Engine woes part 3 - Cylinder head testing

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#-----Original Message-----
#From: [Email address removed] [mailto:[Email address removed]] On
Behalf Of Christopher Bell
#Sent: 22 June 2007 09:30
#To: [Email address removed]
#Subject: RE: [ELCO] Engine woes part 3
#
#I've been thinking about this too, and the only idea I've come up with
#is an internal flaw in the new head casting that is not visible from
#surface inspection.
#
#The only way I can think of testing for this is to block all the coolant
#holes in the head but one (ideally with rubber bungs, but I suppose
#candle wax, blu-tack or assistants' fingers would do), and then to
#pressurise the remaining one. Just blowing down it (or sucking) would
#do. If the air leaks away then there is a flaw.
Below are a couple of links from my favourites, both do head testing -
haven't used either but MSPD will probably get some work from me, I have
talked to them and the sound OK.
http://www.mspd-engines.co.uk/machining_page.htm
http://www.robwalkerengineering.co.uk/pressure_testing.html
The head needs to be tested at about 100 psi so fingers in holes won't work
- I have seen a photo of a rig but can't find it. Basically the head is
placed upside down and the apertures are blocked of with steel "fingers",
sort of like closing the holes on a flute, one as an air line attachment.
Malcolm Bagley
Stafford UK
FJ45 '75 & FJ45 '76
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17:32
 
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Malcolm
I had a feeling there would be a "proper" way of doing this. I was
looking for a zero-cost option, but I can see that you would have to
approach the mean effective pressure of the engine to get a definitive
result.
CB
| Below are a couple of links from my favourites, both do head testing -
| haven't used either but MSPD will probably get some work from me, I
have
| talked to them and the sound OK.
|
| http://www.mspd-engines.co.uk/machining_page.htm
|
| http://www.robwalkerengineering.co.uk/pressure_testing.html
|
| The head needs to be tested at about 100 psi so fingers in holes won't
work
| - I have seen a photo of a rig but can't find it. Basically the head
is
| placed upside down and the apertures are blocked of with steel
"fingers",
| sort of like closing the holes on a flute, one as an air line
attachment.
|
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