Keith Black piston clearance

General engine tech -- Drag Racing to Circle Track

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cjperformance
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Re: Keith Black

Post by cjperformance » Thu Aug 10, 2017 10:40 pm

Steve.k wrote:I use cleveland intakes and spacers. The 550 hp one had holley strip dominator. This one will have torker.
Ah cool, is that the Price Motorsports spacers? I have not used them, do they fit well?
Craig.

Steve.k
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Re: Keith Black

Post by Steve.k » Thu Aug 10, 2017 11:24 pm

The last engine had spacers built by MPG Heads,I did order Price for this one yes.The mpg plates did fit good!

496blaze
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Re: Keith Black

Post by 496blaze » Thu Aug 10, 2017 11:54 pm

I had a set of these in a BBC that were made under size and the block was a little over the nominal .040 bore size. Horrible noise when cold!

I will never ever use their pistons in anything I build or own. Poor customer service and poor quality control.

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Re: Keith Black

Post by cjperformance » Fri Aug 11, 2017 12:29 am

496blaze wrote:I had a set of these in a BBC that were made under size and the block was a little over the nominal .040 bore size. Horrible noise when cold!

I will never ever use their pistons in anything I build or own. Poor customer service and poor quality control.
This is why you measure pistons first and size bores second ! Or if you are stuck with a bore size , contact the piston maker before ordering and request a measurement or a specific piston size, if they wont do that - go elsewhere.
I have had only one problem KB piston, when it arrived and I measured them up, one piston was the same as the rest at measure point but half a thou less than the rest at the bottom of the skirt. They agreed to send me another piston and upon realising I am in Australia they didnt even want to bother getting the dud one back. Imo their service was good and the pistons are fine.
Craig.

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Re: Keith Black

Post by 496blaze » Sat Aug 12, 2017 12:25 am

cjperformance wrote:
496blaze wrote:I had a set of these in a BBC that were made under size and the block was a little over the nominal .040 bore size. Horrible noise when cold!

I will never ever use their pistons in anything I build or own. Poor customer service and poor quality control.
This is why you measure pistons first and size bores second ! Or if you are stuck with a bore size , contact the piston maker before ordering and request a measurement or a specific piston size, if they wont do that - go elsewhere.
I have had only one problem KB piston, when it arrived and I measured them up, one piston was the same as the rest at measure point but half a thou less than the rest at the bottom of the skirt. They agreed to send me another piston and upon realising I am in Australia they didnt even want to bother getting the dud one back. Imo their service was good and the pistons are fine.
I paid good money to have the block machined and parts sourced. I did do the assembly and like a dummy assumed the clearances were right. After running the engine for a short time and thinking I built a diesel, i took it apart and measured everything after spending about 800 bucks on mics and a bore gauge. The pistons were about .0015 undersize at the measuring point. All of them. This along with the block being about.001 over .040 made for about .005 piston to wall clearance. Sent them back to KB and they too admitted they were all undersize, They refused to even replace the pistons since the engine had been started. I told them to throw their pistons in the trash where they belong!

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nickpohlaandp
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Re: Keith Black

Post by nickpohlaandp » Sat Aug 12, 2017 12:33 am

0.005" is good... if you have a 6" bore!
Never half ass two things... Whole ass one thing!

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MadBill
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Re: Keith Black

Post by MadBill » Sat Aug 12, 2017 5:24 pm

With no warranty recourse, that would have been a good application for Line2Line's abradable coating..
Felix, qui potuit rerum cognscere causas.

Happy is he who can discover the cause of things.

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