| [ Total Views: 11064 | Total Replies: 14 | Thread Id: 83115 ] |
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 Paulc1964au
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| posted on April 14th, 2010 at 04:49 PM |
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Difference between a 1600 single port and twin port motor
Can someone explain what the differences are between a 1600 single and twin port motor?
I tried to explain today but made a meal out of it lol, does the twin port have more valves etc?
Thanks in advance
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Joel
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| posted on April 14th, 2010 at 05:00 PM |
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Its just in the intake manifold and head design
this might help
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Sides
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| posted on April 14th, 2010 at 05:08 PM |
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Twin port has a different carby too I'm pretty sure.
Question... does a single port 1600 have a dual-relief case ???
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ryana89
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| posted on April 14th, 2010 at 07:31 PM |
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Quite simple
From 2443TT's amazing drag bug thread
A Dual/Twin Port head
And a Single Port head
Im not sure if this is the best explanation but I'll give it a go.
A Dual/Twin port head has a port (or tube) for each intake valve (the 2 valves in the centre, not the out side) and a manifold like in the thrid image
across that Joel posted.
A Single port head has only one smaller intake tube/port that 'splits' in 2 for the two middle valves, inside the head.
That first picture (dual port head) from 2443TT's thread is of a very very well modified head, not stock at all (But still works exactly the same)
Hope I didn't confuse you
Cheers!
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68AutoBug
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| posted on April 15th, 2010 at 12:01 AM |
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| Quote: | Originally
posted by Sides
Twin port has a different carby too I'm pretty sure.
Question... does a single port 1600 have a dual-relief case ???
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Probably Not...??
Single port VW engines... all the early engines were single port. they were made with restricted breathing so they couldn't over rev....
until approx 1971 VW models with twin port 1600 engines..
VW Germany also made 1300 twin port engines mainly for Europe and the UK..
"Normal" twin port engines have two round holes for the two inlets...
Lee
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Paulc1964au
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| posted on April 15th, 2010 at 07:17 AM |
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So a twin port allows better fuel flow to the engine? so what carby would be better suited for a twin port, i think mine just has a standard solex
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Phil74Camper
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| posted on April 15th, 2010 at 12:20 PM |
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All air-cooled Volkswagen engines have only eight valves - four intakes and four exhaust valves, one each for each cylinder. There were no
'multivalve' VW heads (until the Golf came along...)
All engines up to 1971, as Lee said, were single port - that is, the 1200, 1300, 1500 and 1600. All had single relief valve cases. The Beetle only
used the 1200, 1300 and 1500 engines; the single port 1600 was only used on the Type 3 and the Kombi.
In 1971 the 1600 twin port engine was released, with a twin pressure relief valve case. It was designed for the US market, which had stricter smog
laws than the rest of the world. The engine was designed to run leaner and hotter to reduce lower emissions. This engine was used in the Superbug,
Type 3 range and the Transporter. Shortly after, a twin-port version of the 1300 engine was also introduced, for the same reasons. These were sold in
Australia in the 1300 torsion bar Beetle from 1971 to 1975.
In stock form, a twin-port head only flows marginally more than a single port - remember that stock VW engines aren't designed to rev over 4500 rpm
or so. The twin port head does, however, have more scope for performance improvements.
All VW 1200, 1300, 1500 and 1600 engines had single Solex carburettors fitted - only the model type was different. The 1600 twin port engine came with
a single 34 PICT/3 carb.
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Joel
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| posted on April 15th, 2010 at 01:23 PM |
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generally it was pict3 carbs that came on twin ports
ie. 31pict3 on 1300tp and 34pict3 on 1600tp
and single ports had earlier ones like the 30pict1/2 etc
but carbys are usually the first thing that get swapped over the years
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Paulc1964au
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| posted on April 15th, 2010 at 04:29 PM |
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According to Mick Waldron my car currently has a standard 1300 carby, guess I should try and source a 34 PICT/3
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jacky_moo
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| posted on April 16th, 2010 at 02:22 PM |
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| Quote: | Originally
posted by Paulc1964au
According to Mick Waldron my car currently has a standard 1300 carby, guess I should try and source a 34 PICT/3
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good luck!!
they are proving hard to find... and ive found that if your running a 009 dizzy you will get a nasty flat spot
*thanks joel  *
schnell!! schnell!! schnell!! schnell!!
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Phil74Camper
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| posted on April 16th, 2010 at 03:34 PM |
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You use a stock distributor with a stock carburettor - 009s are for non-vacuum signal carbs.
Shouldn't be too hard to find a 34PICT/3 as all the 1600 TP engines came with them. Most VW workshops should have boxes of them lying around. Try
ringing Boris at Vintage, for a start - he has shelves groaning with boxes of wrecking parts. I also reckon Mosche at Bug Parts Punchbowl has dozens
of old filthy ones lying around his workshop...
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Paulc1964au
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| posted on April 17th, 2010 at 08:31 AM |
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Ok I checked out the carby and it is a 30PCT, as you can see in the photos an adaptor plate has been fitted to the manifold.
Question is how much performance am I losing with this carby and should I replace it with a 34 as suggested?
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 Bizarre
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| posted on April 17th, 2010 at 02:42 PM |
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you are loosing bugger performance
Many people "upgrade" to a 30PICT
It is a "simpler" carb that works better in many ways
Futue te ipsum!!!
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Joel
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| posted on April 17th, 2010 at 06:29 PM |
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x2
that carb will be alot less finicky than a 34pict3
ive got a spare 1600tp with a 31pict3 carb and the only time i noticed any difference was nailing it when its already at 2500rpm or more, the 34pict3
picks up the pace abit quicker
that carb you have now looks like it needs some attention though
the float gaskets leaking by the looks and the idle screw is almost wound all the way in which means the progression circuit cant do its job
properly
probably just needs a good clean out and a new kit put through it
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Paulc1964au
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| posted on April 17th, 2010 at 06:44 PM |
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thanks Joel will take a look and will add it too the list of jobs 
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