just to clarify matt but there's no issues with the N/A twinky conversions, these teething problems are due to the turbo setup you're testing?

The way I read it, the engine was taking too much boost without being properly tuned and shat itself for that reason. I'd guess the N/A version would be much more forgiving and less likely to go BANG if slightly out-of-tune.

This is true of any turbo vs N/A engine anyway, not just the Twinky conversion. The thing with the Twink is that it revs so hard and accellerates so fast it's much easier to reach terminal revs unintentionally.

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Simon

The adventures of an owner builder in the Tallarook Ranges

David, thanks man, you are always very helpful , honest & sincere & i appreciate it all to the "N"th degree , & some.... & i will be talking with you soon about the twin plate system,,, But that will most probaly be more to suit my race donk,,, I`ve been talking with piles of people over the last couple of days about all sorts of issues, one of which is the clutch systems,,, & of course talking about all the other fiddly timing & boost issues we have encountered

My dad set up a twin plate clutch system back in the early days , specifically for hard core turbo & supercharged situations so we`re back onto that idea again, but, like i said , mainly for my race twinky,,, I`m absolutely certain that a double grey will do the job for this one with the AP competition plate,,, i just wanted to keep it as a compromise for the road use ---> for the customer to be able to help stop shredding flywheels & p/plates & c/plates & also make it "easy" on him to drive civilised on the streets (hard to do i know), but we`ll just give him the decent grab of a double grey & an AP comp plate & be done with it,,, """BECAUSE"""!!!!!!!,,, i`ll be buttoning this thing back down to 7lbs boost & retarding ign & setting rev limit lower & etc etc etc,,, i really don`t want to see concreat gutters eat his 13x8 superlites & discs & panel damage & personal injury from stepping sideways when he`s not used to it,,, at a later stage we may add some more oomph as his driving skills & experiance (& wants) improve

As i`ve said before,,, this whole cock-up was all my own stupidity "Playing" with it before it was sorted properly, & not running a decent clutch to start with.

But i "WILL" be talking with you soon about a decent twin plate clutch for my race twinky,,, that`s for sure.

Clutch-Monkey,,, you`re right yes,,, turbo over boost, way to much over advanced & my dumb-arse right foot isn`t a good combo,,,thay`re definately not a problem for N/A,,, don`t be worried,,, we have had this particular engine running in N/A form for over a years worth of driving stuffing around (over quite a few years mind you) tuning & sorting other fidlly teething problems, all sorts of stuff, re-designing & refining our kit & changing stuff , computers, manifolds etc etc & it is all proven to be solid as a rock,,, we did it that way for that exact reason,,,, the problem with this one was simply a stupid over advance problem & my big fat dumb-arse right foot

all the boys were over last night for drinkahols & we all planned to rip it all apart... but i pulled the pin on it, --->"my stuff up, i`ll fix it" type of thing,,, we sat & drank & talked crap & reflected & & & & ,,, well you all know what a night like that is

But, in the process, i worked out the exact problem,,, the "Real" cause to this melt down,,, & here it is, plain & simple---> My dumb-arse excuse for a brain decided to tell my dumb-arse big fat right foot to push a bit harder, & a bit further, for a bit longer, even tho my dumb-arse excuse for a brain already knew not too,,, But my dumb-arse excuse for a brain didn`t listen to that tiny-weeny little part of my dumb-arse excuse for a brain that actually has any common sense... I know now (& i knew it then) that if my dumb-arse excuse for a brain had actually listened to that tiny-weeny part of my dumb-arse excuse for a brain that has any common sense, then we would have simply had the clutch changed over that night, had the tuner back onto the advance issue yesterday & we`d most probably have been back on the dyno today with it & we all agree that the pistons would most definately still be the correct shape & consistancy right now.

The only problem i have with all that is that they all actually agree with that sumation

so,,, No mate,,, twinkys are solid,,, Check out Jimsters Turbo Twinky on Youtube--> Sheepspeed racing something or other,,, it`s wicked fast & over 200hp & still climbing

& they are many many more with plenty of grunt , most of them holding up wonderfully, so N/A ones are no issue at all mate.... the real problem is the dumb-arse "LazyGoodForNothingSmartArseKnowItAllBackYardMiniMechanicsDumb-ArseExcuseForABrain`sLackOfCommonSense" that caused this stupid stuff up

did i mention how much of a dumb-Arse i am???

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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.

ha ha,,, now sgc is just saying the exact same thing as me,,, with less words,,, & quite politely i might add, thanks man,,, you`re being nice to me,,, you could have just said that Matt was a dumb-arse

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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.

cheers for the clarification
hopefully keep the right foot in check next time matt!

I'm only being nice 'cause I want a looksee when I show up in September

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Simon

The adventures of an owner builder in the Tallarook Ranges

Matt...I'm breezin through Brizzie in a couple of weeks...and was goin to suggest something...but, you are obviously going through a David Carradine stage Grasshopper So...oil pass

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"Show me the Mini!"

Man you can type a lot Matt Congratulations on all the events, getting it to hammer, passing 140bhp, and also on finally killing one
Good job Matt, now back to the shed and re-build that donk

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Respect mine and I'll respect yours.

oky doky,,, it`s all apart & it`s only cracked the ring "Lands" on the pistons,,, All the rings are actually still fine (altho i obviously won`t be using them again, except maybe on a 2nd hand sh!tter roady donk of my own one day, so i`ll keep them anyways)

But i`m a bit happier now,,, no bore problems, the bearings are sweet,,, the crank is just ever soooo nice & shiney smooth,,,, it`s all good `cept Pistonies

so,,, i`ve been chasing around for some "You-Beauty" Forged race pistons, maybe JEs or Ross or Arias whatever comes along asap

I`ve allready got the double grey comp clutch diaph & super duty AP comp race c/plate

I have to sort the clutch master cyl & the hose, (feels a bit dodgey so i`ll make sure it`s all sweet while the donk is out),,, there is some stoopid weired horrible home made gearshift mount fitted that sux bad to get the gears , so i`ll be sorting that while i`m at it too

But apart from all that we`re back in business



I can`t believe the rings weren`t broken tho,,, wild

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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.

Hey Matt, what is the exact bore size and height from center of gudeon to top and the dia of the gudeon pin you are using.
I might be able to find you some from a bloke that I am getting my forged pistons from. He is supplying me some that are a press fit in rod instead of circlips. The pin is 19.37????mm,[ 3/4"]. The pistons I am getting are 67mm but he can get them in 1/2mm sizes upto 74mm.
They are GOOD quality race ones, and not badly priced.

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

Cool thanks David, i`ll measure the pin to top dist tomorow but they`re 73mm diam (.094 oversize) & are std press fit mini pins as per std 1275 mini, i`ll make sure of their diam tomorow too

I have some 72mm forged bike pistons here that i was going to make fit another twinky turbo donk,,, but i`m not going to bother sleaving this one down to suit them, just a quick hone & throw new lugs in & away i go again with this one.
cheers mate

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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.

well i guess thats pretty good news. id love to eventually design and build my own twinky or something like it.

dont worry about the small set backs im sure you will be able to rectify them quickly.
goodluck with the completion of the engine, cant wait to see the final figures

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1975 Leyland Mini: 1060cc - resto/ ex-hsc project.

How in hell did you get it out to 73mm. what crank are you using. I thought that 68mm was the max you can bore out to, but I did read that some bloke o/seas got a 850 block out to70.6mm and built the eng up with 850 crank,[1071cc]

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

1275 block

Any update Matt, im getting keen to see this build finished.

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