I'd save the head you have and get another and do some playing with that

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Stop Licking the Dog...I Don't Care Who Started It

im going the supercharger route on my mini as you may already know, but whilst im saving for the kit, im getting everything else ready to bolt it striaght on, BUT i still havent got around lowering the compression, main reason being i have no idea what it is on my car at the moment (meaning the actual figure not what compression actually is). How do you measure it and is it possible to do whilst the engine is still in the car?
thanks
trent

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Well i just read the bit about hydro minis not working with this kit so i may have to rethink things here.

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- Simon -

Not entirely true.

It WILL work with hydro suspension, but the passenger side pipe will need relocating.

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[NATHAN] -- Sold everything mini related and am back in big beautiful BMWs

Any hydraulics place (Pirtek, EnZed etc) can make a new steel pipe to shape, if you take an old one and tell them what you want.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

For low boost applications standard compression is fine with standard pistons forged pistons only need when getting really serious.
To lowr compression idealy use low comp. pistons or increase combustion chamber volume. you can also use a decompression plate which fits between block and head.
To measure compression ratio you need to know the combustion chamber volume piston dish volume, piston to block deck height so you need to remove the cylinder haed to measure it acurately. But if the compression is below say 150psi on cylinders it is probably standardish or the engine is buggered.

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4efte powered Clubman
supercharged 998 race car

so whacking a supercharger on a standard 1100 motor, what boost could i expect to be able to run and then what would you compare that power too 1300 or lowere etc??

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Potato

Provided the engine is in good condition 7-8psi boost should give you performance of a mildy tuned 1275

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4efte powered Clubman
supercharged 998 race car

hey,

i'll be finally fitting the kit soon to a 1100 with cam, extractor, exhaust, maybe a 1275 head, and a pulsar dizzy,

im hoping for round 60hpatw, do you reckon thats achievable with that short list??

just wondering what you reckon?

blake

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ausmini member 195

71K 'Kaye', KAZZ69's work in progress
66 panelvan, going no where fast...
71 MS75 toyota crown COUPE yes A COUPE!
76 ra23 celica wid 1ggte, GT3071r, 13.5@106mph with alot of spinin....

wheels keep on turnin!

When you get the cam ground don't use a cam for an NA motor. A cam for a blower is totally different as overlap is not the issue, lift is. Go to someone who understands this and if they don't find someone else who does.

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Chris

Everything I like is either
illegal, immoral or fattening.

Talk to GR, he will grind you a special cam with wider LCA.
The one he did for kazjim's 998 turbo gave 72HP at the wheels with a fairly stocko port 202 head.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

I got one frtom graham for my super charger 1360 motor with a wider lca about 112 degi think he said but i must check it out.

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www.minicranks.com add me to your watch list and come back again soon, under construction.

lobby should probably get more like 70 - 75HPatw
In vizzards book he talks about cam LCA's supercharger decrease LCA to increase overlap to increase cylinder purging, turbo increase LCA to reduce overlap as you have greater exhaust back pressure which fills cylinders with exhaust gases.

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4efte powered Clubman
supercharged 998 race car

yeah ive been doing quite a bit of reading of vuizards books....TUINING BL's A series, (damn good book!)

70-75hp atw.....I CAN LIVE WITH THAT!!!

blake

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ausmini member 195

71K 'Kaye', KAZZ69's work in progress
66 panelvan, going no where fast...
71 MS75 toyota crown COUPE yes A COUPE!
76 ra23 celica wid 1ggte, GT3071r, 13.5@106mph with alot of spinin....

wheels keep on turnin!

will do!!!!!

blake

_________________
ausmini member 195

71K 'Kaye', KAZZ69's work in progress
66 panelvan, going no where fast...
71 MS75 toyota crown COUPE yes A COUPE!
76 ra23 celica wid 1ggte, GT3071r, 13.5@106mph with alot of spinin....

wheels keep on turnin!