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mooman10_0
 Post subject: measurement qu's
PostPosted: Mon Sep 12, 2016 1:26 pm 
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1098cc
1098cc

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Location: Kaniva / Adelaide / Melbourne
Hi everyone,
A couple of quick questions:
What should the diameter be of a standard 1098 piston be?
Also What is the length of a steering rack? (checking to see if postable)
Thankyou,
Steve
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simon k
 Post subject: Re: measurement qu's
PostPosted: Mon Sep 12, 2016 2:03 pm 
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Location: Wodonga - Vic/NSW border
mooman10_0 wrote:
What should the diameter be of a standard 1098 piston be?


a smidgen less than the bore

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timmy201
 Post subject: Re: measurement qu's
PostPosted: Mon Sep 12, 2016 2:18 pm 
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1275cc
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Should be 64.588mm for std bore. Then up by approx 0.5mm for each 20 thou overbore (so +020 is 65.088mm). The pistons normally have something stamped on them if they are larger than stock - eg 020

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mooman10_0
 Post subject: Re: measurement qu's
PostPosted: Mon Sep 12, 2016 2:27 pm 
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1098cc
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Joined: Fri Sep 10, 2004 6:39 pm
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Location: Kaniva / Adelaide / Melbourne
thanks for that, just what I needed :-)
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winabbey
 Post subject: Re: measurement qu's
PostPosted: Mon Sep 12, 2016 2:38 pm 
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1360cc
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mooman10_0 wrote:
Also What is the length of a steering rack? (checking to see if postable).

96 cm

They are often shipped in a piece of plastic plumbing pipe.

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mooman10_0
 Post subject: Re: measurement qu's
PostPosted: Mon Sep 12, 2016 2:57 pm 
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1098cc
1098cc

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Location: Kaniva / Adelaide / Melbourne
Thanks :-)
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drmini in aust
 Post subject: Re: measurement qu's
PostPosted: Mon Sep 12, 2016 2:59 pm 
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Top of a piston is way less diameter than the bore, to allow for thermal expansion.
The bore clearance at the piston skirt is only around .05mm or less, except for race motors running forged pistons, which need more.

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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. :mrgreen:
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deluxe67
 Post subject: Re: measurement qu's
PostPosted: Mon Sep 12, 2016 9:44 pm 
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998cc
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Location: Bentleigh, Melbourne
Simon K,

Anda nakal!

Indonesian for "naughty person"

Haha....!

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850 GT
 Post subject: Re: measurement qu's
PostPosted: Mon Sep 12, 2016 10:14 pm 
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848cc
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Old mate should buy some measuring gear!

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simo74
 Post subject: Re: measurement qu's
PostPosted: Tue Sep 13, 2016 8:06 am 
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simon k wrote:
mooman10_0 wrote:
What should the diameter be of a standard 1098 piston be?


a smidgen less than the bore


Wish we had a like button. Like

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TheMiniMan
 Post subject: Re: measurement qu's
PostPosted: Tue Sep 13, 2016 5:48 pm 
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Joined: Mon Sep 06, 2004 4:36 pm
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std 998cc & 1098cc bores are 2.542"

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simon k
 Post subject: Re: measurement qu's
PostPosted: Tue Sep 13, 2016 6:42 pm 
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Location: Wodonga - Vic/NSW border
simo74 wrote:
simon k wrote:
mooman10_0 wrote:
What should the diameter be of a standard 1098 piston be?


a smidgen less than the bore


Wish we had a like button. Like


it's nice to be appreciated... my kids like my jokes too

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