When I started planning my stroker build, I was looking at a budget stroker and the kb pistons weren't on the drawing table yet. So this was my plan and I still might go with it.
Cp802 pistons (1.592 comp distance)
258 (5.875 rod)
7120 head (increased combustion chamber 61.4cc, sbc stainless valves)
12 weight crank
Four wheeler magazine did a 4.6 stroker write up. They said they measured the 802 pistons and calculated the ring land groove and came up with total piston cc @ 18.8cc. Using KB's piston calculator I come up with static compression ratio @ 9.588. Using 61cc head, 18.8 piston head volume, .043 gasket thickness, 4.0 gasket bore, 3.905 cylinder bore, 3.895 stroke, .002 deck clearance for a total quench of .045.
DCR= 8.73 using the cam specs for the crane 901 cam (although I WILL NOT use a crane cam) I just wanted to see what dcr I might have.
I can lower the comp ratio a little if I open the quench a little.
Comments?
One of my options
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- Donator
- Posts: 1201
- Joined: February 13th, 2008, 6:20 pm
- Stroker Displacement: 4.6
- Vehicle Year: 2003
- Vehicle Make: Jeep
- Vehicle Model: Wrangler
- Location: Atlanta, Ga
- Flash
- I love JeepStrokers.com!!
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- Joined: February 17th, 2008, 10:45 pm
Re: One of my options
On thing that i would do before you buy anything is have you deck hight check so you no exactly what yours is, and then replug the numbers in.
There might be quite a variation between blocks..................
at .045 quench you shouldn't have a problem with that compression.
Flash
There might be quite a variation between blocks..................
at .045 quench you shouldn't have a problem with that compression.
Flash
89 XJ with 300,000 on the original eng
"I've also never completed a motor, yet. My mouth (fingers) is also writing checks my ass can't cash."
"I've also never completed a motor, yet. My mouth (fingers) is also writing checks my ass can't cash."
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- Donator
- Posts: 1201
- Joined: February 13th, 2008, 6:20 pm
- Stroker Displacement: 4.6
- Vehicle Year: 2003
- Vehicle Make: Jeep
- Vehicle Model: Wrangler
- Location: Atlanta, Ga
Re: One of my options
The block will be decked to piston .002 below the deck with .043 head gasket.
- gradon
- Donator
- Posts: 1353
- Joined: February 13th, 2008, 5:33 pm
- Stroker Displacement: 4.6/280ci
- Vehicle Year: 1996
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- Vehicle Model: Cherokee
- Location: DC
Re: One of my options
Yeah I didn't measure the deck height, but after the supposed .030" decking which should've left the piston .0085" below deck, my piston was actually .0105" below deck, so I could attribute that to the variance in the block. I now use .028" for the amount decked(for the calc).
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