrote: |
| SteveW wrote: |
I love that choke delete bracket!
In my parts stash I found a 30 Pict 1 (VW 105-1) so Im going to have it modified for bronze spindle bushes and then Ill rebuild it. Will it be ok to just
.change the 12v choke and pilot jet valve to 6v items? |
.I like what your doing your having fun .your not spending a lot of money .and your going to see how much more power you can make. to me that's fun .yea any one can spend money on a bigger motor. but some times a stock motor build is more fun good luck 40hp for ever .lol spencerfvee |
That's the plan! My last Beetle was a full race car with a 250hp engine built by Pat Downs and it was superb, but I didn't build it and I didn't refresh/rebuild it, I was reliant on others. This build is all about doing as much as I can possibly can myself and starting a from a stock engine with a single carb and working from there but keeping it old speed!
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Steve
1951 Type 1 11c - Chestnut Brown
1995 T3 - South African RHD Microbus / 2.6i |
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