No, the dish size is 13cc. The reason why the compression ratio is nice and turbo friendly is that the piston is 1.95mm under the deck. The Z20E pistons are actually 31.6mm, and regular L series pistons are all 38.1mm.
Here's the data for Mark's engine: Bore 86 Stroke 96 Piston pin height 31.6 Conrod length 145.9 Chamber volume 45.2 Block height 227.45 Piston dish 13 Shaved deck no Number of cylinders 4 Head gasket thickness 1.2 Head gasket volume 8.68 Deck height -1.95 Volume under deck 11.32 Swept displacement 557.64 Engine displacement 2230.58 Compression ratio 8.12 Rod/stroke 1.519 David Costello wrote: >hehe well that explains it then, those piston dishes must be pretty deep, >40cc is huge > >when I said 32mm Z20 pistons I was refering to the compression height. The >Z20's have 2 different pistons one set are 32mm high, the others are 38.55 >I was assuming you used the 32mm ones cause the 38.55mm ones would be above >deck height > >Dave > > >----- Original Message ----- >From: "mark krawczuk" <[EMAIL PROTECTED]> >To: <[EMAIL PROTECTED]> >Sent: Thursday, June 27, 2002 11:09 PM >Subject: Re: Tuning Cars (off topic) > > >>my bore is 86 mm, the gasket hole is a little bigger , so i reckon that >> >it > >>would be a hole of about 87mm. >>my head cc is 45 >>bore 86 >>stroke 96 >> 2mm head gasket approx 11.76 cc >> >>the volume with dished pistons that havent been machined , and the >>piston at tdc is 40 cc. (fluid level with top of block) >> >>what do you mean 32mm z20e pistons, mine pistons are 86 mm ( 1 mm >>oversize) >> >> >> i have been plugging these figures in a comp ratio calc and seem to be >>getting about 6.7:1 comp can any body double check these figures? >> i know before i said it was about 7.8 :1 but this is what i was pretty >>sure it was... which was of the top of my head. >>the figures above are actually what i have written down. >> >> >>mark k >> >>----- Original Message ----- >>From: "David Costello" <[EMAIL PROTECTED]> >>To: <[EMAIL PROTECTED]> >>Sent: Thursday, June 27, 2002 6:56 PM >>Subject: Re: Tuning Cars (off topic) >> >> >>>shit, how'd you get the compression that low? >>>the dish on the pistons must be huge >>>using Z24 crank, L20B rods, 2mm copper gasket and the 32mm Z20E pistons >>> >it > >>>gives a comp ratio of 11:1 >>>and you said you were running 87mm bore...that's around 11.4:1 >>> >>>Dave >>> >>>----- Original Message ----- >>>From: "mark krawczuk" <[EMAIL PROTECTED]> >>>To: <[EMAIL PROTECTED]> >>>Sent: Thursday, June 27, 2002 8:08 AM >>>Subject: Re: Tuning Cars (off topic) >>> >>> >>>>hi, i have dished z20 ( you can get flat or dished), which i got >>>> >>machined >> >>>>out a bit more, then when i had to redo he engine i just put the dish >>>> >>>type >>> >>>>back in withoutt geting them machined out more. i can work it out >>>> >more > >>>>exact if ya want me to but i think i ended up with about 7.8:1 or >>>> >>7.9:1 >> >>>>and yes, z20 pistons on l20b rods. >>>> >>>> mark k >>>>----- Original Message ----- >>>>From: "David Costello" <[EMAIL PROTECTED]> >>>>To: <[EMAIL PROTECTED]> >>>>Sent: Thursday, June 27, 2002 12:41 AM >>>>Subject: Re: Tuning Cars (off topic) >>>> >>>> >>>>>hey mark, slightly off this threads topic here, but what compression >>>>> >>>ratio >>> >>>>>did your L/Z combo end up with? >>>>>you used Z20E pistons and L20B rods didn't you? >>>>> >>>>>Dave >>>>>----- Original Message ----- >>>>>From: "mark krawczuk" <[EMAIL PROTECTED]> >>>>>To: <[EMAIL PROTECTED]> >>>>>Sent: Thursday, June 27, 2002 1:07 AM >>>>>Subject: Re: Tuning Cars (off topic) >>>>> >>>>> >>>>>>i have pics of the body, and engine but non of the internals of >>>>>> >the > >>>>>>engine. i did have some internal engine film on a handycam tape >>>>>> >>but >> >>>>it >>>> >>>>>>got chewed up, when i get the energy i might see if i can salvage >>>>>> >>>>>something >>>>> >>>>>>of it. >>>>>>if you want i can burn u a cd with some pics of my datsun. email >>>>>> >me > >>>: >>> >>>>>>[EMAIL PROTECTED] >>>>>> witth a postal addresif you want them .. for free !!!! >>>>>> >>>>>> mark k >>>>>>----- Original Message ----- >>>>>>From: "Paul Stanley" <[EMAIL PROTECTED]> >>>>>>To: <[EMAIL PROTECTED]> >>>>>>Sent: Wednesday, June 26, 2002 11:01 PM >>>>>>Subject: Re: Tuning Cars (off topic) >>>>>> >>>>>> >>>>>>>Do you have pictures? >>>>>>> >>>>>>>From: Paul Stanley >>>>>>> [EMAIL PROTECTED] >>>>>>> >>>>>>> >>>>>>> >>>>>>>----- Original Message ----- >>>>>>>From: mark krawczuk <[EMAIL PROTECTED]> >>>>>>>To: <[EMAIL PROTECTED]> >>>>>>>Sent: Wednesday, June 26, 2002 4:47 PM >>>>>>>Subject: Re: Tuning Cars (off topic) >>>>>>> >>>>>>> >>>>>>>>l20 b block (4cyl), with navara 2.4 crank,z18 efi head, T3 >>>>>>>> >>>>turbo@10 >>>> >>>>>>psi, >>>>>> >>>>>>>>ivan ttighe cam,boost retard dizzy,v8 commodore throttle body >>>>>>>> >>and >> >>>>>>toyota >>>>>> >>>>>>>>7mgte injectors.......... >>>>>>>> >>>>>>>> mark k >>>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>> >>>>> >>>> >>> >> > > --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[email protected]/ ---------------------------------------------------------------------
