MILLER   PISTON SIZES,  WEIGHTS AND COSTS

Old size    Old weight     New  size   New weight                            


92.45           571 gr.              92.46           529 gr.     Coated Piston prices are $ 250  with free UPS.

92.83           579 gr.              92.84           537 gr.                       

93.06           552  gr.              93.56            546 gr 

93.82           607 gr.              93.83           547 gr.     Old style pistons are available while  supply lasts . 

                                                                                 Also have a few good used pistons of various sizes                  

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                  Bare piston weights.   Add 158 gr. for complete piston with upper bearing.

  


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                                                                     INSTALL RECOMMENDFATIONS

Compare piston weights to your pistons to maintain proper engine balance, pistons can be lighter and will run smooth. 

 36 to 1 premix and .006 clearance is recommended for rec riding., 

 32 to 1 for racing and  .008 clearance,    .010 max..

Injection oil system is not recommended for big bore strokers . Add 2 oz extra oil per gallon of fuel  for first tank full , 2 to 3 sec WOT,  then 1 oz extra per gallon for second tank full.  Vary the throttle, no long WOT pulls until after second tank full, and if you like to run WOT for long distances , be sure you're running a little rich with extra oil .  Using EGT's and keeping temps in the mid 1000's are a good way to tune as well as plug readings.

           REMEMBER:      OCTANE & OIL IS MUCH LESS COSTLY THAN PISTONS AND CRANKS.

                                          Also, moisture left in an engine is the #1 killer of cranks  and bearings.

Mel Millers recommended oils:

     1.    NEO ,  T2 oil   Miller formula

     2.    Klotz  KL200  Techniplate

     3.    Amsoil          Dominator

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From my boosted Miller   93.06 , +8 stroker

   hardly any wear in 3 years of running​

.0002 wear on sleeves and .002 on pistons

​    Coating and hone marks still visible

We chose to increase the size of all the pistons for 2 reasons, one is to separate our new ones ( different part number ) from the old style and second to give you a replacement piston of a slightly larger size to compensate for  the material removed when honing a cylinder.

Example, the old 92.83 will become a 92.84, which will be .01 mm larger or .0004 , that's tenths not thousands. That's generally the amount your bore will increase when honing for clean up. Pistons are otherwise interchangeable with the old style.

                            SLEEVES



           PISTONS and SLEEVES

             

             Sleeves I bought from Miller                                                                  Recent order of sleeves

               Need pistons or sleeves for your big bore engine ? 


Triple coated pistons for high performance longevity. The 2 obvious coatings is Wiseco's premium ceramic on top and the poly moly on the sides. Notice the grey color of the ring grooves , that is the third coating. It is a hard anodize that provides a hardened surface  for wear and lubricity that  allows the rings to seat better under a load.

    Miller kept a few other piston mods for himself and customers of his choice to be one up on the competition. Over the years,  I have purchased 10 different Miller engines as well as his personal race boat and I've added most of these mods to these new pistons.

   Look at the 93.06 pistons below as these have Millers mods and they have 3 years and 100 hours  of running in my experimental supercharged XPL. This engine mostly ran with 6 lbs of boost on higher compression and C16 fuel at 8000 rpms with either a 97.5 or Coffman pipe. I ran Millers - Neo oil at 36 to one and I've not found a better oil for engine durability.


                    Miller used coated pistons on all his engines.

                   100  pistons in all  sizes are in stock 

​                        No preorder needed and no guessing on size

.       Order the size you need from our inventory when you need them.


Kansas city area                     contact: rwosel@c-rmfg.com

                                                            

    The Miller designed big bore sleeves are produced by L A Sleeve Co, another long term supplier of Mel's. The steel alloy used shows almost no wear after hours and hours of hard running. See the pictures above of sleeves from my supercharged 2 stroke after 100 hours of boosted testing. The sleeves will only need .0002 / .0003 of honing to clean and true up. That's only one third of a thousands of an inch. The original hone marks are still visible.

   I keep a stock of big bore sleeves  that will service most all the 951 big bore Miller engines. Miller  has instructed me on the boring and fitting of sleeves and pistons.


                                                                 

  



                                                                        BIG BORE SLEEVES


We have 4 different big bore sleeves that will fit all  Miller Engines from a stock bore up to a  93.83

The most popular piston sizes are     92.46     92.84      93.07    93.56       93.83

Stock sleeves are 3.765 OD .  92.46 is largest size for rec riding.

 Stock sleeves are very thin and ask for  special boring instructions.

Big Bore sleeves are 3.865 and 93.07 is largest acceptable piston for racing , 93.56  for rec riding

947R and 1194R triple port  sleeves have a larger O.D. for  the largest piston. 93.83​

You must port all new sleeves  to match your old sleeves and cylinders and machine the top flange 

Sleeves need .003 / .004 press fit.  I can furnish  machining and installation instructions.  

PRICE per sleeve is $350 each   R type sleeves may be slightly higher. 


​                                                      ALL ARE  IN STOCK         AVAILABLE NOW