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Piston Rings.
Posted: Fri Jul 18, 2008 9:40 pm
by wanderinstar
Can anyone tell me what the ring gaps should be for a standard bore, also is there a knack to fitting them. Thumbs or special pliers?
Posted: Fri Jul 18, 2008 9:42 pm
by bmcecosse
Thumbs - and never had to 'gap' one yet Ian ! As long as there IS a gap ie they are not solid closed they will be fine.
Posted: Sat Jul 19, 2008 7:12 am
by Alec
Hello Ian,
I concur with BMCE on the gap, that is my experience also. However, I prefer to use ring pliers. If you do use your thumb be careful as they are quite sharp?
Alec
Posted: Sat Jul 19, 2008 10:14 am
by wanderinstar
OK then. Thank you both very much. Finally getting round to building up spare engine Roy. Have had block pocketted, ported head a fair bit and just had it all painted. What is anyones thoughts on triple angle valve seats and 30deg cutback on valves. Will it be benificial on a 1098 with a 1275 head? I tend to think not, but am willing to stand corrected.
Posted: Sat Jul 19, 2008 5:42 pm
by Alec
Hello Ian,
I do a triple cut when I do a head but I can't say how much benefit it is. Certainly a narrow seat is supposedly a good thing and as I have a lathe making up the pilot and stones is quite easy.
Alec
Posted: Sat Jul 19, 2008 5:53 pm
by bmcecosse
Narrow seat on the inlets is good - in fact so narrow there is just a line ! This is achieved by cutting the valve throat out - you can take away quite a lot! Exhaust - just leave the seats as standard for best heat transfer. Well worth going down the exhaust throats - the corner at the guide is VERY tight and it can easily be opened up to allow the gasses an easy run round the bend!