rings for forced induction
rings for forced induction so i bought a set of cpcarillo bullet pistons for my 403 procharged build. going to be a f1-a seeing around 18lbs max boost.
they came with a set of standard with 1.5mm x 1.5mm x 3.0mm ring pack that consists of High-grade Steel Gas Nitirded barrel faced tops with Taper Hook Groove Napier second rings and a 3-piece soft nitrided rail flex vent oils, specially designed for severe duty applications such as nitorous blowers and turbo engine.
should i use these? i have always loved total seal rings. on my last build they were great. should i sell these and get total seal or keep em??
they came with a set of standard with 1.5mm x 1.5mm x 3.0mm ring pack that consists of High-grade Steel Gas Nitirded barrel faced tops with Taper Hook Groove Napier second rings and a 3-piece soft nitrided rail flex vent oils, specially designed for severe duty applications such as nitorous blowers and turbo engine.
should i use these? i have always loved total seal rings. on my last build they were great. should i sell these and get total seal or keep em??
The ring package that comes with those pistons are the reason I am going with those pistons for my LSA build. They are perfect for forced induction. The rings from most piston kits are not made by the piston manufacturer for the most part but by the small handful of piston ring manufacturers like Total Seal or others. You would be taking a loss and spending quite a bit extra to get a very similar if not the same rings.
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From: Norn Iron
Make sure you get the pistons intended for boost.
They dont tell you, the sales spiel doesnt tell you, and simply choosing the correct dish for your application doesnt get it right. But most of the CP Bullet pistons are n/a pistons with the top ring land sitting very high, close to the crown.
I've 8 nice shiny paper weights here though
They dont tell you, the sales spiel doesnt tell you, and simply choosing the correct dish for your application doesnt get it right. But most of the CP Bullet pistons are n/a pistons with the top ring land sitting very high, close to the crown.
I've 8 nice shiny paper weights here though
Originally Posted by stevieturbo
Make sure you get the pistons intended for boost.
They dont tell you, the sales spiel doesnt tell you, and simply choosing the correct dish for your application doesnt get it right. But most of the CP Bullet pistons are n/a pistons with the top ring land sitting very high, close to the crown.
I've 8 nice shiny paper weights here though
They dont tell you, the sales spiel doesnt tell you, and simply choosing the correct dish for your application doesnt get it right. But most of the CP Bullet pistons are n/a pistons with the top ring land sitting very high, close to the crown.
I've 8 nice shiny paper weights here though
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Joined: Nov 2003
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From: Norn Iron
When I asked...after I already bought a set that would meet my CR needs....they said they only had one set of pistons intended for boost. Although these would have dropped mine to near 8.0:1 which would be far too low.
Unless their range has expanded since then.
They were zero help when I contacted them about it too, maybe they have improved the sales BS used when they advertise pistons now so customers can actually make a proper decision.
If you spoke to them before buying, then I'd hope yours are indeed correct though
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How far down is the top ring from the crown ?
When I asked...after I already bought a set that would meet my CR needs....they said they only had one set of pistons intended for boost. Although these would have dropped mine to near 8.0:1 which would be far too low.
Unless their range has expanded since then.
They were zero help when I contacted them about it too, maybe they have improved the sales BS used when they advertise pistons now so customers can actually make a proper decision.
If you spoke to them before buying, then I'd hope yours are indeed correct though
When I asked...after I already bought a set that would meet my CR needs....they said they only had one set of pistons intended for boost. Although these would have dropped mine to near 8.0:1 which would be far too low.
Unless their range has expanded since then.
They were zero help when I contacted them about it too, maybe they have improved the sales BS used when they advertise pistons now so customers can actually make a proper decision.
If you spoke to them before buying, then I'd hope yours are indeed correct though
Last edited by SStressin; Oct 30, 2015 at 01:36 PM.
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If having the ring closer to the crown is a concern because of heat butting ring together, just run alot more ring gap and keep an eye on the chamber temps. Dont run it too hot. Watch egt. Keep it rich and timing lower to start and creep up on the tune.
Having a larger ring gap than necessary wont hurt power much but too narrow and butting up will cost you an engine. Have another talk to them about this. 3/16 inch seems really high up for a top ring tho
Having a larger ring gap than necessary wont hurt power much but too narrow and butting up will cost you an engine. Have another talk to them about this. 3/16 inch seems really high up for a top ring tho
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From: Norn Iron
The CP Bullet's I bought that would give me 9.0:1 CR have 4.3mm from top ring to crown
When you compare this to my old JE's or Wiseco's, it's wayy smaller. JE was around 6.8mm, and Wiseco a little over 7mm
Your 3/16 is around 4.7mm, still on the small side.
CP Bullet on the left that I bought for my 403 with 4" stroke a few years ago that are now paperweights.
Bullet, JE, Wiseco
When you compare this to my old JE's or Wiseco's, it's wayy smaller. JE was around 6.8mm, and Wiseco a little over 7mm
Your 3/16 is around 4.7mm, still on the small side.
CP Bullet on the left that I bought for my 403 with 4" stroke a few years ago that are now paperweights.
Bullet, JE, Wiseco
I was just talking to CP the other day about pistons, and the guy i spoke to had a different piston with the top ring further from the top. He told me about them after i mentioned about running boost, so you might call CP directly and talk to someone there about what part number you need to get the right pistons.
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From: Norn Iron