stevegough
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 posted on 27/4/09 at 12:13 PM |
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Using a comp tester on Red Top !
I am going to test my second hand red top for compression tomorrow.
I am wondering about how to go about it, and whether it needs oil in it first - after talking to a friend at work - he says don't crank it, even
by hand without first putting some oil in - I was going to use the starter motor !
He also suggests it might be an idea to fill it with 'flushing' oil first.
All sounds reasonable advice !  
1....Where do I get 'flushing' oil ?
2.....How much do I put in ?
3.....Crank by hand or starter ?
4.....What pressures should I be looking for?
5.....Do I know what I am doing?
Over to you guys .... (and gals!)
Luego Locost C20XE.
Build start: October 6th 2008.
IVA passed Jan 28th 2011.
First drive Feb 10th 2011.
First show: Stoneleigh 1st/2nd May 2011.
'Used up' first engine may 3rd 2011!
Back on the road with 2nd engine may 24th
First PASA mad drive 26/7/11
Sold to Mike in Methyr Tydvil 19/03/14
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BenB
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| posted on 27/4/09 at 12:18 PM |
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Has it got any oil in it? If it's completely empty I'd be wary. You'll have to turn it over a few times for each cylinder to get a
stable reading, if the bottom end isn't lubricated during that time you could knacker it quite quickly.
I very much doubt you'll get it up to max compression by hand
You just want the pressures to be similar in all cylinders.
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blakep82
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| posted on 27/4/09 at 12:19 PM |
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if there's no oil in and the cylinders are dry, air will leak past the piston rings. oil helps that seal, so you must have oil in there,
especially if turning over on the starter!
________________________
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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Mr Whippy
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| posted on 27/4/09 at 12:25 PM |
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if the engine has no oil then fill it, take out the spark plugs and spin it on the starter till the engine speeds up, meaning that the oil has reached
the bearings
Then without putting oil down the cylinders or refitting the spark plugs, take a reading of each cylinder pressure and write it down.
Then add a table spoons worth of engine oil just before testing each cylinder to see how much the pressure goes up
If the pressure of one cylinder goes massively up or if the general overall pressure without the oil is very low but is fine with the oil then its got
worn rings either on one cylinder or the whole lot
note though that the gauge will be calibrated for a warm engine so the reading will be at the bottom end of the green bar
[Edited on 27/4/09 by Mr Whippy]
Fame is when your old car is plastered all over the internet
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stevegough
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| posted on 27/4/09 at 12:38 PM |
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Thanks for the repies so far - just to clarify, the engine has been drained of oil, + water for transit - but there will still be some residual in
there - ie. nothing has been taken apart - yet.
Luego Locost C20XE.
Build start: October 6th 2008.
IVA passed Jan 28th 2011.
First drive Feb 10th 2011.
First show: Stoneleigh 1st/2nd May 2011.
'Used up' first engine may 3rd 2011!
Back on the road with 2nd engine may 24th
First PASA mad drive 26/7/11
Sold to Mike in Methyr Tydvil 19/03/14
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stevegough
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| posted on 27/4/09 at 03:57 PM |
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how about the flushing oil - anyone know if it is any good ?
Luego Locost C20XE.
Build start: October 6th 2008.
IVA passed Jan 28th 2011.
First drive Feb 10th 2011.
First show: Stoneleigh 1st/2nd May 2011.
'Used up' first engine may 3rd 2011!
Back on the road with 2nd engine may 24th
First PASA mad drive 26/7/11
Sold to Mike in Methyr Tydvil 19/03/14
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chrsgrain
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| posted on 27/4/09 at 04:36 PM |
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I was advised by a Red Top engine specialist, just to put the cheapest tesco oil you can find in for a few hundred miles, then change it for something
decent - rather than using flushing oil...
CHris
Spoing! - the sound of an irony meter breaking...
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britishtrident
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| posted on 27/4/09 at 06:29 PM |
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I would stay away from flushing oil until you are ready to run the engine and drain and change the oil even them probably best to use a flushing
afdditive
Morrisions petrol forecourts sell full 5 litre size Havoline 5W/30 fully synthetic engine oil very very cheaply.
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stevegough
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| posted on 28/4/09 at 08:54 PM |
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Many thanks for the info and help, guys!
Got some cheap ASDA 20/50 oil £6.
Got battery charging overnight.
Will spin it tomorrow, all being well.
Will it be any good???.jpg)
Luego Locost C20XE.
Build start: October 6th 2008.
IVA passed Jan 28th 2011.
First drive Feb 10th 2011.
First show: Stoneleigh 1st/2nd May 2011.
'Used up' first engine may 3rd 2011!
Back on the road with 2nd engine may 24th
First PASA mad drive 26/7/11
Sold to Mike in Methyr Tydvil 19/03/14
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stevegough
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 posted on 29/4/09 at 04:43 PM |
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Further to the above topic, I have done the compression test and, apart for a very bad start - the cheap £8.99 Compression Tester firstly not fitting
together properly so it leaked air - and then the hose split when I had 'done' 3 cylinders all showing 75 to 80 psi !
I had to get another from Halfords (gunsons) - this was great. - Cyls 1,2 and 4 were 200 psi and cyl 3 was 195.
Then, following Scott's advice (Mr Whippy), I put a little oil in each cyl and retested - there was two cyls that went up 5psi or so (not no.3)
but that was that.
I then drained the cheap oil out again - you know, bit on my hand, down side of the jug, on the floor - It was surprising how black it was!
Bottom Line is - good result I think?
AND - DONT BUY THE CHEAP TESTER SHOWN BELOW!!
 
Luego Locost C20XE.
Build start: October 6th 2008.
IVA passed Jan 28th 2011.
First drive Feb 10th 2011.
First show: Stoneleigh 1st/2nd May 2011.
'Used up' first engine may 3rd 2011!
Back on the road with 2nd engine may 24th
First PASA mad drive 26/7/11
Sold to Mike in Methyr Tydvil 19/03/14
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omega 24 v6
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| posted on 29/4/09 at 07:09 PM |
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The readins are quite Low IMHO. You did hold the throttle wide open whilst doing the test didn't you ( You should have).
At least all the cyls are quite balanced. Good luck with it.
If it looks wrong it probably is wrong.
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stevegough
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| posted on 29/4/09 at 07:59 PM |
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no, didn't touch the throttle - engine is on a stand, cranked over with the starter motor only.
Luego Locost C20XE.
Build start: October 6th 2008.
IVA passed Jan 28th 2011.
First drive Feb 10th 2011.
First show: Stoneleigh 1st/2nd May 2011.
'Used up' first engine may 3rd 2011!
Back on the road with 2nd engine may 24th
First PASA mad drive 26/7/11
Sold to Mike in Methyr Tydvil 19/03/14
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omega 24 v6
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| posted on 29/4/09 at 08:11 PM |
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Try it again with the throttle open IIRC Mines were around 200psi ( an XE like yours as well)
If it looks wrong it probably is wrong.
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stevegough
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| posted on 29/4/09 at 08:19 PM |
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I don't think you read my post properly? - the readings I got with the non-faulty test gauge were 200 on three cyls and 195 on the fourth.
Steve.
Luego Locost C20XE.
Build start: October 6th 2008.
IVA passed Jan 28th 2011.
First drive Feb 10th 2011.
First show: Stoneleigh 1st/2nd May 2011.
'Used up' first engine may 3rd 2011!
Back on the road with 2nd engine may 24th
First PASA mad drive 26/7/11
Sold to Mike in Methyr Tydvil 19/03/14
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omega 24 v6
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| posted on 29/4/09 at 08:25 PM |
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LOL never noticed that
Looks like you've got a good un then.
If it looks wrong it probably is wrong.
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