Re: 360 Piston Choice
[Re: Rob C]
#2063346
04/28/16 01:28 PM
04/28/16 01:28 PM
|
Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
|
I dont see a problem with either choice as far as integrity goes but I would get quench if you have closed chamber heads or mill the recesses in the open chambered heads then work with plateau pistons to achieve it if you want to go that far (its time/money but worth it). #1 quench (if you can) #2 cam choice (one that you can live with) (3) octane choice) (4) SCR to get the DCR in a good range so you can run a fast ign curve & be under the pinging line. As said detonation will kill any of em (not to mention any names but some quicker than others!).
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: 360 Piston Choice
[Re: elmor353]
#2063393
04/28/16 02:25 PM
04/28/16 02:25 PM
|
Joined: Jan 2003
Posts: 1,255 Columbus, GA
Michael Ecks
pro stock
|
pro stock
Joined: Jan 2003
Posts: 1,255
Columbus, GA
|
Had KB 107 in my 360 for over two decades of street abuse now. Couple hundred thousand miles, bad pinging problems for a lot of those miles, three tear downs, three different sets of rings. Zero issues. I would use them again in a heartbeat.
Think hard about your CR, timing, and fuel choices. The 107s with unmilled j heads and a Mopar Performance distributor, I could get the thing to NOT ping even on premium. Changed to a stock distributor last spring and now it runs as just as good on 87 octane.
"The happiness of your life depends upon the quality of your thoughts" ~ Roman Emperor Marcus Aurelius
|
|
|
Re: 360 Piston Choice
[Re: dogdays]
#2063537
04/28/16 07:13 PM
04/28/16 07:13 PM
|
Joined: Jan 2003
Posts: 1,255 Columbus, GA
Michael Ecks
pro stock
|
pro stock
Joined: Jan 2003
Posts: 1,255
Columbus, GA
|
First of all, let's get something straight. Any Sealed Power or Speed Pro piston with an "h" in front of it is a hypereutectic piston. So the H116CP as well as the H405CP are both hypereutectic pistons.
Second, what heads are you going to be running? That's a huge question. Open chamber heads and closed chamber heads have different needs.
One major advantage the KBs have is they are light. The 107 is 507 grams and pin is 132. Sealed Power/Speed Pro pistons are usually stock weight which in this case would be 584 grans, plus the thicker wall pin is at least 152 grams. That's at least 87 grams off the piston/pin assembly.
I'd suggest going to the United Engine and Machine website and look at the choices and their weights.
Keith Black pistons do require larger ring gaps, especially the top ring. This gap is usually big enough that one can use regular rings and file fit them.
Do look around on ebay and other places. For example I found a set of forged pistons for 4" stroke 360 for $315.00
Good Luck!
R. Didn't realize the Speed Pros were close to stock weight. KBs are definitely lighter and will necessitate a balance job on the rotating assembly. Something else for the OP to keep in mind. The KBs definitely need the larger gap on the top ring. I've read elsewhere this is a lot of the source of negative feedback in KBs, user error. People put them in with stock end gap, ring s heat up and ends contact, ring keeps expanding until it wedges into the cylinder wall, top of piston cracks off. I've always used off the shelf rings and hand filed the gap on the top ring myself. Just takes a little measuring and some careful work with a fine file. Formula for necessary gap is on their website.
"The happiness of your life depends upon the quality of your thoughts" ~ Roman Emperor Marcus Aurelius
|
|
|
Re: 360 Piston Choice
[Re: Michael Ecks]
#2063668
04/28/16 11:23 PM
04/28/16 11:23 PM
|
Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
|
I'd suggest going to the United Engine and Machine website and look at the choices and their weights.
The KBs definitely need the larger gap on the top ring. (1) very user friendly calculator for SCR (they have DCR but I would not recommend it) (2) 0.0065" gap per inch of bore on top ring (street/normally aspirated). 2nd ring same as normal (I go with 0.003" per inch of bore) but KB wants .004 per inch on the 2nd ring on their pistons
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: 360 Piston Choice
[Re: RapidRobert]
#2064011
04/29/16 02:16 PM
04/29/16 02:16 PM
|
Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 16,376
|
I suggest you go to the Silvolite website and look over the KB piston selection there. IIRC there are 5 different Keith Black pistons. As you have an open chamber I think it would help to have one with a "quench dome". If at some later time you decide to go closed chamber the quench dome can be machined off.
Actually as you have an open chamber I would suggest Magnum heads and a reverse dome piston set close to the top of the bore..
R.
Last edited by dogdays; 04/29/16 02:17 PM.
|
|
|
Re: 360 Piston Choice
[Re: elmor353]
#2064037
04/29/16 03:03 PM
04/29/16 03:03 PM
|
Joined: Jan 2005
Posts: 12,422 Kalispell Mt.
HotRodDave
I Live Here
|
I Live Here
Joined: Jan 2005
Posts: 12,422
Kalispell Mt.
|
Most of the KB hyper failures can be traced back to improper ring gap (ignoring the instructions and doing what you have always done) or severe detonation. I have had real good luck with the KB107 and really like how you can get tight quench easily with it.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
|
|
|
Re: 360 Piston Choice
[Re: elmor353]
#2064871
04/30/16 06:48 PM
04/30/16 06:48 PM
|
Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
|
I'd Google it & see what the gram spec for em is. My balancer has a limit of 20 grams (iirc) & thats on the recip part of the formula so it is cut in half when added in so its actually pretty limited on the leeway. Do ya feel lucky? well do ya
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: 360 Piston Choice
[Re: elmor353]
#2064957
04/30/16 09:52 PM
04/30/16 09:52 PM
|
Joined: Jan 2003
Posts: 20,204 Park Forest, IL
slantzilla
Too Many Posts
|
Too Many Posts
Joined: Jan 2003
Posts: 20,204
Park Forest, IL
|
I had many people tell me KB pistons were junk and I could never spray with them. That is a wad of crap. They were fine. I did break one in half when I got greedy, but that wasn't KB's fault.
Yee, do open up tye top ring gap or the top ring will butt and blow the land up. On a 3.45 bore I had mine as wide as .035.
"Everybody funny, now you funny too."
|
|
|
Re: 360 Piston Choice
[Re: elmor353]
#2064968
04/30/16 10:04 PM
04/30/16 10:04 PM
|
Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
|
Did a little digging and found that factory piston weight is 584 grams and Speed Pro H116CP is 567. Is that enough of a difference to worry about re-balancing? I would talk to your man but it sounds good from here
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: 360 Piston Choice
[Re: elmor353]
#2065958
05/02/16 03:14 PM
05/02/16 03:14 PM
|
Joined: Nov 2011
Posts: 2,154 Its a TRAP!
DARTH V8Я
Oh No!! I just had a moron attack!
|
Oh No!! I just had a moron attack!
Joined: Nov 2011
Posts: 2,154
Its a TRAP!
|
Close chamber heads with (your favorite brand) D-dish pistons is the only way to fly. If you want a pinging iron headed motor then by all means go with 9.5:1 flat tops.
When it takes more than a sweet mullet to prove you rule at the trailer park..
|
|
|
Re: 360 Piston Choice
[Re: DARTH V8Я]
#2067790
05/05/16 03:27 PM
05/05/16 03:27 PM
|
Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 16,376
|
|
|
|
|
|