Piston to Valve Clearance
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Road Captain
Joined: Aug 2018
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From: Stockholm
Piston to Valve Clearance
Hello, Dyna 2006 here, bored to 98 ci. Present cam is Andrews 26 and I am planning for 57.
In doing this I am concerned about the valve to piston clearance.
Milled heads: -0.010 (-0.24 mm)
MLS: 0.040
Pistons: JE Piston 1:9.5, with dome 1.2 cc
Deck height: front 0.005, rear 0.002
Andrews 57 lift: 0.560. Compared to the 26 (lift: 0.490) it lifts 0.070 (1.78 mm) higher.
If I knew the original stock clearance I would feel more safe.
Anyone here know? Or what do you think?
Thanks a lot
In doing this I am concerned about the valve to piston clearance.
Milled heads: -0.010 (-0.24 mm)
MLS: 0.040
Pistons: JE Piston 1:9.5, with dome 1.2 cc
Deck height: front 0.005, rear 0.002
Andrews 57 lift: 0.560. Compared to the 26 (lift: 0.490) it lifts 0.070 (1.78 mm) higher.
If I knew the original stock clearance I would feel more safe.
Anyone here know? Or what do you think?
Thanks a lot
Thread Starter
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Road Captain
Joined: Aug 2018
Posts: 589
Likes: 93
From: Stockholm
Yes, I understand. You are right off course. Just thought I would get an idea, as I do not want to lift the heads.
Last edited by OakMountainRider; Dec 17, 2024 at 07:12 AM.
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hummmm
only other option is fly it and watch it
do not forget valve springs, just as catastrophic
you can always fly cut the pistons but check the mfg before doing so.
been there done that modifying two cycle pistons for 5 port.
only other option is fly it and watch it
do not forget valve springs, just as catastrophic
you can always fly cut the pistons but check the mfg before doing so.
been there done that modifying two cycle pistons for 5 port.
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Road Captain
Joined: Aug 2018
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From: Stockholm
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Whatever you do.. Clay it. Dont trust math or anothers results.. Clay it. Get some super light springs to install and rotate the assembly.
I like a minimum of 40 thou myself. At higher rpms and heat growth you want some cushion.
I like a minimum of 40 thou myself. At higher rpms and heat growth you want some cushion.
Last edited by Rains2much; Dec 17, 2024 at 09:58 AM.