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Hello Marcel,
=20
Your engine has leaking valves.
It won=E2=80=99t get better from changing measurement procedures.
Maybe the seat is rough, or the valves bent, or offset .
Something to make sure about.
=20
Enlarging the valve leash could result in hammering everything dead in =
the valve train.
=20
Cheers
Chris
=20
Von: Fot <fot-bounces@autox.team.net> Im Auftrag von =
van.mulders.marcel--- via Fot
Gesendet: Samstag, 2. Mai 2020 14:43
An: fot <fot@autox.team.net>
Betreff: [Fot] Valve overlap and compression test
=20
A leaking test on my TR6 engine is showing a leaking exhaust valve on =
cyl no 1 (48% on the gauge of the device) and a leaking inlet valve on =
cyl no 2 (75%). Compression on cyl no1 is 9.5 bar and on cyl 2 it is 8 =
bar. The compression on the other cylinders is between 12 and 13.5 bar. =
This is with a race cam with a valve overlap of 110=C2=B0 (320-F grind). =
Because of the high overlap, the piston has risen a lot before the inlet =
valve is closed, so I did the compression test again, but with a valve =
lash of 2.5mm/0.1" : compression went from 9.5 bar to 14.5 on cyl no 1 =
and from 8 bar to 15 on cyl no 2. With this valve lash, the compression =
on the other cylinders went up to 16 - 18.5 bar. Of course, when the =
engine is running at high rpm, a lot of valve overlap is necessary for =
best cylinder filling, but I wonder if 110=C2=B0 isn't too much?? The =
recommended valve lash is 0.40mm/0.016" when the rocker ratio is =
1.45(0.43mm/ with my 1.55 roller rockers). Would it be risky to set the =
valve lash at some 0.05mm/0.002" higher?
PS : is it common practice to set the valve lash at a couple of mm to =
perform a compression test, because it seems that the valve lash has a =
lot of influence on the result when testing a race camshaft?
Marcel
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link=3D"#0563C1" vlink=3D"#954F72"><div class=3DWordSection1><p =
class=3DMsoNormal><span lang=3DDE>Hello Marcel,<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DDE><o:p> </o:p></span></p><p =
class=3DMsoNormal>Your engine has leaking valves.<o:p></o:p></p><p =
class=3DMsoNormal>It won=E2=80=99t get better from changing measurement =
procedures.<o:p></o:p></p><p class=3DMsoNormal>Maybe the seat is rough, =
or the valves bent, or offset .<o:p></o:p></p><p =
class=3DMsoNormal>Something to make sure about.<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>Enlarging =
the valve leash could result in hammering everything dead in the valve =
train.<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>Cheers<o:p></o:p></p><p =
class=3DMsoNormal>Chris<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span lang=3DDE>Von:</span></b><span =
lang=3DDE> Fot <fot-bounces@autox.team.net> <b>Im Auftrag von =
</b>van.mulders.marcel--- via Fot<br><b>Gesendet:</b> Samstag, 2. Mai =
2020 14:43<br><b>An:</b> fot =
<fot@autox.team.net><br><b>Betreff:</b> [Fot] Valve overlap and =
compression test<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p> </o:p></p><div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black'>A=
leaking test on my TR6 engine is showing a leaking exhaust valve on cyl =
no 1 (48% on the gauge of the device) and a leaking inlet valve on cyl =
no 2 (75%). Compression on cyl no1 is 9.5 bar and on cyl 2 it is 8 bar. =
The compression on the other cylinders is between 12 and 13.5 bar. This =
is with a race cam with a valve overlap of 110=C2=B0 (320-F grind). =
Because of the high overlap, the piston has risen a lot before the inlet =
valve is closed, so I did the compression test again, but with a valve =
lash of 2.5mm/0.1" : compression went from 9.5 bar to 14.5 on cyl =
no 1 and from 8 bar to 15 on cyl no 2. With this valve lash, the =
compression on the other cylinders went up to 16 - 18.5 bar. Of course, =
when the engine is running at high rpm, a lot of valve overlap is =
necessary for best cylinder filling, but I wonder if 110=C2=B0 isn't too =
much?? The recommended valve lash is 0.40mm/0.016" when the rocker =
ratio is 1.45(0.43mm/ with my 1.55 roller rockers). Would it be risky to =
set the valve lash at some 0.05mm/0.002" =
higher?<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black'>P=
S : is it common practice to set the valve lash at a couple of mm to =
perform a compression test, because it seems that the valve lash has a =
lot of influence on the result when testing a race =
camshaft?<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black'>M=
arcel<o:p></o:p></span></p></div></div></div></body></html>
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_______________________________________________
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http://www.fot-racing.com
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