Comments on: Ferguson FE35 Compression Test http://vintagetractorengineer.com/2009/05/ferguson-fe35-engine-compression-tes/ Thu, 29 Jul 2010 18:39:58 +0000 http://wordpress.org/?v=2.9.1 hourly 1 By: heskencren http://vintagetractorengineer.com/2009/05/ferguson-fe35-engine-compression-tes/comment-page-1/#comment-663 heskencren Mon, 01 Mar 2010 09:25:44 +0000 http://vintagetractorengineer.com/?p=785#comment-663 Are we all measuring the compression in the same way? That is, with our non-return valve in the same place so we trap the same tdc volume as the next guy???? On high CR engines lost volume causes a more significant error. I have now measured the compression on my tired old 23C. I get 380,440,420,420 psi. Isn't that something like 28:1 CR? Is this not way above spec? I have measured this with a Gunson hi-gauge. The threaded bit of the tube that normally goes down a spark plug hole just fits down the injector nozzle counterbore and the o-ring just about goes down too. The plain shank doesn't but that's good as it holds the o-ring down. (Ok the couterbore may be a bit rough and the corner may mash the o-ring after a few goes but I get the numbers.) This puts the non-return valve as close to the true volume as possible as the nozzle insertion depth is similar. This was held down with a modified injector clamp. A vee was cut in the pad to allow the hi-gauge hose thru whist keeping the tube perpendicular and a slotted m16 nut used as a spacer under that. The nut may splay open and ride down the plain shank of the tube so improvise further! ****WARNING**** The FSD of the gauge was exceeded so i put one with 600psi FSD intead. Keep volume of adaptors as small as possible to reduce the number of compression strokes required to reach a steady reading. ****ANOTHER WARNING**** If the hardware explodes or pops out then bits may hit you so take precautions. How is everyone else doing it? Can we all agree on a standard (pun not intended) compression test method? SO.. I get bad starting. I also get bad idle smoke and lumpyness. A bit like the "before" 23C on the DVD. Can I rule out bad compression? Rather not remove the head unless i have to. Are we all measuring the compression in the same way? That is, with our non-return valve in the same place so we trap the same tdc volume as the next guy???? On high CR engines lost volume causes a more significant error.
I have now measured the compression on my tired old 23C. I get 380,440,420,420 psi. Isn’t that something like 28:1 CR? Is this not way above spec?

I have measured this with a Gunson hi-gauge. The threaded bit of the tube that normally goes down a spark plug hole just fits down the injector nozzle counterbore and the o-ring just about goes down too. The plain shank doesn’t but that’s good as it holds the o-ring down. (Ok the couterbore may be a bit rough and the corner may mash the o-ring after a few goes but I get the numbers.) This puts the non-return valve as close to the true volume as possible as the nozzle insertion depth is similar. This was held down with a modified injector clamp. A vee was cut in the pad to allow the hi-gauge hose thru whist keeping the tube perpendicular and a slotted m16 nut used as a spacer under that. The nut may splay open and ride down the plain shank of the tube so improvise further!
****WARNING**** The FSD of the gauge was exceeded so i put one with 600psi FSD intead. Keep volume of adaptors as small as possible to reduce the number of compression strokes required to reach a steady reading.
****ANOTHER WARNING**** If the hardware explodes or pops out then bits may hit you so take precautions.
How is everyone else doing it?
Can we all agree on a standard (pun not intended) compression test method?

SO.. I get bad starting. I also get bad idle smoke and lumpyness. A bit like the “before” 23C on the DVD. Can I rule out bad compression? Rather not remove the head unless i have to.

]]> By: P Comiskey http://vintagetractorengineer.com/2009/05/ferguson-fe35-engine-compression-tes/comment-page-1/#comment-617 P Comiskey Tue, 02 Feb 2010 21:49:21 +0000 http://vintagetractorengineer.com/?p=785#comment-617 Re 4cly 35 possible reason for low compression could be valves seated to low in cly head might need a few inserts fitted? Re 4cly 35 possible reason for low compression could be valves seated to low in cly head might need a few inserts fitted?

]]> By: Vintage Tractor Engineer http://vintagetractorengineer.com/2009/05/ferguson-fe35-engine-compression-tes/comment-page-1/#comment-583 Vintage Tractor Engineer Tue, 12 Jan 2010 22:17:23 +0000 http://vintagetractorengineer.com/?p=785#comment-583 Hi Everyone, More info here, from Dave's 23C engine. http://vintagetractorengineer.com/forums/topic.php?id=157 Steve. Hi Everyone,

More info here, from Dave’s 23C engine.

http://vintagetractorengineer.com/forums/topic.php?id=157

Steve.

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