What Size Flat 4s are out there?, What are the common sizes and what are you driving? Options

[7TPorsh]

Curious how the Flat 4 population is spread out and how we all refer to our cars/engines. If you had to "label" your car

I have a 1.7 block that's been bumped a little...I was told to 1.9 ...but still think of my car as a 1.7. I will be putting on 1.7 badge soon.

If you bumped your 1.x to a 2 liter; do you say you have, a 2 liter? or your 2 liter to 2.x....still a 2 liter?

Flat 4 only please; sorry 6ers and Subies.

[Bob L.]

It's not the original 1.7 that came stock in '73 (or the 1.8 bus motor that I got with the car) but a stock 2.0 from a '76.

[Mueller]

3 motors for 1 car!

Non-runner 1.7 on side of the house.

Rebuilt 1.7 runner in the garage.

Sort of running bus 2.0 in the 914.

[Dave_Darling]

Badges don't mean s**t. (IMG:style_emoticons/default/wink.gif)

Mine is a 1971cc motor, because that's what came in the car to start with. That's the stock 2.0 displacement. (The 1.7 is 1679cc, the 1.8 is 1975cc.)

Popular sizes include:
1911cc (96mm bore, 1.7/1.8 66mm stroke)
2056cc (96mm bore, 2.0 71mm stroke)

From there, costs go up significantly. The 103mm cast-iron cylinders don't seem to be super reliable, and the 105s even less so. You have to cut the case and heads for them as well.

2200cc (103mm bore, 66mm stroke)
2286cc (105mm x 66mm)
2367cc (103mm x 71mm)
2459cc (105 x 71)

Going much larger than 71mm stroke requires some significant work, such as going to a reduced base-circle cam, and lots of double- and triple-checking of clearances, and some careful work with a grinder. Usually if someone is going to do that much work they're not doing it for just a little more stroke. 78mm is a popular one, and Raby has used 78.4mm in the past. I believe that LN makes Nickies in a 102mm size, which can be rather more reliable than the cast-iron cylinders (at a higher cost).

2258cc (96 x 78)
2270cc (96 x 78.4)
2549cc (102 x 78)
2563cc (102 x 78.4)

We have seen some people running 80mm cranks in their engines. Quite frankly, I'm not sure how they can, but it has been done!!

2614cc (102 x 80)
2771cc (105 x 80)

And finally, there has been at least one three-liter motor built. I don't know the dimensions, but you can be sure that it was a stupefying amount of work to get it all to fit, and almost certainly horrifyingly expensive.

--DD

[Olympic 914]

Think you need a 2056 choice.

1 vote for that.

Mine started out as a 1.7

[Montreal914]

Definitely need to add 2056 as a choice, as this is a popular combo.

I enjoy it... until I build something else.

[MrHyde]

I'm running a 80mm crank. Needed some extra " clearance work " on the case but it works just fine. I run a 2316cc. Plenty of power to get me in trouble :-)

[Mark Henry]

Not in my 914 but I have 2.6L in my '67 bug, it has a 911-901 with stock 914 gearing. I'd say it goes pretty good, my summer daily driver.
The basic details are in my signature.

It was suppose to go into my 914, but plans change and I wanted more HP (IMG:style_emoticons/default/biggrin.gif)

I wonder where MrHyde got his crank (IMG:style_emoticons/default/wink.gif)

[DBCooper]

Never mind.

[campbellcj]

I had a pretty decent carbed/cammed/headered 2.4 (2367) for a while. It was nicely tractable and torquey. Then I went to a six for track durability and top-end power.

[7TPorsh]

So with all these variations, how many different cases are there?

I think i have learned that the 1.7 and 2.0 cases are different?

Can a 2056 be done on a 1.7 case? How big can it go using the same case and heads?

[Kansas 914]

My '74 is 2143cc = 74mm stroke crankshaft, and 96mm pistons and cylinders

[BeatNavy]

Can a 2056 be done on a 1.7 case? How big can it go using the same case and heads?

Yes. It's more about the heads than the case, but you can even use the 1.7L heads for a 2056. Jake Raby prefers to use 1.7 cases for his builds for several reasons. THIS POST from a few years ago is chock full of good info on this subject.

[Dave_Darling]

The only difference between the cases of the various 914s were the serial numbers. And the early 1.7s did not have the bosses cast in for the windage tray in the sump.

The openings for the cylinders were the same size, the main bearing saddles were the same, everything was the same.

Some of the VW applications were different; they opened up the boss on the front (914 orientation) of the case for an oil filler tube with a dipstick in it. And some of those had solid metal where the 914 oil filler goes. But that was really about it.

--DD

[EdwardBlume]

I've enjoyed the 2056 in Dads car. Don't expect a neck ache but enough to pep to feel like you're strapped to the front of the hood. (IMG:style_emoticons/default/biggrin.gif)

[era vulgaris]

I've enjoyed the 2056 in Dads car. Don't expect a neck ache but enough to pep to feel like you're strapped to the front of the hood. (IMG:style_emoticons/default/biggrin.gif)

You should try a 2270. I FINALLY got all the kinks with my Dells worked out, and now I can't keep my foot out of the gas pedal. It's like being strapped into a roller coaster powered by screaming ogres! (IMG:style_emoticons/default/aktion035.gif)
I suspect though that my credit card bill might be a bit higher due to gas station stops this month (IMG:style_emoticons/default/driving.gif)