mpett Posted December 21, 2004 Posted December 21, 2004 Firstly, I would like to thanks everyone for their comments and help so far! They have been very helpful in deciding how to go about the rebuilding process! My question is this....the next stage of the rebuild, having absorbed the Haynes manual and the, 'pinto power tuning book', is to order all the seals, bearings, rings etc which need replacing. In the Haynes manual, at the begining of the engine section, in the specification section there are different figures mentioned for things like pistong rings, valves and bores. eg. Cylinder bore, Bore diameter: Standard class 1 Standard class 2 etc.... Oversize class A Oversize class B etc.... Standard service Oversize 0.5 Oversize 1.0 I am sure I've seen a description somewhere, as to what they mean but I can't find it anywhere. Are there any bright sparks out there who can help? Finaly, Ford dealer, Burton or Vulcan engineering for replacement parts. Bearing in mind I live in Fleet, Hampshire and would like some slighly higher performance parts! Quote
scruffythefirst Posted December 21, 2004 Posted December 21, 2004 Bore size is the diameter of the cylinder, you need a piston that will fit in it (obviously) but there needs to be a certain amount of clearance. When ford made the engine the bores were different sizes (tools wore etc) and so were measured and given a class. Pistons came in different sizes too and were matched to different classes of bores. So if you've got a grade 2 bore you need a grade 2 piston to ensure the correct clearance for when the piston expands. If your having a rebore then you need to get pistons to match the new size or have it bored to the correct size for the pistons you currently have - unlikely to get away with much more than a hone if your using the original pistons. Piston rings also coem in different sizes and the gap needs to be measured so they dont bind int he cylinder when they get hot. hth Quote
mpett Posted December 22, 2004 Author Posted December 22, 2004 So how do I know what class engine I have? Will it be defined by the wear/measurements of the bore itself?? Or is this associated with the engine number? Cheers Quote
Blatman Posted December 22, 2004 Posted December 22, 2004 There should be a row of numbers right next to the hole for the distributor. That'll tell you what grade each bore is. A complete set of 2's is very good. My Cossie block doesn't even have a full set of 2's... Quote
scruffythefirst Posted December 22, 2004 Posted December 22, 2004 My brand new 200 block didn't have a full set of 3's either. It does now though The old one had a full set of 2's though. There should be a number on the top of the pistons too Quote
scruffythefirst Posted December 22, 2004 Posted December 22, 2004 My brand new 200 block didn't have a full set of 3's either. It does now though The old one had a full set of 2's though. There should be a number on the top of the pistons too Quote
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