ausmini :: View topic - Small bore performance parts

I'm interested in this too, particularly things like straight cut drops, I think I saw here recently someone had to use 1275 ones and have them bushed to fit.

sam_1100 got a set of Minisport UK SC 1275 drops, then bought a thicker front bush on the web from someone on the Isle of Man.
MED still does sell smallbore ones I think, but cost more $$$ than Minisport.

Hey PK

I don't have a list per say, but if they have a list I would happily look through a list if a website had it.

It's a potential build that would be a while off.

Just looking for things like conrods, maybe a fancy crank.

Mini1990's experience with S rods got me thinking:
Why pay to straighten and balance S rods when you can buy new, straight, and balanced ones for $600.

If the same holds true for small bore rods, maybe cranks etc I may aswell buy them up to build a motor.

adamstuart wrote:

Yeah sure mate,

The rods that Mini1990 had, were they std cooper s rods? (or even repro ones?)

You could get your current crank lightened, straightened and balanced cheaper than you could buy a fancy aftermarket crank. Saddly they're a bit on the dear side.

I don't know of anywhere that does aftermarket smallbore stuff (mostly because I've never looked) or else I'd post you a link.

Hi Adamstuart
I have small bore parts, special small bore extractors, small bore over size valves made to the MK S length so you can fit better valve springs, a range of pistons, i have just designed some new cams for the small bore motors have to do some more testing with these.
One thing to rember when fitting 1275 rods to a small bore you have to fit the rod to the piston through the bottom of the block, and some times you can not get the pin into the piston with out grinding some of the block away first fitting teflon buttons is a lot eazier than trying to fit circlips in.
Graham Russell

I skimed through this post a bit but what is the advantage of 1275 (S) rods in a small bore :?:

Kennomini wrote:

I skimed through this post a bit but what is the advantage of 1275 (S) rods in a small bore :?:

Stronger, but they are much heavier.

drmini in aust wrote:

Kennomini wrote:

I skimed through this post a bit but what is the advantage of 1275 (S) rods in a small bore :?:

Stronger, but they are much heavier.

In a well built engine, under what conditions are small bore rods likely to fail?

Author:	adamstuart [ Tue Oct 09, 2012 7:25 pm ]
Post subject:	Small bore performance parts
Just wondering if there are any websites out there that do fancy bits for small bore engines Cranks, light weight rods, etc etc Everywhere I have looked only do parts for 1275's Cheers

Author:	keastmini [ Tue Oct 09, 2012 7:35 pm ]
Post subject:
I'm interested in this too, particularly things like straight cut drops, I think I saw here recently someone had to use 1275 ones and have them bushed to fit.

Author:	drmini in aust [ Tue Oct 09, 2012 9:00 pm ]
Post subject:
keastmini wrote: I'm interested in this too, particularly things like straight cut drops, I think I saw here recently someone had to use 1275 ones and have them bushed to fit. sam_1100 got a set of Minisport UK SC 1275 drops, then bought a thicker front bush on the web from someone on the Isle of Man. MED still does sell smallbore ones I think, but cost more $$$ than Minisport.

Author:	Phat Kat [ Tue Oct 09, 2012 9:08 pm ]
Post subject:
Hi Adam, specifically what sort of parts were you after? Did you have a list?

Author:	keastmini [ Tue Oct 09, 2012 9:28 pm ]
Post subject:
drmini in aust wrote: sam_1100 got a set of Minisport UK SC 1275 drops, then bought a thicker front bush on the web from someone on the Isle of Man. MED still does sell smallbore ones I think, but cost more $$$ than Minisport. Cheers doc, I'll ask him for the details!

ausmini https://ausmini.com/forums/

Small bore performance parts https://ausmini.com/forums/viewtopic.php?f=5&t=78771	Page 1 of 3

Author:	adamstuart [ Tue Oct 09, 2012 9:31 pm ]
Post subject:
Hey PK I don't have a list per say, but if they have a list I would happily look through a list if a website had it. It's a potential build that would be a while off. Just looking for things like conrods, maybe a fancy crank. Mini1990's experience with S rods got me thinking: Why pay to straighten and balance S rods when you can buy new, straight, and balanced ones for $600. If the same holds true for small bore rods, maybe cranks etc I may aswell buy them up to build a motor.

Author:	Phat Kat [ Tue Oct 09, 2012 9:37 pm ]
Post subject:
adamstuart wrote: Hey PK I don't have a list per say, but if they have a list I would happily look through a list if a website had it. It's a potential build that would be a while off. Just looking for things like conrods, maybe a fancy crank. Mini1990's experience with S rods got me thinking: Why pay to straighten and balance S rods when you can buy new, straight, and balanced ones for $600. If the same holds true for small bore rods, maybe cranks etc I may aswell buy them up to build a motor. Yeah sure mate, The rods that Mini1990 had, were they std cooper s rods? (or even repro ones?) You could get your current crank lightened, straightened and balanced cheaper than you could buy a fancy aftermarket crank. Saddly they're a bit on the dear side. I don't know of anywhere that does aftermarket smallbore stuff (mostly because I've never looked) or else I'd post you a link.

Author:	adamstuart [ Tue Oct 09, 2012 9:40 pm ]
Post subject:
Phat Kat wrote: adamstuart wrote: Hey PK I don't have a list per say, but if they have a list I would happily look through a list if a website had it. It's a potential build that would be a while off. Just looking for things like conrods, maybe a fancy crank. Mini1990's experience with S rods got me thinking: Why pay to straighten and balance S rods when you can buy new, straight, and balanced ones for $600. If the same holds true for small bore rods, maybe cranks etc I may aswell buy them up to build a motor. Yeah sure mate, The rods that Mini1990 had, were they std cooper s rods? (or even repro ones?) You could get your current crank lightened, straightened and balanced cheaper than you could buy a fancy aftermarket crank. Saddly they're a bit on the dear side. I don't know of anywhere that does aftermarket smallbore stuff (mostly because I've never looked) or else I'd post you a link. Mini1990 was looking at getting his S rods worked on, but GR suggested he just get some new ones for the same price. Not sure much further than that. At least, thats what I remember hearing through the grapevine(forum) I'm not really going to build a screamer of a motor, but if the parts are out there, and I can collect them slowly over time, it's more likely to happen Cheers for your input though

Author:	GR [ Wed Oct 10, 2012 6:56 am ]
Post subject:
Hi Adamstuart I have small bore parts, special small bore extractors, small bore over size valves made to the MK S length so you can fit better valve springs, a range of pistons, i have just designed some new cams for the small bore motors have to do some more testing with these. One thing to rember when fitting 1275 rods to a small bore you have to fit the rod to the piston through the bottom of the block, and some times you can not get the pin into the piston with out grinding some of the block away first fitting teflon buttons is a lot eazier than trying to fit circlips in. Graham Russell

Author:	adamstuart [ Wed Oct 10, 2012 6:20 pm ]
Post subject:
GR wrote: Hi Adamstuart I have small bore parts, special small bore extractors, small bore over size valves made to the MK S length so you can fit better valve springs, a range of pistons, i have just designed some new cams for the small bore motors have to do some more testing with these. One thing to rember when fitting 1275 rods to a small bore you have to fit the rod to the piston through the bottom of the block, and some times you can not get the pin into the piston with out grinding some of the block away first fitting teflon buttons is a lot eazier than trying to fit circlips in. Graham Russell Cheers Graham. I might get Ivan to have a chat to you about these small bore cams and see about getting some off you to build up a motor

Author:	Kennomini [ Wed Oct 10, 2012 6:27 pm ]
Post subject:
I skimed through this post a bit but what is the advantage of 1275 (S) rods in a small bore

Author:	drmini in aust [ Wed Oct 10, 2012 7:50 pm ]
Post subject:
Kennomini wrote: I skimed through this post a bit but what is the advantage of 1275 (S) rods in a small bore Stronger, but they are much heavier. The rods Graham has are aftermarket light race rods for a 1275. Can be fitted to a smallbore with some mods, but GR is right re fitting the piston on. The rods' big ends won't fit down the small bores...

Author:	Kennomini [ Thu Oct 11, 2012 6:19 pm ]
Post subject:
drmini in aust wrote: Kennomini wrote: I skimed through this post a bit but what is the advantage of 1275 (S) rods in a small bore Stronger, but they are much heavier. In a well built engine, under what conditions are small bore rods likely to fail?

Author:	drmini in aust [ Thu Oct 11, 2012 7:28 pm ]
Post subject:
Kennomini wrote: drmini in aust wrote: Kennomini wrote: I skimed through this post a bit but what is the advantage of 1275 (S) rods in a small bore Stronger, but they are much heavier. In a well built engine, under what conditions are small bore rods likely to fail? They are NOT, in a road engine. Modified Cooper S rods were used in Mini Miglia racers in the UK with `Miglia' pistons (these had S size gudgeon pins) due to the very high RPM they had to do to be competitive. It's mentioned in Vizard's book...

Author:	Slo998 [ Sat Oct 13, 2012 7:30 pm ]
Post subject:
Swiftune do some really nice parts for small bores. They are not the cheapest place around, but I've used lots of there stuff and can't fault any of it. Can't say the same for some of the other OS suppliers! I'm using there drop gears for a 998. http://www.swiftune.com/Product/475/swi ... -1041.aspx They have 998 con rods that are porn! http://www.swiftune.com/Product/757/swi ... s-998.aspx Std ones will be fine thought, just do the normal things of polishing, shot peening, balancing, lighten if your really keen and I doubt you will be able to kill them My 998 build is getting very close to running again, should be a good test of how strong small bores can be. Or be a catastrophic fail Nathan.

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