Detonation will kill a turbo engine really quickly.
And running standard compression it’s going to detonate at anything above a
tiny level of boost.
What boost were you running ?
I assume it has a aftermarket ecu ?, does it have a knock sensor on it ?
Not really heard of sleeving being used on a cast iron block but i guess it’s
possible.
The joint between the sleeve and the block may reduce it’s heat transfer
ability which is of course just what you don’t want.
Jim
From: Nigel Plant
Sent: Friday, March 26, 2021 5:05 PM
To: quantumowners@googlegroups.com
Subject: Re: [Quantum Owners] 2L Zetec Blacktop Pistons
Silvertop oversize pistons are readily available.
I think mine failed due to about 20 track days approx 10 with turbo and too
much fuel at start up. I also ran with standard compression and there was
significant evidence of pre detonation particularly on the #3 piston which
failed. However I dont think it was significant enough to be the cause. I dont
yet have the piston, so haven't inspected it in detail.
I do have a second engine but that has worn bores. One option is to use that
but with the block sleeved so I can reuse those pistons. Does anyone have
experience of sleeving, I dont, so am hesitant to go that route.
On Fri, 26 Mar 2021, 16:37 list...@liberator-systems.co.uk,
<lists...@liberator-systems.co.uk> wrote:
I was planning to drop a 2.0l blacktop and possibly turbo into my saloon.
This piston availablity issue is making me think twice. Is it the same problem
for the old silvertop? How many manufacturers are there for standard type
pistons? Wondering how the engine reconditioning businesses source their
pistons.
John
On Thursday, 25 March 2021 at 18:36:23 UTC nige...@gmail.com wrote:
Thanks Jim, will respond to your other later, some interesting points!
Oversize pistons for blacktop are quoted for on plenty of web sites, but are
never available. Supplier calls the manufacturer and they all come back with
same story.
Regards
On Thu, 25 Mar 2021, 16:23 Jim Hearne, <j...@quantums.info> wrote:
As you say, i don’t think Ford sells pistons for a Black top Zetec as a
spare, they want you to replace the whole bottom end.
The Zetec SE is the same.
Jim
From: susanandmartin
Sent: Thursday, March 25, 2021 3:28 PM
To: quantu...@googlegroups.com
Subject: RE: [Quantum Owners] 2L Zetec Blacktop Pistons
Not that it helps with your quest, but (hopefully) of interest.
When I was working at Ford we had an engine being tested for cold start
durability at a University. As proof (if it was ever needed) that starting an
engine repeatedly from cold with a fuel-enriched intake mixture would wreck an
engine, there was a need for new pistons after several months and x000’s of
start procedures. When trying to source new pistons, however, it was found they
were not listed as a spare and could only be bought with an engine block. As
this wouldn’t help our engine block durability testing, great discussions
ensued taking several hours and it was agreed some pistons could be supplied
direct from the assembly line (maybe one car was released without pistons? 😊).
This is a good example of how Ford goes to great lengths with their testing
(and probably other manufacturers do as well).
Martin Scott
Sent from Mail for Windows 10
From: Nigel Plant
Sent: 25 March 2021 12:15
To: Quantum Owners Group
Subject: [Quantum Owners] 2L Zetec Blacktop Pistons
Probably one that's right up Jim's street. Does anyone have the Ford
specification for 2L Zetec blacktop pistons. Need gudgeon pin diameter,
compression height essentially all the key dimensions. I have broken a piston
on my Xtreme turbo such that it needs reboring and cannot get any standard but
oversize pistons. Am also told that Nural and Mahle have no production plans
to manufacture any. I can get forged pistons and rods, which would be better
performance wise but didn't want to drop compression to 8:1 or fork out £1200.
9:1 is my ideal for the power I want. I have found a custom piston manufacture
for forged pistons alone, but they require a piston (no problem) and the key
specs.
For information, I have learnt one interesting point that people may find
useful. Although the silvertop and black top have different length conrods
(ctr to ctr) and different compression heights. The combined total of conrod
length and compression height for the silvertop and blacktop are the same,
meaning a set of silvertop conrods and pistons can be used to replace the
blacktop ones.
Thanks for any help on the specs.
Nigel Plant
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