APR
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| posted on 2/11/05 at 08:28 PM |
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zetec black or silver top
has any one used the 2.0l zetec black top and are these better for bhp than the silver top when using throttle bodies. any info on the up/down side of
them
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SeaBass
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| posted on 2/11/05 at 08:46 PM |
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One downside of the blacktop is the you can't change the water pump to run the 'correct' way for a simple aux belt setup - you have
to run serpentine and makeup an idler normally. Other than that don't know that much. I have a blacktop sitting at the mo gathering dust for use
in the future. I've found the exhaust and inlet manifolds to be the same but others claim differences...
Cheers
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stevebubs
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| posted on 2/11/05 at 08:46 PM |
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Has been covered elsewhere
Primary differences that affect fitting are:
sump is 2 piece not 1
water pump goes the opposite way to the crank on *all* blacktop varieties
Blacktop is supposedly better for approx 10BHP in std trim due to the use of
solid lifters
teflon-lined pistons
There's also a bit more meat between the bores if you want to spend $$ on an custom build.
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stevebubs
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| posted on 2/11/05 at 08:51 PM |
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quote:
Originally posted by SeaBass
One downside of the blacktop is the you can't change the water pump to run the 'correct' way for a simple aux belt setup - you have
to run serpentine and makeup an idler normally. Other than that don't know that much. I have a blacktop sitting at the mo gathering dust for use
in the future. I've found the exhaust and inlet manifolds to be the same but others claim differences...
Cheers
I beg to differ on this.
My pump turns the right way, but it took some effort. There's a place in the US who makes water pump impellors that are a mirror image of the
original. This sorts any cavitation issues with the centrifugal force.
You then just need to fit a suitable pulley. I got a local engineering place to make up an adapter plate to allow a pulley from a 1.8 silvertop to
simply bolt up.
Alternatively, Westfield are now supposedly doing an idler pulley to maintain the belt pattern.
Details of both solutions Here
[Edited on 2/11/05 by stevebubs]
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Big Stu
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| posted on 2/11/05 at 10:39 PM |
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My solution was to mount the altenator facing the 'wrong' direction so that a normal pump can be used.
Sump is a two piece design which means it can be shorted easier.
Manifolds all seem to be the same.
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APR
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| posted on 2/11/05 at 10:56 PM |
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thanks for the advise. what bhp have people made from black tops
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Big Stu
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| posted on 3/11/05 at 02:22 AM |
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A two litre, with standard cams, decent ignition, and twin 45's should be good for about 160. You will get a little more with throttle bodies.
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MikeRJ
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| posted on 3/11/05 at 10:19 AM |
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quote:
Originally posted by stevebubs
I beg to differ on this.
My pump turns the right way, but it took some effort. There's a place in the US who makes water pump impellors that are a mirror image of the
original. This sorts any cavitation issues with the centrifugal force.
Won't the pump housing be the wrong shape for the implellor though? I mean the outlet for a centrifugal pump would normaly be exiting in the
direction of travel of the tips of the impellor. Having the outlet pointing "backwards" must surely reduce pump efficiency quite
significantly?
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stevebubs
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| posted on 4/11/05 at 09:44 AM |
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In theory yes - efficiency is reduced. However it doesn't seem to be causing a problem - and I've had the car out on days where
temperatures are 30+C without any problems.
If you want to go the whole hog, you can replace the mechanical water pump system with an electronic one for about £200.
S
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zetec
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| posted on 4/11/05 at 04:49 PM |
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I wouldn't worry about which to use. the big question for most people is the year it was made for SVA test.
If that is not an issue then the earlier engine seems better catered for for fitting into RWD cars. The sump on the earler engine is easier as it does
not need to be chopped about to get the starter to fit.
" I only registered to look at the pictures, now I'm stuck with this username for the rest of my life!"
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