1776 dual 44 idf setup

[Lowlightmafia]

Hi, I am looking for base set up advise

I have a 1776 that killed a lifter and I’m going to rebuild it but this time with 9.5:1 comp or more if I can still use 91 octane, Engle fk8 cam, 1.4:1 rockers. Heads currently have larger valves I can’t remember but they are larger than stock, the heads will be ported and upgraded with higher rev springs. Also running German 009 distributor, 4 tuned header 1 1/2" (I have a 1 5/8" header if needed for more flow), 4 tuned dual quiet packs, type 4 oil cooler, full flow filter and auxiliary oil cooler. Driving will primarily take place in Los angles elevation with occasional Angeles crest elevation.

I have a set of 44 idfs with the single roller on lever and they currently have F7s emulsions tubes, 155 mains, original airs with no markings (I am hoping they are 200), no idle jets, and 36 mm venturis.

I want to be able to have power thought the rev range, not sluggish in the beginning and not starving for air at the end. I am not sure if the 36 mm venturis are exactly what I need or if a set of CB 34 mm venturis will be good for the larger valves + fk8 cam + 1.4:1 rockers + 1 1/2" header.

I dont really know much about emulsion tubes but will the F7s be good or should I just buy F11s

open to suggestions for the rest of the jetting and which header I should use.

I will be buying the 1.4:1 rockers soon but the reason is, I haven't found or heard of a reliable brand that makes 1.5:1 rockers for around 160$+-. if any one knows of a good brand and the cost let me know please.

Thank you for your help in advance

[Dan Ruddock]

On my engine, CB 1.4 rockers gave me 1.47 ratio.


Dan

[Vanillagurilla]

With a decent head like panchitos or Tim's stage 1 should make around 135hp 115ftlbs at 10-10.5:1 and will run on 91. It will be a higher rpm with that cam, peak torque wont come in till 5k and peak hp at 7k.

[[email protected]]

If you’re looking for a 1776 that’s not sluggish in the bottom end, an FK-8, and 44’s with 36 vents aren’t exactly what I would choose. Finding out what size valves you have may help a little. You could maybe get away with the carbs, but I’d look into a smaller cam. I had the cookie cutter 1776 with a 110, and 40’s, and it pulled from about 1500-5500. I switched the cam to a Crower 61004, and it pulled from 900-6500. I have an FK-10 in a 2276, and you can definitely feel the cam start working around 2000 rpm. The stroke of the engine moves the car before that, so it has no sluggishness below 2000. A 1776 isn’t going to be able to do that.

[Lowlightmafia]

[Lowlightmafia]

[[email protected]]

You’re going to have to choose your driving style, and what you want out of the engine. To get any engine to make power at 7000 rpm, you’ll need a fairly elaborate set of heads, and a big enough cam to allow them to breathe. The second version of my 1776 made peak torque at 3400. I don’t think you’re going to make up in the bottom end with smaller vents what you’ll be loosing with the size of the cam. The 2276 with much larger heads, and the FK-10 is probably making more torque at 2000 rpm than the 1776 is at 3500 rpm. That’s fine if you’re not expecting the FK-8 to “come on” in your 1776 below 2000 rpms, but I would imagine the engine would be flat at anything less than 3000. Don’t take what you find on the internet as gospel, myself included. I’d let the engine builder have the final say.

[Alstrup]

[Lowlightmafia]

[Lowlightmafia]

Chico knows his stuff. BUT, the FK8 does´nt pay for more than about 10-1 static. Been there done that.
Stay with the 1½" header for better lower rpm power. I´t´ll cost you a couple of hp up top, so be it.
135 hp in a good set up is absolutely possible.
T[/quote]


I have the cam from a 2161 build I didn’t use and I’m ok with high rpm driving, it’s more fun for me in the canyons. I will stick to the 1 1/2 exhaust. I was aiming for 100 + hp with this setup from the start, so I’m glad other people think I will hit my mark.

[mark tucker]

I ran 11:1 on premium for a bit with fk8&1.5 rockers then down to 10.5 on 93 with no issues on my 1874 cc. with duel 44's but they were jetted a little rich for cooling and lots of chamber work...so.. I would stick around 10:1 and make sure your springs are not coil binding. most of the time if you get a lot more lift that the cam says ... the rockers are too high and need to be lowered. and yes on a 1776 a 1.5 header would probably work best unless your only after high rpm power. I had a 1 5/8" on mine. a little soggy on the low rpm 3rd&4th but not real bad. tire size and trans ratios also come into play there as well as timing curve and jetting.

[Lowlightmafia]

carb choice update.

I have purchased a set of 32/36 Berg venturis to test out and see if they will give me some low rpm torque without sacrificing high RPM performance. I will look into buying a set of F11 emulsion tubes, when we get the engine built and test it out on the dyno.

exhaust update.

I'v decided to stick with the 1 1/2" 4 tuned header.

New question update.

I am now looking online to source the best set of manifolds for the job. I have read intake length + diameter = volume and this should match the displacement. Does anyone have any ideas if this is true or if I should just skip the arithmetic. I'v also heard tall = torque down low and short = hp up high. open to suggestions.

[Alstrup]

I´m sure they will. From what I have seen the F7´s seem to work best with those venturies in IDF´s. But there can be variations to the subject.
T

[Lowlightmafia]

So I bought a set of 6.5 to 7 inch tall idf manifolds. They were un-ported and selling for a cheap price so thought why not.

[vugbug68]

[67rustavenger]

Maybe I missed it.
What vehicle is this 1776 going to propel?

If it's a beetle. Those manifolds will likely cause the air cleaners to come into contact with the side of the engine compartment and the decklid.

I tried the same style manifolds on my 67 beetle last year. Within a few hundred miles(maybe, the engine failed in short order) the contact points made grooves in my aluminum filter, top covers.

Good Luck.
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[Lowlightmafia]

[Lowlightmafia]

[Lowlightmafia]

Heads are 40 35, case was unusable and going with an as42 Mexico case I had in the garage. Going to upgrade to forged pistons.

[Multi69s]

Those carbs are to big for your engine, unless you're looking for all top end only. If you want an engine that has power now, especially coming out of a corner, 40s would have been a far better choice. I would probably look at a vent size of 28 and tune from there.
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