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.

[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