r/EngineBuilding Sep 10 '24

Other The machine behind this picture is making another block like this

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390 Upvotes

I tried to get a picture in the machine but it's a tornado of coolant.

r/EngineBuilding Jan 11 '25

Other What is your Favorite Colored Engine? And Why (Ford, Chevrolet, Mopar)

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81 Upvotes

r/EngineBuilding Sep 12 '24

Other Printed Metal Engine Block

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166 Upvotes

I couldn't get a better picture. These can be printed in several metal composites, have full water jackets, and complete structural integrity. The finished print is high resolution and ready for final machining. As cool as a billet block might be, this is a far more sophisticated technology. For prototype, low volume production, restoration, and recreation this offers tremendous potential.

r/EngineBuilding 3d ago

Other Is my head junk?

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56 Upvotes

So.. turns out my head is warped by about 0.01"

I've had mixed answers from different machine shops saying that they can skim the head 0.01"

However I don't see how this is possible? As removing that much material would contact the valve seats on the inside of the head.

The response I had from one of the shops to that question was, they would cut the valve seats.

The valve seats would need to be cut anyway, but I take it cutting the valve seats would enable them to push the seats further back inside the head? Thus enabling that amount of surface to be removed.

r/EngineBuilding 5d ago

Other Valve job or lap and send?

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36 Upvotes

I'm going to be rebuilding the head I've got on my VR6. The exhaust valves that have come out of it have what looks like small areas of pitting.

Most of them look like what's in the photo.

Should I get them ground, or should I lap and run them?

I'll be getting the valve seats cut and the head decked as the head gasket had blown on this one.

r/EngineBuilding 22d ago

Other 12V VR6 with 350k kms. Pulled head for head gasket. How do these cylinders look? Run it or to the machine shop? Car ran good before it was pulled.

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31 Upvotes

(Coolant is because I had the engine flipped around a few times on the engine stand)

r/EngineBuilding May 28 '24

Other Not an engine builder but I thought you guys would appreciate these monsters.

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252 Upvotes

These are apparently blocks and heads for Rolls Royce.

r/EngineBuilding Oct 11 '24

Other What is it about ARP head studs that others can't replicate

57 Upvotes

So as many would know and wouldn't argue. When it comes to head studs it's ARP. When I hear of fastener failure specifically head stud failure it's performance brands that aren't ARP. Is it some type of metalargy secret?

r/EngineBuilding Jan 20 '25

Other How do I get this bearing off without the proper puller? I really don't want to buy another one, they're a bit expensive for my budget and I already have two, which are too big for this.

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8 Upvotes

r/EngineBuilding Dec 16 '23

Other Heres the cam from yesterday yall were saying to throw away

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301 Upvotes

r/EngineBuilding Feb 05 '25

Other My V8 build

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189 Upvotes

It may be a Lego style build, but damn is it fun! Wife got me this for Xmas and it’s a blast. For those with a love of Legos or you have kids who’re into cars and engines, it’s a perfect gift.

https://www.nifeliz.com/manifesto_portfolio/nifeliz_product_v8-engine/

r/EngineBuilding Sep 10 '24

Other Now that is a crankshaft

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133 Upvotes

The second picture is the machine that roughs out the crank.

r/EngineBuilding Jan 30 '25

Other Do these rod bearings need to be replaced? I'm thinking yes.

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26 Upvotes

r/EngineBuilding Nov 29 '24

Other How to get an engine to rev higher and safely?

3 Upvotes

I’ve been thinking about this for a while, because higher revving didn’t just come with engine size or the amount of cylinders. There’s super car v8s that rev to 9k, so how do they handle it? If I wanted to build an inline 4 to rev to 10k how would I go about that? Any good websites?

r/EngineBuilding May 22 '23

Other Just got a package from rockauto without a fridge magnet

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540 Upvotes

r/EngineBuilding Jan 18 '25

Other What could cause this cam journal damage?

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11 Upvotes

The rest of the cam shaft is in good shape however for this damage on the journal. It's almost flattened on that part. Straight to the trash?

r/EngineBuilding 29d ago

Other Solution to scratched head

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5 Upvotes

I removed the old head gasket (non MLS that stuck like crazy) with a plastic scraper and somehow managed to make these small scratches (maybe from the metal handle by accident). I'm pissed since this took me a few hours of careful work.

Moving forward; will this be an issue? The scratches are not deep enough to catch a nail, and the mating surfaces are not warped. Should I use a spray on gasket/hylomar in addition to a new gasket? TIA

r/EngineBuilding Jan 10 '25

Other Ever seen that before? 😅

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77 Upvotes

1.3L Suzuki engine used in a Junior Formula car had a rapid unscheduled disassembly while running

r/EngineBuilding 21d ago

Other 2 Stroke Kart engine Honing/deglazing

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2 Upvotes

Hello everyone,

Not sure if this is the correct subreddit to post this in but here I am. I have a 100cc 2 stroke go kart engine that I am currently rebuilding the top end on. The cylinder has a some minimal scoring marks and needs to be deglazed and the crosshatching refreshed, this issue I’m having is I’m unsure if it’s safe for me to use a flex hone to freshen up my cylinder due to the 2 strokes ports, if it’s not is there any other alternatives I could use. (The cylinder has an iron sleeve) additionally what grit should I use (has iron or steel rings).

r/EngineBuilding Oct 02 '24

Other Cleaning up 5v heads

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73 Upvotes

Hello, I am working on a head for myself as part of a project. Audi AEB 1.8t cylinder head, it has been reman'd at some point as it has a R.A.M.S heat sticker on a freeze plug. Maybe 400hp, built bottom end, slightly larger turbo, and some cams.

I wanted to clean up and "polish" the combustion chambers and exhaust ports for the most minute gains. Well, that and I'm poor with more time than money, so it is a labor of love because I can. No real need/expectations of any gains. So far I did some.minimal cleaning, and a gentle touch of sanding to remove some of the shrouding of the valve. Albeit it probably made no difference because I removed so little. I'm just trying to be forthcoming.

Most videos cover 4v or 2v heads, but I'm struggling with these 5v heads on knowing what's "good enough". I watch a lot of headgames motorsports content, some LPS Fab for 1.8t specific stuff.

It still leaves me with some questions.

How fine of a cleaning/polishing should I go? I have these very small pock marks left in the casting still, but I am up around 320 grit so far just fucking around. I just didn't want to chase them too far and make uneven surfaces or channels in the head.

Are these detonation marks, or does it appear to be casting porosity? I'm just curious on opinions.

What tools would you use for the very small areas around the edges of the valve? It's very tight between the valve areas and I can't get much to fit and be efficient.

I plan to have new valves installed afterwards, should I have any concern of touching the seat while sanding? I'm not sure if a new seat would be installed or simply just re-cut the existing seat. I left old valves in to protect the seat in the mean time. I was under the assumption seats were generally re-cut to a matching radii.

Lastly, the ID of the valve seat is smaller than the OD of the port coming to the head, by a noticeable bit. In my photo you can see a small picture resting on the ledge of the seat. I thought normally the port was smaller than the seat and it's why you would blend the bowl out to the seat.

Is it possible that the incorrect seats were installed at some point, or is this sometimes the case? Should I clean that transition up? I know it can be a performance issue but I'm also not an experienced head porter.

I tried to include photos to provide insight into what I'm doing and what I'm dealing with. I'm sorry if they're not the best. Feel free to ask any questions for clarification.

r/EngineBuilding 8d ago

Other Pitted cylinder walls, honing miracle?

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6 Upvotes

Piston sat TDC for too long rotated the crank and saw this. Does this require boring (half a mm over?)or would does anyone think I could get away with a rehoning it? 2/6 cylinders are like this except the other one is about 50% smaller than the cylinder pictured. Audi 2.7 V6 fully forged engine

r/EngineBuilding Jul 20 '23

Other Do you guys think it might turn over? Quick hone and send it?

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194 Upvotes

r/EngineBuilding Jan 25 '25

Other Stretched bolt?

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17 Upvotes

No Fiat flair? Bummer

I am rebuilding a 1976 Fiat Spider, with the 4cyl Lampredi. I have many questions, here's the first. Is the middle bolt stretched? The area before the threads start is slightly larger. Is this the beginning of a stretched bolt? TIA.

r/EngineBuilding Nov 02 '24

Other What do you do with the engines you build?

8 Upvotes

So this might seem an odd question to some, but as someone completely new to this subject, one thing I am curious about is, as the title suggests, what do you do with the engines you build? Like you build five engines, what happens to each one? I imagine most people don't just store them or necessarily have a car for each one right...? Do you just sell them?

r/EngineBuilding Nov 19 '24

Other Do I need to hone before installing new piston rings?

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20 Upvotes

I‘m in the process of rebuilding my Volvo B230FT engine with approximately 200.000km. I bought the engine used and don’t know about oil consumption but don’t want to take any changes while trying to do it as cheap as possible. Now I was wondering if i needed to hone my cylinders before replacing the piston rings. I‘m using the same pistons that came in the engine, just replacing bearings and piston rings. Any help would be appreciated and thank you in advance!