totti
Posted a lot
Posts: 1,153
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Apr 30, 2022 19:35:59 GMT
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Hi! My Volvo has a piston failure after only 20000mls.....    In 2016 the engine got a rebore and a set of new EGGE/USA pistons...the only ones available for old Volvo B4b or B14a engines.OEM pistons are from german brand Kolbenschmidt or Mahle...but they didn't make them anymore.THEY last likely around 120000mls... JP pistons from Australia offer a set of pistons for B14a engines....but i don't know ifthey are from better quality.... I don't want to use that EGGE scrap again.....i spoke to some people at a german Volvo forum who have the same problems.... Mostly after 30000km of use the pistons gave up.... Does anybody know something about JP Pistons? Greet |
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65 'Ford Taunus 17m
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63' Ford Taunus Transit 1250
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64'Ford Cortina 1500 deluxe
57'Volvo PV 444 Califonia
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88'MZ ETZ 250
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stealthstylz
Club Retro Rides Member
Posts: 14,829
Club RR Member Number: 174
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Apr 30, 2022 20:57:15 GMT
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I've used them about 3 years ago as a customer supplied them. They were pretty bad, all over size wise, as far as I know they're still going strong though.
Have you found the source of your failure? Can't tell exactly but looks like detonation or foreign object damage.
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melle
South West
It'll come out in the wash.
Posts: 1,983
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Apr 30, 2022 21:14:06 GMT
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Sorry to hear about your woes totti , that's pretty annoying! I had a set of JP pistons fitted to a 1.5 Cologne V4 by an automotive machine shop 15 years ago, I haven't heard any complaints from them back then (they were probably just as polite as stealthstylz not to moan about the quality of parts I supplied  ). I've still not run the engine in earnest due to an issue that I only recently managed to diagnose (valve spring just hitting the oil deflection plate resulting in a horrible knock), so can't comment on durability. |
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www.saabv4.com'70 Saab 96 V4 "The Devil's Own V4" '77 Saab 95 V4 van conversion project '88 Saab 900i 8V
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820
South East
Posts: 790
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Is it the correct head gasket? is the gasket bore diameter meant to be that much larger than the bore? is it the same on the cylinder head?
Looks like some small marks at 3 oclock on the piston too, has something been in there and caused the damage rather than piston at fault? any damage to the combustion chamber?
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Last Edit: May 1, 2022 9:06:41 GMT by 820
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totti
Posted a lot
Posts: 1,153
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Is it the correct head gasket? is the gasket bore diameter meant to be that much larger than the bore? is it the same on the cylinder head? Looks like some small marks at 3 oclock on the piston too, has something been in there and caused the damage rather than piston at fault? any damage to the combustion chamber? Pulled the pistons today.....   Another ring is brocken on the piston next to this desaster.... Never seen such a piston befor.... Greet |
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65 'Ford Taunus 17m
66' Ford Taunus 17m Turnier
73' Ford Taunus
63' Ford Taunus Transit 1250
72'Ford Escort 2000cc
71'Ford Escort 1700 4 door
89'Ford Escort Express
87'Ford Fiesta Diesel
64'Ford Cortina 1500 deluxe
57'Volvo PV 444 Califonia
54'Peugeot 203 Commerciale
2004 Harley Davidson Fat Boy
78'Zündapp ZR 20
88'MZ ETZ 250
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Blimey…..those are torched! 😳looks like you need to turn down the nitrous a bit! 😛
Seriously though, are both those pistons fed by the same carb? The pistons may not be the most robust but those look like they’ve seen detonation maybe caused by one carb being lean?
Is it a possible to find a piston intended for a different engine with dimensions that are close enough? For example, Mahle pistons intended for VW are sometimes used in Triumph engines because they are stronger.
Nick
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1967 Triumph Vitesse convertible (old friend)
1996 Audi A6 2.5 TDI Avant (still durability testing)
1972 GT6 Mk3 (Restored after loong rest & getting the hang of being a car again)
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Would it be easier to get a B18, or is that not allowed under the TUV regs?
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Last Edit: May 1, 2022 20:46:49 GMT by Paul H
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stealthstylz
Club Retro Rides Member
Posts: 14,829
Club RR Member Number: 174
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Looking at the state of the CROWNs it's probably the result of the excessive oil consumption/deposits on the piston CROWN causing glowing/hot spots which have broken the boundary layer and allowed combustion heat to directly effect the aluminium.
Either that or the ring grooves aren't machined deep enough/rings too deep and there has been excessive friction on the cylinder walls.
Either way it looks pretty bad for a fairly fresh engine, old engines do tend to get coked up quicker than modern but that looks excessive even by those standards.
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). I've still not run the engine in earnest due to an issue that I only recently managed to diagnose (valve spring just hitting the oil deflection plate resulting in a horrible knock), so can't comment on durability.
