How to select the Correct Piston Bore Size for your Engine Build - Real Street Performance

[@AmrinderSingh-zx9hr]

I am running a garrage with the name of PUNJAB RACING STORE in INDIA where I modify & tune bikes for RACING. This is very knowledgeable video. This guy explained thoroughly. I really Appreciate..!!! Regards...!!!!

[@yeahwerepthesamesmartech7113]

lol its guys like these that make rebuild go so smooth thanks bud

[@homeslice2487]

Love how specific his knowledge is. Great stuff.👍🏻

[@charlessmith7780]

Thanks 😊 you made me feel good on my 30 over piston deal ,I can't wait for my next set of goodies for my motor 😀

[@22AMOPRO]

all these piston videos this is the only one that explained everything I needed to know for my lt1. thank you

[@mikeward2980]

You made my rebuilding a little easier. Thanks for sharing your experience

[@debonairecatalina6570]

I have a late Pontiac 389, I'll be more than fine with cylinder wall thickness at .40 overbore, but I'll play it safe, flat top pistons for the 400s aren't as common due to their heads having "open chambers" rather than closed. On a side note, I hope whoever else watched the video and found this info might helpful like I have

[@CarsnStuff]

I prefer going with metric. With my 2jz the stock bore size is 86mm i bought 86.5mm pistons for my block so everything is fresh in the cyl walls and its a new surface for new pistons. just makes sense. Real Street really helped me, good people over there.

[@tylercotugno8387]

Is .5mm a good clearance, I am about to order a 53.94 but my cylinder bore is 54.5. Would those sizes be alright.

[@CarsnStuff]

@@tylercotugno8387 that would mean you've have to take it to the machine shop so they can match the bore to those new pistons. It's actually a good thing because then it will be a new surface for the rings incase you potentially had cyl damage.

[@tylercotugno8387]

@@CarsnStuff I haven’t bought anything yet I just see engraving on the cylinder saying 54.5 then on websites to buy my dirt bikes stock pistons they are 53.96. This is the first ever rebuild on it and the cylinder is in good condition.

[@CarsnStuff]

@@tylercotugno8387 ahh okay.. that sort of sounds like how dirt bike companies will list a slightly higher CC engine than what it actually is. like on my crf 450 they list it as a 450cc bike. but the true cc is like 449

[@tylercotugno8387]

@@CarsnStuff ohhh ok makes sense

[@eschrader]

Applies for dirt bikes too. Thanks for the tips. Sent mine to LA Sleeve.

[@mzuk7421]

I love these videos. They are packed full of great info. Thanks guys!

[@jdmjayb16]

Good job real street I was just about to say I've always gone to c.w pence they have been my only go to machine shop an are the best!

[@drewfleming7065]

Would have liked to hear about different piston material, cast, forged ect and their clearances

[@jevan027]

Clear and concise, im digging RSP right now

[@SALTYDATTO]

Another reason why I'm choosing you guys for my build. Thanks for the video. Even though I'm a little late to the party haha.

[@maxsanchez4256]

Thanks for the info and advice, I'm rebuilding a honda elite ch80 '86

[@hassanbukhari8151]

Great video. Thanks

[@williamirizarry1113]

Thank you, very informative.

[@gregoryjd6583]

Thank you!

[@olddanb1]

Nice video. But you forgot to show . . . . . . "How to select the Correct Piston Bore Size for your Engine Build".

[@ScaleCarModels]

Informative video KUTGW!

[@salvatorehayes2753]

So Piston To Wall Clearance Is Simply (Bore Size) - (Piston Diameter At Specified Location). So If They Want .004" Clearance They Want The Bore To Be .004" Larger Then Piston, Not .008" Larger? Correct?

[@claytonmarsh]

Correct, use diameters, not radius

[@skibdosh]

This gus looks like my dog bridy 😧❤️

[@joejoeready]

im about to rebuild a 350 for a 95 tahoe. all i want is god MPG if i can...so 60 over isnt what i need correct? i was told to go big for power. all comments are appreciated

[@dangerousfreedom4965]

mista ready you only want to boar it as much as necessary to bring the cylinders back to perfect.

[@joejoeready]

@@dangerousfreedom4965 thanks for that...im taking motor in tomorrow. so ill let them decide

[@debonairecatalina6570]

Aim for high compression and small valves, run the best oil you can get and as far as gas goes, running non-ethanol alone will grant a 4% increase in overall fuel economy

[@melekk0]

hey please i have a question on bloc engine its marked the bore cylinder class , for example "abac" can i use piston classe "B 71.98" if the cylinder classe "a 72.00" is worn but still in the limit of classe b lets say 72.02" ? the mix is possible ? cause the workshop says that if classe "a" exced the limit , rebore the cylinder 0.1 and use oversize 0.1 piston Cylinder "A" 72,00-72.01 /// Piston "A" 71,965-71,97 Cylinder "B" 72.01-72.02 /// Piston "B" 71,97-71,98 Cylinder "C" 72.02-72.03 /// Piston "C" 71,98-71,99 over size cylinder "A" 72.10-72.11 /// over size piston "A" 72,065-72,07 over size cylinder "B" 72.11-72.12 /// over size piston "B" 72,07-72,08 over size cylinder "C" 72.12-72.13 /// over size piston "C" 72,08-72,09

[@Nelval573]

My piston has 0.75 stamped on top is this for the rings or I also checked the old rings with filler gage says .010

[@isjesse1]

Say i have a h22 with a 87mm bore, and say i get it bored out to 88mm do i buy pistons size 88mm or do i buy a 87mm piston with a 1mm ring. im over thinking whether or not the ring are included in the measurement of the piston. first build if you couldnt tell lol

[@herbertmoore8125]

What do you normally charge,for that type of service?

[@ilyasbuyuklu1587]

I will rebuild my 2.0tfsi engine..i get bartek forged piston..they have 83mm bore but original pistons are 82.5mm is it fine to get 0.5mm larger piston ? Does it mean increase engine ? And does it mean they shape piston walls to be smooth ?

[@tylercotugno8387]

Could I just go to a website and put my make model and year and then get that piston stock without measuring

[@realstreetperformance]

Hey Tyler, nobody could answer that unless they took your engine apart and measured the cylinder bore. If the cylinder bore inside your engine is damaged, our has become "out of round" over time or has changed in size over time, then it will affect your piston to wall clearance with a standard bore piston. The right way to do it is to have the block disassembled and inspected by a machine shop. They will tell you if your cylinder walls are in good enough shape to use a standard bore piston or if your block should be bored over and use an over sized piston. The most common mistake we see people make is to skip this step while trying to save money, and just buying a standard bore piston with hopes that their block wont require machining when it makes it to the machine shop. It almost always does require machining, and they almost always do have to exchange the standard bore pistons they bought for oversized ones. And depending on how long its been, there is sometimes a restocking fee which nobody likes. So the right way to do things is have the block inspected and measured before buying pistons. but lots of people still choose to do it the wrong way even though they know its not the right way.

[@tylercotugno8387]

@@realstreetperformance ok thank you so much I will take your advice and look around for what to do.

[@rashidmehmood481]

good

[@spacee3249]

This does not tell me how to set know person to wall clearance in a custom engine

[@jregamey]

I have a e22 clone. 97ml 100 cc?? It has a 56mm bore. To big?

[@lessolqu]

Hello. How can i know how much can i bore a 2.0 engine, im about to start a project but where i can figure it out, thanks

[@mjmbelemakgala759]

My piston is written 50 which rings size I should fit?

[@djl7940]

I'm having a problem with my rebuild 2006 5.7 Hemi from a dodge charger the engine block was completely trashed from a piston that cut loose so we ordered a block that was bord over 20 over so we ordered pistons and rings 20 over I must of pulled this engine apart 5-6 times do to oil blow by I dont understand the ring gaps are on point and made sure the rings where spaced 90 degrees and away from the oil drops on the pistons it's been a nightmare for me out of all the engines I ever touched this 5.7 hemi is fare worst I followed every step on measurements and torqued everything to spec lost so much money on this build this engine is running fine no codes, not over heating but oil coming out the tail pipe if anyone knows about engines please slide me some advice I used heavier weight oil for assembly of parts and running mobile 1 5w20 full synthetic any of my fellow gear heads please give me a understanding what I did wrong

[@psiturbo]

did you do a compression check, vacuum? It can be valve seals

[@djl7940]

Figure it out the oil rings was junk, swapped out the oil rings on each piston, did my measurements, compression test each cylinder everything is on point. Thank you for answering me back!

[@manubinsia1101]

can someone tell me if im bore my block to 81.5mm/81.25mm how did i choose this forge piston???

[@rolflarsson9884]

SO what piston clearance should you have????????????????????????????????????

[@blueonblueracingnova]

Rolf Larsson its just said if its a n/a you can run a small clearance if its nitrous or boost you run bigger clearance to allow for heat expansion . Also depends if pistons are forged or not as different pistons expand at different rates all depends on each individual build realy .

[@mrrberger]

Tommy if you need to bore 40thou over to "clean up" the engine it's junk as every other consumable surface will need machining, the cost is large. If you advise minimum over bores simply to save the block for future resizes your kidding. Most cars well maintained last a lot of miles and most cars with a rebuilt engine won't out last the rebuilt engine. Are you just trying to sell product?

[@mutlah]

Piston manufacturer will have spec. Also, your engine overhaul manual will have min and max clearances for a standard build. Your machinist will need to know what pistons you will use. Don't buy any parts until speaking with machine shop about your engine size after machining. Some piston manufacturers only make certain sizes.

[@adibz959]

72.5mm is my original piston size. Can i use 73mm aftermarket piston?

[@realstreetperformance]

If your standard bore is 72.5mm, you would need to have your block machined to 73mm to use a 73mm piston.

[@adibz959]

@@realstreetperformance Thanks! Im surprise you reply to my comment. Thank you 👍🏻

[@realstreetperformance]

@@adibz959 Thanks for watching, and commenting!

[@JAVTROOPER]

@@realstreetperformance thank you for replying him. It means alot to me. Not just me but everybody here who read it. Thanks boss 👍🏻

[@jonowannous6893]

Might be an odd question but what does 'Thou over' mean?

[@realstreetperformance]

"a thou over" means "one thousandth of an inch (0.001") larger"

[@Jase2114]

So if I was going to bore my b18 out to 83mm and then sleeved it with darton mid sleeves what size positions would I use?? Would I use 83mm pistions

[@realstreetperformance]

Jason, you would have the block sleeved, and then bore the sleeves to whatever bore size you want. They come as 81mm but you can bore them to 83mm if you want.

[@Jase2114]

@@realstreetperformance ok so would I need 83mm pistons then

[@realstreetperformance]

@@Jase2114 If you bore the sleeves to 83mm you would need 83mm pistons. If you bore the sleeves to 82mm you would need 82mm pistons, if you bore the sleeves to 84mm you would need 84mm pistons. The pistons and the sleeve bore will match, whatever it is

[@Jase2114]

@@realstreetperformance thank you for this inward being told a whole lot of BS by another company then over here on the uk ..next year in February or March I will be placing an order with you guys on a few bits ...

[@rambow70]

Every time he said "thou" I could of swore I was watching a rap video, good stuff to know though!

[@nattsojaqs9822]

rambow70 The word "thou" has been around way before rap vids. It stands for thousandths of an inch. We're Talking hair strands, at that point.

[@4erdf]

ha, the machine shop matching the bores to specific pistons, bullshit.

[@blueonblueracingnova]

4erdf any good machine shop should have your pistons when they rebore and the biggest piston goes in the biggest cylinder and the smallest in the smallest cylinder . Every piston is a slightly different size and likewise so are the bores . Whats bullshit about that

[@mrrberger]

As the guy at the machine shop who does the bore and hone, you get what you pay for. You want piston matching fine but you better ask for it. I wouldn't bother matching with a std rebuild if the Pistons are that far out I send the back. if I Stress plate, high performance building then you pay and you get matching and more. You can also consider changing from cast to forged and bore sizing (+3-5thou) without an official "over bore", however this is normally only done for rare blocks as the industry doesn't see the need much. To save part cost you can also swell the Pistons and re-ring for a +5 but that's at the budget end.

[@brianpreston8030]

Have an 02 mustang v6. Wanna bore it out. What's the max. Wanna put new pistols whole nine yards plus turbo charger on it.

[@Jonny-le9sl]

Brian Preston get a v8

[@P71ScrewHead]

get it done bro, Super 6 website has your v6 upgrades..

[@fernandohood5542]

In summary go to the machine shop.

[@thdmtr]

its john travolta lol

[@leeroympumelelo615]

Borejob