How square is your motor?

[BigglesPiP]

Not shape, bore to stroke ratio.

I have a bore of 82.00mm and a stroke of 75.65mm, so the ratio is 1.08 (bore divided by stroke).

Just want to see how many cars are past square.

Good source of specs.

 

[benjo]

81.00 mm / 77.40 mm

1.04 apparently

 

[Lashout_UK]

1500: 74mm x 88mm, 0.84

Corvette: 99mm x 93mm, 1.06

'other': 90.30mm × 78.00mm, 1.16

Thrilling thread

 

[James_N]

96.00 mm × 80.00 mm
3.78 in × 3.15 in

is that good or bad

 

[BigglesPiP]

96.00 mm × 80.00 mm
3.78 in × 3.15 in

is that good or bad

1.2, furthest past square so far.

Shorter stroke tents to be more revy with good power up high, and have less torque low down.

 

[ryder]

83mm Bore, 91mm Stroke. Ratio of 0.91.

No oversquare here.

1990 Supra 3.0 N/A

 

[moss]

106 GTi, 0.957

 

[acevuk]

Renault Scenic - 80/93 = 0.86

 

[Lashout_UK]

96.00 mm × 80.00 mm
3.78 in × 3.15 in

is that good or bad

http://en.wikipedia.org/wiki/Stroke_ratio

Knock yourself out

 

[MagicBoy]

0.83

 

[Biffa]

1400 Tdi
79.50 mm × 95.50 mm
3.13 in × 3.76 in
0.83

 

[[TW]Fox]

84x89.6mm.

So 0.9375.

Is that good, bad or what?

 

[MagicBoy]

1400 Tdi
79.50 mm × 95.50 mm
3.13 in × 3.76 in
0.83

Hmm, exactly the same as the 1.9.

/Goes looking for bodged welding on the block....

 

[BigglesPiP]

1400 Tdi
79.50 mm × 95.50 mm
3.13 in × 3.76 in
0.83

Diesel, needs to be a stroker to get the compression.

84x89.6mm.

So 0.9375.

Is that good, bad or what?

Good for the displacement, a lot of large versions of engines are well under-square. It's not so much good v. bad, as high power v. low torque.

 

[Iamzod]

Well, i've got one which is as follows-

86.00mm x 86.00mm = 1.00

And -

93.00mm x 68.50mm = 1.36

That one Oversquare enough for ya, lol?

 

[[TW]Fox]

I have a compression ratio of 10.2:1.

Wow!

 

[BigglesPiP]

93.00mm x 68.50mm = 1.36

That one Oversquare enough for ya, lol?

Oooof!

An F1 engine is about 2.5 btw.

 

[Begbie]

0.91

 

[Dave85]

Bore × stroke 93.00 mm × 84.00 mm
3.66 in × 3.31 in

Im confused lol

 

[Iamzod]

Bore × stroke 93.00 mm × 84.00 mm
3.66 in × 3.31 in

Im confused lol

93 Divided by 84 = 1.11, so that's oversquare.