What does hf stand for????
25 April 2012, 10:47 AM
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What does hf stand for????
Ive just broke a closed block and the pistons has hf on the back whats that stand for??? they any good or just standard
25 April 2012, 12:50 PM
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I dont think it means forged, having a look up on google its a way of finding the displacement, would need to find something better but here is a quick search result.
Guestimation may show that there are different values of HF?
http://science.jrank.org/pages/3616/...integrals.html
Tony
Guestimation may show that there are different values of HF?
http://science.jrank.org/pages/3616/...integrals.html
Tony
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25 April 2012, 01:01 PM
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As said before manufacturing
Piston stroke x internal diam x internal combustion x force x pressure
Engineers measure irregularity by means of hf with additions of mathematics
Hf is stamped if the piston is passed
Additional letters can also be added if thr are flaws
Any 1 ?
Piston stroke x internal diam x internal combustion x force x pressure
Engineers measure irregularity by means of hf with additions of mathematics
Hf is stamped if the piston is passed
Additional letters can also be added if thr are flaws
Any 1 ?
25 April 2012, 02:56 PM
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Niceone guys there forged then as have no cross hatching just smooth.
next question then piston rings im guessing best to change even if there not to Sharpe?
next question then piston rings im guessing best to change even if there not to Sharpe?
25 April 2012, 03:20 PM
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As said before manufacturing
Piston stroke x internal diam x internal combustion x force x pressure
Engineers measure irregularity by means of hf with additions of mathematics
Hf is stamped if the piston is passed
Additional letters can also be added if thr are flaws
Any 1 ?
Piston stroke x internal diam x internal combustion x force x pressure
Engineers measure irregularity by means of hf with additions of mathematics
Hf is stamped if the piston is passed
Additional letters can also be added if thr are flaws
Any 1 ?
25 April 2012, 04:09 PM
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thought it might be for 'Hard Boiled'.
Subaru must be very confident with their pistons if they actually cast or forge 'HF' on those pistons before they are thoroughly mathematically inspected.
I suppose an HB2 piston may be not quite hard boiled, eg. still a bit runny in the middle.
Subaru must be very confident with their pistons if they actually cast or forge 'HF' on those pistons before they are thoroughly mathematically inspected.
I suppose an HB2 piston may be not quite hard boiled, eg. still a bit runny in the middle.
25 April 2012, 04:27 PM
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Yes you've got it Qwertyco
Finding the value of displacement is approximated by the area HF or other variants A A1 2H N B or H it corresponds to the number of rectangles in the math design
Boiled egg or not Subaru know the integrity math of piston design.. Thrs a 1000000 & 1 other factors wich come into play
Finding the value of displacement is approximated by the area HF or other variants A A1 2H N B or H it corresponds to the number of rectangles in the math design
Boiled egg or not Subaru know the integrity math of piston design.. Thrs a 1000000 & 1 other factors wich come into play
25 April 2012, 08:59 PM
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Ha ha , u gotta luv this site
I dunno , maybe peel , creep , burst , vacuum ,leak,dye,head space,pressure ,or differential ..
Or you could wind your neck back in & pedal ur *** down to C engineering & ask them In person
Let us know the answer tho
I dunno , maybe peel , creep , burst , vacuum ,leak,dye,head space,pressure ,or differential ..
Or you could wind your neck back in & pedal ur *** down to C engineering & ask them In person
Let us know the answer tho
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