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mini-dunger
 Post subject: How much compression?
PostPosted: Tue Nov 06, 2007 8:21 pm 
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Hi all

1098 +.60, RE13, How much compression should I run? I would do exctly what Sir Vizard says but he is a bit vauge in his book. I have no issues using premium and a octane booster if need be.

Thoughts ?

Thanks guys

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drmini in aust
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PostPosted: Tue Nov 06, 2007 9:01 pm 
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You can use up to around 10.5:1 with an RE13.
My 1310 ran fine with one at 10.4:1.
It used to be 11.0:1, that was too high. Couldn't stop it pinging. :lol:

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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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sgc
PostPosted: Tue Nov 06, 2007 9:04 pm 
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mini-dunger wrote:
1098 +.60, RE13


What head you got there?

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Simon

The adventures of an owner builder in the Tallarook Ranges

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mini-dunger
 Post subject:
PostPosted: Wed Nov 07, 2007 7:04 am 
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its a 12g202 with 33mm inlets and 27mm exhaust valves + about 50 hours :shock:

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blokeinamoke wrote:
Yep Mokes are ugly - but Moke owners know that. Its like ugly women - she may be a dog but you know your going to get some :wink:


Last edited by mini-dunger on Wed Nov 07, 2007 7:26 pm, edited 1 time in total.

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drmini in aust
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PostPosted: Wed Nov 07, 2007 6:30 pm 
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mini-dunger wrote:
its a 12g202 with 30mm inlets and 27mm exhaust valves + about 50 hours :shock:

I did the valves, those inlets are 33mm. :wink:

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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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Smegger
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PostPosted: Wed Nov 07, 2007 6:42 pm 
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drmini in aust wrote:
mini-dunger wrote:
its a 12g202 with 30mm inlets and 27mm exhaust valves + about 50 hours :shock:

I did the valves, those inlets are 33mm. :wink:


:lol: :lol:

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mini-dunger
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PostPosted: Wed Nov 07, 2007 7:25 pm 
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thats what i said :D

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blokeinamoke wrote:
Yep Mokes are ugly - but Moke owners know that. Its like ugly women - she may be a dog but you know your going to get some :wink:
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sgc
 Post subject:
PostPosted: Wed Nov 07, 2007 7:28 pm 
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Why such large inlets? I would have thought you'd get better performance with bigger exhaust valves than inlets... at least on a smallbore.. ?

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Simon

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drmini in aust
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PostPosted: Wed Nov 07, 2007 8:26 pm 
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sgc wrote:
Why such large inlets? I would have thought you'd get better performance with bigger exhaust valves than inlets... at least on a smallbore.. ?

You have exhaust pressure to blow exhaust out. You have 1 atmosphere air pressure only to push it in.
GR uses these valves, and nobody I know gets better power from a smallbore with 202 head. 8)
They are Morris 1100S/1275LS valves, with the exhausts turned down to 27mm and the seat face recut. The inlets are stock dia but have the heads backcut 30° same as Vizard suggests.
To use inlets this size in a 202 head it must be deshrouded severely, it looks pretty much like a 295 chamber when finished.
Here's one I prepared earlier (before polishing)-
Image

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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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Lillee
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PostPosted: Wed Nov 07, 2007 9:03 pm 
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10.5:1 is good enough, anymore and you will ping if you have bad fuel. I run 10.2:1 and when cold and on bad fuel I can hear her ping...

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willy
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PostPosted: Wed Nov 07, 2007 9:04 pm 
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I run 11.4:1
With 98 Octane fuel.
And a special cam :lol:
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drmini in aust
 Post subject:
PostPosted: Wed Nov 07, 2007 9:05 pm 
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willy wrote:
I run 11.4:1
With 98 Octane fuel.
And a special cam :lol:

And, I now know what cam it is.... :wink:
I've now got one too. 8)

Chong, you aren't supposed to leave da fuel in da car for 3 months like you just did. It ain't 98 anymore, it's more like kero. :lol:

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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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Lillee
 Post subject:
PostPosted: Wed Nov 07, 2007 9:28 pm 
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yeah as I said, bad fuel... :P

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slinkey inc
 Post subject:
PostPosted: Thu Nov 08, 2007 1:45 pm 
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Sounds like a fun engine you building, Mini-Dunger. :)

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mini-dunger
 Post subject:
PostPosted: Thu Nov 08, 2007 4:50 pm 
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Should be,

Everythings been lightened and made all nice so it should be nice.
Heres my head, I still have to press the guides in, smooth out the roof of the chamber and have the valve seats cut and about an inch milled of the deck.

excuse the paint I was using it as kind of a guide coat...its darkish in my shed :D

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blokeinamoke wrote:
Yep Mokes are ugly - but Moke owners know that. Its like ugly women - she may be a dog but you know your going to get some :wink:
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