I have always wanted to see a piston swap of 18.5:1 with the bowl vs a shaved piston 18.5:1 and no other changes. Engine dyno would be neat to see power differences, but also get them a set load and just burn 1/4 gallon of fuel till empty for mpg.Mahle offered pistons with two different Ricardo bowl depths. One was .158" The other was .064" I believe this was how the compression was lowered on the 6.5 but I never confirmed it. I've always wondered if compression was lowered on purpose or they increased the bowl depth to help with the dual swirl. Anyway if your going to have a set of pistons machined down I would suggest using the deeper bowls so you don't end up effecting the combustion process. I'm a big believer that the Ricardo bowl is necessary on an IDI and it should not be removed to lower compression.
I believe Mahle still offers the .010 decked pistons. Personally I would leave the compression stock myself. Guys are pushing square cups and stock compression to 500hp with great success.
I would like to see information on that. Ive never come across that before. We need @n8in8or to measure some pistons for us. he has probably collected every version of the 6.5 ever built by nowI thought I remembered reading that they changed the pin height
Same here. I have research papers that show the dual swirl in detail. But I would love to see a comparison on a machined piston like what TSP does.I have always wanted to see a piston swap of 18.5:1 with the bowl vs a shaved piston 18.5:1 and no other changes. Engine dyno would be neat to see power differences, but also get them a set load and just burn 1/4 gallon of fuel till empty for mpg.
Then now with the way TSP has the taper cut to flare out across the piston- since I bought a set I obviously think that will do well.
There is the computer simulation of liquid/air flow- that would be great to see the difference- but wouldn’t be as accurate as to what end results are.