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PostPosted: Thu Apr 12, 2018 8:17 am 
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Joined: Thu Jun 24, 2010 11:30 am
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A 30 thou skim would be somewhere around minus 2.5cc from standard.

Mark F
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PostPosted: Fri Apr 13, 2018 7:44 pm 

Joined: Fri Jan 07, 2011 9:26 pm
Posts: 469
Location: Scotland
mellowyellow wrote:
mk1 wrote:
A 295 should need very little skimming off it when used with an 1100.

Dug the head from the shed tonight and it measued a 30 thou skim. Would this be okay for an 1100? How far can you go as i think the face could do with a light freshen up, thanks Tim

If needed the 295 should be able to take quite a bit more than 30 thou skim, the limiting factor is the amount of metal left between the oilway drilling to the rockers and the lower face of the head.

Also bear in mind that the 295 head is just over 28cc chamber as std, while the standard 1100 head is about 25cc. So your 295 head with 30 thou skimmed off should give you about same CR as with a standard head if using std 1100 pistons.

The twin carb 1100's were slightly higher 8.9 CR than the std single carb 1100 at 8.5 CR. The twin carb motors used different pistons with much shallower dish along with the 295 head to get this higher CR.

PostPosted: Tue Apr 17, 2018 5:34 pm 

Joined: Mon Jun 28, 2010 9:54 pm
Posts: 109
Thanks Mark and Carbon for your information. The head is now in the machine shop for a good clean up and check over, so will know soon if anymore skimming is needed and or any other work, thanks again Tim

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