Pinga ling a ding
Thread Starter
|
6th Gear
Joined: Oct 2019
Posts: 12
Likes: 0
From: Redding
Pinga ling a ding
I have an 88 2000 ultra classic that was bored to a 95 but then a 103 crank and pistons installed. Stock heads and S&S 510 cams. I have pinging like no tomorrow, especially when hot. I've had it dyno'd and they can't seem to work it out. I'm guessing the modifications are just to "unmatched". One thing a local shop said is that I have higher compression with the 103 stroker set up and the 91 octane gas just isn't enough. I've tried adding octane booster which gets me to about 96 octane but still pings. I've mapped and remapped. The same shop said I should put on 60K head gaskets to reduce the compression and that should help. This may make sense when I see that the 510 cams are for up to a 96" kit and 9.7:1 compression. Could it be a simple as decreasing the compression ratio? Thoughts? Thanks in advance for your help.
Stellar HDF Member
Joined: Feb 2013
Posts: 3,072
Likes: 1,727
From: Dallas, Texas
TC-88 with a longer stroke TC-103 crank and a 95 inch kit should give you a 103 inch engine. S&S 510 cams in your engine will give you around a 9.43:1 compression ratio. Cold cranking pressure of 196 psi at sea level. That's good. Ya don't really want to lower the 9.43:1 compression ratio. Since it pings more when hot, maybe ad an oil cooler to help keep the heat down. Only other options are fatten up the fuel curve or retard the spark advance. Contact the maker of your fuel programmer and ask for their advise.
Thread Starter
|
6th Gear
Joined: Oct 2019
Posts: 12
Likes: 0
From: Redding
Ping a ling a ding
TC-88 with a longer stroke TC-103 crank and a 95 inch kit should give you a 103 inch engine. S&S 510 cams in your engine will give you around a 9.43:1 compression ratio. Cold cranking pressure of 196 psi at sea level. That's good. Ya don't really want to lower the 9.43:1 compression ratio. Since it pings more when hot, maybe ad an oil cooler to help keep the heat down. Only other options are fatten up the fuel curve or retard the spark advance. Contact the maker of your fuel programmer and ask for their advise.
Seasoned HDF Member
Joined: Oct 2015
Posts: 13,538
Likes: 34,736
From: Pine Flat Dam/South Bay Area, CA
You are just masking the problem. I'm running 9.8-1 compression on my daily rider (190 ccp) and it never pings running 87 octane regular gas. Not even riding 2 up in 110 degree temperatures.You have to run the right heads and cam to be able to do that, though.
Trending Topics
Thread Starter
|
6th Gear
Joined: Oct 2019
Posts: 12
Likes: 0
From: Redding
Ping a ling a ding
I should mention I'm running two plugs cooler as well. Is there an issue with running the stock heads? Is that that mis match here? Thanks all
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Banned
Joined: Jul 2009
Posts: 7,406
Likes: 834
From: Straight Jacket Memories and Sedative Highs
Why don't you enlighten us with your set up? I am running 37g, flatops, .03 gasket, port heads. Not sure what I'll do next time. Eventually will do my other bike.
Seasoned HDF Member
Joined: Oct 2015
Posts: 13,538
Likes: 34,736
From: Pine Flat Dam/South Bay Area, CA
Screamin' Eagle heads (bathtub chamber), 0 deck height on cylinders, .030 head gaskets,and a Wood W6 cam.Runs the best on 87 octane fuel. Dyna 2000 ignition module set on the number 2 curve. 40mm CV carb with N65 needle with 185 main jet and a 45 pilot jet.
Last edited by Tommy C; Oct 5, 2019 at 03:39 AM.