chriscook
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| posted on 26/11/07 at 09:17 PM |
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Sounds bodgy but...
Has been suggested that I change cams on my XE leaving the existing hydraulic followers in place.
Thoughts?
(Picked up some cheap Kent cams for my rebuild - only very mild though.)
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blakep82
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| posted on 26/11/07 at 10:17 PM |
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have a look at the qed web site, and sbd. one of them had some info on when you should start to look at solid lifters.
don't blame me if it all goes wrong! but mild tune should be ok from what i remember
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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chriscook
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| posted on 26/11/07 at 10:57 PM |
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Sorry. That's not what I'm asking. I know they are a hydraulic profile.
The question I am asking is whether it is ok to use used hydraulic followers with a new camshaft?
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blakep82
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| posted on 27/11/07 at 12:27 AM |
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oh, i see, i thought you meant swapping to solid lifters...
don't know. 
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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Werner Van Loock
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| posted on 27/11/07 at 08:01 AM |
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Well, from the burton power catalog it states that you should always change lifters with cams. And I also heard that on a 1.8zetec, when you go 2.0
zetec cams that you should change the lifters with it.
http://www.clubstylus.be
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Ivan
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| posted on 27/11/07 at 11:15 AM |
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The rule is always change lifters with cam as old lifters can significantly reduce cam life, so the choice is whether you want to gamble on having to
buy new cams and lifters down the road a bit.
So it's all down to simple economics.
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ned
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| posted on 27/11/07 at 11:21 AM |
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I'm running old lifters on my 220bhp xe. It's not run much but made good power on the rolling road. As long as they fill with oil and
quieten down ok after you start the engine they should be fine imho.
Ned.
beware, I've got yellow skin
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awinter
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| posted on 27/11/07 at 12:55 PM |
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milage
How many miles are you going to do a year?10000, change the lifters, 1000 leave em. Chances are you will never do the milage to wear the cams even if
things are not quite right. depends also on how much a set of replacments are, sometimes it pays to ask a few engine builders as they can often source
these things for way less than main dealer or other sources. Try Autosprint.
As long as the existing lifters are not worn and you run the new cams in according to instructions it should be fine. just make sure if you take the
lifters out of the head to put them back in the hole they came out of. If you mix em up it can cause wear on the lifters.
ta
Allan
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NS Dev
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| posted on 27/11/07 at 01:06 PM |
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Right, do the job right, DON'T use the old lifters AS THEY ARE........
Re-using them is fine, but they need a lap over before they run on the new/"different" cams.
You can do this with very fine wet and dry paper and wd40, on a sheet of glass. Stick the paper down abrasive side up on the glass by spraying it
generously with the wd40, then abrade the working face of the followers on it in a circular motion until the faces are an even grey all over.
Once this is done, they will bed into the new cams fine. I found this out a few years ago from Dave Andrews, and have since done this successfully on
two engines with good results.
Here's a quote from Dave Andrews website, hope he doesn't mind (doubt he will)
"Re-using followers
Although strictly speaking followers should be replaced when fitting new cams, this is largely unnecessary provided the followers are in good
condition. Whether or not you are converting the followers to solid operation they should be planished before fitting with new cams so that the
surface is perfectly flat and the new cam beds in correctly. The followers can be planished by placing some P240 wet/dry paper upturned on a truly
flat surface (a metal bench or small sheet of glass). The flat surface of follower is then rubbed over the surface of the abrasive paper with a slow
circular motion, lubricate the abrasive paper with WD40. Discard any followers which have heavy pitting or heavy rusting, these will not be suitable
for re-use. Light scuffing and other light radial marks can be removed by planishing. Inspect the surface of the follower regularly, and turn the
follower constantly. The planishing is complete when the face of the follower has a burnished appearance and none of the original wear marks or
scuffing is visible from any angle.
Below are pictures of a follower before and after planishing, note the radial marks and light scuffing on the follower surface before planishing, this
is normal."
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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MikeRJ
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| posted on 27/11/07 at 01:42 PM |
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I believe the correct term is 'linishing' as 'planishing' generaly invoves the use of a hammer
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