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Do It Yourself Guides (Howto) HowTos, Technical Data and Documentation for the 4G Eclipse


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Old February 28th, 2014, 12:32 PM   #1 (permalink)
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Order Pistons - What you need to know

For anyone else ordering pistons, here's the data I provided Ross Pistons on my order. I also put an order in for a head gasket set from Cometic.

Cometic Head Gasket Specs
Phone # (800)752-9850
Their Engine Code on file: 4G6G75
Part# H34551040S (can adjust for any overbore size)
Head Gasket Bore: 96mm (OEM stock)
Thickness: .040" (Can do any thickness upon request)
Cost: $98.24 each

Ross Pistons
Phone# 310-536-0100
Job Card #: 127619
Cylinder bore: 95mm (OEM stock)
Piston Stroke: 90mm
Oil Ring Support (ORS):ORS-378
Combustion Volume: Pentroof
Head CC's: 65cc
Piston Pin Diameter: 22mm
Block Height: 228mm
Cylinder Head Height:120mm
Rod Lengths: 6.040"

Cost Break Down
Pistons 83-20: $112.96 each
Pins 866-02-250: $11.95 each
ORS: $7.68 each
Rings Custom-CS-06: $179.60 Set
Slipper Skirt forgings and forged side reliefs at no additional cost (upon request only)

Total Price w/o Shipping $975.12


FSM Info for 6G75

Valve Info
Intake:
Over all length -4.304"
Head diameter -1.437"
6mm valve stem

Exhaust:
Over all length -4.470"
Head diameter -1.260"
6mm valve stem







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First Ever Documented GS V6 Swap Completed: <-- Click me!

Who's selling their 4G next
Boosted V6 Swap, Ross Pistons 9:1 compression, H-beam Forged Rods, Comp Cams Valve Springs, Ripp Mods SDS Vortech V5G Stage II @ 8psi.

Last edited by trevroar; May 23rd, 2014 at 02:22 PM.
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Old February 28th, 2014, 12:35 PM   #2 (permalink)
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Awesome idea. repped!
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Old February 28th, 2014, 12:41 PM   #3 (permalink)
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stock head CC is 65 cc's

from the valve face surface to the deck surface, the angle is 25 degrees for both the intake and exhaust, the angle from the valve stem to the deck surface is 65 degrees, in other words, from the valve stem to the cylinder head's centerline (veiwing from the top of the cylinder head) is 25 degrees, just specify that your heads use pent house roof combustion chambers
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Old February 28th, 2014, 01:55 PM   #4 (permalink)
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Thanks fellas! Much appreciated. I'll make sure I put something comprehensive up in the first post once all is said and done.
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First Ever Documented GS V6 Swap Completed: <-- Click me!

Who's selling their 4G next
Boosted V6 Swap, Ross Pistons 9:1 compression, H-beam Forged Rods, Comp Cams Valve Springs, Ripp Mods SDS Vortech V5G Stage II @ 8psi.
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Old February 28th, 2014, 04:00 PM   #5 (permalink)
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Just got off the phone with Mike again... we filled in a few more blanks on ordering the pistons. I still need to provide him with head gasket information. Does anyone know the specs off hand for an OEM gasket from the dealer. Need to know the thickness, and diameter for cylinders.
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First Ever Documented GS V6 Swap Completed: <-- Click me!

Who's selling their 4G next
Boosted V6 Swap, Ross Pistons 9:1 compression, H-beam Forged Rods, Comp Cams Valve Springs, Ripp Mods SDS Vortech V5G Stage II @ 8psi.
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Old February 28th, 2014, 09:54 PM   #6 (permalink)
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the stock head gasket bore diameter is ~96.32 mm (measurements are done with digital calipers, not a bore gauge), thickness is roughly 0.38 mm (also done by digital calipers)
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Old February 28th, 2014, 10:04 PM   #7 (permalink)
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pin diameter is 0.866 inches/22 mm, go by the dimension given by whoever makes your connecting rods, you also don't need to use oil ring support rail if you are going naturally aspirated/low levels of nitrous (thinner crown), my CP's are like this

anybody know the exact diameters of the intake and exhaust valves?

also worth noting, you can get these pistons with slipper skirt forgings and forged side reliefs at no additional cost
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Old March 3rd, 2014, 09:53 AM   #8 (permalink)
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Thanks for the info Fox! I'll be boosting between 8-12lbs... so do you feel that the ORS are necessary?
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First Ever Documented GS V6 Swap Completed: <-- Click me!

Who's selling their 4G next
Boosted V6 Swap, Ross Pistons 9:1 compression, H-beam Forged Rods, Comp Cams Valve Springs, Ripp Mods SDS Vortech V5G Stage II @ 8psi.
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Old March 3rd, 2014, 12:48 PM   #9 (permalink)
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Quote:
Originally Posted by fox_brand View Post
the stock head gasket bore diameter is ~96.32 mm (measurements are done with digital calipers, not a bore gauge), thickness is roughly 0.38 mm (also done by digital calipers)
Fox, when I told Mike the thickness of the headgasket, he was concerned that it was very thin.... Not to doubt you, but only to double check.... are we sure about the .38mm thickness?

This pic is promising... but still want to make sure

__________________
First Ever Documented GS V6 Swap Completed: <-- Click me!

Who's selling their 4G next
Boosted V6 Swap, Ross Pistons 9:1 compression, H-beam Forged Rods, Comp Cams Valve Springs, Ripp Mods SDS Vortech V5G Stage II @ 8psi.
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Old March 3rd, 2014, 02:14 PM   #10 (permalink)
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Nevermind... just went with Cometic Headgasket
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First Ever Documented GS V6 Swap Completed: <-- Click me!

Who's selling their 4G next
Boosted V6 Swap, Ross Pistons 9:1 compression, H-beam Forged Rods, Comp Cams Valve Springs, Ripp Mods SDS Vortech V5G Stage II @ 8psi.
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Old March 4th, 2014, 01:40 AM   #11 (permalink)
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Quote:
Originally Posted by trevroar View Post
Thanks for the info Fox! I'll be boosting between 8-12lbs... so do you feel that the ORS are necessary?
you should talk to Ross about this, it might be over kill, then again, over kill implies that it is working, the general theory of forced induction (and nitrous oxide) versus naturally aspirated, through my reading, N/A, you want to top ring land as close to the crown without compromising strength as possible to increase sealing, efficiency, and cutting down on dead space between the crown and the top ring land. With forced induction (and nitrous oxide), it is more of increasing strength of the crown
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Old March 4th, 2014, 01:41 AM   #12 (permalink)
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yeah, that picture is more or less what I'm going off of
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Old March 4th, 2014, 09:06 AM   #13 (permalink)
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Mike at Ross Pistons says use them for FI, so they're included in the order... they aren't overly expensive anyways.
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First Ever Documented GS V6 Swap Completed: <-- Click me!

Who's selling their 4G next
Boosted V6 Swap, Ross Pistons 9:1 compression, H-beam Forged Rods, Comp Cams Valve Springs, Ripp Mods SDS Vortech V5G Stage II @ 8psi.
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