CR and other tips on rebuilding 1641 Type3 engine

[hanhoo]

I'm currently rebuilding the engine of my VW Type 3 notchback. It used to be a stock 1600 with addition of a 4-1 exhaust and dual 34ICT carbs, and produced 70bhp at 4100 and 130nm of torque at 2700rpm, with a CR of 7.8:1. Not bad, but it was all finished at 4000rpm. After 44 years the pistons, rings and cilinders have gone and at closer inspection it was time for preventative overhaul.

I hope you can all help me with some tips. I've stocked up the following parts list for the build:

Stock engine case
Stock crankshaft but balanced with flywheel and fan/pulley
1641CC Mahle pistons/cilinders
Stock 1600cc heads, lapped and flowed
Engl. W110 camshaft
Scat lifters
Stock rockers and pushrods
Bugpack 4-1 header with glass pipe muffler
Dual Weber 34ICT single choke carbs

In Holland we run 95RON fuel which is equivalent to 91 octane in the US. I'm puzzling on the CR. I'm thinking of 9:1, but is that too much or not?

Any other tips are more than welcome. Also on the exhaust side, because the one now is really actually WAY-TOO-LOUD! I'd like to have a performance exhaust with kind of a stock look.

Thanks.

[VWporscheGT3]

your better off sticking with 85.5 p/c's the gain from 87's is so miniscule that you could easily gain that and more with just the right cam selection. save yourself the trouble and go with stock bore.

But I do realize that if you already have the parts and are dead set on it there is not much I can say that will sway you from using them
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[hanhoo]

Sorry, the box is already sitting here with the 87's. Was able to get a good deal on them.

[GTV]

Use a smaller cam, similar to the Engle 100, or use dual two barrel carbs (42 DCNF's) with the 110. Compression no higher than 8.5:1 (type 3's don't cool as well). If you can afford it, use a counterweighted crank and lightened flywheel. All else looks good.
What exhaust are you using now?
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[fastfil]

I would discourage using the w110 with a stock crank. The only way to keep the wide VW gears in the powerband when you shift with that cam is to rev past 5k. Your centre main bearing saddles don't like that. Get a counterweighted crank or less cam.

Also if you use the w110, use a bolt on kit with your rockers. I ran the stock rocker setup with that cam and 2000km later it had me searching the side of the road for a stick to pop my rocker cover and some wire to hold my rocker on. Would have been the only time the buggy has left me stranded, except for running out of fuel (I used to have no gauge ).

What speed do you drive this vehicle at? It important to know if the guys here are going to suggest a cam. I realise speeds over your way can be different to the speeds we are used to here and in the US. High speed freeway driving is a game changer and I can see why the w110 could be a popular choice with setups like yours. If the car was for my roads (110kph limit) I'd use a milder cam (with lower CR). But if a higher top speed was most important, I'd go with the bigger cam and more compression.
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[hanhoo]

Thanks for your replies.

I've got suggestions from two renowned specialists over here to go for the W110 because the W100 doesn't do anything much over stock (as they say). That's also where I got a CR advice of 9:1 or 9,2:1 from. I'm however not sure about this.

Highway speeds in Holland vary between 100kph to 130kph. I usually do not run my air-cooled cars over 110 kph set aside the odd overtaking.

I chose the W110 because in Holland we usually drive from corner to corner and traffic light to junction, braking and accelerating along the way. Not hundreds of kilometers at an end in a straight line. The old engine was not rev happy and was out of puff at 4000+ rpm. I'd like a little more revs for the fun in driving. It's not a daily driver.

I'm taking your suggestions into consideration about switching to a W100. But with a W110, am I somewhere in the ballpark with 9,2:1? They say it might fetch around 85-90 horses that way with decent torque maxing at around 3300rpm.

EDIT: you really think I would drop dead if not shifting above 5000rpm? In my scene the W110 is considered a mild cam...

[[email protected]]

IMO the W100 is a better choice, given the stock crank and dual 1bbls.
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[hanhoo]

Maybe i'll save the W110 for my 1776 in the type2. That setup will get two Weber 40IDF's.

You really got me thinking it over here you all...

EDIT: So switch over to a W100 and keep the CR around 8,5:1, right?

[W1K1]

I had a W110 in my 1600cc single port (some port work), Dual PDSIT solex, 8.5:1,
I drove it for 2 years and didn't like it in my squareback.
It started to wake up at 3000 rpm which left a small powerband on a daily driver with single springs.

Switched to a 1904cc 74x90.5 with 36 dells, l3 heads, web 163, 8.5:1 and it's a much better daily driver, pulls hard from idle to 4500rpm. Most of the time it is using half throttle to get up to speed with traffic, and its getting 27 mpg.
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[fastfil]

There are some more modern options around. CB makes a range of milder cams for 1.1 rockers. Web Camshafts make some good cams too.
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"...swingaxle...transaxle...same diff."

[midtravelmidengine]

In my opinion the 100 is too small and the 110 is just a tad too big. Web cams has a cam right inbetween those...
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[hanhoo]

Hi Everyone, thanks for all the responses. I just got my internal parts blueprinted and I'm ready to start working on the heads. Time to choose the cam for once and for all.

I got a local dealer advise me a CB Eagle 2280 (Cheatercam). They say it's remarkable for a just above stock cam, it idles great and gives good torque from idle to all the way up to 5200rpm. They say it's a better choice over the W100 because I would get a more balanced result. Webcams are difficult to get by here, so no option.

What are your opinions? I plan to run it with a CR of 8,2:1 en 1:1.1 rockers.

Just to remind you: i'm running 87mm bore, 34ICT single choke carbs, 123ignition and probably a Vintagespeed type 3 stainless exhaust.

[Rome]

Have you considered the Sebring exhaust? On this site, go down to "Sebring"- Plus the shipping would probably be much cheaper than getting the Vintage Speed... http://www.gwd-weiser.de/?page_id=219

Oh- wait- I'm sorry- you have a Type 3; the Sebring is for type 1- my mistake.

[mcmscott]

The 2280 is a great cam, but you will not like it. It is done at 4500. I have one in my thing, asperated it pulls like a tractor, turbo'ed it pulls harder, 'till 4500.
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[clonebug]

I have a W-100 in my 1679cc turbo and it pulls hard all the way up to my self imposed 5200 rpm limit.
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