Engine pinging
Tourer
Joined: Sep 2014
Posts: 420
Likes: 5
From: Kingsport, TN
Here is the part # for the pistons
HARLEY-DAVIDSON® SCREAMIN’ EAGLE® PRO TWIN CAM HIGHCOMPRESSION CAST PISTON KITS* – 3-7/8" - 22661-99A
These high-compression 10.25:1 cast pistons are designed for use in a Twin Cam engine equipped with stock cylinder heads and 3-7/8" cylinders (1550). Piston kit includes rings, clips and pins. All EFI models require ECM calibration (priced separately).
Cams are se 204 part # 25149-00
HARLEY-DAVIDSON® SCREAMIN’ EAGLE® PRO TWIN CAM HIGHCOMPRESSION CAST PISTON KITS* – 3-7/8" - 22661-99A
These high-compression 10.25:1 cast pistons are designed for use in a Twin Cam engine equipped with stock cylinder heads and 3-7/8" cylinders (1550). Piston kit includes rings, clips and pins. All EFI models require ECM calibration (priced separately).
Cams are se 204 part # 25149-00
Glad you got the detonation under control. Keep a keen ear open for further detonation as the temps rise. Those cast pistons won't withstand much before Scott's and Kirby's predictions become a reality.
Last edited by dynawg1; May 13, 2015 at 04:15 PM.
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6th Gear
Joined: Apr 2013
Posts: 11
Likes: 0
From: new york
I guess what really bothers me is the guy who did the build is well respected, did 100s of these builds, is a TTS tuner instructor, and I 'm wondering why he put these cams in in the first place? I ride aggressivly and rarely am I at the speed limit. What would be the best cam so I wouldn't have to worry about this pinging , hot weather , etc.. and still get top performance?
Thanks everyone for all your replies.
Thanks everyone for all your replies.
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,024
Likes: 7,549
From: Poolville
Yea those guys are correct. It all computes to approx. 9.86:1 dynamic with a ccp of approx. 207 psi. If you ain't running at least 98-100 octane you will have problems. IMHO woods tw-555. puts your dynamic right at 9.6 and breathes real well...
Tourer
Joined: Sep 2014
Posts: 420
Likes: 5
From: Kingsport, TN
I guess what really bothers me is the guy who did the build is well respected, did 100s of these builds, is a TTS tuner instructor, and I 'm wondering why he put these cams in in the first place? I ride aggressivly and rarely am I at the speed limit. What would be the best cam so I wouldn't have to worry about this pinging , hot weather , etc.. and still get top performance?
Thanks everyone for all your replies.
Thanks everyone for all your replies.
Last edited by dynawg1; May 13, 2015 at 06:47 PM.
HDF Community Team
Joined: Jun 2006
Posts: 12,763
Likes: 2,597
From: san antonio
I guess what really bothers me is the guy who did the build is well respected, did 100s of these builds, is a TTS tuner instructor, and I 'm wondering why he put these cams in in the first place? I ride aggressivly and rarely am I at the speed limit. What would be the best cam so I wouldn't have to worry about this pinging , hot weather , etc.. and still get top performance? Thanks everyone for all your replies.
How about measuring actual CCP before coming to any rash decisions about changing cams? The model year, particularly the heads, would also help in selecting a replacement cam if that is the route you choose to follow. Early heads are limited to .510" lift; '05 and later heads will carry up to .600" lift because of the beehive springs.
The head cooling fan is a great idea as well in a high compression motor that generates more heat. How does the bike run now compared to before the dyno tweak? Same power or down a bit on power?
Go at this one step at a time based on actual data; not the calculated data being cited in the thread so far.
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6th Gear
Joined: Apr 2013
Posts: 11
Likes: 0
From: new york
Sorry man, this is all new to me. The bike is 2005 Softail springer. No head work was done at the time of the re build ( stock). The pistons are in fact 10.25. The head gasket used was SEpart # 16101-01 multi layered ?
Its pretty cool out today around 70 and the bike ran fine, no pinging. Since the re build the torque and power gains have been pretty dramatic from what it was. Has not been on the dyno yet and only has 350 miles on the re build.
Its pretty cool out today around 70 and the bike ran fine, no pinging. Since the re build the torque and power gains have been pretty dramatic from what it was. Has not been on the dyno yet and only has 350 miles on the re build.
Tourer
Joined: Sep 2014
Posts: 420
Likes: 5
From: Kingsport, TN
Sorry man, this is all new to me. The bike is 2005 Softail springer. No head work was done at the time of the re build ( stock). The pistons are in fact 10.25. The head gasket used was SEpart # 16101-01 multi layered ?
Its pretty cool out today around 70 and the bike ran fine, no pinging. Since the re build the torque and power gains have been pretty dramatic from what it was. Has not been on the dyno yet and only has 350 miles on the re build.
Its pretty cool out today around 70 and the bike ran fine, no pinging. Since the re build the torque and power gains have been pretty dramatic from what it was. Has not been on the dyno yet and only has 350 miles on the re build.
Sponsor
Joined: Dec 2007
Posts: 12,084
Likes: 829
Start by getting a quality compression tester with the correct adapter fitting for the HD spark plug size and thread and measure the actual CCP (cold cranking compression) with a fully charged battery and the automatic compression releases disabled (if so equipped). Once we know the actual CCP and the cams currently installed, we can be of much greater assistance in assessing any issues should you wish for that type of help.
Good advice.
Scott
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Tourer
Joined: Jul 2007
Posts: 497
Likes: 8
From: New Egypt, NJ
Everyone who replied here has you pretty well covered. I just wanted to second what djl said vis a vis chamber volume. Scott milled my heads to get the chamber volume DOWN to 88cc. Stock is supposed to be 85. So what I'm getting at is, if your chambers are oversized like mine, your compression isn't as high as you think. Which would be good for your situation: it's possible - even likely - that you ended up with tolerable compression for that cam.
As suggested above, do a compression test and that will give you (and the forum members advising you) a better idea what you have.
As suggested above, do a compression test and that will give you (and the forum members advising you) a better idea what you have.
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