When Ray speaks sometimes...

I think he's speaking a foreign language so I've been determined to get some skillz!! I've decided to start posting what I learn. Let's see if you are SMARTER THAN A GIRL?? ;) For the "Racers" out there... here are some SPEED SECRETS you may or may not know. For the "Average Joe" and I... I've translated Ray's opinion into NORMAL people words ;) on Donut Dome Pistons....

 

Advantages of the Donut Dome Piston in high boost applications:
 
RACER NOTES: So why is this Donut Dome better than the rest…...it provides low compression for your high boost application!!
 
AVERAGE JOE & I NOTES: How about a 427 cubic inch with 8.1:1 compression? Sound good? Apparently that is very good. The lower the compression the more boost you can throw at it. Upon boosting an engine, with boost, you can increase the compression of the air over the pistons by double or triple the original atmosphere. That is a lot of stress on parts. You wouldn’t want to double or triple a compression of 14:1, your engine will leave a trail of pieces behind.
 
RACER NOTES: These forged pistons are perfect for a high performance LS engine. The Asymmetrical Forged Side Relief design is engineered to handle high power normally aspirated and forced induction LS engines. An exclusive asymmetrical skirt maintains a larger skirt area on the heavily stressed major thrust side, while reducing friction with a smaller skirt on the minor thrust side.
 
AVERAGE JOE & I NOTES: A few advantages of the Donut Dome design include the asymmetrical skirts.
The skirts are indicated as “minor” or “major” and are asymmetrical to fit the job they are required to do. The “minor” can be smaller to reduce friction but the “major” is larger to withstand the stresses placed upon it. The “struts” between reinforce the overall piston and give added strength to the skirts that most pistons don’t have.
 
 
The R/D packed into this piston results in a high strength, lightweight, piston that will outperform the competition!
 
The bowl shape of the Donut Dome piston reduces the compression because of the added volume of the bowl to the combustion volume. This reduction in compression reduces detonation risk in boosted applications. The distinct bowl shape controls air and fuel movement as the piston comes up for the compression stroke. A vortex of air and fuel swirls creating a better mixture inside the piston bowl before combustion takes place. A better fuel/air mixture will result in a better and more efficient combustion, which leads to more power.
 
 
RACER NOTES: Pistons also feature:
• Accumulator Grooves
• Offset Wrist Pin
• Double Pin Oilers
 
AVERAGE JOE & I NOTES: Pistons also feature:
• Accumulator Grooves - is a small groove machined between the top and second ring. It provides additional volume where residual combustion gases that have “blown by” the top ring can collect. This additional volume helps to reduce pressure between the top & second ring, thus aiding in top ring seal and minimizing ring flutter.
• Offset Wrist Pin - Offset of the wrist reduces piston slap. Offset pins can also change the angle the rod is positioned on the crankshaft affecting torque.
• Double Pin Oilers - deliver twice the amount of oil to the wrist pin as compared to the standard single pin oiler. These are oil passages that connect oil scraped off the cylinder wall directly to the wrist pin bore.
 
I'll be adding more "Average Joe & I" tech talk to our website at www.RaymacRacingEngines.com. If you have a speed secret or engine building topic you would like "translated" shoot me a message and I'll see what we can learn!
 
Sherrie (2/1/18)
RaymacRacingEngines.com

 

Navigation

 


 


SBC Custom Kits:  383 Complete Engine Kit  •  383 Stroker Kit/Stage 1  •  383 Stroker Kit/Stage 2  •  383 Stroker Kit/Stage 3  • 383 Stroker Kit/Stage 4  •  427 SBC All Aluminum  •   434 SBC 650hp


SBC Custom Builds:  400 SBC All Aluminum  •  400 SBC N2O Street/Race •  400 SBC Dart SHP  •  427 SBC Short Block  •  434 SBC 650hp on Pump Gas


BBC Custom Kits:  496 BBC Forged Power  •  540/496 BBC Pro Street/Strip • 540 Short Block July 4th & SUMMER SALE •  540 BBC All Aluminum Long Block  •  540 BBC Rotating Assembly  •  540 BBC Pump Gas 650hp  •  540 BBC Pump Gas 810hp  •  540 BBC Street/Strip N2O  •  540/550/565 BBC Blower Motor  •  565 BBC Forged Rotating Assembly  •  565 BBC Sportsman Rotating Assembly  •  565 BBC Super Street  •   565 BBC 900hp   •  582 BBC Forged Rotating Assembly  •  598 BBC 1064hp  • 598/632 BBC Drag/Race •  605 BBC Mild/Wild622 BBC All Aluminum 1050hp  •  632 BBC Short Block  •  632 BBC Big Chief Short Block Kit  •  632 BBC Big Chief Long Block Kit  •  632 Big Chief 14 Degree Pump Gas Kit  •  632 BBC Block & Rotating Assembly   •   632 BBC MED Duty NOS   •   632 BBC SR20 NOS   •  632 "Patriot" Complete Kit  •  632 BBC Street Race Rod Kit  •  632 N2O 1800hp •  632 1000hp  •  665 BBC 14.5 Degree  •  665 BBC Idles at 800rpm  • 705 BBC 14.5 Degree  •  715 BBC N2O •  747 BBC Torque Monster

BBC Custom Builds: 555 BBC Bracket Motor 900+hp  •  632 BBC SR20/12 Engine Kit  •  632 BBC SR20 NOS
  •  632 BBC Heavy N2O Options  •  665 BBC Heavy N2O  •  747 BBC Torque Monster


SBF Custom Kits:  347/363 SBF Rotating Assembly  •  427 SBF Short Block   •   427 SBF 700hp

BBF Custom Kits:  429/460 BBF Rotating Assembly


BBF FE Custom Kits:  360/390 BBF FE Rotating Assembly & Long Block


Ford Modular Custom Kits:  Ford Coyote Boss 5.0

 


LS Based Custom Builds: 502 LS Short Block Assembled


LT1 Custom Kits:  LT1 Rotating Assembly


Gen VII (8.1) Custom Kits:  8.1L with Options


Mopar Custom Kits:  MOPAR 440 into a 500/545


Industrial:  505 8.3 Liter  •  535 8.8 Liter  •  632 10 Liter  •  598 9.8 Liter  •  732 12 Liter  •  747 Torque Monster

Callies Dragonslayer:  SBC   •  BBC  •  LS1 GEN II-IV  •  SBF


Callies Magnums:  SBC  •  BBC  •  LS1 GEN III-IV  •  SBF  •  460 Ford  •  440 & Hemi Mopar


Cast Pro Stock:  SBC 350 Int  •   SBC 350 Ext  •  SBC 350 Late Int  •  SBC 350 Late Ext  •  SBC 400 Ext   •  BBC 454 Ext   •  BBC 454 Late  •  Ford 351W  •  BBF 460 

Aluminum Blocks:  Chyrsler 440W  •  BMP BBC  •  54902 RHS LS Bare Race  •  54907U RHS LS Solid AL  •  54908U RHS LS Solid AL  •  SBC Brodix 410 Sprint  •  SBC Brodix 400/4.125 Bore •  SBC Brodix 350/4.125 Bore  •  SBC Brodix 400/4.00 Bore  •  SBC Brodix 350/1.00 Bore

Ignition:  Distributors & Starters

CNC Cylinder Heads:  SBC 190cc 23 Degree  •  LS Series  •  BBC 360cc 24 Degree


BBC Dart Cylinder Heads: Dart 360


BBC Aluminum Entry Level Cylinder Heads:  Aluminum Entry Level + Flow Chart


BBC Brodix Cylinder Heads:  Brodix BB1


BBC RHS Cylinder Heads:  RHS Pro Action

BBC Pistons:  BBC Big Chief Piston Set


 

A few of our ultra performance kits, builds, components & parts:

                                                            

    

 


SuperFlow Dyno on location at Raymac Racing Engines. Click to watch:

            

 

Contact Raymac Racing Engines

       This email address is being protected from spambots. You need JavaScript enabled to view it.  

Call us for a free quote!

817.705.5424   or  940.594.0350

Office: Mansfield, Texas       Shop/Dyno: Ft. Worth, Texas

All products are subject to availability. Customizing a part may delay shipping. All prices are subject to change.

09/05/18 California law now requires any reseller of California based manufactured parts (including by not limited to Dart, Race Winning Brands, AFR, Scat and Brodix) to inform it's customers of the following

(in accordance with Proposition 65):

 

TOP

Style1

Style2

Style3

Style4

Style5

Style6

Style7

Style8

Style9

Style10