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drmini in aust
 Post subject: Re: piston choice
PostPosted: Mon Dec 14, 2015 8:36 pm 
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Joined: Fri Mar 19, 2004 6:19 pm
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Location: near Baulkham Hills, NSW
1100 cranks are getting scarcer. Make sure you crack test them when buying, they are more prone to crack than 998 ones.
You can offset bore to 68mm, this will give 1108cc with a 998 crank or ~1220cc with an 1100 one. If using GR's 68mm pistons you deck the block about .140" if running a 998 crank.
A 1275 head gasket is used but smallbore heads need some water holes moved to clear the fire rings in it. See Graham's website.

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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:


Last edited by drmini in aust on Mon Dec 14, 2015 8:41 pm, edited 1 time in total.

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bluewhitecoopers1968
 Post subject: Re: piston choice
PostPosted: Mon Dec 14, 2015 8:36 pm 
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998cc
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Joined: Mon Mar 07, 2011 3:29 pm
Posts: 616
Location: Close to Maitland NSW
TheMiniMan wrote:
he probly meant the same cost?

1100 cranks are a bit harder to find cheap "ready to fit"
but definitely instant more torque & capacity, "fairly cheaply"
small bores we "usually" set-up at 9.5-ish:1 CR depending (mainly on cam choice of course)
please don`t run "polished" inlet ports, , , polish the cmbstn chamber if you want to polish something
or even the exhaust ports if you must, but leave the inlets in a coarse emery finish.

As I said $300 if it needs a regrind.
9.5 ish... 10:1 sounds ish enough lol
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mooman10_0
 Post subject: Re: piston choice
PostPosted: Tue Dec 15, 2015 2:43 pm 
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1098cc
1098cc

Joined: Fri Sep 10, 2004 6:39 pm
Posts: 1770
Location: Kaniva / Adelaide / Melbourne
Went with Graham Russell 60thou flat tops, having an 1100 crank reg round that I located in Adelaide.
Hopefully be putting it all together in the coming months :-).
Now that I have split the motor, who has some tips on checking gearbox ( remote), to see if it will not jump out of any gears? All moves freely and teeth all good.
Cheers,
Steve
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mooman10_0
 Post subject: Re: piston choice
PostPosted: Tue Dec 15, 2015 3:31 pm 
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1098cc
1098cc

Joined: Fri Sep 10, 2004 6:39 pm
Posts: 1770
Location: Kaniva / Adelaide / Melbourne
Gearbox casing says 22G68
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gtogreen1969
 Post subject: Re: piston choice
PostPosted: Tue Dec 15, 2015 3:34 pm 
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1275cc
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Start a new thread on the gearbox. And add any details on noises or crunching.
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drmini in aust
 Post subject: Re: piston choice
PostPosted: Tue Dec 15, 2015 3:40 pm 
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Location: near Baulkham Hills, NSW
That's an old 3 synchro, new parts are getting harder to find now.
I'd bung a 22G1128 (Mini K etc) 4 synchro remote box in, gear ratios are a bit better , synchro on 1st and it's a stronger box. All the gears are same as in an early rodchange (except reverse).

_________________
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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