I5 extreme! spoke with jonus about my engine, and general discuss

[helvetesmaskinen]

Purpose is to discuss topic and share information that I got from Jonus.

I was looking for high rpm, and as much displacement as possible and taking rod ratio to account.

Jonus informed now that 9000rpm with 95.5mm crank in 236mm block is not a problem with dry sump. This gives 28.7m/s pistonspeed and rod ratio of 1.66 which is poor for a turbocharged motor that rev 9000rpm. Some serious numbers...

He has experience like hell and using this setup in his own machines without cylinderwear/eating pistonrings for quite long. Also the head must flow to these high pistonspeeds.

I was in to use the 92.8mm crank instead, but he advice me to not go that way. With 92.8mm I got a good 1.73 rod ratio with 160mm rods and loose only ~50cc. Turbocharged engines with hi rpm always uses good rod ratio for a reason I feel.

Feels a bit confusing to decide now, but sure he now what he's talking about. It's amazing how these engines holds... What is your 50 cents?

[donce]

not so many people know this stuff if speaking about 9k rpm, not to mention the Diesel crank! at such high rpm. you could also ask Repo and then make your decision

[cooperquattro]

What was the point in asking if don't follow his advise??

[will20v]

Jonus has been there and done it take his advice.

[|CL|NIKI]

I will go same way this spring. Will use diesel block, diesel crank, H beam rods 158 or 159mm. + 83mm pistons and 4th stage dry sump pump.
Some time ago I asked here in the forum, and it became clear that 9000 RPM are no problem even with original oil pump, but with CrMo wheel.
But I will go to a dry sump and mechanical lifter + at list 1mm oversized valves and fuly headwork/port.

[my2000apb]

Jonus has been there and done it take his advice.

agreed

[terrybullwon]

I remember being told this once by

How fast can you afford to go?

Take this in mind and then get a blank bit of paper and start a fresh

[Acidburn]

I remember being told this once by



Take this in mind and then get a blank bit of paper and start a fresh

And whatever your budget, take that and either double or at least triple it.

[terrybullwon]

And whatever your budget, take that and either double or at least triple it.

What he said

[JP]

I'm running 236block 95.5 crank lightened to weight of 86.4crank. Rod ratio of 1.66 and rev to 8000+rpm on stock oil pump. If I went dry sump I quite happily take that to 9500 peak 9000 continuous.

At a push I'd say 10,000 but the head wont shift the correct airflow to support it on a turbocharged stroker without enlarging valves. Whereas in an ideal world at that rpm you want to keep stock valve size or even smaller to help lighten the valvetrain for high rpm.

Hth

[my2000apb]

all this high rpm talk makes my hydro lifters tireds

[|CL|NIKI]

I'm running 236block 95.5 crank lightened to weight of 86.4crank. Rod ratio of 1.66 and rev to 8000+rpm on stock oil pump. If I went dry sump I quite happily take that to 9500 peak 9000 continuous.

At a push I'd say 10,000 but the head wont shift the correct airflow to support it on a turbocharged stroker without enlarging valves. Whereas in an ideal world at that rpm you want to keep stock valve size or even smaller to help lighten the valvetrain for high rpm.

Hth

There is a 5.5mm stem intake valves mate .

[|CL|NIKI]

all this high rpm talk makes my hydro lifters tireds

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...

[repo]

Hydraulic lifters collapse somewhere above 8500RPM, even when modified solid.

Did Jonus tell why not to use 92.8 stroke?

We have done 10 000rpm, but only with 86.4mm.

All of who have not tried +9000rpm revs, I assure You, it is not as simple as changing rev limiter, especially if You have setup that flows and turbo that keeps pushing full boost at those revs.

I am not saying I doubt +9000rpm with stroker, but I would love to see some evidence. Stroker + proper flow and proper boost at 9000rpm should be outrageously powerful. Mind we got almost 1200hp on dyno and +1300hp on track from 2.2 liter and 9600rpm.

[|CL|NIKI]

With Gtx 42 or bigger?
Are only 86,4 can we rev to at list 9000rpm? What about 95,5 or 100mm?