KNURLING VALVE GUIDES: THE PROS AND CONS 

The ploughing a field analogy helped me understand this well. Thank you and good video.

More please. Even if we don’t do it we can choose a knowledgeable shop . Thx.

I learn alot about engine work from this man. You know they don't really teach this stuff in college because they don't have the time to tell you.

Knurling Knowledge 101 ! How about a video on how to achieve proper " installed valve spring height ".

Knurling valve guides? You gotta be kidding me, man! I guess there are two of us left in the world who do this! My sets have burnishers, not reamers for the final pass - I like 'em because you leave no raw edges - the burnisher just compresses the metal ridges left by the knurler to finished size, leaving a nice, smooth surface with a good oils spiral. Not all tools are created equal. Great video, especially stressing when to knurl and when to replace.

Excellent explanation! Minor nit, knurling "upsets" parent metal rather than "cutting" it which is why knurling doesn't generate chips.

Still love watching this video. I just realized why the speed reducer is necessary. Unlike a sharp tap which cuts threads and removes metal, the knurler is duller in order to mash through the hole and move metal instead of removing it. That must take some serious torque.

Very high quality video, tons of information, stayed on topic the entire time. Thumbs up from me.

I have never seen a knurled guide that shouldn't have been replaced instead of knurled. Very few people use guide knurlers right, and I think you may be the first I have actually seen. I have been using k-line bronze liners instead of knurling since it is fast and you usually cut enough out to have a straight guide again, and they are very forgiving in regards to valve material.

Would love to see another video about liners.

Glad to have you back! Always educational!👍

As always, thanks for sharing your knowledge!

This channel is outstanding.

Hey Danny, Great job on that definitely do more on the different valve guide options have a good one👍

Excellent content, awesome graphics, superior music .. Thank You Shop Mom.. yeah.. Danny was OK too😆

Sweet video! Thanks for taking the time to show us..

I didn't knew about this, but i'd get it with the drawings; i never seen that speed reducer thing on the garage that i'd worked on, but i've seen it on the construction.

Now they sell rebuilder valves. These valves are made with thicker valve stems for worn valve guides. and they come in different stem measurements.

Love your channel bro! If you need a 45 yr old apprentice give me a holla!!

More valve guide repairs please 🙏

Love you dude:) looking forward to book club:) the knowledge and confidence you have is amazing! See you in a week or two:) hi and hug's shopmom:)

Came upon this video great video😮

Danny: I love your work and advise. Please continue...

Great video

I have a customer that wants larger valves and seats installed on corvair 140 heads. The guides have .006 + wear and he said it will be fine go ahead a do it ive been doing this awhile. Ya i dont think so.

My personal cut limit for knurling is .0008 over desired finish size. Example 8mm LS hardened iron guide i finish at .0015 To .0018 so the maximum guide wear I will knurl is .0026 This number is also with in the GM published service limit. On a non-hardened guide application such as older GM and almost all replacement guides I just replace them. I don't feel a knurled and reamed non-hardened guide will provide the service life I want my product to go out the door with. As for lubrication when I knurl and ream a guide I store my knurls and reams for a specific size in a can filled with WD40. the keeps all the tools at a constant temperature as well as lubricated. I also use 8 reamers on v8 head one pass per reamer per guide as the reamer Gets hot with each pass. with heat the finish size changes.

Fantastic video, thank you Danny!

solid video very informative well put together 👍

Thanks for the video

Great job, thanks

Good info

Nice video! I'm working on a flathead. I am getting .060 oversize valves both I&E. I recently purchased a set of Sioux Tools to do this. My question is this: I don't seem to have the .850 Pilot Holder? Do I use the new removable valve guide instead of the Special pilot holder?

great info!

Should have mentioned proper clearance for a knurled guide. Informative

Got me... I did snicker a little :)

Orale Dan!👍

I have guides that are .2362 and the valves are .2342 What size Knurl tool would I use? The guides are straight. If you could help I would be thankful. Great Videos.

Mmmm... corded tools 🙌🏼

Nice!

Your videos are great, thanks for taking the time to make them. You mentioned doing a video on replacing the guides, that would be much appreciated, I have so many questions about that. I would like to replace a few guides in a 4 cylinder Honda head. I bought the replacement guides directly from Honda but the service manual doesn't cover all the technical details for replacing them. For example, the guide part numbers say they are oversized which I think refers to the OD (I haven't removed the originals yet to confirm that). I'm assuming there is a standard interference fit and they make the OD oversized so that can be achieved before installation. But what is that number? How oversized should the new guide OD be in relation to the aluminum hole it's being installed into? My other concern is once I install the new guide how likely is it that it'll be concentric to the original valve seat cut? A video covering this info or a comment reply would be very helpful, thanks again.

👍

Very cool! That Head was very interesting! What is it from??

Who or where do you buy the reamers or knurls from. Or a brand name.

Awesome. Pls tell me. If im doing 11/32 V8,s. What size nurl and what size ream do i use first. Mike.

I had heard of knurling valve guides but never new how it was done. Is there any performance advantage for knurling?

I have worn valve guides, which should maybe be replaced , going to measure them up and see. But the engine is a flathead 8 that is in the car and if I was to knurl the valve guides I would not be able to go all the way through. Is it possible to knurl all the way down and then back the knurler out, or is that an absolute no no?

Where can I find that drill speed reducer

HELP?!?! So after talking to others and finding the valve guides on my Packard are too brittle to successfully knurl I decided it would be best to replace them, but the first one is STUCK, I can't get it to budge. I did manage to get the top to break off. 😕 Have any tips or tricks for removing stuck valve guides?

it is the best procedure to have an engine burn oil past the valve guides, a worn out guide must be replaced or a liner installed.; on commercially knurled guides, there is a portion in the lower part of the guide that is not knurled to prevent massive oil consumption, it is not the case the way the knurling tool is used. I had a very bad experience with knurled guides...never again.

Again . Measure the clearance of the valve stem to valve guide. There are specifications. If you are working on junk do it your way. Lets see the finger exercise. Good for grandmas car not a racing engine or for a truck or boat.

You don't knurl the valve guides you cross-hatch hone the valves! Duh!