bbc gas ported pistons
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bbc gas ported pistons
So I just brought in a set of wiseco pistons for a customer. The motor is a 565 BBC with 10.8 CR and nitrous. They were supposed to have vertical gas ports but they don't. The customer already has a set of hellfire rings. Is there any big problem with just using the pistons as they are ? Or should I ship them back (big pain because i'm in Canada). The part number is K0245A100
Brian
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Re: bbc gas ported pistons
Pistons I order with gas ports have zero vertical clearance on the ring lands. If yours has over .0015", I'd say you can use them as is.
Monty Frerichs
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Re: bbc gas ported pistons
so that's measured with a feeler gage between the ring and the land ?
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Re: bbc gas ported pistons
Wow, what is your reasoning for ordering pistons with zero ring clearance for gas port applications?
Bill
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Perfect Circle Doctor of Motors certification
SAE Member (30 years)
ASE Master Certified Engine Machinist (+ two otherASE Master Certifications)
AERA Certified Professional Engine Machinist
Re: bbc gas ported pistons
Way less chance for flutter. Ability to lap rings.engineguyBill wrote: ↑Wed Mar 14, 2018 6:06 pmWow, what is your reasoning for ordering pistons with zero ring clearance for gas port applications?
Monty Frerichs
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Re: bbc gas ported pistons
Were the rings specced out for gas ports? If so, the tension might be on the low side for an un-ported application.(and if they weren't, the gas ports would have been less effective.)
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Re: bbc gas ported pistons
Lapping rings has pretty much gone the way of points and condensers . . . . . . .SupStk wrote: ↑Wed Mar 14, 2018 10:54 pmWay less chance for flutter. Ability to lap rings.engineguyBill wrote: ↑Wed Mar 14, 2018 6:06 pmWow, what is your reasoning for ordering pistons with zero ring clearance for gas port applications?
Current high performance pistons have, for the most part, very consistent groove dimensions and flatness. High performance rings are also spot-on as far as dimensions are concerned, therefore you can order rings/pistons with .0010" (or less) side clearance and rest assured that the clearance will be consistent throughout the circumference of the ring/groove. It is actually possible to do more harm than good when lapping rings. Yeah, I know - some guys still do it.
Bill
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Re: bbc gas ported pistons
Generally speaking, rings used for gas port application will be thin axial width along with thin radial thickness, which will result in proper tension for the gas ports to work properly.
Bill
Perfect Circle Doctor of Motors certification
SAE Member (30 years)
ASE Master Certified Engine Machinist (+ two otherASE Master Certifications)
AERA Certified Professional Engine Machinist
Perfect Circle Doctor of Motors certification
SAE Member (30 years)
ASE Master Certified Engine Machinist (+ two otherASE Master Certifications)
AERA Certified Professional Engine Machinist
Re: bbc gas ported pistons
Yes, so it will be important to verify if it's just that the gas ports were omitted or if the groove depths are also incorrect for the customer's rings.
If nothing else, that Wiseco p.n. is cataloged as having gas ports, so a credit would be in order for the option price.
If nothing else, that Wiseco p.n. is cataloged as having gas ports, so a credit would be in order for the option price.
Felix, qui potuit rerum cognscere causas.
Happy is he who can discover the cause of things.
Happy is he who can discover the cause of things.
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Re: bbc gas ported pistons
thanks for the help guys. I'm returning them. My customer already has rings that are made for gas ported pistons.
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