got a new head

[Ryann]

Dual valve springs help ensure that the valve and lifter can follow an aggressive cam lobe at high RPMs. Maybe BMW realized that they over engineered the valve train and made changes with the e36 engines accordingly, or maybe they were just cutting corners to increase profits as they did with the m44, idk.

[timofeylbelarus]

thats what i was thinking, because i dont want my pistons to start hitting on the valves at 4500 rpm, but i guess ill just go with this head maybe ill build another engine by the time ill be done with this one lol

[timofeylbelarus]

so i finally got everything together but it doesnt start one cylinder fires tho, how long does it take for the hydralic valve adjusters to adjust? or what could i do to help them adjust faster?

[bernzpeed]

i had just overhauled my M42 and she fired up today. head had a crack and luckily I found a replacement with the same casting #. she ran really good while I was parked. unfortunately, when i took her for a test drive, it stalled after a mile. I thought I ran out of gas or the battery was too weak. It turns out the camshaft broke in half. All that hardwork... anyways, I'm waiting on another camshaft (exhaust side) then button her up again.

It took me awhile to get the car running. I cranked several times it until it started.

[thebutterson]

I couldn't tell you about 4cyl motors for sure, but on the sixes BMW went back to single valve springs. I pulled an m50nv head to use as a replacement for my s52 and it had the larger stemed valves and dual springs where the s52 had the smaller stemed valves and single springs. I would consider it a small upgrade if I were you. Another note is that Metric Mechanic uses single valve springs in their performance heads, so I think it's more about which spring you use than single vs double.

[timofeylbelarus]

I already got all of the valve and spring stuff figured out, the proble is that when I put the head together the first cylinder valves were sticking out a little although the rockers were pointing up, same most other valves, this would make the cylinder not fire cuz it doesnt have compression, my question is, do I have to just keep cranking it them to adjust or what?

[bernzpeed]

I believe your camshaft is not on tdc. The first one is not supposed to point up, the tip should point to 10 o clock (intake) and the exhaust camshaft point to 2 o clock. So basically, exhaust and intake camshaft are almost facing each other. This is when the valves are raised up. And it doesn't hit the piston.

Sent from my HERO200 using Tapatalk

[timofeylbelarus]

No my timing is correct, I just meant that the cam was at the position where the valves should be completely closed, you know what I mean?

[bernzpeed]

Your valves are too long then perhaps.

Sent from my HERO200 using Tapatalk

[timofeylbelarus]

Yeah but shouldnt the valve lifters adjust to that?

[bernzpeed]

i had to buy new valves for the new head i got because the old valves were too long for the springs on the new one. despite the same casting no. it had different springs and valve sizes. only a machine shop can tell you that if you are not knowledgeable in how that works.

[timofeylbelarus]

lol i got the car started and it ran good but now there is a fat ass oil leak from under the head, what the heck did i do wrong now

[bwawuz02]

be more specific about your leak, it could be a few different things. post #400 :pimp:

[timofeylbelarus]

Its along the whole exhaust side of the head, the head is all clean and dry but the block right under the head gasket, I think I should of just resurfaced the head before I put it on, so I just messed up and didnt have patience lol, oh well here it comes apart again for the tenth time haha

[timofeylbelarus]

whats the difference between the e36 cams and e30 cams anybody knows?