Thankyou sir matt.

i will be taking your advice...but it aint going to be a workable situation witout some grinder!

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speed costs....how fast do you want to go...

Have you considered getting some dished pistons instead of flat top?

I hear they are better for combustion (well, that it moves the piston better/ burns more evenly or some such!) than flat top anyway!

good luck,

Matthew

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68 Deluxe.... it's shiny..... I like shiny!!

If you had a 6cc dished piston, plus a 24cc chamber head, plus 1.5cc at top of piston at TDC,

SV = 356.2168, CV = 24+1.5 + 3.5 + 6 (35cc)
Total Volume = 391.21....cc

391.21/35 = 11.17:1 CR Static.

The more dish in the piston the less to take off the head!

Hmm, I think, you will need to:
Burette the head as Madmatt says, Burette the top of the bore with piston at TDC.

Get some 6mm dished pistons, and do the minimal work to the head for good flow, you'll be somewhere around this figure without monstering the head.

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68 Deluxe.... it's shiny..... I like shiny!!

If you are boring to 74.7 and using Triumph 2.5PI pistons they are heaps shorter, so just don't deck it heaps. Leave them down the bore a bit.

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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.

Sadly, the block had been machined when i bought it, so im stuck with what i got.

why do i gravitate towards these weird engines? makes life interesting i guess.

i believe elder will make a fairly large chamber if you ask them !!!

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speed costs....how fast do you want to go...

Doc is right with the triumph 2500 pistons,,,, ususally they are well down the bore tho, so i can`t see them being in there unless someone has decked a good 1/4 of an inch or more off the top of the block,,, anything is possible these days tho, every Tom, Dick & Harry has had a go at reco-ing mini engines & all sorts of wild & wiered combinations have been born

Mine is actually like that tho & i`m using small bore poush rods & shortened head studs

But be carefull tho because there is also the triumph 2000 piston which is the same bore but is quite tall

buy a burette,,, it`ll be the best thing you ever bought

& i can make your cyl head chambers into a bath tub if you need it that way, don`t be scared

Edit,,, Ok so i just re-read your first post,,, It really IS like my 1510 donk , except without the extra stroke

still,,, i can make your head into a bathtub, just give me a stock one that hasn`t been shaved & you`ll be sweet, I`ve got 32cc out of them quite commonly & have actually made a 35cc one years ago & it`s still a runner

I just don`t recomend that you try that at home kids, i really don`t like to see wasted 1275cc cyl heads

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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.

i will be digging it out of the shed today, and having another look at the pistons.

Dont wory matt, il be getting thins done well, if im going to persue this, i want it to work!

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speed costs....how fast do you want to go...

Just thought I'd post this Youtube I found
http://uk.youtube.com/watch?v=OGuOMItsC ... re=related

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