pinging,timing,& squish
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pinging,timing,& squish
My 03 ultra tends to ping, I don't want to back the timing off much more &\\; lose power. I think the squish could be more than the recommended .035. Is there a more accurate way to  \\;check the squish than with solder? I have heard it is not the most accurate method,&\\; I don't want to tear it apart to check. The engine builder said it was .037, but it only has 170 cranking comp. that seems low to me. For what I have read it should be 190 or more. Any input would be helpful.
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Road Master
Joined: Sep 2006
Posts: 999
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From: Allentown,Pa.
RE: pinging,timing,& squish
For a street machine you don't want to be over 185 COLD CRANKING from what I have read,what is your CR \\;and head CC's at? \\; \\;Have you had it tuned? \\; I can't believe your \\;CR is right. \\;
Road Master
Joined: Mar 2006
Posts: 760
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From: Plano, Texas
RE: pinging,timing,& squish
The nightrider website appears to be down tonight, but they have some great info about performance builds on their site. They also have some calculators there for figuring out the ccp of builds and other things.
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I think your ccp is low, I think it should be over 200 on a 10.5, 95"  \\;\\\\\\;build.
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As far as removing timing is concerned, if your motor is pinging, it isn't tuned right. I have been told by performance builders to "give the motor what it wants", and if it is pinging, it wants less timing and/or more fuel where it is pinging.
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I think your ccp is low, I think it should be over 200 on a 10.5, 95"  \\;\\\\\\;build.
 \\;\\\\\\;
As far as removing timing is concerned, if your motor is pinging, it isn't tuned right. I have been told by performance builders to "give the motor what it wants", and if it is pinging, it wants less timing and/or more fuel where it is pinging.
RE: pinging,timing,& squish
Cam characteristics have as much to do with ccp as anything. Mild low to midrange cams are going to be more efficient at charging the cylinders when cranking than cams with longer duration and more overlap.
Road Master
Joined: Jan 2006
Posts: 1,221
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From: Chester NY
RE: pinging,timing,& squish
The big boyz site had a great comrpession calculator if you have all your motor specs. If not, you will alway be guessing....We need, bore, stroke, rod length, head gasket thikness,head gasket bore, cyl head volume, intake closing on cam, etc....
As for 170 ccp, not sure of the specs for your cam, but the ccp has to match the build...
For your pinging, look at fuel and timing first by a GOOD dyno tuner. If the build was done correctly, is should be no problem fixing it. By the way your squish if .037 is not bad at all, i usually shoot for .030-.040 max
As for 170 ccp, not sure of the specs for your cam, but the ccp has to match the build...
For your pinging, look at fuel and timing first by a GOOD dyno tuner. If the build was done correctly, is should be no problem fixing it. By the way your squish if .037 is not bad at all, i usually shoot for .030-.040 max
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RE: pinging,timing,& squish
You, are all correct it is not properly tuned yet. I had it on a dyno earlier this year the #s were low, we found \\;that there was a bad o-ring on the oil pump so it was sumping, Ihave not been back to a dyno \\;yet,but my timing curve &\\; afr is from Mike Roland &\\; I did not want to stray from it too far. This time I will go to Mike Roland since he is only120 miles away. \\;I also question the throttle body, bc dual runner \\;&\\; my Bassani duals.I have been thinking 2-1 exhaust. It would be nice to have, the squish, tb &\\; exhaust correct before it goes back on a dyno. \\;As soon as I find time I will work on the compression calculator. For today, it is sunny &\\; 85 here in MN I have to go ride. thank you all for the help \\;
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