BMW M20 Stroker Conversion | Rebore from 80-85mm | Replacing Core Plugs |

#enginebuilder #enginepower #restoration #enginebuilding #enginereconditioning #bmw #engine
Hi everyone, welcome back to our channel.
In this video I am machining a BMW M20 bottom end which includes….reboring the block from 80mm - 85mm. Gapping Piston rings to suit application. Removing core plugs.
I could do with your opinions on a small project for myself.
Hope you enjoy.
James.
www.youtube.co...

[@spurs079]

Best engineering channel. Please keep the great videos coming

[@graceenginedevelopments]

Thank you, will do

[@davestephens6582]

Hi Gauge is for checking if bearing journals are oversize as the gauge is tapered if it goes to flange it is worn oversize they were supplied by vandervel bearing

[@graceenginedevelopments]

Thanks Dave.. spot on

[@e36s50b30]

Very interesting content, as boring B20s was always considered a no no.

[@graceenginedevelopments]

Thank you

[@paulcrehan9523]

Nice work on the BMW block, I was surprised with how much meat was still there after taking it out to size, great video again, love the vintage tooling, I’d clean it up and see how it looks then make a decision as you mentioned it was flaking, either way it would look cool, be nice for everyone to see it as long as it doesn’t get messed with eh

[@graceenginedevelopments]

Yeah I was surprised as well.. the customer has sent some videos of it on the rolling road, I'll post the soon.. sounds mega.. yeah I'm going to restore it nice I think

[@tw0million]

awesome video. e30 owners thank you

[@g0fvt]

If those dowels on the block face are hollow if you fill them and the gap underneath with grease you might be able to tap them out hydraulically. It certainly worked for me in getting a B series spigot bearing out. Just put the crank on end, filled the bushing with grease and tapped a snug fitting drift into it. Apologies if this is old info.

[@graceenginedevelopments]

I've done spigot bearings like that but never tried dowells.. I will try it next time. Be

[@jimjam1934]

They're available from BMW brand new for peanuts, just buy new!

[@graceenginedevelopments]

I will next time

[@g0fvt]

The Hepolite machine would be nice cleaned up, if you refurb it totally it may not be quite so cool and original.

[@graceenginedevelopments]

I agree.. I'll wash it first then see what's left

[@robbending3848]

With the old Hepolite gauge I'd certainly start with a good clean to see how much grime is embedded. If it won't tidy up, then consider a careful recoat. I'm sure there's some trick machine finish you could apply to the measuring surface to really make it sing. I'd put it in one of yr glass cabinets in the shop - you'll get visitors asking you to demo it. As for that Vandervell gauge - well I can only guess. They made bearings, so I reckon with those Ford markings it would have been used to gauge main or big end bearing dimensions of particular engines - whether they needed oversize bearings or machineing. Am I even close?!

[@graceenginedevelopments]

Hi Rob, yes a good clean is first.. I like original look but would also like it immaculate.. you are virtually bang on with the gauge but I will show it off in the next video.

[@godfreysautomotiveservices]

Tough decision with the Hepolite machine, I’d probably opt for restoring it but would look great either way. If you opt for cleaning it all up we have a vapour blaster if you ever need anything cleaning up 👍

[@graceenginedevelopments]

Thanks mate.. if I decide to restore not just clean up I will definitely send it up to you.. whats the rough cost

[@godfreysautomotiveservices]

@@graceenginedevelopments look forward to the end product either way 👍 be no cost on that job for you mate

[@graceenginedevelopments]

Oh awesome thanks mate.. I don't mind paying though..

[@snhongo1]

Great video , very much appreciated ,,,,,

[@graceenginedevelopments]

You're welcome

[@stevessheduk6623]

I would put the Hepolite machine in the board room/office. You seem quite attached to it and if its on the counter chances are it will get broken. I would restore it and you can watch it patina in your ownership and pass it on......just a thought. 👌🏻

[@graceenginedevelopments]

It's definitely cool . Yeah I think I'm keeping it in the office mate.. just completely unsure about restoration

[@Rovinman]

You could give the Hepolite piston measurer to me to go with my Hepolite pistons in my 1960 Rover P4, 6 Cylinder, I.O.E 2625cc. Massive 104 BHP ! which I've owned for the last 49 years ! I hope you can still get the Hepolite Pistons, otherwise I'm stuffed ! Other than that Leave the Patina ! Just clean and polish it, with a soft cloth ! Take care James ! Just found your site and have been Binge watching it !

[@graceenginedevelopments]

Unfortunately I just can't get rid of it.. if you need help sourcing a piston let me know. Thanks for viewing

[@Rovinman]

@@graceenginedevelopments , The car came over to Thailand, with me when I came here 25 years ago ! And the care, doesn't like the current 40 Degree C temps ! Take care ! Stu

[@graceenginedevelopments]

That's pretty cool to have that over there.. good luck with it.. if you need anything from over here let me know

[@Rovinman]

@@graceenginedevelopments Thank you Very Much ! I will !

[@johnhayles16]

Would be nice restored and put on Display on the counter for everybody to see

[@graceenginedevelopments]

Yeah I agree.. I would like for people to see it

[@FingerBoardSnap]

when installing the snaprings for the pistons, arent you supposed to use the indent on the piston to leverage a pick or small flat head like tool to pop the ring in? I always thought this was that indents purpose

[@graceenginedevelopments]

Hi Alec. Yes that's what we used but access was tight and tricky.. a couple of them just went in by fingers.

[@bmwmaster81]

IM wondering that there is enough meat t bore to 85mm, I woud duble check how much thickness is left of the cylinder walls. There is a possibility that the cylinders will bend and become a wider shape, thats why I didnt try to bore the 80mm block to 84mm. But you did 85mm!

[@graceenginedevelopments]

I was worried about it too.. but the customer said it's a done mod and to carry on.. it still had a fair bit of cast there.. I can't remember of the top of my head what the measurement was.

[@munichicons8534]

Cylinder walls on M20 are typically 5,5-6 mm.

[@KneipeMeijer]

@@munichicons8534 But is that for all or is it different for 80mm and 84mm?

[@bempowered138]

325i/ 525i and 325e/ 525e/ Alpina and Hartge 2.7 M20s are 84mm bore from factory. People got to 85.5mm bore on these. The 80mm from factory is for 320i/520i and 323i M20 engines

[@bmwmaster81]

In general although it can be done, it is risky because of casting shift and error. I did from 84mm to 86mm easy. But from 80mm to 84mm could lead to cracks or cylinder bore deformation. The 320 blocks have different casting, no cooling bored etc.

[@ecuperformance3320]

Hi I want to ask regards rebore bmw m54 block from 84mm to 85mm do you torque the deck or not need it?

[@graceenginedevelopments]

Hi, we would recommend a torque plate, but we don't have one for that engine.

[@pbysome]

Subi performance taps a thread in them and slides them off.

[@graceenginedevelopments]

Cool

[@zeanopietersen8914]

What's the company's name that supplied the pistons?

[@graceenginedevelopments]

I think the kit came from Ireland engineering

[@hyphensclassics]

Ah the struggle of how much to restore something. I agree with you, but there is no point restoring something to brand new in my book. Yes the mechanics can and should be, but the look has to be retained. Well that is my view. Where to put it depends on how precious it is to you.

[@graceenginedevelopments]

Yeah I think your right.. I do think it's special so may put it in the training room

[@andresavilez5836]

hellow my friend, venezuela

[@graceenginedevelopments]

Hello Andres. How are you?

[@dolphin8219]

How many is the new stroke?

[@graceenginedevelopments]

I could find out for you.. the customer assembled the engine himself

[@berkshirebodyshop6031]

Just get it working and leave it as is put in shop for people to see

[@graceenginedevelopments]

Yeah I think the used look is cool

[@mrnick8171]

Supereta

[@graceenginedevelopments]

Thank you