11 replies to this topic

[apbellamy]

Right then.. Can somebody help sort out an argument between me and my mate??

I've got an old A series engine that has been overboard to 73.5mm (standard stroke). We both have different ideas about what over all CC this will give me. I say 1380, he says 1360.

In his argument, he says that CC is worked out on the size of the piston rather than the size of the bore. However, I think it is done on the size of the bore.

Also does the dish in the piston count towards the overall CC? My pistons have a 5cc (ish) dish in them.

When I bought the engine it was described as a 1400, but then they could have been as optomistic as I am!

When I checked on the internet, the maths to work out the CC is something like (((2 x Pie)x 73.5) x Depth) x 4. The disk is worked out something like (((2 x Pie)x 73.5) x Depth) /3 (mmm Pie ).

Thanks

Andy

[Pie]

Right then.. Can somebody help sort out an argument between me and my mate??

I've got an old A series engine that has been overboard to 73.5mm (standard stroke). We both have different ideas about what over all CC this will give me. I say 1380, he says 1360.

In his argument, he says that CC is worked out on the size of the piston rather than the size of the bore. However, I think it is done on the size of the bore.

Also does the dish in the piston count towards the overall CC? My pistons have a 5cc (ish) dish in them.

When I bought the engine it was described as a 1400, but then they could have been as optomistic as I am!

When I checked on the internet, the maths to work out the CC is something like (((2 x Pie)x 73.5) x Depth) x 4. The disk is worked out something like (((2 x Pie)x 73.5) x Depth) /3 (mmm Pie ).

Thanks

Andy

Seeing as you mentioned my name so many times ill tell you.

73.5 overbore is a 1380.

It will be classed as a 1400 (some insureance companies will say 1400 not 1380)

[BJst416]

http://www.theminifo...?showtopic=8736

Search option is a wonderful thing...

[mini_turbo_pete]

On a standard stroke 73.5mm pistons are 1380cc.

CC is worked out on swept volume not on bore volume. so it won't matter how many cc's the pistons are the swept volume is still the same.

[mk3 Cooper S]

Right then.. Can somebody help sort out an argument between me and my mate??

I've got an old A series engine that has been overboard to 73.5mm (standard stroke). We both have different ideas about what over all CC this will give me. I say 1380, he says 1360.

In his argument, he says that CC is worked out on the size of the piston rather than the size of the bore. However, I think it is done on the size of the bore.

Also does the dish in the piston count towards the overall CC? My pistons have a 5cc (ish) dish in them.

When I bought the engine it was described as a 1400, but then they could have been as optomistic as I am!

When I checked on the internet, the maths to work out the CC is something like (((2 x Pie)x 73.5) x Depth) x 4. The disk is worked out something like (((2 x Pie)x 73.5) x Depth) /3 (mmm Pie ).

Thanks

Andy

Seeing as you mentioned my name so many times ill tell you.

73.5 overbore is a 1380.

It will be classed as a 1400 (some insureance companies will say 1400 not 1380)

Do people really tell state larger than 1275 to the insurance companies?
It's either a 1275 Cooper (genuine) or it's a modified mini - right ?

[mini_turbo_pete]

Right then.. Can somebody help sort out an argument between me and my mate??

I've got an old A series engine that has been overboard to 73.5mm (standard stroke). We both have different ideas about what over all CC this will give me. I say 1380, he says 1360.

In his argument, he says that CC is worked out on the size of the piston rather than the size of the bore. However, I think it is done on the size of the bore.

Also does the dish in the piston count towards the overall CC? My pistons have a 5cc (ish) dish in them.

When I bought the engine it was described as a 1400, but then they could have been as optomistic as I am!

When I checked on the internet, the maths to work out the CC is something like (((2 x Pie)x 73.5) x Depth) x 4. The disk is worked out something like (((2 x Pie)x 73.5) x Depth) /3 (mmm Pie ).

Thanks

Andy

Seeing as you mentioned my name so many times ill tell you.

73.5 overbore is a 1380.

It will be classed as a 1400 (some insureance companies will say 1400 not 1380)

upto 1349cc insurance companies will see it as a 1300cc engine, over 1350cc insurance companies will see it as a 1400cc engine

[mini_turbo_pete]

Right then.. Can somebody help sort out an argument between me and my mate??

I've got an old A series engine that has been overboard to 73.5mm (standard stroke). We both have different ideas about what over all CC this will give me. I say 1380, he says 1360.

In his argument, he says that CC is worked out on the size of the piston rather than the size of the bore. However, I think it is done on the size of the bore.

Also does the dish in the piston count towards the overall CC? My pistons have a 5cc (ish) dish in them.

When I bought the engine it was described as a 1400, but then they could have been as optomistic as I am!

When I checked on the internet, the maths to work out the CC is something like (((2 x Pie)x 73.5) x Depth) x 4. The disk is worked out something like (((2 x Pie)x 73.5) x Depth) /3 (mmm Pie ).

Thanks

Andy

Seeing as you mentioned my name so many times ill tell you.

73.5 overbore is a 1380.

It will be classed as a 1400 (some insureance companies will say 1400 not 1380)

Do people really tell state larger than 1275 to the insurance companies?
It's either a 1275 Cooper (genuine) or it's a modified mini - right ?

If it's a standard overbore size then you don't need to declare it to your insurance company, for a mini the biggest standard overbore is +0.060" which is 1330cc

[mk3 Cooper S]

Right then.. Can somebody help sort out an argument between me and my mate??

I've got an old A series engine that has been overboard to 73.5mm (standard stroke). We both have different ideas about what over all CC this will give me. I say 1380, he says 1360.

In his argument, he says that CC is worked out on the size of the piston rather than the size of the bore. However, I think it is done on the size of the bore.

Also does the dish in the piston count towards the overall CC? My pistons have a 5cc (ish) dish in them.

When I bought the engine it was described as a 1400, but then they could have been as optomistic as I am!

When I checked on the internet, the maths to work out the CC is something like (((2 x Pie)x 73.5) x Depth) x 4. The disk is worked out something like (((2 x Pie)x 73.5) x Depth) /3 (mmm Pie ).

Thanks

Andy

Seeing as you mentioned my name so many times ill tell you.

73.5 overbore is a 1380.

It will be classed as a 1400 (some insureance companies will say 1400 not 1380)

upto 1349cc insurance companies will see it as a 1300cc engine, over 1350cc insurance companies will see it as a 1400cc engine

Interesting - Mine just falls in the "modified" 1275 category. Make no difference to my insurance company if it is a 1293 or 1480!!

[apbellamy]

http://www.theminifo...?showtopic=8736

Search option is a wonderful thing...

I searched on 1380, so missed that....

[mini_turbo_pete]

Right then.. Can somebody help sort out an argument between me and my mate??

I've got an old A series engine that has been overboard to 73.5mm (standard stroke). We both have different ideas about what over all CC this will give me. I say 1380, he says 1360.

In his argument, he says that CC is worked out on the size of the piston rather than the size of the bore. However, I think it is done on the size of the bore.

Also does the dish in the piston count towards the overall CC? My pistons have a 5cc (ish) dish in them.

When I bought the engine it was described as a 1400, but then they could have been as optomistic as I am!

When I checked on the internet, the maths to work out the CC is something like (((2 x Pie)x 73.5) x Depth) x 4. The disk is worked out something like (((2 x Pie)x 73.5) x Depth) /3 (mmm Pie ).

Thanks

Andy

Seeing as you mentioned my name so many times ill tell you.

73.5 overbore is a 1380.

It will be classed as a 1400 (some insureance companies will say 1400 not 1380)

upto 1349cc insurance companies will see it as a 1300cc engine, over 1350cc insurance companies will see it as a 1400cc engine

Interesting - Mine just falls in the "modified" 1275 category. Make no difference to my insurance company if it is a 1293 or 1480!!

I depends on who the broker/insurance company and the type of policy you have as to weather they charge you extra or not.

[apbellamy]

On a standard stroke 73.5mm pistons are 1380cc.

CC is worked out on swept volume not on bore volume. so it won't matter how many cc's the pistons are the swept volume is still the same.

Take me as thick... are you saying it's piston diameter then rather than bore diameter?

[Pie]

If it's a standard overbore size then you don't need to declare it to your insurance company, for a mini the biggest standard overbore is +0.060" which is 1330cc

upto +0.060" is still technically classed as a "rebore", whereas 1380 is an overbore

***Just so i sound technical, as i know that lol ***