austin man
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| posted on 3/12/14 at 10:31 PM |
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Silvertop zetec to ST170
Thinking of replacing the engine in the MK, have seen anST 170 engine for sale would this be a direct swap for the silvertop zetec engine or is there
much work involved
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
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Dusty
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| posted on 3/12/14 at 11:55 PM |
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Idler for waterpump belt, different alternator bracket and a bit of fettling to match the inlet ports is about all. Can be some variation in the
engine mount bolt holes but I got away with just a drill and file and re-used the old mounts. Easy swap.
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kingster996
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| posted on 4/12/14 at 07:28 AM |
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And some way to run the vvt. There's a bolt on box available to
control it.
Also, you'll need the windage tray from the Silvertop when you swap sumps (assuming yours is a lowered one)
I'll be doing this - starting with a silvertop then putting in the ST170 later (long story).
[Edited on 4/12/14 by kingster996]
I used to be indecisive, but now I'm not so sure
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coozer
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| posted on 4/12/14 at 01:53 PM |
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I had to make a new nearside engine mount, holes in the block are a little bit different. Water pump runs the other way so as said an idler for the
belt. I used the ac pump bracket to mount my alternator.
I've got plenty pics, giz a shout if you need anything.
From the off I used the zx9r carbs off the silvertop, and ran the vvt off the megajolt. 166bhp without any jetting up (which it needed).
1972 V8 Jago
1980 Z750
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The Knobs
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| posted on 8/12/14 at 10:08 PM |
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Is this a worthwhile swap as I have a silvertop with carbs and megajolt?
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kingster996
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| posted on 8/12/14 at 11:24 PM |
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It's debatable really.
The ST170 is a more developed engine with uprated rods, pistons and a better flowing head. So in theory you should get more out of it than the
silvertop.
But the VVT throws a bit of a spanner in the works with an extra bit of electronics required to make the most out of it.
So you might be able to gain as much power per £ by doing some work on your existing engine.
One of the blokes on wscc has had good results with his carb'd ST and the vvt controller box, so it is very doable - but you might need to
factor in some mapping time to get it right.
Personally, as I have both engines sat in my garage I'm using the silvertop to get my kit through IVA without a cat as it is already mapped and
thus pretty much ready to go. Then next season I will probably put the ST170 in, but might look at some head work and see what can be done to up the
power a bit (cams too perhaps). But that's a way off yet and it all could change!
I used to be indecisive, but now I'm not so sure
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The Knobs
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| posted on 9/12/14 at 08:49 PM |
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Thought as much. Problem is my last Striker was a Rotrex charged 20v Yota with 272 bhp and without going down the sc route I think I will be
disappointed. Built engines before that gained 15 to 20 bhp and tbh was not really worth the hastle. May just look out for a head and some cams on the
second hand market or may have to wait til sc money is available.
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