Discussion
No, its not tight tolerances, from what I understand it to be is getting the measurements as equal as possible. For example, on a normal engine rebuild, if there is suppose to be say .01 inch tolerance between the piston and cylinder wall, then all the pistons will be measured and the corresponding cylinders will be honed to that tolerance. The piston diameters can vary, say the bore is 4.00 inches, the pistons may vary from 3.995 to 4.005 and as such the cylinder bores will vary by the same... though all will have the correct .01 tolerance. same goes for bearings, except the crank is usually turned to a certain size then using plasti-gage, the bearings are checked for a tolerance range.
for a bluprinted engine, say the S6, an engine builder may order 2 or 3 sets of pistons (12 or 18) to get all 6 pistons at exactly 4.000 inches, same with the bearings, he may use a combination of 2 or 3 sets to get the tolerances equal if all the crank journals have been turned to an equal diameter.
i wait to be corrected
for a bluprinted engine, say the S6, an engine builder may order 2 or 3 sets of pistons (12 or 18) to get all 6 pistons at exactly 4.000 inches, same with the bearings, he may use a combination of 2 or 3 sets to get the tolerances equal if all the crank journals have been turned to an equal diameter.
i wait to be corrected
methodwares said:
No, its not tight tolerances, from what I understand it to be is getting the measurements as equal as possible. For example, on a normal engine rebuild, if there is suppose to be say .01 inch tolerance between the piston and cylinder wall, then all the pistons will be measured and the corresponding cylinders will be honed to that tolerance. The piston diameters can vary, say the bore is 4.00 inches, the pistons may vary from 3.995 to 4.005 and as such the cylinder bores will vary by the same... though all will have the correct .01 tolerance. same goes for bearings, except the crank is usually turned to a certain size then using plasti-gage, the bearings are checked for a tolerance range.
for a bluprinted engine, say the S6, an engine builder may order 2 or 3 sets of pistons (12 or 18) to get all 6 pistons at exactly 4.000 inches, same with the bearings, he may use a combination of 2 or 3 sets to get the tolerances equal if all the crank journals have been turned to an equal diameter.
for a bluprinted engine, say the S6, an engine builder may order 2 or 3 sets of pistons (12 or 18) to get all 6 pistons at exactly 4.000 inches, same with the bearings, he may use a combination of 2 or 3 sets to get the tolerances equal if all the crank journals have been turned to an equal diameter.
Thats pretty much it John. The tolerances will generally come from the original BLUE PRINT drawings. The crank will also be checked for straightness and balanced. The rods are subjected to the same treatment and the block is line bored true to the crank plain. The liners are inserted 90 degrees true to the line bore and crank pins. The whole bottom end assembly wll be balanced. Its a very exacting and painstaking process and extremely labour intensive. Not something that any TVR dealer or likely workshop will do as part of a standard rebuild, the labour costs alone are just too prohibative.
Regards
G
i wait to be corrected
[/quote]This is how perceived the term "Blueprinting of an engine refers to a set of standard measurements or ‘blueprints’ produced for competition engines to keep the modifications as standard as possible. This leads to closely matched competition between competitors,"
Maybe i am wrong?
Interesting that we all have slightly different views!
Maybe i am wrong?
Interesting that we all have slightly different views!
hallsie said:
Does this mean that potentialy, a blue printed s6 engine will be, dare i say it 'bullet proof?'
or just more 'bullet proof' than a normal 2004-2006 engine?
stu
or just more 'bullet proof' than a normal 2004-2006 engine?
stu
A 2004-2006 blueprinted engine should be more robust than a none blue-printed 2004-2006 engine. Neither however, are idiot proof.
Boosted LS1 said:
Depending on work done a blueprinted engine should be smoother and make more power due it to having been built to the 'best' dimensions as opposed to average dimensions. I'm including weights here as well as clearances.
Boosted.
Boosted.
Old school used to suggest as much as 10% more power, geuss that depended on how bad the standard build was.
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