5 replies to this topic

[adam_93rio]

Got some cranks and blocks bought as a job lot. One of the blocks has a 10h engine number.

I have some cranks but I'm trying to figure out which is for the 1098, the rest will be 998 (I think)

Did the 1098 cranks have a different stroke? If so, what's the best way to measure?

Also, are the rods/Pistons the same as a 998?

[ACDodd]

Look for the number on the crank, 12g82.

Ac

[ukcooper]

nicked this from some where , don't know if its any help.

Crankshaft info

22A62 850cc - Early type with oil feed for primary gear, 1.375" dia. tail
22A63 850cc - Early type with oil feed for primary gear, 1.375" dia. tail
22A298850cc - Early type thin-nose crank, 1.375" dia. tail
12A670 850cc - Later type with 1.5" dia. tail
12A298 997cc - Original Cooper crank
12A375 997cc - Cooper crank with oil feed hole for primary gear
12A595 998cc - Early EN16T spec
12A1451 998cc - Later, pre-A+ EN16T spec
BHM1436 998cc - A+ spec, 1985 onwards (12A1451 forging)
12G82 1100cc - Standard across the board transverse A-series EN16T spec
AEG330 970cc - EN40B forged, non-cross drilled
AEG171 1071cc - EN40B forged, non-cross drilled
AEG315 1275cc - Cooper S, EN40B forging, Nitrided, 1.625" dia. big ends, non-cross drilled
AEG316 1275cc - Cooper S, EN40B forging, Nitrided, 1.625" dia. big ends, non-cross drilled
AEG479 1275cc - Cooper S, EN40B forging, Nitrided, 1.625" dia. big ends, cross drilled
AEG480 1275cc - Cooper S, EN40B forging, Nitrided, 1.625" dia. big ends, cross drilled
AEG623 1275cc - Cooper S, EN16T forging, Tuftrided, 1.625" dia. big ends
12G1287 1275cc - Non-S, EN16T with 1.625" dia. big ends
12G1288 1275cc - Non-S, EN16T with 1.625" dia. big ends
12G1505 1275cc - Non-S, EN16T with 1.75" dia. big ends
12G1683 1275cc - 12G1505 forging, non-S, EN16T with 1.75" dia. big ends, Tuftrided
CAM6232* 1275cc - Rolled-fillet radius on bearing journals, A+ with 1.75" dia. big ends

The turbo is CAM 6581

[Spider]

If the Forging Number is hard to see / read measure between centres of the big ends, there's well enough difference between these and the 998 that you'll easily pick it up with a ruler.

 

998 Stroke is 3.00"

1100 Stroke is 3.30"

 

Another way is if you look at the crank pins. The 998 Cranks, the crank pins just 'overlap' the Mains, where as on the 1100 they don't.

 

The 998 Rods that have a floating pin can readily be used on the 1100.

[adam_93rio]

Looks like I didn't have a 1098 crank with it

Is it just the crank that differs then? The rods are the same

[timmy850]

Crank and pistons are different.