Diamond Pistons Specs

[bobafett]

adam put in some super small b16 pistons and it appeared to fit, but we were not sure about the height and we couldnt run them, because they were far far too small. nobody has actually taken the time to bolt a head on and see... however, for the cost of B-pistons (new ones anyway) you might as well get custom pistons made.

[hondaman1986]

adam put in some super small b16 pistons and it appeared to fit, but we were not sure about the height and we couldnt run them, because they were far far too small. nobody has actually taken the time to bolt a head on and see... however, for the cost of B-pistons (new ones anyway) you might as well get custom pistons made.

ok jw thanks boba

edit: boba how much did your pistons cost?

[bobafett]

i think it was about $550 from diamond racing with pins, rings, locks, etc.... everything
I believe I dealt with eric or ron.. they were both super helpful if I get their names right both of those guys would be good to help you out!

[hondaman1986]

i think it was about $550 from diamond racing with pins, rings, locks, etc.... everything
I believe I dealt with eric or ron.. they were both super helpful if I get their names right both of those guys would be good to help you out!

awesome!!! ill hit tem up and see what they will give me on a price. "goes my money lol"

[MessyHonda]

i think it was about $550 from diamond racing with pins, rings, locks, etc.... everything
I believe I dealt with eric or ron.. they were both super helpful if I get their names right both of those guys would be good to help you out!

what kind of rods are you using?

[bobafett]

eagle h-beam rods for an ls integra.

something like this:
http://cgi.ebay.com/ebaymotors/Honda...QQcmdZViewItem

[hondaman1986]

eagle h-beam rods for an ls integra.

something like this:
http://cgi.ebay.com/ebaymotors/Honda...QQcmdZViewItem

how well did the whole thing turn out?

[bobafett]

needs engine management at the moment. it runs, but not too well. its WAY too rich and throws EGR codes.

but if you look at the setup i am running its not suprising... these pistons and rods are definitely fine to run.

[A20A1]

Custom Piston Specs: Job # 22507
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Bore: 3.307" (remember, this is +.050 overbore)
Compression Height: 1.167
Effective Volume: -11.9
Intake Valve Depth: .125
Exhaust Valve Depth: .077
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Top Ring: 1.2M
2nd Ring: 1.2M
Oil Ring: 2.8M
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Lock Ring Decription: SPIROLOX DBL
Lock Ring Part Number: #01-5000
Wrist Pin Diameter: .827"
Wrist Pin Length: 2.500"
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Piston Weight: 328 Grams
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Note: Install these pistons with .0040 clearance measured 90 degrees to the pin hole @ .850"

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Custom Piston Information: (These are the numbers that were sent to Diamond for them to make my pistons)
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Finished Bore Size: 3.307" (big)
Stroke: 3.583"
Rod Length: 5.394"
Compression Distance: 1.167"
Block Deck Height: 8.352"
Desired Piston to Deck: 0
Piston Type: Dish
Ring Groove Info:
Top: 1.2mm
2nd: 1.2mm
Oil: 2.8mm
Radial Widths:
Top: .125"
2nd: .144"
Oil: .105"
Support Rail: Yes - 019012276
Rings With Order: Yes
Part Number: CR-3794 (STD)
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Wrist Pin Info:
Diameter: .827"
Length: 2.500"
Pins With Order: 4130 (std)
Wall Thickness of Pin: .145
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Pin Lock Type:
Double Spiral: .042"
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Other Order Info:
Quantity: 4
Engine Type: Honda
Application: Street/Strip
Desired Compression Ratio: 8.5:1
Cylinder Head: 12v A20A
Casting #: PJ0 / HF7
Chamber Volume: 47.6cc
Comp. Gasket: .050"
Gasket Bore Dia.: 3.340"
Known Gasket Volume: 7.1cc
Rod Info:
Material: Steel
Small End Width: .785"
Thickness Above Pin: .203"
Piston Material: 2618
Skirt Shape: Ribbed Side Relief
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Misc Engine Information:
Approx Engine Only HP: 150
Combined HP: 350
Power Adder Information:
Type: Turbo
Pressure Max: 20 psi
Fuel Type: Gasoline
Octane Rating: 91 Minimum
Notes: .180 Crown Min. Brushed Rod.
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Shall I continue?
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Compression Ratio Calculator Results:
Number of Cylinders: 4
Bore: 3.3070"
Stroke: 3.5830"
Rod Length: 5.3940"
Gasket Bore: 3.340"
Comp. Gasket: .050"
Block Deck Height: 8.3520"
Top Ring Down: 0.210" ------ 20PSI Boost
Chamber Volume: 47.6
Dome(-) Dish(+): 12.00"
Piston / Deck: 0.000"
Calculated Values:
Total Volume: 571.78
Cylinder Volume: 504.32
Clearance Volume: 67.45
Gasket Volume: 7.18
Top Ring Volume: 0.68
Deck Volume: 0.00
Piston Top Land: 3.269
1/2 Stroke: 1.792
Comp Height: 1.167
Cubic Inches (lol): 123.10
Compression Ratio: 8.48:1
-----------------------------------------
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Another page of crap I have from them:
Base Engine Inputs:
Bore: 3.3073"
Stroke: 3.583"
Cylinders: 4
Rod Length: 5.394"
Deck Height: 8.3582"

Chamber / Piston Inputs:
Chamber CC's In Head: 47.6
Piston Design: Flat Top w/valve relief (i have dished pistons, they probably don't need this for their calculations to work)
Valve Reliefs: 12cc's
Gasket Thickness: .050"
Gasket Bore Diameter: 3.340"
Deck Height Clearance: 0.00"
Piston Ring Depth: 0.21"
Piston Top OD: 3.236"
Compression Height: 1.173"

Calculated Results:
Cylinder Size: 30.78 cubic inches / 504.5 cc's / 0.505 liters
Engine Size: 123.12 cubic inches / 2018 cc's / 2.018 liters
Chamber Size: 4.15 cubic inches / 68 cc's / 0.068 liters
Compression Ratio: 8:41
Bore/Stroke Ratio: .923
Rod/Stroke Ratio: 1.505

Volume Contributions:
Head Chamber: 2.904 cubic inches / 47.6 cc's / 70% of total
Gasket: 0.438 cubic inches / 7.18 cc's / 10.6% of total
Deck: 0 / 0 / 0
Valve Reliefs: 0.732 cubic inches / 12 cc's / 17.6% of total
Piston OD: 0.077 cubic inches / 1.26 cc's / 1.9% of total

so you have a 83.9978mm - 84mm bore? I thought somewhere else you said you had a 83.5mm bore. Maybe that was someone else.

[bobafett]

84mm bore...

[hondaman1986]

cant you just send in a stock piston and have them make a forged piston set off of it?

[bobafett]

Yeah they will need a stock piston regardless of what you do. But since you are then getting a 'custom' piston it is worth it to do the little tweaks that make it better.

such as 21mm pin so you can take your pick of LS rods, changing the position of the rings (help prevent blowing up ringlands - not sure on the details of this one, but I know it happened on my set) etc etc...

But yes I'm sure they could just clone a stock piston, though I am not sure why you would want to do that.

Seriously I would just call them up and pick their brain, they are super helpful and will probably have ideas for you if you just ask them what are some of the common tweaks or upgrades.