Ahhh so you finally decided to supercharge one eh, and it's well suited too with it being such a low comp engine
54 out of a one liter is very good IMO my 1275 only has 45 @ 4500rpm give me that donk any day .

_________________
Respect mine and I'll respect yours.

Good for you matt. I am keen, as you know, to see how this thing works out. And see how reliable it is(bar the thrashing your giving it)

Cheers
Aaron

_________________

you busted me again kenno,,, how do you do that? have you hidden a secret spy camera in in my shed or something???

yes we are supercharging one for Stewy, he`s bought one of those new Eaton blowers off the New Bini "S"s & he`s conned me into setting it up for him,, it`s a right pain in the ar$e if you ask me,,, why can`t he just turbo it like we have for crickeys sake??? !!!!!!!! Now i have to make up another whole series of manifolds & brackets & crap for a super charged version

Aaron,,, if this little 998 8V holds up to my thrashing then it`s going to hold up to anyones thrashing besides, this little 998 is just that---> a "little" small bore,,, read it again--> Just a little small bore mini donk

Stewys is going supercharged 1293cc & he wants "HEAPS" of overdriven boost, he`s really the mad one around here

Archies Bimmer Twinky is 1275 & he just wants the quad motor-bike carbs like this small bore has

Garys twinky is 1415cc stroker & he hasn`t decided to turbo or not yet

Ians Twinky Moke donk is almost ready & is Turbo Injected 1330cc

& of course the Blue Moke we have been working on for ages is 1360 turbo injected & has been running for quite a few years

& then,,, of course...----> There are My own 3x Twinkies being a whole `nother ball game all together

sooooo,,,, Just for those that havn`t really understood all of whats been happening here... some of you are obviously a little confused lately, by all the PMs & e-mails i`ve been getting basically "Miss-Quoting" what has been written on this & other forums... please read the above list of our current Twinkys

There isn`t just one,,, there`s quite a few,,, & the one that cracked the pistons from the over-advance issue was the blue moke with the 1360 turbo injected engine, it`s been running for literally years & years & we`ve been playing with all sorts of R&D with it... the small bores we have done 3x of them,,, 3x different ways just to find out which way was best,,, all that work wasn`t for me at all,,, (I don`t really like small bores if you havn`t already noticed) ---> I did it for all the other people who have contacted me over the years to see if it can be done to a small bore & also asked what sort of power is avaliable

well,,, now we have shown that you can simply "Chuck" a std 2nd hand 8v Bimmer head ontop of a half baked 2nd-hand piece of sh!t 998 donk & make 54Hp at the wheels without even much of a tune, running lean as sh!t,,, we will (of course) set it up further (as i`ve already suggested) & make it happen a fair bit better... but all this takes time & it`s not my first priority,,, i do have quite a few other normal mini customers to attend to for a living

I am (However) really keen to see 8000+rpms (once tuned) from this particular small bore Twinky & hope to get at least 65Hp,,, maybe more,,, (if it doesn`t go POP) & for those who can understand how cheap i`ve done this particular one, well maybe it might be easy enough to get some "Serious" HP small bores Twinkys in the future... That is if anyone wanted to throw the right sort of money at them,,, but i guess not,,, they`re just small bores after all hey???

For instance... These 8V Bimmer heads all tend to have a decent sized "Lip" inside the inlet port around the short radius section of every inlet port,,, Obviously a critical area... we have found quite significant flow increases by simply "Blending" this area ,,, just simply neaten-ing it up & getting rid of the ridge/Lip... (not much work to do actually)
just imagine what some "Serious" work would produce hey???

Oh but then there`s allways the K1200 16v cyl head to play with too Maybe add some oversize lightweight forged motorbike pistons & add an 1100 cranks to get some decent capacity & ,,, oh,,, er,,, ar,,, um,,, maybe you don`t want to hear about any of that stuff right??? they`re just small bores after all hey?

_________________
No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

HI Matt
Come on Come on you cant keep knocking the small bores like
that every body knows that if big bores are so good BMC would
have made them first but they didnt, but to keep people like you
happy they just kept feeding them till they grew a little bit bigger
and the world was happy.
But if you keep this up ill have to come up there and EAT ALL YOUR
WAGON WHEELS so there take that
Graham Russell

Well, My birthday (March 1963) was the release of the big bore 1071"S" in England & that means they had designed & produced the big bore engine well before that, & everyone knows it was the real world beater of an engine winning everything in sight

but you`re more than welcome to come up here, eat all my wagon wheels & have many many cuppas, you can tune the bike carbs on this little small bore twinky for me while you`re hear

I`ll be going to Byron again next week so i`ll grab some more wagon wheels & send em down don`t eat them all at once & share them this time

MMmmm i feel like one right now Yum,, ---> (((insert sound of munching on wagon wheels here)))

_________________
No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

The biggest advantage of small bore eng is when it goes BANG they are a lot cheaper to replace than a 1275.
Not ever person has a big amount of cash to spend on a performance eng and when you look at a small bore/ bike head combo they are cheap HP
A block re-build ie crank/pistons only AND a complete bike head with carbys and pipes for less than $1500.
There are blokes who are doing engines like this who have done the machining/fitting and made the various componets from 2nd hand stuff them-selves that have built the whole engine up for under $2000
As for reliability, the bottom ends/clutches/gearboxes/axles will break long before the heads will. It all comes down to how good the assembly is done, same as any engine.
If the bottom line is performance then look at a modern engine of similar capacity IE bore/stroke and fitted with a modern design 16 valve 8 port twin cam head and compare the power output.
The bore/stroke/capacity/RPM are similar to a A series but the heads are the biggest difference.

_________________
Research is the difference between speculation and investment. Anyone who copys some one else will always be second
www.minisprintgt.com

yeah you`re right David, they`re cheap as chips & everywhere,,, every man & his dog has one or 2 of them,,,, one of my dogs has got heaps of them

seriously tho i think i have about 20x of them at the moment

anyways,,, here`s (hopefully) some pics

the little sh!tbox small bore 998cc with bike carbs sitting on the dyno about to have the carbs ripped off & up-size the main jet



the fuel curve (lean as sh!t in the middle & then going lean again up higher) on the computer,,, don`t ask me why Mr Squiggle went all Berzerk like that, it`s not my dyno,,, but Gary (dyno owner opperator) said something about RF interferance,,, whatever



sorry about the terrible pics, my scanner doesn`t work so they`re all off my phone camera,,, & there`s our old mate Mr Sqiggle going nuts again so Gary high-lighted the squiggly line to make it clearer for eveyone


so,,, yeah pretty horribel fuel curve,,, but as i said before, we will address that lot after i organise a bit more inlet length & make up some ram tubes, i`ll stuff an elecy dizzy in there & punch up some more ign timing, & then i will play with the fuel after all that,,, we should see it spin nice to 7500rpms with much more HP some more grunt (torque) all the way through (hopefully)

Oh & one more pic of my Niece (Charnce) down here for the skool hols sitting ontop of the Turbo injected moke at dads Place while dads gorking at all that stuff under the bonnet

_________________
No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

Is that the gratuitous beaver shot!?

_________________
Simon

The adventures of an owner builder in the Tallarook Ranges

Simon, dude your talking about the the mans little niece.... Hang on...

Top Shop Matty... interesting seeing the comparison between a well set up small bore and a standardish twinky small bore...

Great work as usual mate.

Matty

_________________
Here am I sitting in my tin can far above the Moon
Planet Earth is blue and there's nothing I can do...



“A turbo: exhaust gasses go into the turbocharger and spin it, witchcraft happens and you go faster.” - Jeremy Clarkson

My brother swears that no one will touch her till shes at least 50 years old cause he has this chastity beld called "A shot-Gun"

_________________
No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

Yeah sgc so eyes off you dirty perv!

Hey, Matt was the one showing us her spadge, so my eyes can do whatever they want

_________________
Simon

The adventures of an owner builder in the Tallarook Ranges

... Top thread Matt, Top thread, well done. So far we've had horsepower, punch ups, wagon wheels and now Simons got wood. Whats your secret? How do you plan it? What can we expect next?

Matt, you have the same mixture problem I had with the Kei-hin carbs on the F3 heads. The atmos side of the diaphram has a very small vent hole under the top cover. make sure that this is clear, and the jet in front of the carby you might need to drill it out .
I found out after [Steve showed me after I butchered the needles and jets] that the bike engines have a stupid PVC v/v control system that feeds the crankase fumes into the underside of the diaphram. If the vent pipe is open to atmos. then this causes the slide to lift and then drop as RPM increases. I blocked it off and opened the supply side jet.
Check when the engine is reved up and see what the slide is doing. The plastic slides stick
I kept thinking it was jets/needles and kept drilling out the jet and shaving the needle until steve set me right. Once he fiddled the carbys the engine ran rich as blazes. He got them set-up so that every time there was a change in butterfly position it over fuelled the engine . A puff of nice black smoke and then cleared right thru the rev range.
These carbs are a pain to set-up but once right they really crank some air and fuel in.
If you still have trouble with them I can still send you the set of quad 42mm off the F4 race replica head. They were set-up for the 1100 engine I tested and destroyed.

_________________
Research is the difference between speculation and investment. Anyone who copys some one else will always be second
www.minisprintgt.com