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Old 05-12-2019, 03:37 PM   #1 (permalink)
IronButt
 
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shovel cylinders 100 miles after rebuilding

Hi guys,

Friend of mine rebuilt shovelhead motor. 100 miles after assembling rear cylinder started smokin. He pulled up head and cylinder. Marks found on the cylinder. Piston is like new. No sign of wear. He decided to pull front head also. The same story. Pistons are S&S forged. Cylinders were bored and honed by reputable shop. I was checking the clearance personally. It was perfect done.
What could be a problem?



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Road King 2003
98" CP pistons, domed +3ccm
CR 10.1:1
cylinders bored and honed by myself
heads-ported and milled by myself - 84ccm chambers
S&S 570 cams
S&S SUPER E carb
Dynatec 2000 ign.
HIvol oil pump

Heritage Softail 2003
95 flat top pistons
static compression ratio 9.82:1
Andrews tw37b cams
S&S super E carb
Crane ignition Fireball H4
87 Hp, 107 FTLB of torque

1943 WLA bobber


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Old 05-12-2019, 04:48 PM   #2 (permalink)
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Get your long feeler gauges out and check the piston to jug clearance. Then bolt the jug to the case and check it again.

I think you'll find that its tight in the case.
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Old 05-12-2019, 05:25 PM   #3 (permalink)
IronButt
 
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tall terry is still riding a stock bike tall terry is still riding a stock bike
it looks tight to me as well,,, forged run at .003-.005..
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Old 05-13-2019, 01:49 AM   #4 (permalink)
IronButt
 
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Quote:
Originally Posted by tall terry View Post
it looks tight to me as well,,, forged run at .003-.005..
0.0035" is the actual clearance in jugs off tge block cindition.
Will check what Thermo suggested.
Thanks guys
__________________
Road King 2003
98" CP pistons, domed +3ccm
CR 10.1:1
cylinders bored and honed by myself
heads-ported and milled by myself - 84ccm chambers
S&S 570 cams
S&S SUPER E carb
Dynatec 2000 ign.
HIvol oil pump

Heritage Softail 2003
95 flat top pistons
static compression ratio 9.82:1
Andrews tw37b cams
S&S super E carb
Crane ignition Fireball H4
87 Hp, 107 FTLB of torque

1943 WLA bobber


____________________________________________
RIDE NOW, WORK LATER!
Lukas is offline   Reply With Quote Quick reply to this message
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