D- or round dish pistons for Iron CJ's (460)
4 posters
Page 1 of 1
D- or round dish pistons for Iron CJ's (460)
Planning to get custom pistons for 460 Iron CJ build. Have a choice between different dish shapes for adjusting the compression ratio. Which type of dish to get, having the choice?
Calypso- Posts : 71
Join date : 2011-11-28
Re: D- or round dish pistons for Iron CJ's (460)
Calypso wrote:Planning to get custom pistons for 460 Iron CJ build. Have a choice between different dish shapes for adjusting the compression ratio. Which type of dish to get, having the choice?
"Reverse Dome"
Calypso likes this post
Re: D- or round dish pistons for Iron CJ's (460)
It depends on how much volume you need. 20 or more might have to be round. The diameter of the round dish is the critical factor versus a "mirror image" dish.
gt350hr- Posts : 662
Join date : 2014-08-20
Location : Anaheim , CA
Calypso likes this post
Re: D- or round dish pistons for Iron CJ's (460)
duplicate post
gt350hr- Posts : 662
Join date : 2014-08-20
Location : Anaheim , CA
Re: D- or round dish pistons for Iron CJ's (460)
gt350hr wrote: It depends on how much volume you need. 20 or more might have to be round. The diameter of the round dish is the critical factor versus a "mirror image" dish.
Good point. What I need for 10-10.5:1 is 10-15cc dish.
Out of curiosity, is it preferable to keep the round dish diameter in the small side to retain squish/quench, or will it work better with a narrow squish band?
Calypso- Posts : 71
Join date : 2011-11-28
Re: D- or round dish pistons for Iron CJ's (460)
The "minimum" I use is .375 wide. I found that out courtesy of my former Nascar customers. We did allot of testing when we were doing the spherical dish program back then. Less that .375 liked to detonate easier. The squish is certainly more critical on cast iron heads than aluminum and much less critical when "boosted".
gt350hr- Posts : 662
Join date : 2014-08-20
Location : Anaheim , CA
Re: D- or round dish pistons for Iron CJ's (460)
gt350hr wrote: The "minimum" I use is .375 wide. I found that out courtesy of my former Nascar customers. We did allot of testing when we were doing the spherical dish program back then. Less that .375 liked to detonate easier. The squish is certainly more critical on cast iron heads than aluminum and much less critical when "boosted".
Thank you. Are you (still) in the piston business?
Calypso- Posts : 71
Join date : 2011-11-28
Re: D- or round dish pistons for Iron CJ's (460)
Yes but I don't go on forums to promote the fact. I am here to learn and help when I can. PM me if you like about my day job.
gt350hr- Posts : 662
Join date : 2014-08-20
Location : Anaheim , CA
Calypso likes this post
Re: D- or round dish pistons for Iron CJ's (460)
Calypso wrote:gt350hr wrote: It depends on how much volume you need. 20 or more might have to be round. The diameter of the round dish is the critical factor versus a "mirror image" dish.
Good point. What I need for 10-10.5:1 is 10-15cc dish.
Out of curiosity, is it preferable to keep the round dish diameter in the small side to retain squish/quench, or will it work better with a narrow squish band?
At that volume, even weight isn't an issue. Reverse Dome.
Mark O'Neal- Posts : 286
Join date : 2009-08-12
Re: D- or round dish pistons for Iron CJ's (460)
+1 dish volume is low enough that an inverted dome would be better with the quench pads.
gt350hr- Posts : 662
Join date : 2014-08-20
Location : Anaheim , CA
Re: D- or round dish pistons for Iron CJ's (460)
Curious about even weight. When does that become an issue and why?
Calypso- Posts : 71
Join date : 2011-11-28
Re: D- or round dish pistons for Iron CJ's (460)
Calypso wrote:Curious about even weight. When does that become an issue and why?
As more depth is required, the piston deck has to be increased to accommodate.
Two things happen. First, at some point the weight increases more than you might like, second, the space available for the rod is decreased.
Either way, those of use that "design" pistons can do anything we want....as long as Newton agrees.
Mark O'Neal- Posts : 286
Join date : 2009-08-12
Similar topics
» WTB 429 Dish top pistons 4.420 .060
» KB Pistons. Can I mill a dish in the flat tops?
» 429 23cc dish pistons
» Future build round table
» Looking for 4.440 1.250ch A460 pistons flat top or dish
» KB Pistons. Can I mill a dish in the flat tops?
» 429 23cc dish pistons
» Future build round table
» Looking for 4.440 1.250ch A460 pistons flat top or dish
Page 1 of 1
Permissions in this forum:
You cannot reply to topics in this forum
|
|