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I used Techline coatings, they stick very hard and was rock solid after heat treatment. These solvent based coatings are used in many race engines and many piston manufacturer offer coatings to "factory" manufactured pistons. If my pistons doesn't have steel upper ring land, maybe hard anodising could be good too, but these luckily have steel inserts so I go this way.
https://cimg7.ibsrv.net/gimg/www.off...33d501cf18.jpg Today I get heads from Tammer diesel Oy, they did awesome job! All 48 my own design aluminium bronze seat rings are in, 0.15mm press fit, assembled with liquid nitrogen. It's -193C cold and only way to get this large seats go in without trouble. https://cimg2.ibsrv.net/gimg/www.off...e3cb99872b.jpg https://cimg3.ibsrv.net/gimg/www.off...97a606453b.jpg https://cimg4.ibsrv.net/gimg/www.off...3608dec2f8.jpg Only small touch of seat machine needed after assembled CNC cut seat rings. All succeed better than I tought, luckily. https://cimg5.ibsrv.net/gimg/www.off...5db2ec149a.jpg https://cimg6.ibsrv.net/gimg/www.off...c3210c8204.jpg 1961 Soviet tank engine start looking somekind of high performance engine:cool-smiley-011: Next thing is make last valve seat angle to head by hand because it's so close to wall that seat Mira can't do that. I have tool for it. After that my friend will CNC mill fire ring grooves to heads, maybe in next week. 2.5mm fiber optic lazer cut copper fire rings go to groove so they have no change to blow out, should be bullet proof head gasket. Rubber O rings keep cooling fluid in engine. https://cimg7.ibsrv.net/gimg/www.off...fa046fffd5.jpg I coat camshaft bearing houses upper parts with TMLM, there is some friction in quad cam 48 valve engine, looking some efficiency to get BSFC and oil temp down and power up. Stay tuned. |
Originally Posted by ksalmine
(Post 4920647)
186mm stroke looks crazy! Nissan pistons compression ring is higher than transmash, it come pretty close to sleeve edge, but there are two millimeter safety, it's enough. |
Originally Posted by Markus
(Post 4921114)
The safety margin is about 1% of the stroke. Is that enough to allow for the rod and wrist pin to stretch?
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Cylinder head assembly is intresting.
https://cimg4.ibsrv.net/gimg/www.off...83ed456a7b.jpg Valve seat contact is good, contact widht is 2mm intake and 2.5mm exhaust. Should be good for this application, narrower surface flow more but wider cool valves better and in this heads, valve seats are not restrictor, I think more worse place for flow is valve stem area. https://cimg3.ibsrv.net/gimg/www.off...84d52df969.jpg Valve stems are coat PKSX powder, they come significant more slippery. https://cimg6.ibsrv.net/gimg/www.off...e15a3e2630.jpg 24 valves ready to going in place. https://cimg1.ibsrv.net/gimg/www.off...7c75765b89.jpg https://cimg2.ibsrv.net/gimg/www.off...da113d61e2.jpg Plywood flaps keeps valves not to drop when it's turned over. https://cimg9.ibsrv.net/gimg/www.off...e566543970.jpg 30x47x1mm axial bearing race fit straigt to under valve spring, they are hardened and allow valves rotate better. Original springs is on aluminium and friction keep them not to rotate, not good for lifters that are attached to valves. https://cimg0.ibsrv.net/gimg/www.off...dbb284a9c6.jpg New springs that I found stock from Germany spring shop are twice stiffer than original that had 22kg seat pressure and 45kg open pressure if I remember right, you can compress them fully by hand! New ones are 45kg seat and 90kg open. Grinded cams have 15mm lift, 2mm more than original. https://cimg6.ibsrv.net/gimg/www.off...50fc734bb7.jpg Retainers in place. https://cimg3.ibsrv.net/gimg/www.off...d54286121d.jpg Transmash have clever valve adjustment. Lifter (or follower) have M14x1 thread and are screwed straight to valve stem, valve stem end have triangle shape outer side and retainer is machined same shape. Retainer and valve stem are locked that way, spring push retainer against to face spline that locks valve clearance adjustment. Clearance adjust is easy, just push retainer little down by tool and rotate follower, one turn is one millimeter, easy and precice system. https://cimg9.ibsrv.net/gimg/www.off...7fd803e995.jpg Some of followers was too tight going in valves so I buy M14x1 thread tool, cut it with angle grinder and get adjustable tool. This way I can keep thread as tight as possible but take it down just little to be able to screw them place by hand. https://cimg2.ibsrv.net/gimg/www.off...eb5b7705b7.jpg MoS2 (TLML) coated followers, if coating last and do it job I will be happy! Cams are now nitrided after grinding, this should be good sliding pair and good efficiency. https://cimg1.ibsrv.net/gimg/www.off...abb53458af.jpg I make tool for milling machine to compress springs, It works pretty well. https://cimg8.ibsrv.net/gimg/www.off...e670376d4d.jpg Coarse valve clearance is set by caliber, it's now +-0.2mm, after engine is assembled I set lash better. https://cimg0.ibsrv.net/gimg/www.off...a9a4b4f65e.jpg First head ready after 6 hours assembly, tool manufacture take maybe hour from that. I think other head go in four hours, maybe. I have now pretty much all parts ready, I can maybe drive it in this summer.... |
How much squish?
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Man I SO much want to hear this beast fire up :ernaehrung004:
Unbelievable work sir. |
Originally Posted by Markus
(Post 4921677)
How much squish?
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Engine assembly go near catastrophe but luckily I find problems out before trouble.
https://cimg1.ibsrv.net/gimg/www.off...f0cf1f0716.jpg https://cimg3.ibsrv.net/gimg/www.off...de3f032528.jpg Heads I now near 3.5mm lower because new pistons have less compression height than original. Easiest way fix problem is take original 3mm head gasket out and replace it by fire rings. BUT I forgot to check guide pins end clearance. They bottom, I notice it luckily before tighten any head bolts, they will crack heads or cylinders when guides bottom. https://cimg0.ibsrv.net/gimg/www.off...003b36f557.jpg Fire rings and water passange O-rings in place, ready to lift head on. By the way head bolts are M23x1.5 thread, don't waste nut, you won't find new one in bolt store! Studs are 20mm minium diameter, made just right when thinned from the stem. Guess how much they strech when tightened to 300Nm? https://cimg5.ibsrv.net/gimg/www.off...b7b43b9e2b.jpg https://cimg9.ibsrv.net/gimg/www.off...27cd5f3053.jpg Next problem was valve spring seat pressure, it was too high and I had to raise camshafts to reduce spring force, yes this is Transmash thing, no else engine need adjustable camshaft height to put springs in check. No big deal, just make CAD file and cut spacer plates. First one support oil to cams so I spray head gasket spray to help sealing. https://cimg5.ibsrv.net/gimg/www.off...9304e57b8f.jpg All special builds go from problem to next problem. Good builders are just better to solve problems than amateurs. Camshaft bearings was out of line, miserable. I make line hone tools to fix this, valve grind paste with oil works well. https://cimg6.ibsrv.net/gimg/www.off...2fcfea25f9.jpg https://cimg7.ibsrv.net/gimg/www.off...34b40215c9.jpg https://cimg9.ibsrv.net/gimg/www.off...db0ef0b7fe.jpg Here you can see line was little off, these are little things that you hace to check, everything broke, size or wear out if some clearance or measure is wrong. https://cimg3.ibsrv.net/gimg/www.off...0d8b50eca4.jpg No we have wear test for TLML coating, it won't get off by grinding stuff, only there where aluminium grind away. Actually alumium grind easier than coating, it works amazing good! This engine is over 60 years old, someone may change cam stands without linehone or material just move and live, it is nature of metallurgy. But now same diameter than camshafts grinded steel bars rotate freely, I think they are ok now. https://cimg7.ibsrv.net/gimg/www.off...dda0aea418.jpg Modified 12 cylinder P3000 pump ready to assembly https://cimg2.ibsrv.net/gimg/www.off...fa4e066d9c.jpg Next thing to do is put vertical shafts and quad cams in and do timing and , valve lash and timing gear clearancing. Stay tuned. |
Man that's one weird engine..........:ernaehrung004:............what caused the damage to edge of the seat
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Amazing work
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