CRs fao mark
Turbo Mini Forums

No drinking???

Jim will be most upset at Avon park... I think theres a whole Keg to get through!!!

AlexF

"does it really matter? "...not at all

"FFS Mark just get on and build your next car"...making a start today!!!

Everyone knows that instructions only have to be read if the thing doesn't work....

You've lamped me several times when you where pissed mark!

I know you don't remember as totally ratbagged!, that was after 2 halfs of lager and lime too!

Anyone remember "brownbottle" from Viz???, the pissed up Geordie super hero...it's Mark!

there`s not a little smilely for humble pie so i`ve writen it instead.

Everyone knows that instructions only have to be read if the thing doesn't work....

lol yes I remember Jon!

So what you got to do to the new car?

Is it going to be FUN?

Alex

AlexF

I know this is very sad ........simon who used to run or maybe still does run viz, lived round the corner from my shop in jesmond, he is into mini`s thats how i got to know him , didn`t know he was any one well known or anything.
He did a feature on sudent life in jesmond , which is the big student area in newcastle.
Anyway on the map in viz he marked my shop and put it down as the porn place ( pre internet) and watch out for owner in his turbo mini , fastest paperlad on tyneside.

Very sad isn`t it.

Everyone knows that instructions only have to be read if the thing doesn't work....

claim to fame mate, have you got a copy of that mag, make a good image for sheepspeed

Team Racing

no , never thought to keep it

Everyone knows that instructions only have to be read if the thing doesn't work....

do you know what issue?

Team Racing

got to 8 or 9 year ago

Everyone knows that instructions only have to be read if the thing doesn't work....

ok, maybe I should put a thread in the wanted section

Team Racing

i think your figures are wrong alex....whats your deck height,gasket bore and gasket compressed thickness

mark

Edited by mark4765 on 14th May, 2004.

If you don?t know the deck height assume the worst. Std bore engine has roughly 4 cc?s of cylinder volume for each 1 mm (0,040") that the piston is below the deck. So for 5,25 cc the pistons should be something like .050" down the bore. I doubt that. I?d recommend that you re-calculate with .015-.020" to be safe until you really measure the actual value.

I usually use 3,5 cc volume for combined head gsaket + ring land volume, this way the possible error gives me too high a CR compared to actual compression.

With your figures Jukka... I get 7.7:1 CR

Anyway wants to have a look or play with figures... goto

www.afracing.com/cr.xls

Alex

AlexF

i got 7.76:1 alex using this...the best comp ratio tool ive seen... http://www.maverickracing.co.uk/compratiosoft.htm

Edited by mark4765 on 15th May, 2004.

so what do you make mine then, with 10cc omegas +020 and 30cc head

Team Racing

I'll measure it next week while the heads off. The gasket is a bk450

Edited by Jimster on 15th May, 2004.

Team Racing

[

Edited by minimark on 15th May, 2004.

Everyone knows that instructions only have to be read if the thing doesn't work....

Alex - just checked one of my spare 'turbo' engines. The pistons aren't machined so are a bit tricky to measure the height from the deck to the squish band - so i took three measurements.
0.1
0.4
0.25
hence, taking averages, you can assume the pistons are 0.25mm down, and on a 1275, this is just shy of 1cc...

The 'turbo' pistons defiantely sit higher than the nat asp ones...

how many thou is that?

alex

AlexF

10

Everyone knows that instructions only have to be read if the thing doesn't work....

Bore 70.61mm
Stroke 81.4mm

Gasket Volume 4.00cc
Ring land Volume 0cc
Piston Volume 12.00cc
Head Chamber Vol 30cc
Deck Volume 1cc



I make that Compression Ratio 7.78:1

so I am probably between 7:1 and 8:1.. which is fine as I'm happy with 8:1 amyway

Alex

AlexF

i make that 7.7897:1 alex

Edited by mark4765 on 16th May, 2004.

sorry not acturate enough for me, i`ve run the figs through a number of PC`s and came out with ..
about 8/1 ish canny for aboooot a bar .

Everyone knows that instructions only have to be read if the thing doesn't work....