Cylinder Bore Honing - Engine Building Video - Hone Piston Wall

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Basic Engine Building DVD - Chapter 28: Honing

And finally we come to the main part of the machine shops job, honing the cylinder walls. It will do two things. First it will bring the cylinder walls to the matching diameter of the new pistons. Second it will leave a cross hatch pattern of light scratches, to keep oil on the walls and prevent metal on metal scraping. A dial bore gauge is used to bring it to the exact spec needed within 1/10,000th of an inch.

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Category:

Autos & Vehicles

Tags:

• racing
• engine
• rebuilding
• machine
• shop
• motor
• power
• cylinder
• bore
• honing
• V8
• V6
• torque
• specs
• firing
• order
• dvd
• video

[ericg83z]

i have and 355 with about 40kms on it can i just hone the bores and reuse the pistons and rings?

[BoxWrench]

@ericg83z this clip is only a sample from the full length DVD where we advise you to pull apart the engine first and then do a visual and measurement inspection.

You'll need to see the condition of the piston skirts and the cylinder bore walls. Then you'll need to do the measurement (or have the machine shop do it for you) with a dial-bore gauge and micrometer on the pistons. It the pistons measure out ok, and the cylinder walls are within spec, you may be able to get away with just a hone...

[koopooda]

I watched these video's they are amazing. I am currently building my 350 sbc the pistons were chipped and I could see the rings from the cylinders. When I pulled them out there was not eve a ridge build up and it still had the cross hatch pattern. There are a couple scratches on the cylinder walls. Do you think it needs to be honed or bored?

[BoxWrench]

@koopooda Either yourself or someone at a machine shop should run a dial bore gauge into the cylinder and see what the measurements are for 'out-of-round' and 'taper' for the cylinder. if it's out of spec for either reading, you may want to bore the cylinders. On rare occasions, you can get away with only a hone, but not if there are significant hours and miles on the engine.

[mrrberger]

I use to run one of these, bluddy brilliant machine, you should put a torque plate on it while honing and see the difference. I would also suggest an experienced operator can vary the stone pressure during stroke with the top ring to take out barreling or flaring. PS any other honing technique is simply playing around this is serious stuff.

[BoxWrench]

@mrrberger This video is a clip from a 3 hour DVD focusing on a simple rebuild called 'Basic Engine Building'.

We didn't recommend the torque plate to the viewers for this 'basic' stock engine rebuild on the recommend of the machine shop.

They mentioned the accuracy gained for a stock engine rebuild was not beneficial compared to the expense of honing with the torque plate. For performance engine building however, we would absolutely recommend the use of a torque plate for the block honing.

[GUYANESEGT]

*drooling* car porn

[LittleModig]

This guy sure kick ass to al those Expertvillage bull shea....thanks dude your the king on ENGINES....

[CrikeyMang]

@ghettoflyer unfortunately not every machinist does this these days. But any good one will recommend it. OEs dont even do it.

[ghettoflyer]

Why is the technician not using a bore plate on the deck to stabilize the bores well machining? I thought that was common practice since the 60's or 70's?

[iLOVENATURE2011]

nice video...its good to know how the engines of our vehicles are fabricated... =)

[charlietow]

@morphine30roxy .030... say you have a 4.25" bore and you wanna punch it 60 out you now have a 4.31" bore... oh and it's thousandths, thousands is before the decimal. so in the about 4.31 the 4 is ones, the 3 is tenths, the 1 is hundredths. but when talking about boring engines, most people refer to the punch in thousandths, like, punch it .030 (30 thou) instead of saying punch it .03 (3 hundredths)

[techdavey1000]

Has anyone considered what the block is made of? If its the cheapest metal that will suffice you will be doing this a lot. In the good old days in England before everything became throw-away, decent blocks were made from special metal. I am thinking of the old Triumph 2 litre straight 6 blocks. These had the word "Chromalloy" cast into the block and the engines were renowned for outlasting the car. The worst makes used to need reboring every 40,000 miles.

[madisonelectronic]

I have overhauled small engines for years for friends (about 50) and my machine shop always wanted the piston (new or old) that was going in the block. I was impressed cause most small engines had generic tolerances. The tool and die owner quit to spend his millions. Great for him but anyone I talk to now does not want the new piston even on an over of 20 or 30 thsds on usually a really old engine. (like an old Clinton) Are these shops getting lazy or just don't care?

[Serostern]

@shadow0imposter The scooter already goes twice as fast than is legal, so I'll stick to the 50cc.

[shadow0imposter]

@Serostern depends if ur using an oem piston or if ur gettin an oversized piston

[Serostern]

I have a Honda 2stroke scooter with a completely smooth cylinder (and no piston). Should I get a new cylinder as I am getting a new piston?