SA 1100 Cranks.
Turbo Mini Forums

On 5th Sep, 2009 Sprocket said:
Class A at Avon, with 9500rpm big bore and a 16v head

Yes i moved to the darkside

Instagram @jdm_brett

I'll have some of that action me thinks.

1: Paul H
2: Brett
3: cooper17
4: Sprocket
5: miniboo

Got a time scale? thanks

Sam

Hi guys sorry for only replying now but ive had a hectic weekend.

Ok these cranks are a short stroke 1100 version only made in SA. They are all good second hand ones.

As for fitment, we use them with a normal A series block decked about 5 or 6 mm and 1275 pistons. They have normal A journal sizes so they can be stroked using S rods.

The reason they arent used that much here is because we havent been able to get 1100 pistons(taller deck height) from about '74 or so and it is often cheaper to find a good 1275 crank instead of decking the block and changing the push rods.

But for racing and performance wise they are a very good choice.

As for a time scale it kind of depends on how many people are interested but im planning to have them airfreighted so they should arrive within a week of me sending them.

Dan

Edited by pinkyandnobrain on 6th Sep, 2009.

"So wat we gonna do tonight Brain?"
"Same thing we do evernight Pinky!"
"Try to take over the world!"

For the UK guys - FYI

I'm Sure Rich Hawcroft from Mini Spares North in Harrogate still has some of these short stroke cranks in his shed.....

Last time i checked he (along with Mark Forster from MK1-performance converisons) had imported nearly 100 of these cranks.

Sean - Durban - South Africa.

Check out the South African Mini Forum

www.atfreeforum.com/kznmini

1: Paul H
2: Brett
3: cooper17
4: Sprocket
5: miniboo
6. danw

So what is the exact stroke of these cranks?

70.2 mm

Just confirmed with Mark Froster - He and Rich (from Mini spares north) still have 15 of our SA cranks in stock - in Harogate, Yorkshire!

Check out the South African Mini Forum

www.atfreeforum.com/kznmini

1: Paul H
2: Brett
3: cooper17
4: Sprocket
5: miniboo
6: danw
7:1972-Angus ( if a nice person in uk could take shipment for me, and send on with Paul H for example....please please)

Yes i moved to the darkside

Instagram @jdm_brett

1: Paul H
2: Brett
3: cooper17
4: Sprocket
5: Joey

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

Joey, edit your post!! you are 8th in line!!

1: Paul H
2: Brett
3: cooper17
4: Sprocket
5: miniboo
6: danw
7:1972-Angus ( if a nice person in uk could take shipment for me, and send on with Paul H for example....please please)
8: joey

sorry, on tramadol atm ha

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

shite! im gunna mis this due to current lack of funds, could you pm me a price of a crank outside of this deal please buddy?

Ok, silly question maybe, what would I have to do/use to make this crank less than 1000cc?

I.e do i need longer rods, taller pistons or what?

Chris

Froster? nice. This was my secret supply, now everyone knows!

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

Right, I've just done some calculations, with a skimmed head (say 18cc chambers) and assuming a 6cc dish in a piston, you would need 7mm taking off the block to achieve around 8.8:1 CR (good for 15psi boost).

Can this be done to an A+ block? is it a good idea? are my calculations right?

How much are longer rods?

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

I will have the final 2. Just a couple of questions first,

What Kinda RPM can these go to safely?

How would I make less than 1000cc

on a std bore big block, to get below 1000cc you would need a much shorter stroke.

about 63.7mm, so you would need to more the journal centreline inward by about 3.21mm

i havent got jounal sizes to hand, so cannot say wether this crank could be destroked this far using s rods? anyone?

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

So could I not use longer rods? (custom made if nessasary)

No changing the length of the rods will have no effect on the engine cc, just the compression ratio.

To change engine cc, you need to change the bore or the stroke, nothing else will affect it.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

Ok so I have got to have the crank reground by 3.21mm and then a set of rods made with that size journal?

Yes, but you wont be able to take that much off the crank IMO.

Best would be to get a linered block and put undersized liners in with some suitable pistons. Well that's what I'd do.

although in reality what I'd do is buy a 970 crank and bore the block to 73.5mm, then you have 999 iirc.

Although in actual reality I'd use a 998 block and crank, especially for a turbo.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

Yes that what i wanted a 970 crank! .. but I cant get one anywhere!