| [ Total Views: 987 | Total Replies: 11 | Thread Id: 79570 ] |
|
|
 clinker42
Officially Full-On Dubber
Posts: 381
Threads: 154
Registered: August 19th, 2008
Member Is Offline
Theme: UltimaBB Pro Blue ( Default )
|
| posted on October 11th, 2009 at 05:38 PM |
|
|
Whats twin port
Guys
When you refer to TP, do you mean the cyl head as two ports, one for each cyl and a Single port only has one port which turns into two runners, one
feeding each cyl.
Thanks Trev
|
|
|
Anthiron
A.k.a.: Nicko McKay
Compulsive Aussie Vee Dubber
The Baja Rejuvenation Begins
Posts: 4936
Threads: 310
Registered: October 1st, 2003
Member Is Offline
Location: Buderim QLD
Theme: UltimaBB Pro Blue ( Default )
Mood: Hell hath no fury like a womans scorn for sega.
|
| posted on October 11th, 2009 at 05:40 PM |
|
|
yes you are correct
62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom
|
|
|
bajachris88
A.k.a.: Chris Leete
23 Windows of Awesome
The international telephone dialing code for Antarctica is 672.
Posts: 6661
Threads: 534
Registered: April 8th, 2005
Member Is Offline
Location: Tanah Merah, SE-QLD
Theme: UltimaBB Pro Blue ( Default )
Mood: A bee bit ma' bottom, now ma' bottom's big!
|
| posted on October 11th, 2009 at 05:41 PM |
|
|
yea u got the right idea. 
SP: one to two,
TP: two well... to two still...
(ô_!_/ô) (ô_!_/ô)
69' baja: kombi box, thing spindles, irs, disc front, type 3 rear drums, 2 inch lift kit, 31x10 rears.
New engine in process: 94mm p&bs, 74mm C/w chomol Crank, 35.5x39 SP heads, turbo. Wierd combo, hopeful torque monsta! |
|
|
Joel
Scirocco Rare
Now containing 100% E-Wang
Posts: 9368
Threads: 211
Registered: February 14th, 2006
Member Is Offline
Location: Northern Rivers NSW
Theme: UltimaBB Pro Purple
Mood: Tact Level 0.00
|
| posted on October 11th, 2009 at 07:13 PM |
|
|
| Error |
| Sorry, you must be a registered user in order to download attachments. |
|
|
|
|
1500S
Custom Title Time!
Posts: 1418
Threads: 73
Registered: March 28th, 2005
Member Is Offline
Location: Nth Richmond, N.S.W
Theme: UltimaBB Pro Blue ( Default )
|
| posted on October 11th, 2009 at 07:34 PM |
|
|
And why did VW go to twin port???
DH
|
|
|
clinker42
Officially Full-On Dubber
Posts: 381
Threads: 154
Registered: August 19th, 2008
Member Is Offline
Theme: UltimaBB Pro Blue ( Default )
|
| posted on October 12th, 2009 at 08:05 AM |
|
|
I presume for torque
Increasing runner length by having the two ports in the head and splitting the runner iin the manifold increase the individual cyl runner which in
turn increases torque
|
|
|
 Bizarre
Super Moderator
The artist formerly known as blue74l
Posts: 12780
Threads: 734
Registered: August 25th, 2002
Member Is Offline
Location: Abbotsford, Sydney
Theme: UltimaBB Pro Blue ( Default )
|
| posted on October 12th, 2009 at 08:56 AM |
|
|
Dont think so
Buss motors are usually single ports for torque
I reckon it is so we can bolt IDFs, IDA,s and DRLA on 
Futue te ipsum!!!
|
|
|
1500S
Custom Title Time!
Posts: 1418
Threads: 73
Registered: March 28th, 2005
Member Is Offline
Location: Nth Richmond, N.S.W
Theme: UltimaBB Pro Blue ( Default )
|
| posted on October 12th, 2009 at 09:52 AM |
|
|
| Quote: | Originally
posted by clinker42
I presume for torque
Increasing runner length by having the two ports in the head and splitting the runner iin the manifold increase the individual cyl runner which in
turn increases torque
|
To save all the brain strain and horse power and torque views, the only reason that VW had back then when the first dual port head was made was FUEL
INJECTION no doubt for polution control for the USA market!! They then made the carb manifolds for the rest of us with our less stringent needs of
the time.
There was no difference in the output of the single or dual port engines with the stock carbs from the factory. With this, I must add that I only
look at anything Type 3 but no doubt, the Type 1 and 2 engines with the single carb would have the same outcome with the stock carb.
DH
|
|
|
Carter
Seriously Crusin Dubber
Posts: 104
Threads: 12
Registered: October 2nd, 2008
Member Is Offline
Theme: UltimaBB Pro Blue ( Default )
|
| posted on October 13th, 2009 at 06:27 AM |
|
|
^ that's not what my Haynes manual says...
|
|
|
1500S
Custom Title Time!
Posts: 1418
Threads: 73
Registered: March 28th, 2005
Member Is Offline
Location: Nth Richmond, N.S.W
Theme: UltimaBB Pro Blue ( Default )
|
| posted on October 13th, 2009 at 06:57 AM |
|
|
| Quote: | Originally
posted by Carter
^ that's not what my Haynes manual says...
|
Then Mr Haynes mustn't have been around when the first fuel injected VW engine came on the market which incidently was the Type 3 1600 and from my
fading memory, the model year was 1968. The writeup of the day (VW Safer Motoring??) described how the heads had been re-engineered with 4
individual ports (two per head!!!) for the injection tubes to attach.
Back then we were all silly enough to think the engines would be much better with the heads on the carb models and changed them as soon as we could
get the heads as spares here. Result was, and as VW stated, no difference in HP or torque unless fitted with the electronic fuel injection which
suposedly gave a bit more torque but HP remained the same BUT resulting in better polution control.
DH
|
|
|
Matt Ryan
A.k.a.: Matt Ryan
Fahrvergnugen
Posts: 890
Threads: 107
Registered: January 6th, 2006
Member Is Offline
Location: Port Macquarie NSW
Theme: UltimaBB Pro Blue ( Default )
Mood: Fweemin
|
| posted on October 13th, 2009 at 09:01 AM |
|
|
Yes it was all about pollution control and hanging on to the American market then.
Can anyone remember when ADR27a came into force? The Aussie cars of the time ran soooo hot! You could literally smell the heat off them when they
rolled into the workshop!
Most of the manufacturers tried to achieve pollution control with tuning and kept engineering solutions to a minimum. They ran hotter plugs with
bigger gaps weird advance curves and very lean jets. Engineering solutions were pretty well limited to an egr valve and a charcoal canister. The 6
cylinder Holdens had so many overheating issues that within 6 months they started to factory fit them with V8 radiators. Even then they still ran
bloody hot.
VW did similar, starting with California models as Cali had the strictest laws earlier than anywhere else. (most of which we adopted for ADR27a)
It's the reason beetles got twin ports, the dog house oil cooler and vents in the deck lid. Then later, with further pollution tweaking making them
run hotter again they added an extra row of vents in the deck lid as well.
In Australia we were lucky because our pollution laws got stricter later so we got all the extra cooling with minimal heat adding tweaking. When
ADR27a finally came into force it virtually killed the beetle in Australia. By this time the Californians had gone even further with catalytic
converters etc. and had even stricter laws in planning.
VW realised that they would not be able to comply with future pollution laws without a major (and expensive) engine re-design. Beetle sales were
falling, Golf sales were picking up. In the end they let the Beetle die, played around with the flat engine and made it water cooled for the Kombi
then eventually they let the flat four engine die as well.
All this at a time when Subaru was at the very beginning of starting to go great guns with their flat four water cooled. It's all such a crying shame
really.
Regards,
Matt.
|
|
|
1500S
Custom Title Time!
Posts: 1418
Threads: 73
Registered: March 28th, 2005
Member Is Offline
Location: Nth Richmond, N.S.W
Theme: UltimaBB Pro Blue ( Default )
|
| posted on October 13th, 2009 at 10:16 AM |
|
|
Thanks for the added support re dual port reason Matt. Boy! Do I remember those red holden motors in the Commodore with no advance until top
gear!
Back to VW, maybe the best "sort of standard but breathed on" engine I had was still single port 1600 with a Bert Jones cam 18-58 running 8.5:1 CR
as was the 1500S engine (back in 1968!!). That is the setup of the present engine except the cam is standard now. The single port heads allow the
old bomb to sing along merrily at the motorway speed limit very reliably although that hasn't happened for a few years as I've been out of the
country each time Nambucca has been on. Just a pity that it's not on the odd year rather than the even! If anyone could get me some new 1500
barrels I'd even go back to a 1500 engine for it as I have a set of dome pistons here doing nothing!
Some of these manuals don't give us the real truth about things as well as someone "thinking" that is the reason for something and two relays down
the track it is an actual fact!! Very true on some of the Merkin forums.
DH
|
|
|
