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pistons
https://www.slantsix.org/forum/viewtopic.php?t=17509		 Page 1 of 1
Author:  joe4soccer [ Wed May 10, 2006 8:38 pm ]
Post subject:  pistons
hello there folks. i'm attempting to stroke my slant six with the long rods and the 2.2 pistons. there is one problem i'm having a hard time finding 6 of them. they are the keith black pistons. part number kb239. does anybody know where i can purchase these online?
Author:  emsvitil [ Wed May 10, 2006 8:49 pm ]
Post subject: 
www.summitracing.com


search for

uem-kb239 and you'll get some options
Author:  joe4soccer [ Wed May 10, 2006 8:51 pm ]
Post subject: 
thanks alot
Author:  Mel Ott [ Thu May 11, 2006 9:28 am ]
Post subject:  Re: pistons
Quote:
hello there folks. i'm attempting to stroke my slant six with the long rods and the 2.2 pistons. there is one problem i'm having a hard time finding 6 of them. they are the keith black pistons. part number kb239. does anybody know where i can purchase these online?
Hmmm.... what am I missing here ??

What crank are you using, where did you get it ??

Would like more details .. ( I might be interested in this mod )
Author:  Bohmer2 [ Thu May 11, 2006 10:46 am ]
Post subject: 
Mel,
Check out this link from the articles section. http://www.slantsix.org/articles/stroking/stroking.htm

Basically using the longer rods from a 198 slant six in a 225 block/crank with 2.2L (four cylinder) pistons.

Brian
Author:  Tom Drake [ Thu May 11, 2006 10:56 am ]
Post subject: 
http://www.forwardmotioninc.com/

Try these guys as well.
Author:  Mel Ott [ Thu May 11, 2006 11:35 am ]
Post subject: 
Quote:
Mel,
Check out this link from the articles section. http://www.slantsix.org/articles/stroking/stroking.htm

Basically using the longer rods from a 198 slant six in a 225 block/crank with 2.2L (four cylinder) pistons.

Brian
OK..unless I've missed something here, you're not actually Stroking
this engine but taking advantage of these parts to get a better
compression ratio ??

I don't want to "Rain on your Parade", but I'm not sure its worth the
effort when you could order a set of Hi-Compression pistons from one
of the after-market manufactures.
I don't see the advantages to this mod.
Author:  gmader [ Thu May 11, 2006 12:00 pm ]
Post subject: 
http://www.hotrod.com/techarticles/pit/index14.html

Yeah, HR magazine sucks, but this may have some good background on the issue.
Author:  70valiant [ Thu May 11, 2006 12:31 pm ]
Post subject: 
the benifit is with the long rods you can use lighter pistons
Author:  Mel Ott [ Thu May 11, 2006 12:48 pm ]
Post subject: 
Quote:
http://www.hotrod.com/techarticles/pit/index14.html

Yeah, HR magazine sucks, but this may have some good background on the issue.

Ummm........ OK...........

I'm not looking to get into any major/minor dis-agrrement on this ....
I'd just like to understand the thinking behind it.
Unless this is an All-Out race car it seems to me to be alot of bother
for a Street-Cruiser.
Just because something 'Can' be done doesn't necessarily mean it
should be done.
Its been more than 30 years since I built an engine, I guess the way
some things are thought about / percived could have changed.

Generally I look at things in as "Cost vs. Gain" .
Author:  SlantSixDan [ Thu May 11, 2006 1:45 pm ]
Post subject: 
Quote:
OK..unless I've missed something here, you're not actually Stroking this engine but taking advantage of these parts to get a better
compression ratio ??
No, this is nothing to do with compression ratio, and the lighter piston weight mentioned by 70Valiant is only a side benefit. The real benefit to the longer rods is a more favourable "rod ratio" (properly: rod:stroke ratio) which means less sideloading of the piston against the bore (=reduced friction and bearing stress), and longer piston dwell time at TDC (=better resistance to detonation) and at BDC (=better cylinder scavenging).
Author:  emsvitil [ Thu May 11, 2006 2:18 pm ]
Post subject: 
I think you also get rid of the problem of having the pistons way down the hole with the 2.2 pistons.............
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