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I5 extreme! spoke with jonus about my engine, and general discuss
Mean/max piston speed is high but due to material quality improvements acceptable since it does not run much in that region.
I'm more concerned at max acceleration overstraining rod bolts messing up the clearance & deforming the rod bore, shearing stresses on the small end for both rod and piston pin.
No body wants 100k km life from them. Will be great but....
2.5 bar is not that high. Paavola drives with 4 bar boost.
Yes, that's right. 5 bar absolute.
That's why I told more than 2.5.
2.8 - 3..... will be good. I believe don't need so much like 4..... Which is crazy.
I know about garrett special made gt 42 with four bearings, capable to make a little more than 6 bars boost...
Mean/max piston speed is high but due to material quality improvements acceptable since it does not run much in that region.
I'm more concerned at max acceleration overstraining rod bolts messing up the clearance & deforming the rod bore, shearing stresses on the small end for both rod and piston pin.
Thats true....
Than how We can run for example GT4202 - need displacement or high RPM. Which is better? Ive seen many projects with booth done it + high boost (more than 2.5 bars)....
Thats true....
Than how We can run for example GT4202 - need displacement or high RPM. Which is better? Ive seen many projects with booth done it + high boost (more than 2.5 bars)....
Who did Dutter's head? TK motorsport? I can't believe a stroker will flow that much at those high rpm's, so no need to go there.
Inertia on strokers does not seem an issue then these days?
i have to agree with Repo, the hydro lifter is done at ~8500
Agree with that - for me 8500 are high. And Yes - from 7500 to 8500 You can use stronger springs with hydro lifters but that is.
Up than 9000rpm is extreme even with mechanical lifters and they are strongly recommend!!!
But you cannot see very clealry. I the specs is stated 9200 rpm, but knowing what gearbox he uses, and diffs, you see that is hitting revlimiter around 400m http://www.youtube.com/watch?v=2z-iKhOu3FI -
around 265 kmh, that only give around 8500-8700 rpm, depending on tyres.
Does anyone have any footage or dyno plot from Dutter, again, I am not actually doubtful, but just there are so many myths of this type on the web.
I know Kalsket revs his 95.5 stroker 8k+, but I have not heard of 9000rpm revs with stroker. And like Vcosmin said, usually it does not really make any sense to rev that high.
Attached a plot of Paavola's 2.2 liter engine. Turbo is Holset HX60 mfs, 81mm compressor, 86mm turbine. You can see we need to rev over 9k.
At high rpm there is no problem wit filling the lifters with oil. The problem are the springs - they cant return the valves. That's why we put strongest one. And the valve seats - to do not burn, or/and make valves jump. That's why we use beryllium copper. For guides too. That's my opinion...
i have to agree with Repo, the hydro lifter is done at ~8500
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