My sleeper

[hammer]

+0.5 in and outside and from 11mm to 13mm thick

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[Thuppu]

How much bigger can you go?

[hammer]

Start to make new gears for a bigger oil pump

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[hammer]

Think about my engine. Talk with the tuner from the dyno and came to the result that the clearance from my crankshaft is to small. So i will take them out and let it girnd to 0.1mm Main- and 0.07mm rod bearings clearance.

[hammer]

I found this helpful regarding clearances etc.

http://theprojectpad.com/viewtopic.php?f=32&t=1370

Thanks for the link.

[diesel des]

You can get special plugs that have inbuilt pressure sensors. V expensive.

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[hammer]

Thanks for the Info.
I think BMW use the spark plugs to measure the Zylinder pressure. After ignition the look how many ampere they need to get a new spark. So they now the pressure

[PRY4SNO]

I believe Jeff can make these in 95.5 as well.

http://fourringperformance.com/crankshaft.php

[diesel des]

So you mean with lower octane fuel(pump) it would be easier to know where that ceiling is and back off timing from there. I think I follow what you mean...

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Yes pump fuel is easy as you will get to detonation very early. Because you can run say 10 deg more timing doesn't mean you should. I run on Lpg gas which is high octane and it's almost impossible to get it to ping. But to be safe I stay close to pump timing.

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[mushasho!]

Minimum best torque settings don't work well on very high octane fuels. You can have slightly more torque with more advance but the cylinder pressures are way too high.

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So you mean with lower octane fuel(pump) it would be easier to know where that ceiling is and back off timing from there. I think I follow what you mean...

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[diesel des]

Yes. There are circumstances with uncontrolled combustion were torque can increase slightly but pressures go through the roof. It's not full detonation but if say the spark lights the fuel and 90% burns normally. 10% of the remaining charge then has been heated up and burns in one big bang. This fast combusion will give good torque but a big pressure spike.

Ideally a cylinder pressure sensor is used to look for spikes but theses are expensive.

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[hammer]

That is exactly what I mean. But how much does it fall? If it's only a slight amount of torque reduction than your perhaps still too advanced. You want to reduce timing until torque falls of sharply than advance slightly again.

Minimum best torque settings don't work well on very high octane fuels. You can have slightly more torque with more advance but the cylinder pressures are way too high.

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But can there be a detonation and highest torque at the same time?

[diesel des]

Yes if i reduces 2° torque is falling. But maybe this is the Problem. Better i go 2° back up to 5500rmp

That is exactly what I mean. But how much does it fall? If it's only a slight amount of torque reduction than your perhaps still too advanced. You want to reduce timing until torque falls of sharply than advance slightly again.

Minimum best torque settings don't work well on very high octane fuels. You can have slightly more torque with more advance but the cylinder pressures are way too high.

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[Majorcina]

I just read the whole threat.Great project mate!Hope you find your problem soon

[hammer]

Yes if i reduces 2° torque is falling. But maybe this is the Problem. Better i go 2° back up to 5500rmp