Max clearance with hyper pistons 5-.00
#2806036
08/07/20 07:59 AM
08/07/20 07:59 AM
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Joined: Jan 2007
Posts: 685 pennsylvania
poboyengineering
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mopar
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OP
mopar
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Posts: 685
pennsylvania
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I have a set of KB107 pistons and their website says. 001-0045 p/w clearance. My block will give me. 008. How loose can they be run?
It may be ugly, but it sure is slow.
Girls comb their hair in rear view mirrors and the boys try to look so hard....
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Re: Max clearance with hyper pistons 5-.00
[Re: poboyengineering]
#2806090
08/07/20 10:43 AM
08/07/20 10:43 AM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
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I have a set of KB107 pistons and their website says. 001-0045 p/w clearance. My block will give me. 008. How loose can they be run? Line2line coating is what you want.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Max clearance with hyper pistons 5-.00
[Re: madscientist]
#2806107
08/07/20 11:32 AM
08/07/20 11:32 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Master
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Romeo MI
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I have a set of KB107 pistons and their website says. 001-0045 p/w clearance. My block will give me. 008. How loose can they be run? Line2line coating is what you want. With that much clearance you are asking a lot for a coating.. I had 1 set of pistons coated and they wouldnt guarantee any with that much.. most they would go was .004.. I ran that engine on the loose side.. it had piston slap when cold but as it heated up it would get better
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Re: Max clearance with hyper pistons 5-.00
[Re: poboyengineering]
#2806176
08/07/20 02:35 PM
08/07/20 02:35 PM
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Joined: Mar 2011
Posts: 3,079 Michigan
A727Tflite
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Michigan
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I have a set of KB107 pistons and their website says. 001-0045 p/w clearance. My block will give me. 008. How loose can they be run? Follow the piston manufacturers suggested clearance specs. As for Lins2Line, call them, I think they will tell you they can help you. I had .004” added to my pistons and no problems.
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Re: Max clearance with hyper pistons 5-.00
[Re: 80fbody]
#2806185
08/07/20 02:56 PM
08/07/20 02:56 PM
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Joined: Jan 2007
Posts: 685 pennsylvania
poboyengineering
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Have a short block with similar situation. Thought about having the pistons coated since they are new and came with the shortblock. Likely to crack/collapse the skirts on those style pistons with too much piston slap. This is what I'm afraid of since they are pretty brittle.This block was from a dirt track racer, and it has 8 sleeves and they measure 4.005, pistons at 3.993. The pistons are new, and the block just needs a quick hone.
It may be ugly, but it sure is slow.
Girls comb their hair in rear view mirrors and the boys try to look so hard....
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Re: Max clearance with hyper pistons 5-.00
[Re: poboyengineering]
#2806193
08/07/20 03:22 PM
08/07/20 03:22 PM
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Joined: Aug 2019
Posts: 9,478 Super Spudsville
Mr PotatoHead
Half Baked
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Half Baked
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Super Spudsville
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That be a no go.
I run some hard at .003 on cold assembly and they rattle like old trw-s.
Id think at your specs if you run it hard your gonna be crackin skirts.
The low end forged are not much more then a new set of hypers these days. $100 diff.
The lower end icon forged is what im talking about.
Last edited by Mr. Potatohead; 08/07/20 03:24 PM.
STOP POTATO HATE!
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Re: Max clearance with hyper pistons 5-.00
[Re: poboyengineering]
#2806608
08/08/20 03:50 PM
08/08/20 03:50 PM
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Joined: Aug 2003
Posts: 43,202 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,202
Bend,OR USA
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I have a set of KB107 pistons and their website says. 001-0045 p/w clearance. My block will give me. 008. How loose can they be run? Are you feeling lucky? Are you willing to loose a block over not knowing how much is to much clearances on those type pistons
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Max clearance with hyper pistons 5-.00
[Re: Cab_Burge]
#2806693
08/08/20 08:52 PM
08/08/20 08:52 PM
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Joined: Jan 2007
Posts: 685 pennsylvania
poboyengineering
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No, I'm not willing to sacrifice this block on an experiment, hence my question. I appreciate the advice, but it seems to bring up a couple of more. Since the block is 4.005, will I be able to get pistons that aren't under 4.000? Or, since this has 8 sleeves, can they be bored? I don't mind going 4.030 if needed.
It may be ugly, but it sure is slow.
Girls comb their hair in rear view mirrors and the boys try to look so hard....
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Re: Max clearance with hyper pistons 5-.00
[Re: lewtot184]
#2806769
08/09/20 09:34 AM
08/09/20 09:34 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Master
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Romeo MI
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you can buy another set of kb107's in .020" or .030" for less than $300 dollars. that's cheap! so why waste time and money with custom pistons if the KB's will work? No way would I go with a set of custom pistons.. why go that way when you bought a set of inexpensive ones to begin with.. you might end up going .020 over KBs but then you would need a bore job if the block allows it
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Re: Max clearance with hyper pistons 5-.00
[Re: poboyengineering]
#2806870
08/09/20 01:58 PM
08/09/20 01:58 PM
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Joined: Jul 2008
Posts: 609 Boise
Moparteacher
mopar
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mopar
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Posts: 609
Boise
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No, I'm not willing to sacrifice this block on an experiment, hence my question. I appreciate the advice, but it seems to bring up a couple of more. Since the block is 4.005, will I be able to get pistons that aren't under 4.000? Or, since this has 8 sleeves, can they be bored? I don't mind going 4.030 if needed. Your block is at 4.005 now. With a .02" over piston the bore would need to be enlarged by approximately .015". That's .0075 of material removed from the wall. That's equivalent to two sheets of writing paper. All this assuming you stay with the clearance machined into the new pistons and don't require any additional clearance at 4.02". I highly doubt that .0075" removed from the liners would be too much, but you can always have it checked prior to machining.
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Re: Max clearance with hyper pistons 5-.00
[Re: poboyengineering]
#2807066
08/09/20 09:30 PM
08/09/20 09:30 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
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master
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Washington
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Have a short block with similar situation. Thought about having the pistons coated since they are new and came with the shortblock. Likely to crack/collapse the skirts on those style pistons with too much piston slap. This is what I'm afraid of since they are pretty brittle.This block was from a dirt track racer, and it has 8 sleeves and they measure 4.005, pistons at 3.993. The pistons are new, and the block just needs a quick hone. Just CALL Line2Line and TALk to them. The coating they make and use is NOT like other coatings. They can easily make up that clearance and the pistons will fit better than if you bought new pistons and sized them. It’s not like a regular coating. Don’t make this harder than it is.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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