Stoker Engines

[Langbolt]

Its not that you can't use other cylinders. The point is if you have the correct combustion chamber shape, and the correct porting the engine will make a lot more power. I don't care what anyone else does, nor do I care who agrees with me. I am explaining why I am not interested in building an Engine that is not put together correctly and sharing the results of our research.

Hi Arlen,

Would it make sense to make a specific SLEEVE for the +4mm Stroke ?....That way the Port timing and Port Areas would be perfect for the increased Stroke

I did that to a motor I built a few years ago for a 72mm Bore kit on an OEM Cylinder and it worked really well. The Roofs & floors of the ports were where they should be.

[jcs003]

Its not that you can't use other cylinders. The point is if you have the correct combustion chamber shape, and the correct porting the engine will make a lot more power. I don't care what anyone else does, nor do I care who agrees with me. I am explaining why I am not interested in building an Engine that is not put together correctly and sharing the results of our research.

well spoken.  this is one of the reasons why you are a top tier builder.

john

[ledperformance]

In the days before we had cylinders set for stroker cranks we lengthened the cylinders by running the top flange of the sleeve above the top of the cylinder. We then made a top spacer plate to lengthen the block as well. In some most cases we lowered the  the transfer roofs with lower port heights in the sleeve and reshaped the roof of the port with epoxy. That allowed us to increase the stoke up to 80 mm. The cost is high however because of the amount of labor required.

[mrtwidster1]

So is the CPI cylinder your only recomendation for a stoker?  Are other off the shelf cylinders good canidates as well?
Thank you

[ledperformance]

Both 85mm  Puma and 78mm Sphinx come in length appropriate for the 76mm (plus4) crankshafts.

[havinnoj]

So is the CPI cylinder your only recomendation for a stoker?  Are other off the shelf cylinders good canidates as well?
Thank you

Both 85mm  Puma and 78mm Sphinx come in length appropriate for the 76mm (plus4) crankshafts.

I think mrtwidster1 is asking if other cylinders, like those made by Pro-X/Niks and ESR, would run well in conjunction with a stroker crank.

[ledperformance]

All the cylinders will work if I make a custom sleeve, top spacer plate and lengthen the cylinder. It is less expensive however to use the Sphinx or Puma cylinder and they will make more hp.

[mrtwidster1]

Not trying to raise more concerns than needed, just trying to get a better understanding. if i wanted to run a Pro x type cylinder with a 4 mill stoker then the outlined work that you describe above applies to those cylinders as well?
Again I am trying to wrap my head around this concept. I am not disagreeing, I just did not understand the process.
Are there great advantages to stroking? If so what cc up do you recomend to stroke?
I ask because a different motor setup is in my plans for the future and I am liking what I have read about the sphinx setup verse's the Pro X style cylinder.

[ledperformance]

Do what ever you want as far as cylinders are concerned. If you use ESR or Pro-X use stock stroke. If you want to use the plus 4 crank use Sphinx or Puma. That is if you want LED to do the engine. Other builders are welcome to do it however they want.
I believe my stroker post explains the reasons pretty well.

[mrtwidster1]

Your advice in the last post closes this discussion for me. Thank you for your contributions it is appreciated. Really enjoy your videos!