Inductioin choices on stock 1600 dp

[ccowx]

I am curious if there is likely any value to an upgraded induction set up on a basically stock engine.

The engine:

-AE code 1600 dp engine, stock cam, heads, valve train, etc.
-1-3/8" header with QP muffler, properly set up for manifold heat.
-Bosch SVDA distributor with functioning vac advance and slightly faster timing.
-Free flowing air cleaner, with proper stand off.

Induction choices:

A) CB super stock intake center section and a Solex 34-3 with a 28.5mm venturi. Re-jetted of course!

B) Stock Solex 34-3 with richer main jet and stock DP intake.

The car is a 70 Beetle and will be used as a second/third vehicle while my kid is home for the summer.

What do you think, go stock or try for a few more horses? Not sure if the stock cam will limit it anyway and I am just looking to lose mileage. The engine is just a convenience, it has an 1835 out for freshening up and going back in later this summer.

Thanks!

Chris

[madmike]

Twin 40 IDF's
_________________
'Black Ice'Drag Buggy 'Turbo'
Rail Buggy 1915 turbo
76 Drag/Street bug 2180cc 'Turbo' 11:85 @113 mph"If I go any faster I'll burn up the Hamster" ,gets 28 mpg. also 10/09/22 11.90 @115 mph
"If I'm ever on Life Support,UNPLUG Me, Then Plug me back In see if that Works"

[oprn]

That would work in July and August, the rest of the year they would be a pain in the butt! Hard starting and jet changes as the weather got cold.
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We had the stone age, the bronze age, the industrial age and now we are in the age of mass deception and mind control for corporate profit. (The mass media age)

[Alstrup]

A) CB super stock intake center section and a Solex 34-3 with a 27 to 27,5mm venturi. Re-jetted of course!
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https://www.thesamba.com/vw/forum/viewtopic.php?t=435993

[gorbur]

I fiddled with your choice "B" for a season on my stock 73 Ghia. Cold temps were the issue. Jetting could get it close but not consistent in the range of -10C to 30C. As oprn says a pain. Tried different thermostats etc as well. Personally wouldn't do the faster timing.
Ended up switching to 2x 34 ICT's. Worked great for 5 years. No issues in temps either. Slight performance increase and fuel economy stayed the same.
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73 - Ghia Cabriolet, currently under resto
76 - Type1, 1776, full restomod

[ccowx]

It seems that there is some sort of recurring comments about cold weather operations. Jetting a bit richer in winter is not uncommon and fair enough. Are you saying that if it's rich enough to start easily then it ends up rich at running temperature?

As for the timing, what I meant is that the rate of advance has been made faster. it is now 25 degrees at 3000 rpms. Initial will be around 7 deg BTDC and total around 32. What would be the problem with that?

If anyone remembers some of my earlier posts, cold weather operations are a priority for me. Given where I live that is not unreasonable. However, this engine is probably only going to be used for a few months this summer, so not an issue in the short term.

As always, thanks for the input! This is basically what I call a "sweep the garage floor" engine build. The beetle has an 1835 with a few upgrades that will be freshened up and put back in later this summer. This is just an engine to keep it on the road for a few months while it's REAL engine is getting worked on.

Thanks!

Chris

[oprn]

I was referring to the twin Webers. Off the shelf Webers today do not give satisfactory year around drivability. If you are just looking to get it running for a couple summer months that is different.

And yes if your mixture is fat enough to start easily and run well cold it will be too rich once warmed up.
_________________
We had the stone age, the bronze age, the industrial age and now we are in the age of mass deception and mind control for corporate profit. (The mass media age)

[Alstrup]

I must admit that it took me roughly 20 years to figure it out. On the other hand it was not a top priority. VW themselves were pretty close. But I AM kinda amazed that so few northenerns know how to improve the cold start apart from installing oil heaters and the likes.
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https://www.thesamba.com/vw/forum/viewtopic.php?t=435993

[madmike]

I live on the Polar Equator for crying out loud, I have no issues in cold weather with my 40 Idf's on my bus , just have to warm it up before you take off( 'U Hosers" SNL Guy's) but I do park it in winter because of road salt
_________________
'Black Ice'Drag Buggy 'Turbo'
Rail Buggy 1915 turbo
76 Drag/Street bug 2180cc 'Turbo' 11:85 @113 mph"If I go any faster I'll burn up the Hamster" ,gets 28 mpg. also 10/09/22 11.90 @115 mph
"If I'm ever on Life Support,UNPLUG Me, Then Plug me back In see if that Works"

[jpaull]

Thats the key, where you live determines idfs needing rejetting or help. Not everyone lives in cold climates. Winter in some areas juat means you gotta give it 2 pumps of gas before starting.

I like Alstrups choice though. Keep the choke and simple system.

[oprn]

Mike, you live in the banana belt, don't deny it!

Ccowx is a long, long way north of you yet! In fact he is a long way north of me too. I know, I was up there once for my sister's wedding. It's so far north that I was allowed to sing at the reception and it did not create an international incident!

Could have though now that I think of it. Russia is closer than the USA was...
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We had the stone age, the bronze age, the industrial age and now we are in the age of mass deception and mind control for corporate profit. (The mass media age)

[oprn]

[jpaull]

[Brian]

[Dusty1]

[oprn]

The VW dealers here always sold and installed the 120 V oil pan heater on new cars. It was just a normal part of the pre-delivery service. They worked like a charm too. We always added a battery blanket. With the two plugged in you were good to go right down past -40.

The problem I always had and am still having with the electric automatic chokes is that if you set them for say -15* then they did not choke enough for -30. If you set it for -30 then it would choke for far too long at -15. They were always a compromise but still far better than the nothing we get today on aftermarket carbs.

I love my cable operated manual chokes on my old Webers! I get to set them for best action for every start!
_________________
We had the stone age, the bronze age, the industrial age and now we are in the age of mass deception and mind control for corporate profit. (The mass media age)

[richparker]

Now, I only live in the southwest in the southern most chain of the Rocky Mountains at 8000’. It snows and get cold, but not as cold as Buffalo. I can honestly say that I have zero issues starting my engine with IDF40s in the winter. Now, I do use a Kats VW-15 sump heater, which I guess would be similar to a cast iron skillet full of coals. There is also zero issues driving in cold temps.
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’71 Westy build
Adventure thread
’65 Deluxe Build
’63 Deluxe Build

[Brian]

[richparker]

[txoval]

If you have to drive a classic VW in -15 or -30 weather I feel really bad for you 🥶