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timmy201 wrote:

gr4h4m wrote:I run a SA crank, bored plus 40, using calver pistons and a set of longer H beam rods with the correct size for the crank journal, to save chopping the block. I used Williams rods, the bloke peddling them is not far down the road in north wales. He was very good to deal with. I met a mini 7 racer that runs them to 9600. My cars rev limiter is current set at 8300, it gets there very quickly and makes great power.
The engine tuned out better that I thought it would, it’s fantastic and I love it.

Thanks Graham, what cam are you using out of interest? Good to hear you like this style of engine

Edit: I’ve remembered I’d already read about your engine build on turbo minis and you had a supercharger. I’ll have a read up to see how you went

Yes I cheat a bit and run an sc12 kit from Ben92 (Aus mini).
I use the re13t cam on 112lca but that is more about the fact I’m using the supercharger.

I was worried about sinking the cash into the engine and box and putting it all together myself, that was the main reason I didn’t want to chop the block. As crazy as it sounds it was a budget build, not that my account felt like it at the time. I tried to keep it simple not that it ends up like that. I was concerned it wouldn’t feel much different that my 1060. My uncle had a 1071 in a van when I was a kid and to me it had a cult status. So I was worried the real thing was going to be a let down, it made about 18 bhp more but man what a difference the car is now, it lived up to my expectations!

Thanks Graham. I have the same thought about going from a long stroke 1100 to a short stroke 1100, but I'm hoping it'll be completely different to drive a a lot of fun

The crank was finished today at the machine shop. It measured up at 70.0mm stroke, I've found an old post from Rich saying this was one of the factory sizes they made.

Thought I'd add in some photos here as there isn't much happening at the moment. It came up as 10/10, which was great news.


I like the comparison between the SA1100 crank and the normal 1098 crank. The 1098 has no overlap between the main and big ends, the SA crank is much beefier! I picked up some really nice A+ rods, they still even had the standard size factory pistons and big end bearings

What is the par number of these SA1100 cranks, are they stamped/have markings ?

Thanks
Luis

It's 12G2827

12G2827

Thanks Tim!

Nice seeing a detailed thread on the SA 1100 cranks.

I remember when I could pick them up for R50 each.

Sean1380 wrote: ↑Tue May 26, 2020 9:43 am Nice seeing a detailed thread on the SA 1100 cranks.

I remember when I could pick them up for R50 each.

I was lucky enough to get this one - shipping took 3 months from SA to Australia!

Here's an interesting comparison photo from the SA mini forum showing the big top pistons fitted to the 1100
http://samini.co.za/showthread.php?tid=73

Blimey, the 1100 pistons are hideous

Do you use the standard length cylinder head studs?

pic from SA1100 crank with 8 port cam and A+Rods with ARP bolts

this is cylinder 4 and the clearance is round about 2mm.

all other rods have more clearance

Cheers
Faxe