1776 c25 cam cab help

[guystclair]

I just had a 1776 single port engine built with a German forged crank and a c25 scat cam installed running a stock pic 30 carb and stock exhaust. any suggestions or recommendations to make it run good, the last engine that was in it was a 1600sp now with a broken crank....oh yeah, it's a 1970 hitop bus.
Please no smart ass comments about getting rid of the bus please.
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1969 bug

[GTV]

Get rid of the stock carb and exhaust.

Not a smart ass comment.
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EMPI Power Rules!

[guystclair]

what would you suggest? are there any options other then dual carbs?... not a big fan of them, yeah I know i should of thought of that before building the engine
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1969 bug

[Danwvw]

That is a really mild cam and it should be OK with the stock carb and exhaust but it would rev easer if you replaced the exhaust system with a 1 3/8" Header. Usually people run the Engle W-100 cam when doing a pretty stock set-up, It has more lift than the Scat C25 camshaft.
But yeah. After having done it I would agree. Dual Carbs really wake a stockish engine up. Consider 1.25 Ratio Rockers! And I guess since it's a single port the Dual ICT carbs on a pare of single port manifolds is about all you can do for it. I had a 67 beetle with a single port 1585cc engine and the W-100 cam and it really would move that little bug around nicely. I tried several different carbs and settled for a PICT 28 40 horse Solex carb as it got the best gas milage and had good torque. But I tried a single Solex PBIC 32 Porsche early 356 carb normally used in pairs on it and "Wow" it really came alive even with the stock manifold. Had to plug the air correction Jet though to get it rich enough.
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1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

[bugguy1967]

Idle will always be rough with that carb. It should have dual 2 barrels and an exhaust to match.

Why aren't you a fan of duals? I know from experience that if you tune them right, with a GOOD high-end linkage like a CSP bellcrank or JKM bellcrank and quality filters, you'll set them once and forget them.

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[gt1953]

You said:
"I just had a 1776 single port engine built with a German forged crank and a c25 scat cam installed"
So honestly I do not think you want to tear the motor back down to change out the cam.
So Dual single barrel carbs, 1.25 ratio rockers, and some sorta exhaust. Those can be done without removing the engine or disassembly of it.
It will wake it up and have the low end you need on the hi top bus.
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72 Squareback
({59 Euro bug, 62, 63, 67, 68, 69, 73 type ones 68 & 69 type two, 68 Ghia all sold})

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30 years ago I rebuilt my dad's 71' bus engine with a C25 and everything else stock, it ran very well. It did improve when we put a 4-1 and single QP on it though.

Just remember to never EVER use the aluminum retainers that come in the "Cam Kits".
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[Alstrup]

I also disagree on the combo not working as such. It can run quite OK, if a few things are taken into consideration.

1. Carburetion. - I was never a fan of the 30 pict, unless it sat on a 13 or 1500 engine at the most. A progressive carb - can - work well. But in a bus, and on a sgl. port,... not an easy task, and there are other parts involved which makes the conversion less interesting. If you want to stay with a stockish carburetion, here is one way of doing it, which work well. I have done it several times on similar combo´s:
Buy a set of Empi sgl port end castings, and also the CB/Empi stock carb center section (or find a good used one from a stock dual port 1600. Also get a good 34 mm PICT carb. Get the venturi machined out to 28 mm (or buy one from John C. He may even be able to get all the parts fro you) Grind and massage the end castings to fit (It´s an Empi part )
Somewhat dependant on CR a.o. things you should begin with this jetting: 55 idle, 140- 150 IAC. (Some carbs already have 140. So be aware) Z60 or Z80 max E tube, and 140 main jet.
Use a 205 SVDA distributor from a 1600 dual port bus engine code AD & AS. I forgot the suffix on the distributor.

If your stock muffler is a JP Group (Dansk) its not worth a damn for anythin gelse than stock 1600 at the most. Hate to say it, but that´s the way it is. If it is a Leistritz or Ernst, you can get by. So, yes, a 1 3/8" header will be a good cheap choice.
Or this one http://www.ahnendorp.com/VW-Kaefer-Typ-1-Motorente...uff-1.html This one is way more silent than the Vintage counterpart, and delivers at least the same power/torque increase, often better. But its not shiny, I know.

Installing 1,25 rockers can be a good thing to aid in a better filling of the cylinder. BUT ONLY ON THE INTAKE!! The duration and lift on the exhaust is plenty on a sgl port. So adding lift to the exhaust will only create an overscavenging issue and will make you loose torque below approx 2800 rpm. along with lesser fuel efficiency.

Heavily dependant on heads and CR. this can give you power in the window of 68 - 75 hp and 145 Nm torque +/- about 5%.
This will also, and actually more important, make the engine a good deal more driveable, because of a wider powerband.

Hope this helps.

T

[guystclair]

wow! lots of information to study on Thanks for all your input! will look into carbs and exhaust to start.
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1969 bug