Forged piston options

[BATMANs]

That is horrible 8 grams between the lightest and heaviest piston. I have used CP pistons now for over 9 years and am a direct distributor and not once have I ever had a set that was this far off. Their pistons are always within 1 gram of each other. Same as with the piston sizing they are always identical. your pistons are almost .0005 different in size. this is critical considering you only run around .0035 of piston to cylinder wall clearance

I think that is well within OEM weight delta deviation, no?

 

[BATMANs]

............The model you have is by far our best performing on terms of reliability, consistency, and oil consumption...........A typical new engine will use ~ 1 qt in the first 1000 miles and taper down to less than 1/4 qt every 1000-2000 miles (forged pistons will always exhibit higher than factory oil consumption because of the growth characteristics - compared to the factory cast hypereutectic piston - the forged piston has a greater coefficient of thermal expansion making them smaller in the cylinder bore until they reach operating temperature). .........

A couple things I saw from your post:
- you cannot measure a coated piston the way you describe. The buildup of the coating varies approximately .001-.002", and this is not the true size of the piston. You state that the bore did not exceed 90.5mm, however, did you verify this? Customers have made the mistake of measuring the piston, then adding piston-wall clearance when in fact the piston has the clearance already built in (ie. .003" per side less than the spec of 90.5mm). This would result in the piston-wall clearance being double - .006"/side. Adding the coating will also make the piston-wall greater than what is recommended.
- please explain how you did your measuring of mass - I don't see how 8 gram is possible
- please verify the installation of the oil ring set - the oil ring rails should be at least 90 degrees apart and the expander must be properly butted, not over lapped.........

This seems to be with the Wiseco 2618 pistons that I have in the GTO. It's drinking more oil and the oil gets dirtier faster based on the cold piston metal that has contracted in size until it warms up.

Chris, do u recommend greater oil changing frequencies?

 

[whrdnsx]

Another factor to consider is how the rings were bedded in.
What oil was used during bed in?
What was your bed in procedure?

 

[stuntman]

+1 for CP Pistons. Used on the FXMD NSX to set all those track records. Great product.

 

[BATMANs]

Just got my forged 2618 alloy Wiseco in.

Top Thermo ceramic coating, anodized ring lands, wear coating on the side skirts and oil shedding coating beneath the pistons.

$1300 for the set with the coatings.

Direct from Wiseco.

 

[E-Nough Logic]

I've used CP pistons for 500, 600 and 900+whp 4 cylinder street cars. Never had a problem always the perfect size. I've seen plenty of success on other pistons, but CP/Carrillo will have my business.

 

[gsrboy]

I've used CP pistons for 500, 600 and 900+whp 4 cylinder street cars. Never had a problem always the perfect size. I've seen plenty of success on other pistons, but CP/Carrillo will have my business.

x2

 

[BATMANs]

The Wiseco pistons are about 20 grams lighter than the old ones (granted that the ring lands were still intact).

 

[kookoo4nsx]

Wow, bats........all that carbon buildup on the stock pistons look like a piston out of an old smokey 2 stroke V6 Yamaha I once rebuilt, You had some serious carbon issues going on.

The Wiseco pistons are about 20 grams lighter than the old ones (granted that the ring lands were still intact).

 

[synergy004]

x2

x3 I use the same set up, I noticed less piston slap with these also.

 

[BATMANs]

x3 I use the same set up, I noticed less piston slap with these also.

did u use other brands? if so please share....