Any potential pinging problems?
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Ultimate HDF Member
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Any potential pinging problems?
2012 FL with ACR's
103 cast pistons
TMan 555 TQ cams
Big Boyz heads cc'd at 85
deck height 0
HG .030
Static 10.14:1
Corrected 9.46:1
Cold Cranking 193.7
I'm in Oklahoma. It gets hotter than blue blazes round here.
103 cast pistons
TMan 555 TQ cams
Big Boyz heads cc'd at 85
deck height 0
HG .030
Static 10.14:1
Corrected 9.46:1
Cold Cranking 193.7
I'm in Oklahoma. It gets hotter than blue blazes round here.
HDF Community Team
Joined: Jun 2006
Posts: 12,773
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From: san antonio
I would say yes; particularly in a hot climate which, living in south Texas, I know something about. You did not include compression releases in your build discription and those are an absolute if you stick with that build plan.
JMHO, but backing corrected off to less than 9.3 and/or CCR down to about 185 will dodge the pinging bullet and not detract from the performance. I would still inlcude compression releases just to make things easier on the battery and starter. As usual, JMHO.
JMHO, but backing corrected off to less than 9.3 and/or CCR down to about 185 will dodge the pinging bullet and not detract from the performance. I would still inlcude compression releases just to make things easier on the battery and starter. As usual, JMHO.
Tourer
Joined: Oct 2010
Posts: 436
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From: Pittsburgh PA
You have a typo, you are actually at 197.3 CCP.
I'm setting my bike up at 196.5 CCP @ sea level. I'm at 900ft so 191 around local.
I have been told on another forum that I should not expect any pinging issues with 92/93 octane gas but if I am at sea level and can't get the good stuff it's a possibility. But opinions vary and djl always has good advice.
IMO, the .040 HG would make things worse not better. It will lower your CR, but does so at the expense of increasing the height of your squish band. Look up quench and squish to get a better understanding.
I'm setting my bike up at 196.5 CCP @ sea level. I'm at 900ft so 191 around local.
I have been told on another forum that I should not expect any pinging issues with 92/93 octane gas but if I am at sea level and can't get the good stuff it's a possibility. But opinions vary and djl always has good advice.
IMO, the .040 HG would make things worse not better. It will lower your CR, but does so at the expense of increasing the height of your squish band. Look up quench and squish to get a better understanding.
Sponsor
Joined: Dec 2007
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194 in a heavier bike, in the heat of your local, may be an issue.
A spot-on tune would be a good idea.
Scott
Thread Starter
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Ultimate HDF Member
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You have a typo, you are actually at 197.3 CCP.
I'm setting my bike up at 196.5 CCP @ sea level. I'm at 900ft so 191 around local.
I have been told on another forum that I should not expect any pinging issues with 92/93 octane gas but if I am at sea level and can't get the good stuff it's a possibility. But opinions vary and djl always has good advice.
IMO, the .040 HG would make things worse not better. It will lower your CR, but does so at the expense of increasing the height of your squish band. Look up quench and squish to get a better understanding.
I'm setting my bike up at 196.5 CCP @ sea level. I'm at 900ft so 191 around local.
I have been told on another forum that I should not expect any pinging issues with 92/93 octane gas but if I am at sea level and can't get the good stuff it's a possibility. But opinions vary and djl always has good advice.
IMO, the .040 HG would make things worse not better. It will lower your CR, but does so at the expense of increasing the height of your squish band. Look up quench and squish to get a better understanding.
Thread Starter
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Ultimate HDF Member
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Cometic makes a .036 HG. Would that be any better, Scott? TR, says "200 CCP is very streetable" but he didnt ask where I live and the heat here gets down right unbearable in the summer. He did say and Im paraphrasing here to pay attention to spark tables when tuning. I just bought my own dyno but Im a long ways from being a tuner right now. Looking to get educated in that area in the very near future. Thanks for posting here by the way.
Last edited by 1931jamesw; Jan 14, 2012 at 02:22 PM.
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HDF Community Team
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From: san antonio
IMHO, a thicker head gasket will make things worse, as dcgray has pointed out. You don't reduce compression much but you open up squish which is the wrong way to go. As I said previously, get corrected CR down to less than 9.3 and CCR down to 190psi or less. You can do that by opening up the chambers to 88ccs, easy to do. Or, swap the 555 Torqster cams for TMans 590 or an Andrews 54; both good choices. JMHO.
TRs comment about paying attention to spark tables is code for a spot on tune. Even so, a hot day and some chitty gas can be a problem. If you go with your original plan, better plan on keeping a can or two of octane boost with you on longer rides. Personally, what you give up by lowering compression will never be missed and just not worth the angst. I replaced a set of 204s in a strong running 95" for the same reason a few years back. We took timing out and got rid of the detonation but the engine was a turd without the retarded timing. Hated to pull the 204s, bike was strong but replaced them with a set of Andrews 44s, nearly identical numbers but the curve did move to the right a bit with the 44s and I only notice it when riding two up. But, much happier not having to deal with the detonation.
TRs comment about paying attention to spark tables is code for a spot on tune. Even so, a hot day and some chitty gas can be a problem. If you go with your original plan, better plan on keeping a can or two of octane boost with you on longer rides. Personally, what you give up by lowering compression will never be missed and just not worth the angst. I replaced a set of 204s in a strong running 95" for the same reason a few years back. We took timing out and got rid of the detonation but the engine was a turd without the retarded timing. Hated to pull the 204s, bike was strong but replaced them with a set of Andrews 44s, nearly identical numbers but the curve did move to the right a bit with the 44s and I only notice it when riding two up. But, much happier not having to deal with the detonation.
Last edited by djl; Jan 14, 2012 at 03:28 PM.
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Road Captain
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Gentleman; I don't mean to hi-jack this thread. I am also considering a 103 build for my 08 Street Glide. I would definitely want to stay under 10:1 comp. Could someone please explain the difference between " static and corrected compression". Thanks in advance. Again, I don't mean to hi-jack the thread....
