Largest single port engine

[ppp]

Is there a limit to the size a single port can be? Without some tricked out heads or intake. Keeping it real and inexpensive...maybe?

[nsracing]

"tricked out" can never go w/ inexpensive.

It will always cost money or time or both to do anymore than stock. But I think in the end, it is all worth it.

[krusher]

[Gary]

Really? That's interesting, Keith. It's been my understanding that the limit for a SP was 1600, after which any larger would necessitate going to dual port status. I'm completely ignoring 1641 as I consider that unimpressive.

What kind of port work and other mods would have to be done in order to go 1776 with a single port?
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[EverettB]

I don't know the gritty details but I know there have been several people with 1776cc single port engines in Buses.
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[loor]

any size can be done but as krusher said - pointless. even with stock dp heads its pointless to expect power cuz you cant even fill the barrels fast enough

some guy in germany drives around with a 1966cc engin with bored 36mm solex pci carbs and sp heads and has got 110hp


so it can be done but with much effort and maybe if you cant do it yourself - plenty of money

just some impressions how its gotta look like if you want that a hipo engine may breath

good luck.

[Unkl Ian]

Try running 5k, not easy if you are out of shape;
now do it breathing through a straw. Possible, but much harder.



The factory had the right idea.

[Thornton]

[krusher]

[slo356]

Physically, you can built a Single Port head engine as large as any other head choice (dual Port). The real limit to useable increases in engine size is the availability of fuel/air mixture getting to the combustion chamber. Single Port heads are pretty restrictive in terms flowing big fuel/air mixtures. Also restrictive are available manifold / carburetor choices. When was the last time you saw, even on custom made manifolds, dual 48 Webers on a Single Port head engine? I believe the practical limit for Single Port engines is 1776 and should be done only to increase torque performance numbers. Small valves, small runners, taller intake manifolds and small carburetion sizes coupled with larger displacement will improve engine torque.

A 1776cc engine with Single Port heads, dual 28 to 34 mm carburetors on tall manifolds, a high torque cam (sometimes called a RV cams by engine builders), a torque tuned header/collector and an efficient ignition system should be a great engine for around town or endless hours on the highway. BTW, terrible at the drag strip.

Most driving needs torque not horsepower, which is why some people love diesel power.
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'65 T1 Sedan
'87 T3 Syncro

[TomSimon]

[Jimmy111]

You can build a 2332 if you want to.
I saw a 2180 that was dynoed at 157HP 5 years ago. and 5800 RPM
Of course the crappy intake has got to go.

[peoplesvw]

[Spezialist]

You could get away with a bunch of cc's if you had really trick dual manifolds made
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[bvilletom]

I have been building single port VWs for 4 years now in the 36 HP challenge and have a whole new respect for them. You can make a single port really breathe; it takes very detailed port work and hand fabricated tapered intake manifolds, and fairly large single barrel carbs. If the manifold works right it will actually make the flow numbers at the valve increase from just the head alone. It's all about velocity on the flow bench. If you flow an entire intake system air cleaner, through intake valve, it becomes a very interesting study.

Bville Tom
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bvilletom
36hp Challenge record holder New Age 126.236mph

1970 Porsche 914/6 – 2 liter LSR record holder
1992 Metro Sedan – 1 liter LSR records
1987 Chevy Turbo Sprint – under construction