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What is bore sizein bearing

The Radial BigShot i/o is an easy to use instrument selector that lets you quickly transition between any two instruments and send the output signal to your amp.

In the midst of upgrading an 4g63 evo VIII engine and to replace them with an aftermarket 2618 pistons (most probably it will be JE or CP). The block is still with it's stock bore and there's no issue with the block. Today, i measured the block and all bores measured around 85.02mm (bore 1/2) - 85.03mm (bore 3/4) (measured using a bore gauge zeroed at 85mm). Took 4 measurements (2 cross sections x 2 positions top and mid part).

Bearingborediameter calculation

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The other thing to remember is cylinder wall honing which is required for good piston rings breaking in. Normally it is additional 0.01 mm everywhere when done with torque plate.

Borediameter bearing meaning

The 4-Play is a multi-channel direct box that has been specifically developed for multi-instrumentalists to enable them to quickly change instruments on stage.

The PZ-DI is a high-performance specialized active direct box designed to accommodate acoustic and orchestral instruments, with a selectable input impedance that can accommodate magnetic pickups or piezo transducers, and a variable low-cut filter.

Borediameter measuring instruments

Bearingbore sizechart

Some might be wondering why not just overbore it to 85.5mm, well i just want to save up the meat in the block for long term upgrades say if the current setup failed then i can still go for 85.5, 86, 86.5, 87mm etc. This would allow me to keep on rebuilding the same block before forking out money to buy a new block.

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The HDI is a studio-quality direct box designed to create exceptional recordings with any instrument, utilizing premium Jensen transformers and a unique Color control that provides an entirely new yet familiar-sounding sonic palette to experiment with.

As Georg said, if the bores are in good enough condition, you should be fine, especially if running relativel low boost levels. My normal preference would be to re-bore, especially with forced induction, but I do understand your reasoning. If I may make a suggestion, some blocks are used in different engines and you may be able to pick up another, stock bore*, block cheap. This would mean if you did get oversized pistons you would have the option of later using them in the rebored spare block, also with correct clearances.

*Possible a 4G64 based long rod/stoker engine - https://www.maperformance.com/blogs/tech/4g63-engine-building-basics-101

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The ProDI is a passive direct box designed for use on stage or in home recording studios, with the ability to handle high output instruments without distortion, and a transformer-isolated output to eliminate noise from ground loops.

The PZ-Pre is a power-packed preamp that lets you switch between two acoustic instruments and feed the PA with a built-in Radial direct box. Piezo optimized for orchestral instruments.

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Borediameter formula

Just to clarify, clearances are NOT built into the bore, they're built into the pistons which will be very slighly smaller than the bores. That is, the bore would be 85.000mm but the pistons would be 84.900 to 84.975 depending on design, use, material, etc - however, even with modern manufacturering techniques, there are tolerances and this is why it's still good practice to size the bore to the piston going into it. However, that's with a fresh bore and your wear should make that un-needed.

Need advise if i should send to the machineshop to overbore it and use a 85.5mm pistons or can i just buy 85mm and bore them with the recommended clearance. JE recommended clearance for 85mm pistons at (0.0030 - 0.0035 inch) where i know the clearance in inch based on the above measurement is at 0.0008 inch - 0.0012 inch. In other words, i still have meat in the cylinder wall to make up for the clearance if i purchase the 85mm pistons.

Seems there may be quite a few options to check out for the engine blocks, might reward a few weekends going through the local engine dismantlers/wreckers/on-line trading sites - https://en.wikipedia.org/wiki/Mitsubishi_Sirius_engine

Cylinderbore sizechart

If you’re frustrated with the sound of your acoustic pickups, you’re not alone. Though there are really only three main types of pickups used on acoustic guitar, they all excel... Read More

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The most important things are proper geometry of the cylinder and proper piston to wall clearance. If you can maintain both those parameters and keep the piston size 85 mm there should be no problem with that approach...

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