Camshaft Clearancing The STI Valve Buckets
ฝัง
- เผยแพร่เมื่อ 15 ต.ค. 2024
- With the help of some homemade tools and some math I was able to set my valve bucket clearances. This allowed me to get a perfect gap that match the factory specs.
#ModdingAddiction #BuiltNotBought #EngineRebuild
![[UNCUT]"ทนายตั้ม" แฉยับ! ความลับสวรรค์ ใครคือ "บิ๊กเทวดา" ของบอสพอล l คนดังนั่งเคลียร์ l 15 ต.ค. 67](http://i.ytimg.com/vi/ru9fpSaUwdA/mqdefault.jpg)
Thanks for the video;
10:55 the pattern looks off center; i would not use a rag under the bucket; it must rest directly on the drill press flat surface for a better chance of squareness.
I've done this but using a milling machine for more accuracy and using carbide blade to cut them down
That is probably the proper way to do it but on a budget you got to work with what you got. How did they turn out?
Very good idea, bench drill press! I will do following you. How about a mini one? Only 30 bucks.
I like the drill press technique. The only suggestion I have is that you probably want to use a hard/flat/clean surface with some lubricant instead of the microfiber towel. I can see the bucket rocking back and forth a bit when you're grinding on it and if you place the bucket on something like a piece of glass there'd be a little bit less room for error. I'm currently tipping my valves on a lathe using a tool-post grinder and was wondering if any people had ground the buckets.
I'm glad to hear it's holding up! How much power are you pushing?
Random question, did you get this idea from my video? I've had a guide up for a while by this method. I periodically get some know it all comments about how terrible this method is. I add them to the list of things I ignore.
The idea no I didn’t. I got it from a machining class in school but I did watch a couple videos on how people were going about it so probably. I know exactly what you mean. Just cuz it’s different than the way most people do things doesn’t make it wrong. The caliper has ends on it that are man made why can’t it be extended lol. Anyways thanks for the comment glad to see there is some supporters out there
Does it work good? I want to try it
I think you did good
Have you started car is it good?
How’s this been running no issues ?
No issues. Burns a little oil when it’s super cold but that’s cuz I gapped my rings bigger for a higher hp
To be expected I set mine to 28 thousandths I’m sure mine will burn something thanks for the reply
8:27 how do you know how much to remove, how did you get 0068?
I installed all of the smallest buckets that I had from both heads the reinstalled the cam. Torqued it down made sure it was happy then took a measurement of the gap. Now I know my bucket height and the gap to the cam. Add those two together and that’s what bucket your looking for is. Do the same for the other side. If one fits tight you have to find a smaller bucket and redo it all but you can take the measurements of the others. Once that’s done I took a price of paper and figured out what I had and what was in spec. This takes a while to make sure your not grinding the majority of them but well worth the struggle. Then see what your left with. Chances are you will have to order a couple but it’s better than all new. I happened to luck out and made it all work within spec. There were a couple that were close 🤫
Dude, did you measure the valve clearance after bolting the heads down? 100% will all be out and much tighter than when heads are on bench.
I double checked everything once the heads were installed. I had one that need to be taken out and redone but ants cause I used the lower end of spend and put it out a thousandth. So shoot for the middle of spec and you will be fine
can i do this same method with a shimmed bucket?
what part of the bucket is shimmed? I would assume that you would be able to. If it were me I would moddify/work on the shims. That way you are keeping the buckets the same thickness as its printed underneath
@@ModdingAddiction thanks brodie, i figured it out (:
Sorry for taking so long my computer has been broken and very in motivating. How did you end up doing it?
@@Dorganzola ended up staying with shimmed buckets. Measured the valve clearance, then measured how thick the shim was, then took what i needed off the valve clearance and subtracted it from the shim thickness to buy thinner shims.
You really should have used a proper micrometer. Only $35 @ harbor freight. The tolerance is only plus or minus .02 mm. So essentially your clearances are probably waaay off, which explains why you said they were tight. And these measurements should have been done after the heads were installed.
Your probably right on getting the right tool but this works just the same and it’s what I had on hand. The clearances are not waaaayyyy of however because the superseding measurement is between the bucket and the camshaft and uses the same tools and process as any builder would do. Having the heads torqued down might tweet the head a little bit but that’s not going to effect the cams that much. The head is held down then the cams are held onto the heads via the capsid as long as the caps are installed correctly that is what matters. Anyways the motor is running perfectly fine and has 20k+ on the rebuild
What qualifications do you have pertaining to this?
@@ModdingAddiction I agree with progolfer69 on his comment, I work in a machine shop making aerospace components and the tolerances are extremely tight ( within .0005) a vernier caliper is a quick way to check a large tolerance say plus or minus 5-10 thousandths (.005 - .010) a micrometer is a much more accurate way to measure this. That being said i know all about having to make due with what you have at hand and you have a good idea as far as setting them in the middle but remember this is setting when your valves open and close so you want as mch accuracy as you can get. Thank you for this video and the clear explanation of checking the actual cam/bucket clearance it will help me tomorrow before i drop my new motor in.
not really, a good caliper is plenty enough; .02 mm plus or minus, is in itself a bit *ridiculous* ; Renault on their 1.5 DCIs,for instance, i'm doing one right now, has is at .15 to .25 mm for intakes and .35 to .45 mm for exhausts; still with one exh aftermarket valve that i replaced, i have the clearance at .85 mm !! ; don't even know yet if they sell tappets thick enough to fix that,if not,the valve must SINK some more in the head,be it from grinding down the valve sealing area,or the valve seat in the head; this would be machine shop service,i am NOT equipped to do that,but i would tell them exactly how much to remove,of course.
What type of bit did you use to sand down the center?
I used a coarse sanding stone from a Dremel kit. They sell just the stones at most stores and used a drill press. I wouldn’t attempt it without one though. This way you have full control and the button gets an even grind. You have to do this to some buckets?
Modding Addiction yes I'll be doing the same thing with drill press
good luck and take your time. let me know how it goes
Grinding down a hardened surface to clearance valves is probably not a good idea
This whole video is just hard to watch. The biggest issue being that you are trying to use a digital caliper that doesn't even read in the accuracy that you're trying to achieve. I like the idea of grinding the buckets down with a drill press but it is not accurate enough so now the part of the bucket that opens the valve could have a slight angle to it which will cause the bucket to be loaded into its side on the head which will accelerate wear and could produce metal shavings in the engine. Not only that but the buckets need to be perfectly flat on the valve because the buckets are designed to spin in the bore and transfer the spin into the valve for better cooling. If the bucket isn't sitting perfectly flat on the valve it wont spin and your exhaust valves will burn.
Lastly, the valve clearance needs to be measured with the heads bolted on. They don't change much, but they do change.
Good points, I checked on the cost for new buckets for an altima $$$. So I found a good used head complete for much less. Figure I can switch out the few w/ tight clearances from this head. It has a slight miss on one cyl and checked it, sure enough couldn't get the. 012 feeler in there.
Dude buy new buckets and new cams when you buy a new heads.
The buckets are all the same diameter and there was no scaring on them. When Subaru shims their buckets they use the same method. Well a little more advanced with a cnc machine but same concept