Skip to content
Aussieveedubbers

What carbs are fitted to a 1776 Type 1 engine build

0 likes
Share Share on Facebook Share on X Share on Reddit
Log in to reply

helbus Administrator Mad fabricator, paint and body

7,386 posts · joined Sep 2002 ·

#1008532
What carbs are fitted to a 1776 Type 1 engine build. For street use only. Fuel economy is not an issue. Smooth torque required. Is there a matching cam and heater box exhaust different for either application?

Single Weber, or Twin Kadrons? Weber would have better syncronisation.

I Know both can be fitted, but what are the pro's or cons of each?
EJ22 into Bay Microbus - Finished project build thread- click on this spot here for info

fish26 Fahrvergnugen

903 posts · joined Jul 2007 ·

#1008535
36drla x 2
110 cam
stock valve heads, massaged
vintage speed heater box system
bitten by the bug..........several times

Bizarre Moderator The artist formerly known as blue74l

12,785 posts · joined Aug 2002 ·

#1008541
Above is my choice as well

Stock PICT works well

Not a fan of single Weber set up. Never seen one run smoothly. I had better luck with a progressive.

Never ran Kadroms

ANY dial carb setup needs a quality linkage to operate smoothly
Futue te ipsum!!!

matberry Moderator Go hard or go home

8,114 posts · joined Mar 2006 ·

#1008544
36 or 40 IDF Weber or Dell's
Exhaust 4-1 extractor or VS muffler, exact exhaust details depends on cam and head choice. A 1776 can deliver anything from 50ish to over 100hp at the wheels
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE

1303Steve Scirocco Rare

8,650 posts · joined Aug 2002 ·

#1008545
I fitted 40 dels to my sons 1904 (1776 with a 74 crank) they run extremely smooth, great economy if want it, btw 74 crank fits in with minimal work, just saying

empi Compulsive Aussie Vee Dubber

4,131 posts · joined Aug 2002 ·

#1008548
Vintage speed and 40mm IDFs
"If at first you don't succeed, skydiving is not for you." - Anonymous 🥷

psimitar Son of Jim - Creator of Good

2,506 posts · joined Jan 2009 ·

#1008576
a choke per engine cylinder is the best and the size doesn't matter as the majority of IDA, DRLA etc can be choked to fit the engine size to keep gas speed high. Anymore than 110 cam pushes the power away from low end pep.

If you want the best from the engine then flowing the heads is where the moneys at. Things like the CB 044 are pointless as they just rely on bigger valves n ports with no flowing work. For 1776 std valve sizes and flowed will beat a 044 IMO.

CSP python is the best exhaust out there for performance but the vintage speed is a nice option too.

I you're in QLD I suggest going to see Matt as he knows his stuff 🙂
madness is in the eye of the beholder 👍

fish26 Fahrvergnugen

903 posts · joined Jul 2007 ·

#1008607
Oh how wrong you are.......size matters
bitten by the bug..........several times

psimitar Son of Jim - Creator of Good

2,506 posts · joined Jan 2009 ·

#1008640
fish26 wrote:Oh how wrong you are.......size matters
To a point but my mate who's been tuning race cars for most his life and designs cams for Crow would say that for such a small engine good flowed std valve heads will give better gas speed and flow than a rough cast head with bigger valves 🙂
madness is in the eye of the beholder 👍

GASBNR Fahrvergnugen

894 posts · joined Jan 2003 ·

#1008641
I have Italian 48 IDA's for my berg cranked high revving 1776😂
SORRY BOUT THAT!

modnrod Fahrvergnugen

978 posts · joined Mar 2011 ·

#1008649
helbus wrote:What carbs are fitted to a 1776 Type 1 engine build.......... Smooth torque required. Is there a matching cam and .........?
The difference between a set of twin Weber IDF style carbs, and a stock 1600 TP manifold with a Solex 34PICT3 is about 10% or so. The more you want to rev the thing, it is possible that a stock Solex can be up to 20% down in power, but only when the revs go north of 6000-6500. It's your decision whether the expense is worth it for your application. Twin IDFs make more torque everywhere, but have 4 pilot jets (which are sensitive to dust, use good filters), 4 main jets, 4 emulsions, etc. Solex 34s aren't perfect by any means, but are stone-age simple and do the job fine, for a 1776 I would throw in a 28mm venturi and just drive it. You'd be surprised though, at just how little difference there is between the two under 3000. Same with exhausts, quite often non-merge systems can make more torque under 3500 than the almighty 4-1.

Cam specs are usually related to the rev range, but more importantly, the torque peak/curve, and what makes the difference is the overlap and duration.
If you run twin IDFs you can get away with more duration without the idle being affected much, but you will still lose torque on the bottom.
If you want peak torque around 3000, but also lots of torque under this mark (like if you have a Kombi, or if you are towing a trailer up hills all day), then keeping the cam close to CB "cheater" specs, or W100 or smaller will do fine, even a Web 218/119. If you have a Beetle, and you want to spin it up a bit to 6000 or so occasionally, W110 or Web163 or Web86B will make it rev a bit, but you will be down on torque at the wheels under 3000.

There you go! One more unsolicited opinion! 😂

zayus Wolfsburg Wizard

437 posts · joined Sep 2002 ·

#1008693
Bugspray carb
009 dizzy
S&S 1 &3/8 headers with aluminium silencers

That combo worked for me a long time ago on a single port 1500.

I don't build engines, but...

Twin Kads
Electronic dizzy
W110 cam
38 mm CSP exhaust
Ported heads 40/35
Stock valve train (not including valves)
Balancing & blue printing