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Post by mitchy965 on Apr 20, 2020 10:39:41 GMT -8
is the lash cap a tight fit on the valve or does it just float on the end of the stem? the lash cap can only touch the valve stem,if it touches the retainer or the keepers= big trouble. watch those thick ones. whats the surface like on the rocker where it contacts the stem on the affected rocker? is it possible that cap missed the heat treat?
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Post by mitchy965 on Apr 20, 2020 10:50:51 GMT -8
what cam did you select? is it compatible with 1:25 and 1:4 ratios?
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Post by Rob Sannes on Apr 20, 2020 11:25:37 GMT -8
is the lash cap a tight fit on the valve or does it just float on the end of the stem? the lash cap can only touch the valve stem,if it touches the retainer or the keepers= big trouble. watch those thick ones. whats the surface like on the rocker where it contacts the stem on the affected rocker? is it possible that cap missed the heat treat? The Autocraft caps were tight, real tight. The thicker caps are snug but don't need a puller to remove. Lots of clearance between retainer and keeper. The auto craft rocker has shiny pads but otherwise look ok. I am thinking back to when I was doing the mockup. I think I screwed up the caps when installing them. I used a pencile butane torch to just warm them up to expand them a bit, they were so tight getting them on, I probobly killed the heat treat on them. I was definatly trying to not turn them blue or anything but I won't be using that method ever again. Hindsight is 20/20 and stupid can be exspensive. The cam is a FK-8.
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Post by mitchy965 on Apr 20, 2020 12:11:23 GMT -8
the tighter the cap to valve fit the better(they are a pain in the ass to deal with).i dont know if you can generate enough heat with butane to spoil the heat treat on a cap but than anything is possible.if the rocker looks good i would suggest the cap is the issue.is the rocker offset to the valve centerline slightly?the offset is to promote valve rotation and thats why the cap should fit tight to the valve otherwise the cap rotates instead of the valve.ive never run a fk8 without 1:4 rockers but i would expect you would leave a lot on table by going to 1:25s.
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Post by Rob Sannes on Apr 20, 2020 13:12:14 GMT -8
The scat rockers are 1.4 getting .542 lift at the valve so nothing will be left on the table that way. I did keep in mind and set the offset when I was doing mockup with the autocraft rockers. The scat rockers are good also. I will be putting it back on the stand for another test run this week fingers crossed.
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Post by mitchy965 on Apr 20, 2020 13:14:28 GMT -8
sorry i thought the scats were 1:25s
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Post by Rob Sannes on Apr 20, 2020 14:03:27 GMT -8
sorry i thought the scats were 1:25s No worries I mentioned before in a eaier post that I have a set of the 1.25s that I am using on the 1776 build Im doing next. The scat 1.4 rockers were reluctantly donated by my 2332. I may buy a set of Berg rockers for that one when the time comes. Who would you buy your lash caps from? Aircooled.net lists some caps but calls it a "snug fitting cap" thats how I would describe the scat ones I have on now. Are CB caps good? Berg doesn't have any avalable unless you buy rocker arms. Thanks Mitchy your input is always appreciated!
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Post by mitchy965 on Apr 20, 2020 14:46:41 GMT -8
problem is every manufacturer of valves and every manufacturer of lash caps has a different idea of snug. they should fit tightly but what will fit what is anybodies guess. bergs are the only ones that fit....their valves.
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Post by PICTUP on Apr 20, 2020 18:13:29 GMT -8
Starting to sound rather proprietary....
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Post by Rob Sannes on Apr 26, 2020 10:01:39 GMT -8
Sad weekend for my motor project. As I posted before I have been having problems with my rocker arms. Now a 2nd set of wasted lash caps and rockers. I bolted it up checked geometry felt like it looked good. I then fired it up ran it for about 10 minutes on the stand mostly at about 1250 rpm. I gave couple of raps to see if it sounded good and It did. I let it cool down and I wanted to recheck lash and when I was the feeler gauge came out with a black paste. So I pulled them off and found this I'm having a oil starvation proplem at low rpm at very least. The springs did not look wet with oil. The pushrods, cups, shafts bushings all well oiled. So the springs valve stems and rocker ends are dry. I have a good amount of oil pressure in this motor. I know gauges can be off a bit but it shows 50lbs cold at Idle and 80lbs at higher RPM. So what to do now is my question. I thought I was so close to installing my motor. Now feeling pretty defeated. One thought is to drill a jet hole like a corvair pushrod?? I also now have to find another set of 1.4 rocker arms. But everone seems to be out of stock right now too, except for Empi 1.4 rockers. I bought a set a year ago but returned them because of obvious poor quality. So any input, Ideas, or advice at this point would be appreciated. Thanks Everyone.
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Post by owdlvr on Apr 26, 2020 10:50:23 GMT -8
Burned up the first set of rockers on my Rally Bug motor due to the same issue. We figured it was somehow dry-sump related, but that doesn't really make sense. The solution was to drill a tiny hole in the side of the pushrod near the end, so it sprays oil as it spins. I can't recall the hole size, or exact location (I do know it's only on two of the four in each head) but as I have to do that to a new set in the coming weeks, I can get the details and post them up for you.
No help on the 1.4 rocker arms, wonder if CB has anything?
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Post by mitchy965 on Apr 26, 2020 12:24:23 GMT -8
just asking here..what are you using for oil?
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Post by Rob Sannes on Apr 26, 2020 12:32:27 GMT -8
just asking here..what are you using for oil? Lucas "hotrod oil for flat tappet cams"
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Post by Volktales on Apr 28, 2020 19:31:24 GMT -8
Hey, that's the same oil I'm using in the Terseo! You know that car that I have only driven once so far...
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Post by CrazyBrit on Apr 29, 2020 9:38:12 GMT -8
No one is going to blame you for wanting to drive your VWs instead!
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