What carbs are fitted to a 1776 Type 1 engine build
helbus - February 16th, 2015 at 10:05 PM
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?
fish26 - February 16th, 2015 at 10:44 PM
36drla x 2
110 cam
stock valve heads, massaged
vintage speed heater box system
Bizarre - February 17th, 2015 at 06:54 AM
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
matberry - February 17th, 2015 at 08:37 AM
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
1303Steve - February 17th, 2015 at 09:04 AM
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 - February 17th, 2015 at 09:37 AM
Vintage speed and 40mm IDFs
psimitar - February 17th, 2015 at 11:20 PM
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 
fish26 - February 18th, 2015 at 07:04 PM
Oh how wrong you are.......size matters
psimitar - February 19th, 2015 at 06:07 PM
| Quote: |
Originally
posted by fish26
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
GASBNR - February 19th, 2015 at 06:24 PM
I have Italian 48 IDA's for my berg cranked high revving 1776
modnrod - February 19th, 2015 at 10:12 PM
| Quote: |
Originally
posted by helbus
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 - February 20th, 2015 at 09:22 PM
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