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 wiseoldub
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| posted on February 19th, 2003 at 07:32 PM |
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webbers for a type 4 motor?
i've got a standard twin carb type 4 motor except for electric fuel pump and 009 dist, and would like to know what webbers carbs would be best
for a little more boost off the mark without sending my fuel bill to the moon! any ideas?
cheers josh
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 Bizarre
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| posted on February 20th, 2003 at 09:00 AM |
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IDF 36 of 40's.
A set off 44's would work well to - probabally cost a bit more.
It all really depends on the vents and jets.
40's are more common but the 36's hide in Alfa / Fiat wreckers and work as well.
"IF" you were going to big valve / jug it later the 44's would be the go.
Futue te ipsum!!!
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Phil74Camper
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| posted on February 20th, 2003 at 05:28 PM |
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If you just bolt big Weber carbs on the Kombi engine with no other changes, I would doubt that you get any improvement in performance at all.
Stock Kombi Type 4 engines are detuned, low-compression versions of the Type 4 sedan engine (never sold in Australia). They are designed as commercial
vehicle engines - very strong, very reliable, very low RPM engines.
They CAN give out more power and do make fabulous performance engines. The Porsche 914 uses the same basic engine, but in a highly tuned configuration
with different cam, heads, inlet and exhaust and various minor parts.
You would have to do the same with the Kombi engine to see any performance gain. Big carbs by themselves - nope.
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Menangler
A.k.a.: Dave Becker
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| posted on February 20th, 2003 at 07:02 PM |
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Josh, Phil is right, you may get a small gain in power if you fit some twin Webers (40 or 44 IDF, don't bother with 36's they are too small
for a 2ltr)
You would need to fit a fatter cam shaft and some good 1800 heads and a bit more comp, to make use of the bigger carbs. (Then go for a set if 44
IDF's)
The power gain will surprise you.
FAHRVERGNUGEN;
Description of a pleasurable sensation,
Experienced when a car and it's driver are in mutual harmony, A unique driving experience, Pleasure, Satisfaction,
A feeling experienced by Volkswagen Drivers.
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wiseoldub
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| posted on February 20th, 2003 at 08:08 PM |
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thanks guys! just a bit of food for thought at this stage!!!!
cheers josh
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Phil74Camper
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| posted on February 21st, 2003 at 09:21 AM |
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In fact I went the other way - I enlarged my Kombi engine to 2.4 litres, but still use the stock twin carbs. All the other components - heads, carbs,
exhaust etc - are still stock. The only changes I made were to enlarge the main jets and slightly reduce the air correction jets.
No more top end than stock, but put your foot down from idle and hang on! The stock carbs and manifolds pass more than enough air in the driving range
I use.
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wiseoldub
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| posted on February 21st, 2003 at 02:45 PM |
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sounds really nice!!! what did you use to get to 2.4? bigger cam?what was the cost? its definately something i will wait a while to do, but i just
can't seem to leave it alone! improve, improve , improve!!!!!
cheers josh
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wiseoldub
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| posted on February 21st, 2003 at 03:22 PM |
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i've also got an upright 1641 with mild cam and duel throat webber for my split and have recently been offered a set of 36' dellortos at a
good price with linkages! what is better? twin carb dellortos or duel throat webber?[is it true that 36 dellortos can be re-jetted to 40'?]
cheers josh
if the dellortos are better, then my duel throat webber will be for sale with linkages for around $600.
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Phil74Camper
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| posted on February 21st, 2003 at 04:35 PM |
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To get 2.4 litres (actually its about 2.36), I used a 71mm crank from a 2-litre Kombi (which has 5mm more stroke than a 1.7 or 1.8 Kombi), and 103mm
pistons and cylinders. I found mine second-hand, in never-used condition. The pistons are TRW, so I guess they were originally made for a Chevy or
something.
Both the heads and case need machining to make them fit. I also modified the rods to throw oil onto the piston undersides, as these large cylinders
can suffer warpage if they get hot. I also had to do a lot of checking and measuring and calculating to make sure the CR was correct (7.1:1 in my
case)
I think parts and machining came to a couple of grand by the time I finished. The WHOLE engine was at least that again, maybe more. I don't like
to add it all up, it gets a bit depressing!
But anyway, stock Kombi carbs are fine for Kombis. So long as they're in good condition of course. I can't help you with Dellortos - my old
Beetle had twin 40IDF Webers.
One other good thing about stock Kombi carbs over aftermarket ones - once you get them set up and adjusted, you can forget them for at least 6000km.
No tinkering with the mixtures, idles and linkages every weekend, like you do with Webers!
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wiseoldub
Fahrvergnugen
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| posted on February 22nd, 2003 at 09:52 AM |
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thanks phil, good to know you are out there!!! much obliged!
cheers josh
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