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Fellas,
Sounds like we have the bearing cap strap issue resolved...who is up for an=
other mystery? Has anyone ever has their timing chain skip a tooth??
Final race on Saturday at the Turlkey Bowl this weekend at Summit Point. Tr=
iumph Spitfire..1296 engine. Double roller chain set. Car was running well =
all weekend, was out twice earlier that day. We leave false grid for the to=
set up for the first lap and I begin to accelerate. All of a sudden the ca=
r just dies and I coast off the track even before turn one. On the side of =
the track I couldn't start the car. In my mind I'm thinking my perrtonix di=
stributor just took a shit. Got towed in and all I'm thinking in pertronix.=
I swap in a points distributor and nothing. Perhaps my coil? Swap in a new=
coil. Nothing. Plugs perhaps? Swap in a good set of NGKs. Nothing. Not eve=
n a cough out of the engine. By this time I had run down the battery from t=
rying to start it so much. At this point I was jumping the racecar battery =
from my Tundra truck battery thinking perhaps a weak spark from a shot batt=
ery. Nothing. Was getting plenty of fuel because the plugs were wet. I even=
pulled and cleaned all the jets out of the Weber 45 DCOE just to make sure=
I was getting correct fuel. Fuel. Air. Spark. COMPRESSION. This next day (=
this morning) I did a compression test at the track. 80/70/70/70. What the =
heck? Thats not a blown head gasket..the cam HAS to be out of timing. I spe=
nt the majority of the 5 hour drive home trying to figure it out. Got home,=
car off trailer, straight to work. Pulled radiator, pulley, timing chain c=
over. No damage. Find TDC and put on my degree wheel. Pulled rockers and se=
t dial indicator on #1 intake. Tuned engine over to where cam sheet says wh=
ere #1 centerline is- 104 degrees after TDC while watching dial indicator. =
Went past 104 and dial was still climbing. Made it to to about 150ish degre=
es past TDC til indicator started to drop back down so I know I had went ri=
ght past the peak of the lobe. Pulled chain off carefully and rotated camsh=
aft until I found peak of lobe and moved crank back to 104 and set the chai=
n back on...about one tooth =C2=A0Put rockers back on and checked compressi=
on on #1. 160 PSI. That's as far as I got before my wife came down to yell =
art me. It was already 2130 at this point. More tomorrow as I put it back t=
ogether.=C2=A0
Thoughts? Ideas? Can the timing chain "float" at high revs? Thank-you in ad=
vance for any input!
V/r,
Mathieu Huovinen
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<div style=3D"color:black;font: 10pt arial;">Fellas,
<div><br>
</div>
<div>Sounds like we have the bearing cap strap issue resolved...who is up f=
or another mystery? Has anyone ever has their timing chain skip a tooth??</=
div>
<div><br>
</div>
<div>Final race on Saturday at the Turlkey Bowl this weekend at Summit Poin=
t. Triumph Spitfire..1296 engine. Double roller chain set. Car was running =
well all weekend, was out twice earlier that day. We leave false grid for t=
he to set up for the first lap and I begin to accelerate. All of a sudden t=
he car just dies and I coast off the track even before turn one. On the sid=
e of the track I couldn't start the car. In my mind I'm thinking my perrton=
ix distributor just took a shit. Got towed in and all I'm thinking in pertr=
onix. I swap in a points distributor and nothing. Perhaps my coil? Swap in =
a new coil. Nothing. Plugs perhaps? Swap in a good set of NGKs. Nothing. No=
t even a cough out of the engine. By this time I had run down the battery f=
rom trying to start it so much. At this point I was jumping the racecar bat=
tery from my Tundra truck battery thinking perhaps a weak spark from a shot=
battery. Nothing. Was getting plenty of fuel because the plugs were wet. I=
even pulled and cleaned all the jets out of the Weber 45 DCOE just to make=
sure I was getting correct fuel. Fuel. Air. Spark. COMPRESSION. This next =
day (this morning) I did a compression test at the track. 80/70/70/70. What=
the heck? Thats not a blown head gasket..the cam HAS to be out of timing. =
I spent the majority of the 5 hour drive home trying to figure it out. Got =
home, car off trailer, straight to work. Pulled radiator, pulley, timing ch=
ain cover. No damage. Find TDC and put on my degree wheel. Pulled rockers a=
nd set dial indicator on #1 intake. Tuned engine over to where cam sheet sa=
ys where #1 centerline is- 104 degrees after TDC while watching dial indica=
tor. Went past 104 and dial was still climbing. Made it to to about 150ish =
degrees past TDC til indicator started to drop back down so I know I had we=
nt right past the peak of the lobe. Pulled chain off carefully and rotated =
camshaft until I found peak of lobe and moved crank back to 104 and set the=
chain back on...about one tooth Put rockers back on and checked comp=
ression on #1. 160 PSI. That's as far as I got before my wife came down to =
yell art me. It was already 2130 at this point. More tomorrow as I put it b=
ack together. </div>
<div><br>
</div>
<div>Thoughts? Ideas? Can the timing chain "float" at high revs? Thank-you =
in advance for any input!</div>
<div><br>
</div>
<div>V/r,</div>
<div><br>
</div>
<div>Mathieu Huovinen</div>
</div>
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_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
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