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Post by psychedelicropcircle on Mar 25, 2018 18:20:09 GMT 1
This has been lying on a shelf dead 💀 for a few yrs always had intentions to revive it. Ceramic lined & Rebored to 65mm 195 cubes now & with an over sized crank it’ll be 200 cubes ☄️
Had hoped to change the inlet & reeds but the gear sent up is incompatible 🤬
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Post by Chrisb on Mar 26, 2018 10:55:50 GMT 1
funny ... was talking about this last night when they raced a car round Imola on top gear last night
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Post by brads on Mar 28, 2018 18:32:37 GMT 1
Does using the crank to gain CC`c not lower your compression ?
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Post by psychedelicropcircle on Mar 28, 2018 20:18:36 GMT 1
Compression is generally adjusted by a volume increase or decrease in the cylinder head bowl or a different shaped piston crown. The cubes are gained in the crank web size. By putting in bigger web size I.e 60mm a 2mm increase, increases the swept volume 1mm to the front & back as the web rotates. Oversized cranks usually come with longer rods & you use packer plates behind the cylinder to keep ports aligned. The vibration as you go along has noticeable reduction.
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Post by brads on Mar 31, 2018 0:36:02 GMT 1
So making the crank travel 1mm higher will increase compression if the same piston is used ? or lower if you use a shorter crank to increase CC`s (less swept volume but more capacity in the combustion chamber.)
I get the bit about CC`s, but it must affect compression unless you compensate using a suitable piston ?
Surely ? lol.
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Post by NorryC on Mar 31, 2018 10:30:24 GMT 1
Would all be in the squish clearance 1 would presume
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Post by brads on Apr 1, 2018 19:30:37 GMT 1
Hmm Ah hink ah`m confusing the web wi the conrod. The compression hing still stands though.
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Post by psychedelicropcircle on Apr 1, 2018 21:47:32 GMT 1
In the case of this kit the cylinder head was adjusted to suit an MB piston. In the case of using a longer rod I.E 110mm a 3mm increase you’d use a 3mm packer that makes everything where it was only 3mm further forward. So IMO the adjustment is in the cylinder head bowl. When Rab McKay builds engines he makes the squish the maximum where as beasties bike has that much compression it’s ferked 3 kickstart shafts knee-eyed-ear wot the squish setting is on his.
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Post by psychedelicropcircle on Apr 15, 2018 11:10:09 GMT 1
no gonna bother wi the crank unnecessary weight   |
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Post by beastie on Apr 21, 2018 0:41:29 GMT 1
In the case of this kit the cylinder head was adjusted to suit an MB piston. In the case of using a longer rod I.E 110mm a 3mm increase you’d use a 3mm packer that makes everything where it was only 3mm further forward. So IMO the adjustment is in the cylinder head bowl. When Rab McKay builds engines he makes the squish the maximum where as beasties bike has that much compression it’s ferked 3 kickstart shafts knee-eyed-ear wot the squish setting is on his. |
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Post by beastie on Apr 21, 2018 0:42:08 GMT 1
It's just slightly more than a gnats baw hair
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Post by psychedelicropcircle on Jun 10, 2018 15:21:28 GMT 1
 still tinkering wi the S1 to be fair...….wonder if this'll be done before nige comes down for a cylinder hes been askin after  |
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Post by Nige on Jun 10, 2018 23:16:24 GMT 1
still tinkering wi the S1 to be fair...….wonder if this'll be done before nige comes down for a cylinder hes been askin after  |
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Post by psychedelicropcircle on Oct 6, 2019 15:33:48 GMT 1
 the longest rebuild in history! tbf I have been delaying this until the MC was built so its time to get it done. hopefully pick up a gearbox at southport & this should allow me to have the topend & chaincase done leaving ignition carb & zuarst to sort |
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Post by brads on Oct 7, 2019 23:27:15 GMT 1
What gearbox you after.?
Not 100% what I've got stashed in ma garage.
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